View TS7001IM8_9047491.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

ts7001 page 1 ? 2014 silicon laboratories, inc. all rights reserved. features ? pin-for-pin, 1.5x faster upgrade to ad7887 ? single-supply operation: +2.7v to +3.6v ? inl: 1lsb ? one or two single-ended analog inputs ? internal wide-bandwidth track-and-hold ? integrated +2.5-v reference ? flexible power/throughput-rate management 0.85ma at 187.5ksps (internal vref on) 0.7ma at 187.5ksps (internal vref off) ? shutdown-mode supply current: 1 a (max) ? spi?/qspi?/microwire?/dsp-compatible serial interfaces 1 ? operating temperature range: -40oc to +85oc ? 8-pin msop packaging applications instrumentation and control systems high-speed modems battery-powered systems: personal digital assistants, medical instruments, mobile communications 1 spi and qspi are trademarks of motorola, inc. microwire is a trademark of national semiconductor corporation description the ts7001 ? a pin-for-pin, 1.5x faster alternate to the ad7887 - is a self-contained, 2-channel, high- speed, micropower, 12-bit analog-to-digital converter (adc) that operates from a single +2.7v to +3.6v power supply. the ts7001 is capable of a 187.5-ksps throughput rate with an external 3 mhz serial clock and draws 0.85ma supply current. the wideband input track-and-hold acquires signals in 500ns and features a single-ended sampling topology. output data coding is straight binary and the adc is capable of co nverting full power signals up to 10 mhz. the adc also contains an integrated 2.5v reference or the vref pin can be overdriven by an external reference. the ts7001?s provides one or two analog inputs each with an analog input range from 0 to v ref . in two-channel operation, the analog input range is 0v to vdd. efficient circuit design ensures low power consumption of 2mw (typical) for normal operation and 3 w in power-down operation. the ts7001 is fully specified from -40oc to +85oc and is available in 8-pin msop package. a micro p ower , 2-channel , 187.5-ks p s , serial-out p ut 12-bit sar a dc functional block diagram
ts7001 page 2 ts7001 rev. 1.0 absolute maximum ratings v dd to agnd ................................................................ ? 0.3v to +7v analog input voltage (ain0, ain1) to agnd .... ? 0.3v to v dd + 0.3v digital input voltage to agnd........................... ? 0.3v to v dd + 0.3v digital output voltage to agnd ........................ ? 0.3v to v dd + 0.3v refin/refout to agnd ................................ ? 0.3v to v dd + 0.3v input current to any pin except supplies 1 ............................. 10ma operating temperature range .............................. ? 40c to +125c storage temperature range ................................. ? 65c to +150c junction temperature ........................................................... +150c msop package power dissipation ....................................... 450mw ja thermal impedance .............................................. 205.9c/w jc thermal impedance .............................................. 43.74c/w lead temperature, soldering vapor phase (60 sec) ........................................................ 215c infrared (15 sec) ................................................................ 220c pb-free temperature, soldering reflow ............................. 260(0)c esd ............................................................................................. 4kv electrical and thermal stresses beyond those listed under ?absolute maximum ratings? ma y cause permanent damage to the device. these are stress ratings only and functional operation of the device at these or any other condition beyond those indicated in the op erational sections of the specifications is not implied. ex posure to any absolute maximum rating conditions for extended periods may affect device reliability and lifetime. package/ordering information order number part marking carrier quantity TS7001IM8 tadf tube 50 TS7001IM8t tape & reel 2500 lead-free program: silicon labs supplies only lead-free packaging. consult silicon labs for produ cts specified with wider oper ating temperature ranges.
ts7001 ts7001 rev. 1.0 page 3 electrical characteristics v dd = +2.7v to +3.6v; v ref = 2.5v external/internal reference unless otherwise noted; f sclk = 3 mhz; t a = t min to t max , unless otherwise noted. parameter limit 1 unit test conditions/comments dynamic performance signal to noise + distortion ratio (snr) 2 71 db (typ) f in = 10 khz sine wave, f sample = 187.5ksps total harmonic distortion (thd) ? 80 db (typ) f in = 10 khz sine wave, f sample = 187.5ksps peak harmonic or spurious noise ? 80 db (typ) f in = 10 khz sine wave, f sample = 187.5ksps intermodulation distortion (imd) second-order terms ? 80 db (typ) f1 = 9.983 khz, f2 = 10.05 khz, f sample = 187.5ksps third-order terms ? 80 db (typ) f1 = 9.983 khz, f2 = 10.05 khz, f sample = 187.5ksps channel-to-channel isolation ? 80 db (typ) f in = 25 khz full-power bandwidth 10 mhz (typ) measured at 3 db down dc accuracy(any channel) resolution 12 bits integral nonlinearity 1 lsb (max) vdd = 3v differential nonlinearity 1 lsb (max) vdd = 3v; guarant eed no missing codes to 11 bits offset error 4 lsb (max) vdd = 3v, dual-channel mode 6 lsb (typ) single-channel mode offset error match 0.5 lsb (max) gain error 2 lsb (typ) dual-channel mode 1 lsb (max) single-channel mode, external reference 6 lsb (typ) single-channel mode, internal reference gain error match 2 lsb (max) analog input input voltage range 0 to vref v single-channel operation 0 to vdd v dual-channel operation leakage current 5 a (max) input capacitance 10 pf (typ) reference input/output refin input voltage range 2.5/vdd v (min/max) single-channel/dual-channel; functional from 1.2v input impedance 10 k ? (typ) very high impedance if in ternal reference is disabled refout output voltage 2.488/2.513 v (min/max) initial accuracy = 0.5% refout temperature coefficient 30 ppm/c (typ) logic inputs input high voltage, v inh 2.1 v (min) vdd = 2.7v to 3.6v input low voltage, v inl 0.8 v (max) vdd = 2.7v to 3.6v input current, i in 1 a (max) typically 10na, v in = 0v or vdd input capacitance, c in 3 10 pf (max) logic outputs output high voltage, v oh v dd ? 0.5 v (min) v dd = 2.7v to 3.6v, i source = 200 a output low voltage, v ol 0.4 v (max) i sink = 200 a floating-state leakage current 1 a (max) floating-state output capacitance 4 10 pf (max) output coding straight (natural) binary conversion rate throughput time 16 sclk cycles conversion time plus acqui sition time is 187.5ksps, with 3 mhz clock track-and-hold acquisition time 1.5 sclk cycles conversion time 14.5 sclk cycles 4.833 s (3 mhz clock)
ts7001 page 4 ts7001 rev. 1.0 electrical specifications (continued) v dd = +2.7v to +3.6v; v ref = 2.5v external/internal reference unless otherwise noted; f sclk = 3 mhz; t a = t min to t max , unless otherwise noted. parameter limit 1 unit test conditions/comments power requirements vdd +2.7/+3.6 v (min/max) idd normal mode 4 (pm mode 2) static 0.6 ma (max) operational (f sample = 187.5 ksps) 0.85 ma (typ) internal reference enabled 0.7 ma (typ) internal reference disabled using standby mode (pm mode 4) 0.45 ma (typ) f sample = 50 ksps using shutdown mode (pm modes 1 and 3) 0.12 ma (typ) f sample = 10 ksps 0.012 ma (typ) f sample = 1 ksps standby mode 5 0.21 ma (max) vdd = 2.7v to 3.6v shutdown mode 5 1 a (max) vdd = 2.7v to 3.6v normal mode power dissipation 2.1 mw (max) vdd = 3 v shutdown power dissipation 3 w (max) vdd = 3 v standby power dissipation 0.63 mw (max) vdd = 3 v note 1: the ts7001?s temperature range is ?40 c to +85 c. note 2 : snr calculation includes distortion and noise components. note 3: sample tested at t a = 25 c to ensure compliance. note 4: all digital inputs at gnd except for cs at v dd . all digital outputs are unloaded. a nalog inputs are connected to gnd. note 5: sclk is at gnd when sclk is off. all digital inputs are at gnd except for cs at vdd. all digital outputs are unloaded. analog inputs are connected to gnd.
ts7001 ts7001 rev. 1.0 page 5 timing specifications 1 v dd = +2.7v to +3.6v; t a = t min to t max , unless otherwise noted. parameter limit unit description f sclk 2 3 mhz (max) external serial clock t convert 14.5 t sclk conversion time t acq 1.5 t sclk throughput time = t convert + t acq = 16 t sclk t 1 10 ns (min) cs to sclk setup time t 2 3 60 ns (max) delay from cs until dout three-state disabled t 3 3 100 ns (max) data access time after sclk high-to-low edge t 4 20 ns (min) data setup time prior to sclk low-to-high edge t 5 20 ns (min) data valid to sclk hold time t 6 0.4 t sclk ns (min) sclk high pulse width t 7 0.4 t sclk ns (min) sclk low pulse width t 8 4 80 ns (max) cs rising edge to dout high-z t 9 5 s (typ) power-up time from shutdown note 1: timing specifications are sample tested at 25c to ensure comp liance. all input signals are specified with tr = tf = 5 ns (10% to 90% of vdd) and timed relative to a voltage level of 1.6v. note 2: the mark/space ratio for the sclk input is 40/60 to 60/40. see serial interface se ction for additional details. note 3: measured with the load circui t as shown below and defined as the time required for the output to cross 0.8v or 2.0v. note 4: timing specification t 8 is derived from the measured time taken by the data out puts to change 0.5v when loaded with the circuit shown below. the measured result is then extrapolated back to remove the effects of charging or discharging the 50pf capacitor. this means that the time, t 8 , quoted in the timing characteristics is the true bus relinquish time of the ts7001 and is independent of bus loading. load circuit used for ts7001? s digital output timing specifications.
ts7001 page 6 ts7001 rev. 1.0 power supply rejection vs frequency power supply rejection - db -97 -93 -89 -85 -77 frequency - khz -81 2.7 30 45 60 15 75 90 vdd = 2.7v/3.6v refin (external) = 2.488v 100mvpp sine wave on vdd vdd = 3v refin ( external ) = 3v signal-to-noise ratio vs frequency signal-to-noise ratio - db 70 70.5 71 72 71.5 0.7 45 60.2 90 15.5 frequency - khz dynamic performance vs frequency fft results - db -140 -100 -80 -60 -40 0 frequency - khz -20 0 20 40 60 -120 80 4096-point fft 187.5ksps sampling rate 10khz fundamental 75 30.5 integral nonlinearity inl - lsb digital output code -0.6 -0.2 0.2 1k 2k 0 3k 4k 0.6 1 differential nonlinearity dnl - lsb digital output code 1k 2k 0 3k 4k -1 -0.6 -0.2 1 0.2 0.6 temperature - oc -15 35 60 85 10 0.8 0 0.4 offset error - lsb offset error vs temperature -40 1.6 1.2 typical performance characteristics v dd = +3v ; f sclk = 3mhz ; t a = 25oc , unless otherwise noted. -1
ts7001 page 7 ts7001 rev. 1.0 1.2 0.8 gain error vs temperature temperature - oc -15 35 60 85 10 gain error - lsb -40 0.4 0 -0.4 internal reference output vs supply voltage reference output - v 2.494 2.496 2.498 2.500 2.502 power supply voltage - volt 2.7 3.15 3.38 2.93 3.6 temperature - oc -15 35 60 85 10 -40 internal reference output vs temperature reference output - v 2.495 2.497 2.499 2.501 2.505 2.503 power supply current vs power supply voltage supply curent - ma 0.6 0.5 0.4 0.1 power supply voltage - volt 2.7 3.15 3.38 2.93 3.6 0.3 code = 1111 1111 1111 converting sclk = 3mhz static 0.2 power supply current vs temperature temperature - oc -15 35 60 85 10 -40 0.55 0.50 0.40 0.10 0.35 0.15 supply curent - ma static, v dd = 3v converting, v dd = 3v 0.45 0.30 0.20 0.25 typical performance characteristics v dd = +3v ; f sclk = 3mhz ; t a = 25oc , unless otherwise noted.
ts7001 page 8 ts7001 rev. 1.0 pin functions pin label description 1 cs chip select: as an active low logic input signal, the cs input provides the dual function of initiating ts7001 conversions as well as framing the serial data transfer. when the ts7001 is operated in mode 1(its default power management mode), the cs pin also acts as the shutdown pin in that the ts7001 is powered-down when the cs pin is logic high. 2 vdd power supply voltage: the ts7001?s v dd range +2.7v to +3.6v. in two-channel operation, the vdd pin also serves as the ts7001?s volt age reference source during conversions. for optimal performance, the vdd pin should be bypassed to gnd with a 10-f tantalum capacitor in paralle l with a 0.1f ceramic capacitor. 3 gnd analog ground pin: the gnd pin is the ground reference point for all ts7001 internal circuitry. in systems with separate ag nd and dgnd planes, the ts7001?s gnd pin should be connected to the agnd plane. 4 ain1/vref analog input channel 1/external vref input: in single-channel mode, the ain1/vref pin is configured as vrefin/out. in this mode, the ts7001?s internal 2.5v reference can be accessed or an external reference can be applied to this pin thereby overriding the internal reference. the reference voltage range for an ex ternally-applied reference is 1.2v to vdd. in two-channel mode, the ain1/vref pin operat es as a second analog input channel, ain1. the input voltage range on ain1 is 0 to vdd. 5 ain0 analog input channel 0: in single-channel oper ation, ain0 is the ts7001?s analog input with an input voltage range of 0v to vref. in two-channel operation, the ain0 pin exhibits an analog input range of 0v to vdd. 6 din serial data input: serial data to be loaded into the ts7001?s control register is applied at the din pin. serial data is loaded into the adc from the host processor on low-to-high sclk transitions (see the control register se ction for additional information). configuring the ts7001 as a single-channel, read-only adc can be achieved by hard-wiring the din pin to gnd or by applying a logic low at all times at the din pin. 7 dout serial data output: the ts7001?s conversion result is available on this pin. serial data is transferred out of the ts7887 on high-to low transitions of sclk. the 12-bit conversion result is comprised of four leading zeros followed by the 12 bits of conversion data formatted msb first. thus, a total of 16 sc lk high-to-low transitions transfers the conversion result to the host processor as shown in the corresponding timing diagram of figure 14. 8 sclk serial-clock input: sclk is used for (3) purposes: a) to load serial data from the host processor into the ts7001?s control register on low-to-high sclk transitions; b) to transfer the 12-bit conversion result to the host proc essor on high-to-low sclk transitions; and c) to control the ts7001?s conversion process.
ts7001 ts7001 rev. 1.0 page 9 ts7001 control register description the ts7001?s write-only cont rol register is 8-bits wide. serial adc configuration data is uploaded from the host processor at the ts7001?s din pin on low-to-high sclk transitions. serial input data is uploaded to the ts7001 simultaneously as the conversion result is transferred out of the ts7001. all serial data transfers require 16 serial clocks transitions. after a high-to-low cs transition signal , serial data available on the first eight low-to-high sclk transitions is transferred into the control register. the first bit in the serial data stream is always interpreted as the msb. upon initial power- up, the ts7001?s default control register bit is cleared to all zeros (all ?0?s). table 1 lists the functions of the control register?s 8 bits. table 1. ts7001?s 8-bit control register content description db7 (msb) db6 db5 db4 db3 db2 db1 db0 (lsb) dontc zero ref sin/dual ch zero pm1 pm0 dbx label comment 7 dontc control register db7: bit status of db7 is ?don?t care.? in other words, the db7 bit can be a ?0? or a ?1?. 6 zero control register db6: to ensure correct ts7887 operation, control register db6 status must always be a ?zero? (?0?). 5 ref control register db5 ? internal voltage reference configuration: the status of db5 determines whether the ts7001?s internal voltage reference is enabled or disabled. a ?0? in the db5 location will enable the ts7001?s internal voltage reference (default condition). to disable the ts7001?s internal voltage refe rence, a ?1? must be written into db5?s register location. 4 sin/dual control register db4 - single-channel/dual -channel configuration. control register db4 configures the ts7001 as a single-channel or two-channel adc. loadi ng a ?zero? (?0?) into this register location configures the ts7001 for single-channel operation with the ain1/vref pin configured to for internal vref operation (default configuration). in this case, the analog input signal range is 0v to vref. loading a ?one? (?1?) into this register location configures the ts7001 for two-channel operation with the ain1/vref pin conf igured to its ain1 function as the second analog input. in addition, the conversion process?s refe rence voltage is internally connected to vdd. in this case, the analog input signal range is 0v to vdd. to obtain best performance from the ts7001 in two-channel operation, the adc?s internal reference should be disabled; t hat is, a ?1? should be loaded into db5?s register location. 3 ch control register db3 - channel select bit: the bit st atus of db3 determines on which channel the ts7001 is converting. when the adc is confi gured for dual-channel operation, db3 deter mines which channel is converted on the next conversion cycle. when db3 is a ?zero? (a ?0?), the ain0 input is selected and, when db3 is a ?one? (a ?1?), the ain1 input is selected. db3 should be a ?zero? (?0 ?) when the ts7001 is configured for single-channel operation. 2 zero control register db2: to ensure correct ts7887 operation, control register db2 status must always be a ?zero? (?0?). 1 pm1 control register db1 and db0 - power management oper ating modes: db1 and db0 are decoded to configure the ts7001 into one of four operating modes as shown in table 2. 0 pm0 table 2. ts7001?s power management operating modes pm1 pm0 mode 0 0 pm mode 1: in this operating mode, the ts7001?s power-down mode is enabled if its cs input is a ?one? ( a ?1?) and is operating in full-power mode when its cs input is a ?zero? (a ?0?). thus, the ts7001 is powered down on a low-to-high cs transition and is powered up on a high-to-low cs transition. 0 1 pm mode 2: in this operating mode and regardless of the status of any of the logic inputs, the ts7001 is always fully powered up. 1 0 pm mode 3: in this operating mode, the ts7001 is automatically powered down at the end of each conversion regardless of the state of the cs input. adc wake-up time from full shutdown is 5 s and system design should ensure that at least 5 s have elapsed before attempting to perform a conversion in this mode; otherwise, an invalid conversion result may occur. 1 1 pm mode 4: in this operating mode, the ts7001 is configured for standby operation after conversion. sections of the ts7001 are powered down; however, the internal 2.5-v re ference voltage remains powered up. while pm mode 4 is similar to pm mode 3, pm mode 4 operation allows the ts7001 to power up much faster. for optimal performance, the control register?s ref bit (db5) shoul d be a ?zero? (?0?) to ensure the inte rnal reference is enabled/remains enabled.
ts7001 page 10 ts7001 rev. 1.0 description of operation the ts7001 is a singl e-supply, low-power, single/dual-channel, 12-bit successive- approximation adc with an easy-to-use serial interface. the adc can be operated from a 3v supply (2.7v to 3.6v). when operated from either a 3v, the ts7001 can operate at throughput rates up to 187.5ksps when an external 3 mhz clock is applied. in a 8-pin msop package, the ts7001 integrates a 2.5-v reference, a hi gh-speed track/hold, a successive-approximation a dc, and a serial digital interface. an external serial clock is used to transfer data to/from the adc and controls the ts7001?s conversion process. the ts7001 can be configured for single- or two-channel operation. when configured as a single- channel adc, the analog input range is 0 to vref (where an externally applied vref, if used, can range between 1.2 v and vdd). when the ts7001 is configured for two- channel applications, the analog input range on each channel is set internally from 0v to vdd. if the ts7001 is configured for single-channel operation, the ts7001 can be operated in a read- only mode by applying a logic low at all times to the din pin (pin 6) or by hard-wiring the din pin permanently to gnd. for maximum flexibility to address multiple configurations based on the application, the din input can be used to load adc configuration data from a host processor into the ts7001?s 8-bit control register. ts7001 operation and transfer function the ts7001 is a successive-approximation adc, the core of which is a charge-redistribution dac. figure 1 illustrates an equivalent circuit for the ts7001 in signal acquisition phase. here, switch sw1 is in position a and switch sw2 is closed. with the sampling capacitor?s terminals connected to the analog input on one side and re f on the other, the analog signal is acquired. during the acquisition phase, the inputs to the comparator are balanced since both inputs are connected to ref. during the conversion phase as shown in the equivalent circuit in figure 2, switch sw1 is moved from position a to gnd at position b and switch sw2 is opened. at this point in time, the inputs to the comparator become unbalanced. the ts7001?s control logic and the charge- redistribution dac work together to add or subtract fixed packets of charge from the sampling capacitor to balance once again the comparator input terminals. at the time when the comparator is rebalanced, the conversion process is complete and the adc?s c ontrol logic generates the adc serial output conversion data. figure 3 illustrates the ideal transfer function for the ts7001 where the output data is coded straight binary. thus, the designed code transitions occur at successive integer lsb values (that is, at 1 lsb, at 2 lsbs, etc) where the lsb size is vref/4096. figure 1: ts7001?s acquisition phas e equivalent circuit figure 2 : ts7001?s conversion phase equivalent circuit figure 3: ts7001?s unipolar transfer function for straight binary digital data.
ts7001 ts7001 rev. 1.0 page 11 typical application circuit figure 4 shows a typical application circuit for the ts7001 where the adc?s gn d pin is connected to the analog ground plane of the system. in this application circuit, the ts7001 has been configured for two-channel operation so the adc?s vref is internally connected to vdd; as a result, the analog input range on either analog input is 0v to vdd. it is always considered good engineering practice to bypass the adc?s vdd with good quality capacitors with short leads (surface-mount components are preferred) and located a ve ry short distance from the adc. the conversion result at the dout pin is a 16- bit word with four leading zeros followed by the msb of the 12-bit conversion result. in low-power applications, automatic- power-down-at-the-end-of- conversion modes (pm modes 3 or 4) should be used to improve the ad c?s power consumption- versus-throughput rate performance. for additional information on the ts7001?s four power management operating modes, please consult the operating modes section of the datasheet. analog input details an equivalent circuit of t he analog input structure of the ts7001 is illustrated in figure 5 where diodes d1 and d2 serve as esd-clamp protection for the analog inputs. since there are diodes from the analog input to both vdd and gnd, it is important any forward conduction of current in d1 or d2 is avoided. thus, the analog input signal should never exceed the either vdd or gnd by more than 200mv. even though the maximum current these diodes can conduct without causing irreversible damage to the adc is 20ma, any small amount of forward diode current into the substrate because of an overvoltage condition on an unselected channel can cause inaccurate c onversion results on the selected channel. attributed to parasitic package pin capacitance, capacitor c1 in figure 5 is typically about 1 pf. resistor r1 is the equivalent series resistance of the ts7001?s input multiplexer and input sampling switch and is approximately 100 ? . capacitor c2 is the adc sampling capacitor and has a typical capacitance of 10 pf. in signal-acquisition (or ac) applications, the use of an external r-c low-pass filter on either or both analog inputs can be useful in removing out-of-band high-frequency components from the analog input signal. in applications where harmonic distortion and signal-to-noise ratio performance are important, the analog input(s) should be driven from a low- impedance source. large source impedances will affect significantly the ts7001?s ac performance. to lower the driving-point impedance level, it may be necessary to use an input buffer amplifier. the optimal choice for the exte rnal drive op amp will be determined by application requirements as well as the ts7001?s dynamic performance. when the analog input is not driven by an external amplifier, the driving-point source impedance should be low. the maximum source impedance will depend upon the amount of total harmonic distortion (thd) that can be tolerated in the application. thd will increase as the sour ce impedance increases figure 4: ts7001's typical application circuit. figure 5: ts7001?s analog input equivalent circuit. input frequency - khz total harmonic distortion - dbc vdd = 3v 3v ext vref -65 -75 -85 -90 0.2 10 50 90 40 -60 figure 6: ts7001 thd vs analog input frequency rin = 50 ? ? cin = 2.2nf rin = 10 ? ? cin = 10nf -70 -80 80 20 30 60 70
ts7001 page 12 ts7001 rev. 1.0 and performance will degrad e. figure 6 illustrates how the ts7001?s harmonic performance as a function of frequency is af fected by different source impedances. the ts7001?s internal 2.5-v reference using the ref bit (the db5 bit) in the ts7001?s control register, the ts7001?s internal 2.5-v reference can be enabled (db5 cleared to ?0?) or disabled (db5 set to ?1?). if enabled (the default condition), the internal voltage reference can be used in applications for other purposes and, if this is desired, the reference should be buffered by an external, precision op amp. if an external, precision voltage reference is used instead of the ts7001?s internal reference, the internal reference is automatically overdriven. in this case, the ts7001?s internal reference should be disabled by setting the ref bit in the control register. when the internal reference is disabled, switch sw1 as shown in figure 7 opens and the input impedance seen at the ain1/vref pin is the reference buffer?s input impedance, approximately in the gigaohm range (g ? ). when the internal reference is enabled, the input impedance at the ain1/vref pin is typically 10k ? . when the ts7001 is configured for two- channel operation, the ts7001?s reference is set internally to vdd. ts7001?s power-down operating modes the ts7001 provides flexible power management to allow the user to achieve the best power performance for a given throughput rate. the four power management options are selected by programming the ts7001?s power management bits (?pm? bits pm1 and pm0) in the control register as summarized in table 6. when the pm bits are programmed for either of the auto power-down modes (pm mode 3 or 4), the ts7001 is powered- down on the 16th low-to-high sclk transition after a high-to-low cs transition. the first high-to-low sclk transition after a high-to-low cs transition powers- up the ts7001 again. when the ts7001 is programmed in pm mode 1 (i.e., [pm1,pm0] = [0,0], the default condition), the ts7001 is powered down on a low-to-high cs transition and powers up from shutdown on a high-to-low cs transition. if the cs pin is toggled low-to-high during the conversion in this operating mode, the adc is immediately powered down. cold-start and standby power-up delay times when vdd is first applied to the ts7001 (in other words, from cold start-up), the adc powers up in pm mode 1 ([pm1,pm0] = [0,0]). upon a subsequent high-to-low cs transition, the ts7001?s power-up delay time is approximately 5 s. when using an external voltage reference in single-channel operation or when the ts7001 is powered up from standby mode (pm mode 4), its power-up delay time is approximately 1 s because the internal reference has been either disabled (refer to control register db5) or the internal reference has remained powered up (via pm mode 4). since the ts7001?s power-up delay time pm mode 4 is very short, powering up the adc and executing a conversion with valid results in the same read/write operation is feasible. ts7001 power consumption vs. throughput rate considerations in operating the ts7001 in auto-shutdown mode (pm mode 3), in auto-standby mode (pm mode 4), or in pm mode 1, the average power drawn by the ts7001 decreases at lower throughput rates. as shown in figure 8, the average power drawn from figure 7: ts7001?s integrated 2.5-v vref circuitry. throughput rate - ksps power consumption - mw 1 0.1 0.01 0 40 100 180 60 10 figure 8: ts7001 power consumption vs throughput rate vdd = 3v sclk = 3mhz 140 120 80 20 160
ts7001 ts7001 rev. 1.0 page 13 the supplies by the adc is commensurately reduced the longer the ts7001 remains in a powered-down state. for example, consider the following ts7001 application configuration: (a) the adc is powered from vdd = 3v and is configured for pm mode 3 (that is, [pm1, pm0] = [1,0], where the adc?s internal reference is enabled and the adc automatically powers down after the conversion is completed); and (b) the adc operates at a throughput rate of 10 ksps with a 3-mhz sclk. given the above configurat ion, the ts7001?s power consumption during normal operation is 2.1mw at vdd = 3 v (0.7ma x 3v). since its power-up delay time is 5 s and its conversion-plus-acquisition time is ~5.2 s (t convert + t acq = 14.5 x t sclk + 1.5 x t sclk = 15.5 x t sclk ), the ts7001 consumes 3.5mw for 10.2 s during each conversion cycle. since the conversion cycle time (100 s) is the reciprocal of the adc?s throughput rate (10ksps), the average power consumed by the ts7001 during each conversion cycle is (10.2/100) (2.1mw), or 214.2 w. the ts7001?s power consumption vs. throughput rate when configured for automatic shutdown post conversion and operating on a 3v supply is illustrated in figure 8. power management operating modes designed to provide flexible power consumption profiles, the ts7001 incorporates four different operating modes to optimize the adc?s power consumption/throughput-rate ratio. as previously described in table 6, the four different modes of operation in the ts7001 ar e controlled by the pm1 and pm0 bits of the control register. also mentioned previously, the ts7001 can be configured as a read-only adc by forcing an all zeros (?0?s) condition in the control register. this can be easily done by applying a logic low at all times to the din pin or hard-wiri ng the din pin directly to gnd. power management mode 1 operation: [pm1,pm0] = [0,0] power management operating mode 1 is used to control the ts7001?s power-down using the cs pin. whenever the cs pin is low, the ts7001 is fully powered up; whenever the cs pin is high, the ts7001 is completely powered down. when the cs pin is toggled high-to-low, a ll internal circuitry starts to power up where it can take as long as 5 s for the ts7001?s internal circuitry to power up completely. as a result, any conversion start sequence should not be initiated during this initial 5 s power-up delay. figure 9 shows a general operating diagram of the ts7001 in pm mode 1. the analog input signal is sampled on the second low-to-high sclk transition following the initial high-to-low cs transition. system timing design should incorporate a 5- s delay between the high-to-low cs transition and the second low-to-high sclk transition. in microcontroller applications, this is achieved by figure 9: ts7001?s power management mode 1 operation diagram.
ts7001 page 14 ts7001 rev. 1.0 driving the cs pin from one of the host processor?s port lines and ensuring that the serial data read (from the microcontroller?s serial port) is not initiated for at least 5 s. in dsp applications, where the cs signal is derived typically from the dsp?s serial frame synchronization port, it is usually not possible to separate a high-to- low cs transition and a second low-to-high sclk transition by up to 5 s without affecting the dsp system serial clock speed. therefore, system timing design should incorporate a write to the ts7001?s control register to terminate pm mode 1 operation and program the adc into pm mode 2; that is, by writing [pm1,pm0] = [0,1] into the ts7001?s control register. to get a valid conversion result, a second conversion must be initiated when the adc is powered up. a write operation that takes place with this second conversion can program the adc back into pm mode 1 where the power-down operation is enabled when the cs pin is toggled high power management mode 2 operation: [pm1,pm0] = [0,1] regardless of the status of the cs signal, the ts7001 remains fully powered up in this mode of operation. pm mode 2 s hould be used for fastest throughput rate performance because the system timing design does not need to incorporate the ts7001?s 5- s power-up delay time. figure 10 shows the general operating diagram for the ts7001 in pm mode 2. serial data programmed into the ts7001 at the din input during the first eight clock cycles of data transfer are loaded to the control register. for the ts7001 to remain in pm mode 2, system timing design must always write [pm1, pm0] = [0,1] into the control register on every serial input data transfer. a high-to-low cs transition initiates the conversion sequence and the analog input signal is sampled on the second low-to-high sclk transition. sixteen serial clock cycles are required to complete the conversion and to transfer the conversion result to the host processor. an other conversion can be initiated immediately by toggling the cs pin low again once data transfer is complete (that is, once the cs signal is toggled high). power management mode 3 operation: [pm1, pm0] = [1,0] in this mode, the ts7001 is automatically powered down at the end of every conversion. it is similar to pm mode 1 except that the status of the cs signal in pm mode 3 does not have any effect on the power- down status of the ts7001. figure 11 shows the general operating diagram of the ts7001 in pm mode 3. on the first high-to-low sclk transition after cs is toggled low, all ts7001?s internal circuitry starts to power up. similarly to pm mode 1, it can take as long as 5 s for the ts7001?s internal circuitry to power up completely. as a result, any conversion start sequence should not be initiated during this initial 5- s power-up delay. the analog input signal is sampled on the second low-to- high sclk transition following the high-to-low cs transition. as shown in figure 18, system timing design should incorporate a 5- s delay between the first high-to-low sclk transition and the second low- to-high sclk transition after the high-to-low cs transition. figure 10: ts7001?s power management mode 2 operation diagram.
ts7001 ts7001 rev. 1.0 page 15 in microcontroller applicati ons (or in systems with a slow serial clock), the system timing design can be devised to accommodate this timing alignment by assigning the cs signal to one of the port lines and then adjusting the timing such that the serial data read (from the microcontroller?s serial port) is not initiated for at least 5 s. however, in systems with higher speed serial clocks (not unlike high-speed serial-clock dsp applications), it may not be possible to insert a 5 s delay between adc power up and the first low-to- high sclk transition. therefore, system timing design should incorporate a write to the ts7001?s control register to terminate the adc?s pm mode 3 operation and program the ts7001 into pm mode 2; that is, by writing [pm1,pm0] = [0,1] into the ts7001?s control register. to get a valid conversion result, a second conversion must be initiated when the adc is powered up ? see figure 19. a write operati on that takes place with this second conversion can program the adc back into pm mode 3 where the power-down operation is enabled when the conversion sequence terminates. power management mode 4 operation: [pm1,pm0] = [1,1] in pm mode 4, the ts7001 is automatically placed in standby (or sleep) mode at the end of every conversion. in this mode, all internal circuitry is powered down except for the internal 2.5-v reference. pm mode 4 is similar to pm mode 3; in this case, the power-up delay time is much shorter (1 s vs 5 s) because the internal reference remains powered up at all times. figure 13 shows the general operating diagram of the ts7001 in pm mode 4. on the first high-to-low sclk transition after the cs pin is toggled low, the ts7001 is powered up out of its standby mode. since the ts7001?s power-up delay time pm mode 4 is very short, powering up the adc and executing a conversion with valid results in the same read/write operation is feasible. the analog input signal is figure 11: ts7001?s power management mode 3 operation diagram for slow-sclk microcontrollers. figure 12: ts7001?s power management mode 3 operation diagr am for fast-sclk microcontrollers and dsps.
ts7001 page 16 ts7001 rev. 1.0 sampled on the second low-to-high sclk transition following the high-to-low cs transition. at the end of conversion (after the last low-to-high sclk transition), the adc is powered down automatically back into its standby mode. the ts7001?s serial interface description figure 14 shows the detailed timing diagram for ts7001?s serial interface. t he serial clock provides the conversion clock and also controls the transfer of data to/from the ts7001 during conversion. the cs signal initiates the serial data transfer and controls the ts7001?s conversion process. in pm modes 1, 3, and 4, a high-to-low cs transition powers up the adc. in all cases, the cs signal gates sclk to the ts7001 and sets the adc?s internal track-and-hold into track mode. the analog input signal is then sampled on the second low-to- high sclk transition following the high-to-low cs transition. thus, the analog input signal is acquired during the first 1.5 sclk clock cycles (t acq ) after the high-to-low cs transition. in modes where the high- to-low cs transition powers up the adc, the acquisition time must include a 5- s power-up delay. the adc?s internal track-and-hold moves from track mode to hold mode on the second low-to-high sclk transition and a conversion is also initiated on this transition. the conversion process takes an additional 14.5 sclk cycles to complete. after the conversion is completed, a subsequent low-to-high cs transition sets the serial data bus back into a high-z (or three-state) co ndition. a new conversion can be initiated if the cs signal is left low. in dual-channel operation, the current conversion result is associated to the selected analog channel programmed during the previ ous write cycle to the control register. therefore, in dual-channel operation, the system co de design must perform a channel address write for the next conversion while the current conversion is in progress. writing serial data to the control register always takes place and occurs on the first eight low-to-high figure 14: ts7001?s detailed serial interface timing diagram. figure 13: ts7001?s power management mode 4 operation diagram.
ts7001 ts7001 rev. 1.0 page 17 sclk transitions. however, the ts7001 can be configured as a read-only device by physically loading all ?zeros? (?0?s) into the control register every time, by applying a logic low to the din pin at all times, or by hard-wiring the din pin to gnd. when the ts7001 is configured in write/read modes, system code design must be designed always to load the corre ct data onto the din line when reading data from the ts7001. sixteen serial clock cycles are required to perform the conversion proce ss and to transfer data to/access data from the ts7001. in applications where the first serial clock transition following a high- to-low cs transition is a high-to-low sclk transition, dout transitions from a high-z state to a first leading zero; thus, the first low-to-high sclk transition generates the first leading zero on dout. in applications where the first serial clock transition following a high-to-low cs transition is a low-to-high sclk transition, the first leading zero may not be set up in time for the host processor to read it correctly. however, subsequent dout bits are transferred out on high-to-low sclk transi tions so that they are ready for the host processor on the following low-to- high sclk transition. thus, the second leading zero is transferred out on the high-to-low sclk transition subsequent to the first low-to-high sclk transition. therefore, dout?s final bit in the data transfer is valid on the 16th low-to-high sclk transition, having been transferred out of t he adc on the previous high-to-low sclk transition. interfacing the ts7001 to industry-standard microprocessors and dsps the serial interface on the ts7001 allows the adc to be directly connected to a number of many microprocessors and dsps. how to interface the ts7001 with some of the more common microcontroller and dsp seri al interface protocols is covered in this section. a ts7001 to tms320c5x dsp interface with peripheral serial devices like the ts7001, the tms320c5x?s serial interface has a continuous serial clock and frame synchronization signals to time the data transfer operations. a single logic inverter is the only glue logic required between the tms320c5x?s clkx output and the ts7001 sclk input and is illustrated in the connection diagram of figure 15. the tms320c5x?s serial port is configured to operate in burst mode using the tms320c5x?s internal clkx (serial clock transmit) and fsx (frame sync transmit) programmed as the ts7001?s cs input. the tms320c5x?s serial port control register (spc) must be configured in the following manner: table 3: tms320c5x serial port control register setup fo fsm mcm txm 0 1 1 1 a ts7001 to adsp-21xx dsp interface the ts7001 is easily interfaced to the adsp-21xx (or equivalent) family of dsps using an inverter between the adsp-21xx?s serial clock and the ts7001 as shown in figure 16. the adsp-21xx?s sport control register should be configured in alternate framing mode as shown in table 4 and t he adsp-21xx?s serial clock frequency is set in its sclkdiv register. table 4: sport0 control register setup bit(s) setting description tfsw, rfsw 1 alternative framing invrfs, invtfs 1 active-low frame signal dtype 00 right justified data slen 1111 16-bit data word isclk 1111 internal serial clock tfsr, rfsr 1 frame every word irfs 0 itfs 1 figure 15: interfacing the ts7001 to tms320c5x-type dsps. figure 16: interfacing the ts7001 to adsp-21xx-type dsps.
ts7001 page 18 ts7001 rev. 1.0 with the adsp-21xx?s tfs and rfs pins of its sport connected together, the tfs is configured as an output and rfs configured as an input. the frame synchronization signal generated on the tfs output serves as the ts7001?s cs input. in this example, however, since a timer interrupt is used to control the sampling rate of the adc, it may not be possible to perform equidistant sampling (a required criterion in all signal pr ocessing applications) under certain application conditions. the adsp-21xx?s timer registers are configured in such a manner that an interrupt is generated internally at the required sample interval. when the timer interrupt is received, an adc control word is transmitted at the dt output with tfs. the tfs signal is then used to control the rfs and hence the data read from the ts7001. when the instruction to transmit with tfs is executed (that is, ax0 = tx0), the state of the sclk is checked. the dsp waits until the sclk has toggled high-to-low-to-high before a transmission will commence. if the timer and sclk values are set such that the instruction to transmit occurs on or near the low-to-high sclk transition, data may be transmitted or the dsp may wait to transmit data until the next clock edge. for example, consider an adsp-2111 that has been chosen as the host processor. since it has a 16-mhz master clock frequency, a sclkdiv value of 3 is necessary to program its sport serial clock output to operate at 2mhz for the ts7001 (16mhz 2 3 = 2mhz); thus, eight master clock periods will elapse for every one ts7001 sclk period. if the adsp-2111?s timer registers are loaded with a value of 803, 100.5 sclks will occur between interrupts and subsequently between transmit instructions. because the transmit instruction occurs on an sc lk edge, non-equidistant sampling is the result. the dsp will implement equidistant sampling only if the number of sclks between interrupts is a whole integer number. a ts7001 to dsp56xxx dsp interface connecting the ts7001 for use with freescale?s (nee motorola?s) dsp56xxx family of dsps is shown in figure 17 where an inverter is used between the dsp56xxx?s sck output and the ts7001?s sclk input. the dsp56xxx?s ssi (synchronous serial interface) is configured in synchronous mode (syn bit = 1 in crb) with an internally generated 1-bit clock period frame sync for both tx and rx (bits fsl1 = 1 and fsl0 = 0 in crb). word length is set to 16 by setting bits wl1 = 1 and wl0 = 0 in cra. a ts7001 to 68hc11 microcontroller interface connecting the ts7001 to freescale?s 68hc11 (nee motorola?s mc68hc11) is shown in figure 18. the microcontroller?s serial per ipheral interface (spi) is configured for master mode (mstr = 1) with its clock polarity bit (cpol) set to 1 and clock phase bit (cpha) set to 1. seri al data transfer from the ts7001 to the 68hc11 requires two 8-bit transfers and the 68hc11?s spi is configured by writing to the spi control register (spcr) ? consult the 68hc11 user manual for more information. a ts7001 to 8051 microcontroller interface using the parallel port of legacy 8051-type (or equivalent) microcontrollers, a serial interface to the ts7001 can be designed as shown in figure 19. as a result, full duplex serial transfer to be implemented. the technique involves ?bit-banging? one of the the microcontro ller?s i/o ports (for figure 18: interfacing the ts7001 to 68hc11-type microcontrollers. figure 17: interfacing the ts7001 to dsp56xxx-type dsps. figure 19: interfacing the ts7001 to legacy 8051-type microcontrollers.
ts7001 ts7001 rev. 1.0 page 19 example, p1.0) to generat e a serial clock and using two other i/o ports (for example, p1.1 for dout and p1.2 for din) to transfer data from/to the ts7001. a ts7001 to pic16c6x/pic16c7x microcontroller interface as shown in figure 20, the connection between the ts7001 and the pic16c6x/pic16c7x is simple and does not require any glue logic circuits. the pic16c6x synchr onous serial port (ssp) is configured as an spi master with its clock polarity bit set to 1 by writing to the synchronous serial port control register (sspcon). in this example, i/o port ra1 is being used to generate the ts7001?s cs signal. since this microcontroller family only transfers eight bits of data during each serial transfer operation, two consecutive read/write operations are required. for additional information, please consult the pic16/pic17 microcontroller user manual . applications information ground plane management and layout for best performance, printed circuit boards should always be used and wire-wrap boards are not recommended. good pc board layout techniques ensure that digital and analog signal lines are kept separate from each other, analog and digital (especially clock) lines are not routed parallel to one another, and high-speed digita l lines are not routed underneath the adc package. a contiguous analog ground plane should be routed under the ts7001 to avoid digital noise coupling. a single-point analog ground (star ground point) should be created at the adc?s gnd and separate from any digital logic grou nd. all analog grounds as well as the adc?s gnd pin should be connected to the star ground. no othe r digital system ground should be made to this ground connection. for lowest-noise operation, the ground return to the star ground?s power supply should be low impedance and as short as possible. even though the ts7001?s exhi bits excellent supply rejection as shown in th typical operating characteristics, it is always considered good engineering practice to prevent high-frequency noise on the ts7001?s vdd power supply from affecting the adc?s high-speed com parator. therefore, the vdd supply pin should be bypassed to the star ground with 0.1 f and 10 f capacitors in parallel and placed close to the adc?s pin 2 as was shown in figure 4. component lead lengths should be very short for optimal supply-noise rejection. if the power supply is very noisy, an optional 10- ? resistor inserted in series with the ts7001?s vdd pin can be used in conjunction with the bypass capacitors to form a low-pass filter. evaluating the ts7001?s dynamic performance the recommended layout for the ts7001 is outlined in the demo board manual for the ts7001. the demo board kit includes a fully assembled/tested demo board and documentation describing how to evaluate the ts7001?s dynam ic performance using silicon labs proprietary tsda-vb data acquisition/capture kit. figure 20: interfacing the ts7001 to pic16c6x/pic16c7x-type microcontrollers.
ts7001 page 20 silicon laboratories, inc. ts7001 rev. 1.0 400 west cesar chavez, austin, tx 78701 +1 (512) 416-8500 ? www.silabs.com package outline drawing 8-pin msop package outline drawing (n.b., drawings are not to scale) patent notice silicon labs invests in research and development to help our custom ers differentiate in the market with innovative low-power, s mall size, analog-intensive mixed-signal solutions. s ilicon labs' extensive patent portfolio is a testament to our unique approach and wor ld-class engineering team. the information in this document is believed to be accurate in all respects at the time of publication but is subject to change without notice. silicon laboratories assumes no responsibility for errors and om issions, and disclaims responsib ility for any consequences resu lting from the use of information included herein. additionally, silicon laborat ories assumes no responsibility for the functioning of undescr ibed features or parameters. silicon laboratories reserves the right to make c hanges without further notice. silicon laboratories makes no warra nty, representation or guarantee regarding the suitability of its pr oducts for any particular purpose, nor does silicon laboratories assume any liability arising out of the application or use of any product or circ uit, and specifically disclaims any and all liability, in cluding without limitation consequential or incidental damages. silicon laboratories products are not designed, intended, or authorized for use in applica tions intended to support or sustain life, or for any other application in wh ich the failure of the silicon laboratories product could create a situation where personal injury or death may occur. should buyer purchase or use silicon laboratories products for any such unintended or unaut horized application, buyer shall indemnify and hold silicon laboratories harmless against all claims and damages. silicon laboratories and silicon labs are tr ademarks of silicon laboratories inc. other products or brandnames mentioned herein are trademarks or registered trademarks of their respective holders.
disclaimer silicon laboratories intends to provide customers with the latest, accurate, and in-depth documentation of all peripherals and modules available for system and software implementers using or intending to use the silicon laboratories products. characterization data, available modules and peripherals, memory sizes and memory addresses refer to each specific device, and "typical" parameters provided can and do vary in different applications. application examples described herein are for illustrative purposes only. silicon laboratories reserves the right to make changes without further notice and limitation to product information, specifications, and descriptions herein, and does not give warranties as to the accuracy or completeness of the included information. silicon laboratories shall have no liability for the consequences of use of the information supplied herein. this document does not imply or express copyright licenses granted hereunder to design or fabricate any integrated circuits. the products must not be used within any life support system without the specific written consent of silicon laboratories. a "life support system" is any product or system intended to support or sustain life and/or health, which, if it fails, can be reasonably expected to result in significant personal injury or death. silicon laboratories products are generally not intended for military applications. silicon laboratories products shall under no circumstances be used in weapons of mass destruction including (but not limited to) nuclear, biological or chemical weapons, or missiles capable of delivering such weapons. trademark information silicon laboratories inc., silicon laboratories, silicon labs, silabs and the silicon labs logo, cmems?, efm, efm32, efr, energy micro, energy micro logo and combinations thereof, "the world?s most energy friendly microcontrollers", ember?, ezlink?, ezmac?, ezradio?, ezradiopro?, dspll?, isomodem ?, precision32?, proslic?, siphy?, usbxpress? and others are trademarks or registered trademarks of silicon laboratories inc. arm, cortex, cortex-m3 and thumb are trademarks or registered trademarks of arm holdings. keil is a registered trademark of arm limited. all other products or brand names mentioned herein are trademarks of their respective holders. http://www.silabs.com silicon laboratories inc. 400 west cesar chavez austin, tx 78701 usa smart. connected. energy-friendly products www.silabs.com/products quality www.silabs.com/quality support and community community.silabs.com

▲Up To Search▲

Price & Availability of TS7001IM8

	To Download TS7001IM8 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .