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tlv1543c, tlv1543m 3.3-v 10-bit analog-to-digital converters with serial control and 11 analog inputs slas072c december 1992 revised march 1995 copyright ? 1995, texas instruments incorporated 21 post office box 655303 ? dallas, texas 75265 ? 3.3-v supply operation ? 10-bit-resolution a/d converter ? 11 analog input channels ? three built-in self-test modes ? inherent sample and hold ? total unadjusted erro r... 1 lsb max ? on-chip system clock ? end-of-conversion (eoc) output ? pin compatible with tlc1543 ? cmos technology description the tlv1543c and tlv1543m are cmos 10-bit, switched-capacitor, successive-approximation, analog-to-digital converters. these devices have three inputs and a 3-state output [chip select (cs ), input-output clock (i/o clock), address input (address), and data output (data out)] that provide a direct 4-wire interface to the serial port of a host processor. the devices allow high-speed data transfers from the host. in addition to a high-speed a /d converter and versatile control capability, these devices have an on-chip 14-channel multiplexer that can select any one of 11 analog inputs or any one of three internal self-test voltages. the sample-and-hold function is automatic. at the end of a /d conversion, the end-of-conversion (eoc) output goes high to indicate that conversion is complete. the converter incorporated in the devices features differential high-impedance reference inputs that facilitate ratiometric conversion, scaling, and isolation of analog circuitry from logic and supply noise. a switched-capacitor design allows low-error conversion over the full operating free-air temperature range. the tlv1543c is characterized for operation from 0 c to 70 c. the tlv1543m is characterized for operation over the full military temperature range of 55 c to 125 c. available options t package t a small outline (db) small outline (dw) chip carrier (fk) ceramic dip (j) plastic dip (n) plastic chip carrier (fn) 0 c to 70 c tlv1543cdb tlv1543cdw e e tlv1543cn tlv1543cfn 55 c to 125 c e e tlv1543mfk tlv1543mj e e 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 a0 a1 a2 a3 a4 a5 a6 a7 a8 gnd v cc eoc i/o clock address data out cs ref + ref a10 a9 db, dw, fk, j, or n package (top view) 3 2 1 20 19 910111213 4 5 6 7 8 18 17 16 15 14 i/o clock address data out cs ref + a3 a4 a5 a6 a7 fn package (top view) a2 a1 a0 a10 ref eoc a8 gnd a9 cc v production data information is current as of publication date. products conform to specifications per the terms of texas instruments standard warranty. production processing does not necessarily include testing of all parameters.
tlv1543c, tlv1543m 3.3-v 10-bit analog-to-digital converters with serial control and 11 analog inputs slas072c december 1992 revised march 1995 22 post office box 655303 ? dallas, texas 75265 functional block diagram 14-channel analog multiplexer sample and hold 10-bit analog-to-digital converter (switched capacitors) self-test reference output data register 10-to-1 data selector and driver system clock, control logic, and i/o counters input address register 4 10 10 4 ref + ref data out address i/o clock cs 3 eoc 1 2 3 4 5 6 7 8 9 11 12 a0 a1 a2 a3 a4 a5 a6 a7 a8 a9 a10 14 13 16 19 17 18 15 typical equivalent inputs input circuit impedance during sampling mode input circuit impedance during hold mode 1 k w typ c i = 60 pf typ (equivalent input capacitance) 5 m w typ a0 a10 a0 a10
tlv1543c, tlv1543m 3.3-v 10-bit analog-to-digital converters with serial control and 11 analog inputs slas072c december 1992 revised march 1995 23 post office box 655303 ? dallas, texas 75265 terminal functions terminal i/o description name no. i/o description address 17 i serial address. a 4-bit serial address selects the desired analog input or test voltage that is to be converted next. the address data is presented with the msb first and is shifted in on the first four rising edges of i/o clock. after the four address bits have been read into the address register, address is ignored for the remainder of the current conversion period. a0 a10 1 9, 11, 12 i analog signal. the 11 analog inputs are applied to a0 a10 and are internally multiplexed. the driving source impedance should be less than or equal to 1 k w . cs 15 i chip select. a high-to-low transition on cs resets the internal counters and controls and enables data out, address, and i/o clock within a maximum of a setup time plus two falling edges of the internal system clock. a low-to-high transition disables address and i/o clock within a setup time plus two falling edges of the internal system clock. data out 16 o the 3-state serial output for the a/d conversion result. data out is in the high-impedance state when cs is high and active when cs is low. with a valid chip select, data out is removed from the high-impedance state and is driven to the logic level corresponding to the msb value of the previous conversion result. the next falling edge of i/o clock drives data out to the logic level corresponding to the next most significant bit, and the remaining bits are shifted out in order with the lsb appearing on the ninth falling edge of i/o clock. on the tenth falling edge of i/o clock, data out is driven to a low logic level so that serial interface data transfers of more than ten clocks produce zeroes as the unused lsbs. eoc 19 o end of conversion. eoc goes from a high- to a low- logic level on the trailing edge of the tenth i/o clock and remains low until the conversion is complete and data are ready for transfer. gnd 10 i the ground return terminal for the internal circuitry. unless otherwise noted, all voltage measurements are with respect to gnd. i/o clock 18 i input/output clock. i/o clock receives the serial i/o clock input and performs the following four functions: 1) it clocks the four input address bits into the address register on the first four rising edges of i/o clock with the multiplex address available after the fourth rising edge. 2) on the fourth falling edge of i/o clock, the analog input voltage on the selected multiplex input begins charging the capacitor array and continues to do so until the tenth falling edge of i/o clock. 3) it shifts the nine remaining bits of the previous conversion data out on data out. 4) it transfers control of the conversion to the internal state controller on the falling edge of the tenth clock. ref + 14 i the upper reference voltage value (nominally v cc ) is applied to ref +. the maximum input voltage range is determined by the difference between the voltage applied to ref + and the voltage applied to the ref terminal. ref 13 i the lower reference voltage value (nominally ground) is applied to ref . v cc 20 i positive supply voltage detailed description with chip select (cs ) inactive (high), the address and i/o clock inputs are initially disabled and data out is in the high-impedance state. when the serial interface takes cs active (low), the conversion sequence begins with the enabling of i/o clock and address and the removal of data out from the high-impedance state. the host then provides the 4-bit channel address to address and the i/o clock sequence to i/o clock. during this transfer, the host serial interface also receives the previous conversion result from data out. i/o clock receives an input sequence that is between 10 and 16 clocks long from the host. the first four i/o clocks load the address register with the 4-bit address on address selecting the desired analog channel and the next six clocks providing the control timing for sampling the analog input.
tlv1543c, tlv1543m 3.3-v 10-bit analog-to-digital converters with serial control and 11 analog inputs slas072c december 1992 revised march 1995 24 post office box 655303 ? dallas, texas 75265 detailed description (continued) there are six basic serial interface timing modes that can be used with the device. these modes are determined by the speed of i/o clock and the operation of cs as shown in table 1. these modes are (1) a fast mode with a 10-clock transfer and cs inactive (high) between conversion cycles, (2) a fast mode with a 10-clock transfer and cs active (low) continuously, (3) a fast mode with an 11- to 16-clock transfer and cs inactive (high) between conversion cycles, (4) a fast mode with a 16-bit transfer and cs active (low) continuously, (5) a slow mode with an 11- to 16-clock transfer and cs inactive (high) between conversion cycles, and (6) a slow mode with a 16-clock transfer and cs active (low) continuously. the msb of the previous conversion appears on data out on the falling edge of cs in mode 1, mode 3, and mode 5, on the rising edge of eoc in mode 2 and mode 4, and following the 16th clock falling edge in mode 6. the remaining nine bits are shifted out on the next nine falling edges of i/o clock. ten bits of data are transmitted to the host through data out. the number of serial clock pulses used also depends on the mode of operation, but a minimum of ten clock pulses is required for conversion to begin. on the 10th clock falling edge, the eoc output goes low and returns to the high logic level when conversion is complete and the result can be read by the host. on the 10th clock falling edge, the internal logic takes data out low to ensure that the remaining bit values are zero if the i/o clock transfer is more than ten clocks long. table 1 lists the operational modes with respect to the state of cs , the number of i/o serial transfer clocks that can be used, and the timing edge on which the msb of the previous conversion appears at the output. table 1. mode operation modes cs no. of i/o clocks msb at data out 2 timing diagram fmd mode 1 high between conversion cycles 10 cs falling edge figure 9 fast modes mode 2 low continuously 10 eoc rising edge figure 10 f as t m o d es mode 3 high between conversion cycles 11 to 16 3 cs falling edge figure 11 mode 4 low continuously 16 3 eoc rising edge figure 12 slow modes mode 5 high between conversion cycles 11 to 16 3 cs falling edge figure 13 sl ow m o d es mode 6 low continuously 16 3 16th clock falling edge figure 14 2 these edges also initiate serial-interface communication. 3 no more than 16 clocks should be used. fast modes the device is in a fast mode when the serial i/o clock data transfer is completed before the conversion is completed. with a 10-clock serial transfer, the device can only run in a fast mode since a conversion does not begin until the falling edge of the 10th i/o clock. mode 1: fast mode, cs inactive (high) between conversion cycles, 10-clock transfer in this mode, cs is inactive (high) between serial i/o clock transfers and each transfer is ten clocks long. the falling edge of cs begins the sequence by removing data out from the high-impedance state. the rising edge of cs ends the sequence by returning data out to the high-impedance state within the specified delay time. also, the rising edge of cs disables the i/o clock and address terminals within a setup time plus two falling edges of the internal system clock. mode 2: fast mode, cs active (low) continuously, 10-clock transfer in this mode, cs is active (low) between serial i/o clock transfers and each transfer is ten clocks long. after the initial conversion cycle, cs is held active (low) for subsequent conversions; the rising edge of eoc then begins each sequence by removing data out from the low logic level, allowing the msb of the previous conversion to appear immediately on this output.
tlv1543c, tlv1543m 3.3-v 10-bit analog-to-digital converters with serial control and 11 analog inputs slas072c december 1992 revised march 1995 25 post office box 655303 ? dallas, texas 75265 mode 3: fast mode, cs inactive (high) between conversion cycles, 11- to 16-clock transfer in this mode, cs is inactive (high) between serial i/o clock transfers and each transfer can be 11 to 16 clocks long. the falling edge of cs begins the sequence by removing data out from the high-impedance state. the rising edge of cs ends the sequence by returning data out to the high-impedance state within the specified delay time. also, the rising edge of cs disables the i/o clock and address terminals within a setup time plus two falling edges of the internal system clock. mode 4: fast mode, cs active (low) continuously, 16-clock transfer in this mode, cs is active (low) between serial i/o clock transfers and each transfer must be exactly 16 clocks long. after the initial conversion cycle, cs is held active (low) for subsequent conversions; the rising edge of eoc then begins each sequence by removing data out from the low logic level, allowing the msb of the previous conversion to appear immediately on this output. slow modes in a slow mode, the conversion is completed before the serial i/o clock data transfer is completed. a slow mode requires a minimum 11-clock transfer into i/o clock, and the rising edge of the eleventh clock must occur before the conversion period is complete; otherwise, the device loses synchronization with the host serial interface, and cs has to be toggled to initialize the system. the eleventh rising edge of the i/o clock must occur within 9.5 m s after the tenth i/o clock falling edge. mode 5: slow mode, cs inactive (high) between conversion cycles, 11- to 16-clock transfer in this mode, cs is inactive (high) between serial i/o clock transfers and each transfer can be 11 to 16 clocks long. the falling edge of cs begins the sequence by removing data out from the high-impedance state. the rising edge of cs ends the sequence by returning data out to the high-impedance state within the specified delay time. also, the rising edge of cs disables the i/o clock and address terminals within a setup time plus two falling edges of the internal system clock. mode 6: slow mode, cs active (low) continuously, 16-clock transfer in this mode, cs is active (low) between serial i/o clock transfers and each transfer must be exactly 16 clocks long. after the initial conversion cycle, cs is held active (low) for subsequent conversions. the falling edge of the sixteenth i/o clock then begins each sequence by removing data out from the low state, allowing the msb of the previous conversion to appear immediately at data out. the device is then ready for the next 16-clock transfer initiated by the serial interface. address bits the 4-bit analog channel-select address for the next conversion cycle is presented to the address terminal (msb first) and is clocked into the address register on the first four leading edges of i/o clock. this address selects one of 14 inputs (11 analog inputs or 3 internal test inputs). analog inputs and test modes the 11 analog inputs and the 3 internal test inputs are selected by the 14-channel multiplexer according to the input address as shown in tables 2 and 3. the input multiplexer is a break-before-make type to reduce input-to-input noise injection resulting from channel switching. sampling of the analog input starts on the falling edge of the fourth i/o clock, and sampling continues for six i/o clock periods. the sample is held on the falling edge of the tenth i/o clock. the three test inputs are applied to the multiplexer, sampled, and converted in the same manner as the external analog inputs.
v ref + v ref 2 tlv1543c, tlv1543m 3.3-v 10-bit analog-to-digital converters with serial control and 11 analog inputs slas072c december 1992 revised march 1995 26 post office box 655303 ? dallas, texas 75265 table 2. analog-channel-select address analog input selected value shifted into address input selected binary hex a0 0000 0 a1 0001 1 a2 0010 2 a3 0011 3 a4 0100 4 a5 0101 5 a6 0110 6 a7 0111 7 a8 1000 8 a9 1001 9 a10 1010 a table 3. test-mode-select address internal self-test voltage selected 2 value shifted into address input output result (hex) 3 voltage selected 2 binary hex output result (hex) 1011 b 200 v ref 1100 c 000 v ref + 1101 d 3ff 2 v ref + is the voltage applied to the ref + input, and v ref is the voltage applied to the ref input. 3 the output results shown are the ideal values and vary with the reference stability and with internal offsets. converter and analog input the cmos threshold detector in the successive-approximation conversion system determines each bit by examining the charge on a series of binary-weighted capacitors (see figure 1). in the first phase of the conversion process, the analog input is sampled by closing the s c switch and all s t switches simultaneously. this action charges all the capacitors to the input voltage. in the next phase of the conversion process, all s t and s c switches are opened and the threshold detector begins identifying bits by identifying the charge (voltage) on each capacitor relative to the reference (ref ) voltage. in the switching sequence, ten capacitors are examined separately until all ten bits are identified and the charge-convert sequence is repeated. in the first step of the conversion phase, the threshold detector looks at the first capacitor (weight = 512). node 512 of this capacitor is switched to the ref+ voltage, and the equivalent nodes of all the other capacitors on the ladder are switched to ref . if the voltage at the summing node is greater than the trip point of the threshold detector (approximately one-half the v cc voltage), a bit 0 is placed in the output register and the 512-weight capacitor is switched to ref . if the voltage at the summing node is less than the trip point of the threshold detector, a bit 1 is placed in the register and the 512-weight capacitor remains connected to ref + through the remainder of the successive-approximation process. the process is repeated for the 256-weight capacitor, the 128-weight capacitor, and so forth down the line until all bits are counted. with each step of the successive-approximation process, the initial charge is redistributed among the capacitors. the conversion process relies on charge redistribution to count and weigh the bits from msb to lsb.
tlv1543c, tlv1543m 3.3-v 10-bit analog-to-digital converters with serial control and 11 analog inputs slas072c december 1992 revised march 1995 27 post office box 655303 ? dallas, texas 75265 converter and analog input (continued) s c threshold detector node 512 ref ref+ s t 512 v i to output latches ref s t ref+ ref s t ref+ ref s t ref+ ref s t ref+ ref s t ref+ ref s t ref+ ref s t ref s t 1 1 2 4 8 16 128 256 figure 1. simplified model of the successive-approximation system chip-select operation the trailing edge of cs starts all modes of operation, and cs can abort a conversion sequence in any mode. a high-to-low transition on cs within the specified time during an ongoing cycle aborts the cycle, and the device returns to the initial state (the contents of the output data register remain at the previous conversion result). exercise care to prevent cs from being taken low close to completion of conversion because the output data can be corrupted. reference voltage inputs there are two reference inputs used with these devices: ref + and ref . these voltage values establish the upper and lower limits of the analog input to produce a full-scale and zero-scale reading respectively. the values of ref +, ref , and the analog input should not exceed the positive supply or be lower than gnd consistent with the specified absolute maximum ratings. the digital output is at full scale when the input signal is equal to or higher than ref + and at zero when the input signal is equal to or lower than ref . absolute maximum ratings over operating free-air temperature range (unless otherwise noted) 2 supply voltage range, v cc (see note 1): tlv1543c 0.5 v to 6.5 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . tlv1543m 0.5 v to 6 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . input voltage range, v i (any input) 0.3 v to v cc + 0.3 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . output voltage range, v o 0.3 v to v cc + 0.3 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . positive reference voltage, v ref + v cc + 0.1 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . negative reference voltage, v ref 0.1 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . peak input current (any input) 20 ma . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . peak total input current (all inputs) 30 ma . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . operating free-air temperature range, t a : tlv1543c 0 c to 70 c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . tlv1543m 55 c to 125 c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . storage temperature range, t stg 65 c to 150 c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . lead temperature 1,6 mm (1/16 inch) from the case for 10 seconds 260 c . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 stresses beyond those listed under aabsolute maximum ratingso may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under arecommended operating conditionso is not implied. exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. note 1: all voltage values are with respect to digital ground with ref and gnd wired together (unless otherwise noted).
tlv1543c, tlv1543m 3.3-v 10-bit analog-to-digital converters with serial control and 11 analog inputs slas072c december 1992 revised march 1995 28 post office box 655303 ? dallas, texas 75265 recommended operating conditions min nom max unit supply voltage v cc tlv1543c 3 3.3 5.5 v s upp l y vo lt age, v cc tlv1543m 3 3.3 3.6 v positive reference voltage, v ref + (see note 2) v cc v negative reference voltage, v ref (see note 2) 0 v differential reference voltage, v ref + v ref (see note 2) 2.5 v cc v cc + 0.2 v analog input voltage (see note 2) 0 v cc v high-level control input voltage v ih tlv1543c v cc = 3 v to 5.5 v 2 v hi g h - l eve l con t ro l i npu t vo lt age, v ih tlv1543m v cc = 3 v to 3.6 v 2 v low-level control input voltage v il tlv1543c v cc = 3 v to 5.5 v 0.6 v l ow- l eve l con t ro l i npu t vo lt age, v il tlv1543m v cc = 3 v to 3.6 v 0.8 v setup time, address bits at data input before i/o clock , t su(a) (see figure 4) 100 ns hold time, address bits after i/o clock , t h(a) (see figure 4) 0 ns hold time, cs low after last i/o clock , t h(cs) 0 ns setup time, cs low before clocking in first address bit, t su(cs) (see note 3) 1.425 m s clock frequency at i/o clock (see note 4) tlc1543c 0 1.1 mhz cl oc k f requency a t i/o clock ( see n o t e 4) tlc1543m 0 2.1 mh z pulse duration, i/o clock high, t wh(i/o) 190 ns pulse duration, i/o clock low, t wl(i/o) 190 ns transition time, i/o clock, t t(i/o) (see note 5) 1 m s transition time, address and cs , t t(cs) 10 m s operating free-air temperature t a tlv1543c 0 70 c o pera ti ng f ree-a i r t empera t ure, t a tlv1543m 55 125 c notes: 2. analog input voltages greater than that applied to ref+ convert as all ones (1 11111111 1), while input voltages less than that applied to ref convert as all zeros (0000000000). the device is functional with reference voltages down to 1 v (v ref + v ref ); however, the electrical specifications are no longer applicable. 3. to minimize errors caused by noise at cs , the internal circuitry waits for a setup time plus two falling edges of the internal system clock after cs before responding to control input signals. no attempt should be made to clock in an address until the minimum cs setup time has elapsed. 4. for 11- to 16-bit transfers, after the tenth i/o clock falling edge ( 2 v), at least one i/o clock rising edge ( 2 v) must occur within 9.5 m s. 5. this is the time required for the clock input signal to fall from v ih min to v il max or to rise from v il max to v ih min. in the vicinity of normal room temperature, the devices function with input clock transition time as slow as 1 m s for remote data-acquisition applications where the sensor and the a/d converter are placed several feet away from the controlling microprocessor.
tlv1543c, tlv1543m 3.3-v 10-bit analog-to-digital converters with serial control and 11 analog inputs slas072c december 1992 revised march 1995 29 post office box 655303 ? dallas, texas 75265 electrical characteristics over recommended operating free-air temperature range, v cc = v ref+ = 3 v to 5.5 v, i/o clock frequency = 1.1 mhz for the tlv1543c, v cc = v ref+ = 3 v to 3.6 v, i/o clock frequency = 2.1 mhz for the tlv1543m (unless otherwise noted) parameter test conditions min typ 2 max unit v hi h l l tlv1543c v cc = 3 v, i oh = 1.6 ma 2.4 v v oh high-level output tlv1543c v cc = 3 v to 5.5 v, i oh = 20 m a v cc 0.1 v v oh high level output voltage tlv1543m v cc = 3 v, i oh = 1.6 ma 2.4 v tlv1543m v cc = 3 v to 3.6 v, i oh = 20 m a v cc 0.1 v v lll tlv1543c v cc = 3 v, i ol = 1.6 ma 0.4 v v ol low-level output tlv1543c v cc = 3 v to 5.5 v, i ol = 20 m a 0.1 v v ol low level output voltage tlv1543m v cc = 3 v, i ol = 1.6 ma 0.4 v tlv1543m v cc = 3 v to 3.6 v, i ol = 20 m a 0.1 v i oz off-state (high-impedance-state) v o = v cc , cs at v cc 10 m a i oz off state (high impedance state) output current v o = 0, cs at v cc 10 m a i ih high-level input current v i = v cc 0.005 2.5 m a i il low-level input current v i = 0 0.005 2.5 m a i cc operating supply current cs at 0 v 0.8 2.5 ma selected channel leakage current selected channel at v cc , unselected channel at 0 v 1 m a s e l ec t e d c h anne l l ea k age curren t selected channel at 0 v, unselected channel at v cc 1 m a maximum static analog reference current into ref + v ref + = v cc , v ref = gnd 10 m a c input capacitance, tlv1543c 7 55 pf c i input capacitance, analog inputs tlv1543m 7 p f c i input capacitance, tlv1543c 5 15 pf input capacitance, control inputs tlv1543m 5 p f 2 all typical values are at v cc = 5 v, t a = 25 c.
tlv1543c, tlv1543m 3.3-v 10-bit analog-to-digital converters with serial control and 11 analog inputs slas072c december 1992 revised march 1995 210 post office box 655303 ? dallas, texas 75265 operating characteristics over recommended operating free-air temperature range, v cc = v ref+ = 3 v to 5.5 v, i/o clock frequency = 1.1 mhz for the tlv1543c, v cc = v ref+ = 3 v to 3.6 v, i/o clock frequency = 2.1 mhz for the tlv1543m parameter test conditions min typ 2 max unit linearity error (see note 6) 1 lsb zero error (see note 7) see note 2 1 lsb full-scale error (see note 7) see note 2 1 lsb total unadjusted error (see note 8) 1 lsb s lf d ( t bl 3 d n 9) address = 1011 512 self-test output code (see table 3 and note 9) address = 1100 0 p( ) address = 1101 1023 t conv conversion time see figures 9 14 21 m s t c total cycle time (access, sample, and conversion) see figures 9 14 and note 10 21 +10 i/o clock periods m s t acq channel acquisition time (sample) see figures 9 14 and note 10 6 i/o clock periods t v valid time, data out remains valid after i/o clock see figure 6 10 ns t d(i/o-data) delay time, i/o clock to data out valid see figure 6 240 ns t d(i/o-eoc) delay time, tenth i/o clock to eoc see figure 7 70 240 ns t d(eoc-data) delay time, eoc to data out (msb) see figure 8 100 ns t pzh , t pzl enable time, cs to data out (msb driven) see figure 3 1.3 m s t phz , t plz disable time, cs to data out (high impedance) see figure 3 150 ns t r(eoc) rise time, eoc see figure 8 300 ns t f(eoc) fall time, eoc see figure 7 300 ns t r(bus) rise time, data bus see figure 6 300 ns t f(bus) fall time, data bus see figure 6 300 ns t d(i/o-cs) delay time, tenth i/o clock to cs to abort conversion (see note 11) 9 m s 2 all typical values are at t a = 25 c. notes: 2. analog input voltages greater than that applied to ref + convert as all ones (1 11111111 1), while input voltages less than that applied to ref convert as all zeros (0000000000). the device is functional with reference voltages down to 1 v (v ref + v ref ); however, the electrical specifications are no longer applicable. 6. linearity error is the maximum deviation from the best straight line through the a/d transfer characteristics. 7. zero-scale error is the difference between 0000000000 and the converted output for zero input voltage; full-scale error is the difference between 1 111111111 and the converted output for full-scale input voltage. 8. total unadjusted error comprises linearity, zero-scale, and full-scale errors. 9. both the input address and the output codes are expressed in positive logic. 10. i/o clock period = 1/(i/o clock frequency) (see figure 6). 11. any transitions of cs are recognized as valid only if the level is maintained for a setup time plus two falling edges of the internal clock (1.425 m s) after the transition.
tlv1543c, tlv1543m 3.3-v 10-bit analog-to-digital converters with serial control and 11 analog inputs slas072c december 1992 revised march 1995 211 post office box 655303 ? dallas, texas 75265 parameter measurement information eoc c l = 50 pf 12 k w data out test point v cc r l = 2.18 k w c l = 100 pf 12 k w test point v cc r l = 2.18 k w figure 2. load circuits cs data out 2.4 v 0.4 v 90% 10% t pzh , t pzl t phz , t plz v il 2 v address t h(a) v il 2 v i/o clock address valid t su(a) v il figure 3. data out to hi-z voltage waveforms figure 4. address setup voltage waveforms last clock cs v il 2 v v il t su(cs) v il i/o clock t h(cs) first clock figure 5. cs and i/o clock voltage waveforms
tlv1543c, tlv1543m 3.3-v 10-bit analog-to-digital converters with serial control and 11 analog inputs slas072c december 1992 revised march 1995 212 post office box 655303 ? dallas, texas 75265 parameter measurement information 0.4 v 2.4 v 0.4 v 2.4 v 2 v v il i/o clock data out t t(i/o) v il 2 v t r(bus) , t f(bus) t d(i/o-data) t v i/o clock period t t(i/o) v il figure 6. data out and i/o clock voltage waveforms 10th clock v il 2.4 v 0.4 v t f(eoc) t d(i/o-eoc) i/o clock eoc figure 7. i/o clock and eoc voltage waveforms 0.4 v 2.4 v eoc t d(eoc-data) valid msb data out 0.4 v 2.4 v t r(eoc) figure 8. eoc and data out voltage waveforms
tlv1543c, tlv1543m 3.3-v 10-bit analog-to-digital converters with serial control and 11 analog inputs slas072c december 1992 revised march 1995 213 post office box 655303 ? dallas, texas 75265 ?????? ?????? ??? ??? ?? ?? ?? ?? ?? ?? ??? ??? ?? ?? ?? ?? access cycle b shift in new multiplexer address, simultaneously shift out previous conversion value sample cycle b a/d conversion interval initialize initialize msb lsb previous conversion data msb lsb b3 b2 b1 b0 c3 b9 a9 a8 a7 a6 a5 a4 a3 a2 a1 a0 hi-z state 1234 56 78910 1 i/o clock data out address cs eoc (see note a) figure 9. timing for 10-clock transfer using cs ??? ??? ?? ?? ?? ?? ?? ?? ??? ??? ?? ?? ?? ?? access cycle b shift in new multiplexer address, simultaneously shift out previous conversion value sample cycle b a/d conversion interval initialize msb lsb previous conversion data msb lsb b3 b2 b1 b0 c3 b9 a9 a8 a7 a6 a5 a4 a3 a2 a1 a0 low level 1234 56 78910 1 i/o clock data out address cs eoc initialize (see note a) must be high on power up figure 10. timing for 10-clock transfer not using cs note a: to minimize errors caused by noise at cs , the internal circuitry waits for a setup time plus two falling edges of the internal system clock after cs before responding to control input signals. no attempt should be made to clock in an address until the minimum cs setup time has elapsed.
tlv1543c, tlv1543m 3.3-v 10-bit analog-to-digital converters with serial control and 11 analog inputs slas072c december 1992 revised march 1995 214 post office box 655303 ? dallas, texas 75265 ??? ??? ?? ?? ?? ?? ?? ?? ??? ??? ?? ?? ?? ?? access cycle b shift in new multiplexer address, simultaneously shift out previous conversion value sample cycle b a/d conversion interval initialize msb lsb previous conversion data msb lsb b3 b2 b1 b0 c3 b9 a9 a8 a7 a6 a5 a4 a3 a2 a1 a0 1234 56 78910 1 i/o clock data out address cs eoc initialize ??? ??? ?? ?? ??? ??? low level hi-z see note c 11 16 (see note a) (see note a) figure 11. timing for 11- to 16-clock transfer using cs (serial transfer interval shorter than conversion) ??? ??? ?? ?? ?? ?? ??? ??? ?? ?? ?? ?? access cycle b shift in new multiplexer address, simultaneously shift out previous conversion value sample cycle b a/d conversion interval initialize msb lsb previous conversion data msb lsb b3 b2 b1 b0 c3 b9 a9 a8 a7 a6 a5 a4 a3 a2 a1 a0 low level 1234 56 78910 1 i/o clock data out address cs eoc initialize must be high on power up 14 15 16 see note b (see note a) ??? ??? figure 12. timing for 16-clock transfer not using cs (serial transfer interval shorter than conversion) notes: a. to minimize errors caused by noise at cs , the internal circuitry waits for a set up time plus two falling edges of the internal system clock after cs before responding to control input signals. no attempt should be made to clock in an address until the minimum cs setup time has elapsed. b. the first i/o clock must occur after the rising edge of eoc. c. a low-to-high transition of cs disables address and the i/o clock within a maximum of a setup time plus two falling edges of the internal system clock.
tlv1543c, tlv1543m 3.3-v 10-bit analog-to-digital converters with serial control and 11 analog inputs slas072c december 1992 revised march 1995 215 post office box 655303 ? dallas, texas 75265 ??? ??? ?? ?? ?? ?? ?? ?? ??? ??? ?? ?? ??? ??? access cycle b shift in new multiplexer address, simultaneously shift out previous conversion value sample cycle b a/d conversion interval initialize msb lsb previous conversion data msb lsb b3 b2 b1 b0 c3 b9 a9 a8 a7 a6 a5 a4 a3 a2 a1 a0 1234 56 78910 1 i/o clock data out address cs eoc initialize 11 ??? ??? ??? ??? ??? ??? hi-z state 16 see note b ??? ??? low level (see note a) figure 13. timing for 11- to 16-clock transfer using cs (serial transfer interval longer than conversion) ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ??? ??? shift in new multiplexer address, simultaneously shift out previous conversion value sample cycle b a/d conversion interval initialize msb lsb previous conversion data msb lsb b3 b2 b1 b0 c3 b9 a9 a8 a7 a6 a5 a4 a3 a2 a1 a0 1234 56 78910 1 i/o clock data out address cs eoc must be high on power up 14 15 16 see note c see note b low level access cycle b (see note a) figure 14. timing for 16-clock transfer not using cs (serial transfer interval longer than conversion) notes: a. to minimize errors caused by noise at cs , the internal circuitry waits for a set up time plus two falling edges of the internal system clock after cs before responding to control input signals. no attempt should be made to clock in an address until the minimum chip cs setup time has elapsed. b. the eleventh rising edge of the i/o clock sequence must occur before the conversion is complete to prevent losing serial interface synchronization. c. the i/o clock sequence is exactly 16 clock pulses long.
tlv1543c, tlv1543m 3.3-v 10-bit analog-to-digital converters with serial control and 11 analog inputs slas072c december 1992 revised march 1995 216 post office box 655303 ? dallas, texas 75265 application information 1000000000 0111111111 0000000010 0000000001 0000000000 1111111110 0 0.0096 2.4528 2.4576 2.4624 digital output code 1000000001 1111111101 1111111111 4.9056 4.9104 4.9152 512 511 2 1 0 1022 step 513 1021 1023 0.0024 v i analog input voltage v v zt = v zs + 1/2 lsb v zs see notes a and b 4.9080 0.0048 v ft = v fs 1/2 lsb v fs notes: a. this curve is based on the assumption that v ref + and v ref have been adjusted so that the voltage at the transition from digital 0 to 1 (v zt ) is 0.0024 v and the transition to full scale (v ft ) is 4.908 v. 1 lsb = 4.8 mv. b. the full-scale value (v fs ) is the step whose nominal midstep value has the highest absolute value. the zero-scale value (v zs ) is the step whose nominal midstep value equals zero. figure 15. ideal conversion characteristics processor control circuit analog inputs a0 a1 a2 a3 a4 a5 a6 a7 a8 a9 a10 i/o clock cs address data out eoc ref + ref gnd tlv1543 to source ground 3-v dc regulated 1 2 3 4 5 6 7 8 9 11 12 15 18 17 16 19 14 13 10 figure 16. serial interface
tlv1543c, tlv1543m 3.3-v 10-bit analog-to-digital converters with serial control and 11 analog inputs slas072c december 1992 revised march 1995 217 post office box 655303 ? dallas, texas 75265 application information simplified analog input analysis using the equivalent circuit in figure 17, the time required to charge the analog input capacitance from 0 to v s within 1/2 lsb can be derived as follows: the capacitance charging voltage is given by v c = v s 1 e t c /r t c i ( ) (1) where r t = r s + r i the final voltage to 1/2 lsb is given by (2) v c (1/2 lsb) = v s (v s /2048) equating equation 1 to equation 2 and solving for time t c gives v s (v s /2048) = v s 1 e ( ) (3) t c /r t c i and t c (1/2 lsb) = r t c i ln(2048) (4) therefore, with the values given the time for the analog input signal to settle is (5) t c (1/2 lsb) = (r s + 1 k w ) 60 pf ln(2048) this time must be less than the converter sample time shown in the timing diagrams. r s r i v s v c 50 pf max 1 k w max driving source 2 tlv1543 c i v i v i = input voltage at a0 a10 v s = external driving source voltage r s = source resistance r i = input resistance c i = input capacitance 2 driving source requirements: ? noise and distortion for the source must be equivalent to the resolution of the converter. ? r s must be real at the input frequency. figure 17. equivalent input circuit including the driving source
tlv1543c, tlv1543m 3.3-v 10-bit analog-to-digital converters with serial control and 11 analog inputs slas072c december 1992 revised march 1995 218 post office box 655303 ? dallas, texas 75265
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