View PAMC1035D_9045890.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

an important notice at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. advance information for pre-production products; subject to change without notice. amc1035 sbas837 ? august 2018 amc1035 delta-sigma modulator with bipolar input of 1 v and reference output of 2.5 v 1 1 features 1 ? delta-sigma modulator optimized for voltage and temperature sensing: ? 1-v input voltage range ? high input resistance: 1 g (typ) ? integrated 2.5-v, 5-ma reference for ratiometric measurement ? excellent dc performance: ? offset error: 0.5 mv (max) ? offset drift: 8 v/ c (max) ? gain error: 0.2% (max) ? gain drift: 40 ppm/ c (max) ? selectable manchester encoded or uncoded bitstream output ? fully specified over the extended industrial temperature range: ? 40 c to +125 c 2 applications ? ac voltage and temperature sensing in industrial applications: ? motor drives ? photovoltaic inverters ? uninterruptible power supplies ? industrial transport systems 3 description the amc1035 is a precision, delta-sigma ( ) modulator that operates from a single 3.0-v to 5.5-v supply and with an externally supplied clock signal in the range of 9 mhz to 21 mhz. the differential 1-v input structure of the device is optimized for high noise environments typical for industrial applications. select the output bitstream of the amc1035 to be manchester coded to prevent setup and hold time requirement considerations of the receiving device and reduce overall circuit layout efforts. when used with a digital filter (such as integrated in the tms320f28004x , tms320f2807x or tms320f2837x microcontroller families) to decimate the output bitstream, the device can achieve 16 bits of resolution with a dynamic range of 86 db at a data rate of 82 ksps. the internal reference source of the amc1035 supports ratiometric circuit architecture to minimize the negative impact of the supply voltage variation and temperature drift on the accuracy of the measurement. the amc1035 can also be used for ac power line voltage sensing with a digital isolator and isolated power supply. device information (1) part number package body size (nom) amc1035 soic (8) 4.9 mm 3.9 mm (1) for all available packages, see the orderable addendum at the end of the datasheet. simplified block diagram voltage reference dout clkin gnd vdd manchester coding ? -modulator ainp refout mce ainn advance information tools & software technical documents ordernow productfolder support &community
2 amc1035 sbas837 ? august 2018 www.ti.com product folder links: amc1035 submit documentation feedback copyright ? 2018, texas instruments incorporated table of contents 1 features .................................................................. 1 2 applications ........................................................... 1 3 description ............................................................. 1 4 revision history ..................................................... 2 5 pin configuration and functions ......................... 3 6 specifications ......................................................... 4 6.1 absolute maximum ratings ...................................... 4 6.2 esd ratings .............................................................. 4 6.3 recommended operating conditions ....................... 4 6.4 thermal information .................................................. 5 6.5 electrical characteristics ........................................... 5 6.6 switching characteristics .......................................... 7 7 detailed description .............................................. 8 7.1 overview ................................................................... 8 7.2 functional block diagram ......................................... 8 7.3 feature description ................................................... 9 7.4 device functional modes ........................................ 12 8 application and implementation ........................ 13 8.1 application information ............................................ 13 8.2 typical applications ................................................ 14 9 power supply recommendations ...................... 17 10 layout ................................................................... 18 10.1 layout guidelines ................................................. 18 10.2 layout example .................................................... 18 11 device and documentation support ................. 19 11.1 documentation support ....................................... 19 11.2 receiving notification of documentation updates 19 11.3 community resources .......................................... 19 11.4 trademarks ........................................................... 19 11.5 electrostatic discharge caution ............................ 19 11.6 glossary ................................................................ 19 12 mechanical, packaging, and orderable information ........................................................... 19 4 revision history note: page numbers for previous revisions may differ from page numbers in the current version. date revision notes august 2018 * initial release. advance information
3 amc1035 www.ti.com sbas837 ? august 2018 product folder links: amc1035 submit documentation feedback copyright ? 2018, texas instruments incorporated 5 pin configuration and functions d package 8-pin soic top view pin functions pin i/o description no. name 1 mce i manchester coding enabled, active high, with internal pulldown resistor (typical value: 200 k ). the polarity of this signal must not be changed when the clock signal is applied. 2 ainp i noninverting analog input. 3 ainn i inverting analog input. 4 refout o reference output: 2.5 v nominal, maximum 5-ma sink and source capability. 5 gnd ? ground reference. 6 dout o modulator bitstream data output, updated with the rising edge of the clock signal present on clkin. this pin is a manchester coded output if mce is pulled high. use the rising edge of the clock to latch the modulator bitstream at the input of the digital filter device. 7 clkin i modulator clock input: 9 mhz to 21 mhz with an internal pulldown resistor (typical value: 200 k ). the clock signal must be applied continuously for proper device operation; see the clock input section for additional details. 8 vdd ? power supply, 3.0 v to 5.5 v. see the power supply recommendations section for decoupling recommendations. advance information 1 mce 8 vdd 2 ainp 7 clkin 3 ainn 6 dout 4 refout 5 gnd not to scale
4 amc1035 sbas837 ? august 2018 www.ti.com product folder links: amc1035 submit documentation feedback copyright ? 2018, texas instruments incorporated (1) stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratings only, and do not imply functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions . exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. 6 specifications 6.1 absolute maximum ratings see (1) min max unit supply voltage, vdd to gnd ? 0.3 6.5 v analog input voltage at ainp, ainn gnd ? 5 vdd + 0.5 v analog output voltage at refout gnd ? 0.5 vdd + 0.5 v digital input voltage at clkin or mce gnd ? 0.5 vdd + 0.5 v digital output voltage at dout gnd ? 0.5 vdd + 0.5 v input current to any pin except supply pins ? 10 10 ma junction temperature, t j 150 c storage temperature, t stg ? 65 150 c (1) jedec document jep155 states that 500-v hbm allows safe manufacturing with a standard esd control process. (2) jedec document jep157 states that 250-v cdm allows safe manufacturing with a standard esd control process. 6.2 esd ratings value unit v (esd) electrostatic discharge human-body model (hbm), per ansi/esda/jedec js-001 (1) 2000 v charged-device model (cdm), per jedec specification jesd22-c101 (2) 1000 (1) steady-state voltage supported by the device in case of a system failure. see specified common-mode input voltage v cm for normal operation. observe analog input voltage range as specified in absolute maximum ratings table. 6.3 recommended operating conditions over operating ambient temperature range (unless otherwise noted) min nom max unit power supply vdd supply voltage vdd to gnd 3.0 5.0 5.5 v analog input v clipping differential input voltage before clipping output v in = v ainp ? v ainn 1.25 v v fsr specified linear differential full-scale voltage v in = v ainp ? v ainn ? 1 1 v absolute common-mode input voltage (1) (v ainp + v ainn ) / 2 to gnd ? 2 vdd v v cm operating common-mode input voltage (v ainp + v ainn ) / 2 to gnd, 3.0 v vdd 4.5 v ? 0.65 vdd ? 2.35 v (v ainp + v ainn ) / 2 to gnd, 4.5 v vdd 5.5 v ? 0.65 2.15 v digital input input voltage v mce or v clkin to gnd gnd vdd v temperature range t a operating ambient temperature ? 40 125 c advance information
5 amc1035 www.ti.com sbas837 ? august 2018 product folder links: amc1035 submit documentation feedback copyright ? 2018, texas instruments incorporated (1) for more information about traditional and new thermal metrics, see the semiconductor and ic package thermal metrics application report. 6.4 thermal information thermal metric (1) amc1035 unit d (soic) 8 pins r ja junction-to-ambient thermal resistance 120 c/w r jc(top) junction-to-case (top) thermal resistance 52 c/w r jb junction-to-board thermal resistance 61 c/w jt junction-to-top characterization parameter 10 c/w jb junction-to-board characterization parameter 60 c/w r jc(bot) junction-to-case (bottom) thermal resistance n/a c/w (1) the common-mode overvoltage detection level has a typical hysteresis of 90 mv. (2) integral nonlinearity is defined as the maximum deviation from a straight line passing through the end-points of the ideal adc transfer function expressed as number of lsbs or as a percent of the specified linear full-scale range fsr. (3) offset error drift is calculated using the box method, as described by the following equation: . (4) gain error drift is calculated using the box method, as described by the following equation: . 6.5 electrical characteristics minimum and maximum specifications apply from t a = ? 40 c to +125 c, vdd = 3.0 v to 5.5 v, ainp = ? 1 v to 1 v, ainn = gnd, and sinc 3 filter with osr = 256 (unless otherwise noted); typical specifications are at t a = 25 c, clkin = 20 mhz, and vdd = 3.3 v parameter test conditions min typ max unit analog inputs v cmuv negative common-mode undervoltage detection level (1) (v ainp + v ainn ) / 2 0 v ? 1.05 v (v ainp + v ainn ) / 2 = 0 v ? 1.7 v v cmov positive common-mode overvoltage detection level (1) 3.0 v vdd 3.6 v, (v ainp + v ainn ) / 2 0 v, vdd ? 2.25 v 3.0 v vdd 3.6 v, (v ainp + v ainn ) / 2 = 0 v vdd ? 1.15 v 4.5 v vdd 5.5 v, (v ainp + v ainn ) / 2 0 v 2.3 v 4.5 v vdd 5.5 v, (v ainp + v ainn ) / 2 = 0 v 2.9 v r in single-ended input resistance ainn = gnd 1 g r ind differential input resistance 1 g i ib input bias current ainp = ainn = gnd, (i ainp + i ainn ) / 2 ? 2.5 na tci ib input bias current thermal drift ainp = ainn = gnd, (i ainp + i ainn ) / 2 10 pa/ c i io input offset current i io = i ainp ? i ainn 1 na dc accuracy dnl differential nonlinearity resolution: 16 bits ? 0.99 0.99 lsb inl integral nonlinearity (2) resolution: 16 bits ? 12 3 12 lsb e o offset error initial, at t a = 25 c, ainp = ainn = gnd ? 0.5 0.01 0.5 mv tce o offset error thermal drift (3) ? 8 8 v/ c e g gain error initial, at t a = 25 c ? 0.25% 0.01% 0.25% tce g gain error thermal drift (4) ? 40 20 40 ppm/ c temprange value value tce min max o advance information 6 10 ) ( u ? ? 1 ? u temprange value value value ppm tce min max g
6 amc1035 sbas837 ? august 2018 www.ti.com product folder links: amc1035 submit documentation feedback copyright ? 2018, texas instruments incorporated electrical characteristics (continued) minimum and maximum specifications apply from t a = ? 40 c to +125 c, vdd = 3.0 v to 5.5 v, ainp = ? 1 v to 1 v, ainn = gnd, and sinc 3 filter with osr = 256 (unless otherwise noted); typical specifications are at t a = 25 c, clkin = 20 mhz, and vdd = 3.3 v parameter test conditions min typ max unit (5) capacitive load with a value 1nf requires series resistor to be connected to the refout pin. ac accuracy snr signal-to-noise ratio f in = 1 khz 86 db sinad signal-to-noise + distortion f in = 1 khz 86 db thd total harmonic distortion f in = 1 khz ? 95 db sfdr spurious-free dynamic range f in = 1 khz ? 92 db reference output v refout reference output voltage initial, at t a = 25 c, no load 2.495 2.5 2.505 v tcv refout reference output voltage drift ? 50 10 50 ppm/ c psrr power-supply rejection ratio ? 40 c t a 85 c ? 300 15 300 v/v ? 40 c t a 125 c ? 700 15 700 i refout reference output current c load < 1 nf (5) ? 5 5 ma load regulation load to gnd or vdd 0.15 0.35 mv/ma i sc short-circuit current refout to gnd ? 18 ma refout to vdd 20 digital input (cmos logic with schmitt-trigger) i in input current gnd v in vdd 0 7 a c in input capacitance 4 pf v ih high-level input voltage 0.7 vdd vdd + 0.3 v v il low-level input voltage ? 0.3 0.3 vdd v digital output: cmos c load output load capacitance f clkin = 21 mhz 15 30 pf v oh high-level output voltage i oh = ? 20 a vdd ? 0.1 v i oh = ? 4 ma vdd ? 0.4 v ol low-level output voltage i ol = 20 a 0.1 v i ol = 4 ma 0.4 power supply vdd supply voltage 3.0 5.0 5.5 v i vdd high-side supply current 3.0 v vdd 3.6 v, i refout = 0 ma, mce = 0, c load = 15 pf 5.5 ma 3.0 v vdd 3.6 v, i refout = 0 ma, mce = 1, c load = 15 pf 4.6 4.5 v vdd 5.5 v, i refout = 0 ma, mce = 0, c load = 15 pf 6.5 10 4.5 v vdd 5.5 v, i refout = 0 ma, mce = 1, c load = 15 pf 5.6 11 advance information
7 amc1035 www.ti.com sbas837 ? august 2018 product folder links: amc1035 submit documentation feedback copyright ? 2018, texas instruments incorporated 6.6 switching characteristics over operating free-air temperature range (unless otherwise noted) parameter test conditions min typ max unit f clkin clkin clock frequency mce = 0 9 20 21 mhz mce = 1 9 10 11 duty cycle clkin clock duty cycle mce = 0 42% 50% 58% mce = 1 45% 50% 55% t h1 dout hold time after rising edge of clkin mce = 0, c load = 15 pf 4.5 ns t h2 dout hold time after rising edge of clkin mce = 1, c load = 15 pf 5 17 ns t h3 dout hold time after falling edge of clkin mce = 1, c load = 15 pf 11 25 ns t d1 rising edge of clkin to dout valid delay mce = 0, c load = 15 pf 23 ns t d2 rising edge of clkin to dout valid delay mce = 1, c load = 15 pf 9 24 ns t d3 falling edge of clkin to dout valid delay mce = 1, c load = 15 pf 29 31 ns t astart analog startup time vdd step to 3.0 v, 0.1% settling, clkin applied 0.2 ms figure 1. digital interface timing figure 2. device startup timing clkin dout (mce = 0) t clkin t high t low t d1 t h1 t r / t f dout (mce = 1) t d2 t r / t f t d3 t h2 t h3 advance information clkin dout bitstream not valid (analog settling) vdd ... valid bitstream t astart
8 amc1035 sbas837 ? august 2018 www.ti.com product folder links: amc1035 submit documentation feedback copyright ? 2018, texas instruments incorporated 7 detailed description 7.1 overview the differential analog input (comprised of input signals ainp and ainn) of the amc1035 is a chopper-stabilized buffer, followed by the switched-capacitor input of a second-order, delta-sigma ( ) modulator stage that digitizes the input signal into a 1-bit output stream. the data output dout of the converter provides a stream of digital ones and zeros that is synchronous to the externally-provided clock source at the clkin pin with a frequency in the range of 9 mhz to 21 mhz. the time average of this serial bitstream output is proportional to the analog input voltage. the functional block diagram section shows a detailed block diagram of the amc1035. the 1-g input resistance of the analog input stage supports low gain-error signal sensing in high-voltage applications using resistive dividers. the external clock input simplifies the synchronization of multiple measurement channels on the system level. the extended frequency range of up to 21 mhz supports higher performance levels compared to the other solutions available on the market. 7.2 functional block diagram voltage reference dout clkin gnd vdd manchester coding ? -modulator ainp refout mce ainn advance information
9 amc1035 www.ti.com sbas837 ? august 2018 product folder links: amc1035 submit documentation feedback copyright ? 2018, texas instruments incorporated 7.3 feature description 7.3.1 analog input the amc1035 incorporates front-end circuitry that contains a buffered sampling stage, followed by a modulator. to support a bipolar input range, the device uses a charge pump that allows single-supply operation to simplify the overall system design and minimize the circuit cost. for reduced offset and offset drift, the input buffer is chopper-stabilized with the switching frequency set at f clkin / 32. figure 3 shows the spur created by the switching frequency. sinc 3 filter, osr = 2, f clkin = 20 mhz, f in = 1 khz figure 3. quantization noise shaping there are two restrictions on the analog input signals (ainp and ainn). first, if the input voltage exceeds the range agnd ? 5 v to avdd + 0.5 v, the input current must be limited to 10 ma because the device input electrostatic discharge (esd) diodes turn on. in addition, the linearity and noise performance of the device are ensured only when the differential analog input voltage remains within the specified linear full-scale range (fsr), that is 1 v, and within the specified input common-mode range. frequency (khz) magnitude (db) 0.1 1 10 100 1000 10000 -160 -140 -120 -100 -80 -60 -40 -20 0 d007 advance information
10 amc1035 sbas837 ? august 2018 www.ti.com product folder links: amc1035 submit documentation feedback copyright ? 2018, texas instruments incorporated feature description (continued) 7.3.2 modulator the modulator implemented in the amc1035 (such as the one conceptualized in figure 4 ) is a second-order, switched-capacitor, feed-forward modulator. the analog input voltage v in and the output v 5 of the 1-bit digital-to-analog converter (dac) are differentiated, providing an analog voltage v 1 at the input of the first integrator stage. the output of the first integrator feeds the input of the second integrator stage, resulting in output voltage v 3 that is differentiated with the input signal v in and the output of the first integrator v 2 . depending on the polarity of the resulting voltage v 4 , the output of the comparator is changed. in this case, the 1-bit dac responds on the next clock pulse by changing the associated analog output voltage v 5 , causing the integrators to progress in the opposite direction and forcing the value of the integrator output to track the average value of the input. figure 4. block diagram of a second-order modulator as depicted in figure 3 , the modulator shifts the quantization noise to high frequencies. therefore, use a low- pass digital filter at the output of the device to increase the overall performance. this filter is also used to convert from the 1-bit data stream at a high sampling rate into a higher-bit data word at a lower rate (decimation). ti's microcontroller families tms320f28004x , tms320f2807x , and tms320f2837x offer a suitable programmable, hardwired filter structure termed a sigma-delta filter module (sdfm) optimized for usage with the amc1035. also, sd24_b converters on the msp430f677x microcontrollers offer a path to directly access the integrated sinc-filters for a simple system-level solution for multichannel, isolated current sensing. an additional option is to use a suitable application-specific device, such as the amc1210 (a four-channel digital sinc filter). alternatively, a field-programmable gate array (fpga) can be used to implement the filter. 7.3.3 clock input the amc1035 system clock is provided externally at the clkin pin. the clock signal can be applied and paused at any time. when the clock signal is paused, the modulator stops the analog signal conversion and the digital output signal remains frozen in the last logic state. when the clock signal is applied again after a pause, the internal analog circuitry biasing must settle for proper device performance. in this case, consider the t astart specification in the switching characteristics table. v in integrator 1 integrator 2 0 v dac v 1 v 2 v 4 v 5 v 3 cmp f clkin advance information
11 amc1035 www.ti.com sbas837 ? august 2018 product folder links: amc1035 submit documentation feedback copyright ? 2018, texas instruments incorporated feature description (continued) 7.3.4 digital output a differential input signal of 0 v ideally produces a stream of ones and zeros that are high 50% of the time. a differential input of 1 v produces a stream of ones and zeros that are high 90% of the time. with 16 bits of resolution, that percentage ideally corresponds to code 58982 (an unsigned code). a differential input of ? 1 v produces a stream of ones and zeros that are high 10% of the time and ideally results in code 6553 with 16-bit resolution. these input voltages are also the specified linear range of the amc1035 with performance as specified in this document. if the input voltage value exceeds these range, the output of the modulator shows nonlinear behavior when the quantization noise increases. the output of the modulator clips with a stream of only zeros with an input less than or equal to ? 1.25 v or with a stream of only ones with an input greater than or equal to 1.25 v. in this case, however, the amc1035 generates a single 1 (if the input is at negative full-scale) or 0 every 128 clock cycles to indicate proper device function (see the fail-safe output section for more details). figure 5 shows the input voltage versus the output modulator signal. figure 5. analog input versus the amc1035 modulator output equation 1 calculates the density of ones in the output bitstream for any input voltage value (with the exception of a full-scale input signal, as described in the output behavior in case of a full-scale input section): (1) the modulator bitstream on the dout pin changes with the rising edge of the clock signal applied on the clkin pin. use the rising edge of the clock to latch the modulator bitstream at the input of the digital filter device. 7.3.5 manchester coding feature the amc1035 offers the ieee 802.3-compliant manchester coding feature that generates at least one transition per bit to support clock signal recovery from the bitstream. the manchester coding combines the clock and data information using exclusive or (xor) logical operation that results in a bitstream free of dc components. figure 6 shows the resulting bitstream from this coding. the duty cycle of the manchester encoded bitstream depends on the duty cycle of the input clock clkin. to enable manchester coding on the amc1035, pull the input pin mce high. figure 6. manchester coded output of the amc1035 clock uncoded bitstream machester coded bitstream 1 0 1 0 1 1 1 0 0 1 1 0 0 0 1 advance information modulator output analog input +fs (analog input)- fs (analog input) in clipping clipping v v 2 v u
12 amc1035 sbas837 ? august 2018 www.ti.com product folder links: amc1035 submit documentation feedback copyright ? 2018, texas instruments incorporated 7.4 device functional modes the amc1035 is operational when the power supply vdd and clock signal clkin are applied, as specified in the recommended operating conditions and switching characteristics tables. 7.4.1 output behavior in case of a full-scale input if a full-scale input signal is applied to the amc1035 (that is, v in v clipping ), the device generates a single one or zero every 128 bits at dout, as shown in figure 7 , depending on the actual polarity of the signal being sensed. this feature is also supported with manchester-coded output and allows full-scale and invalid input signals to be identified as described in the fail-safe output section and can be used for advanced system-level diagnostics. figure 7. overrange output of the amc1035 7.4.2 fail-safe output figure 8 shows that if the common-mode voltage of the input reaches or exceeds the specified common-mode undervoltage, v cmuv , or overvoltage detection level, v cmov as defined in the electrical characteristics table, the dout of the amc1035 is held at steady-state high. figure 8. fail-safe output of the amc1035 clkin dout (mce = 0) (vinp t vinn) ? t 1.25 v (vinp t vinn) ? 1.25 v ... ... ... ... ... ... 127 clkin cycles 127 clkin cycles dout (mce = 0) ... dout (mce = 1) dout (mce = 1) ... ... ... advance information dout (mce = 0) clkin v cmov g s cm g s cmuv v cmuv < v cm < v cmov v cm dout (mce = 1)
13 amc1035 www.ti.com sbas837 ? august 2018 product folder links: amc1035 submit documentation feedback copyright ? 2018, texas instruments incorporated 8 application and implementation note information in the following applications sections is not part of the ti component specification, and ti does not warrant its accuracy or completeness. ti ? s customers are responsible for determining suitability of components for their purposes. customers should validate and test their design implementation to confirm system functionality. 8.1 application information 8.1.1 digital filter usage the modulator generates a bitstream that is processed by a digital filter to obtain a digital word similar to a conversion result of a conventional analog-to-digital converter (adc). equation 2 shows a sinc 3 -type filter, which is a very simple filter, built with minimal effort and hardware: (2) this filter provides the best output performance at the lowest hardware size (count of digital gates) for a second- order modulator. all the characterization in this document is also done with a sinc 3 filter with an oversampling ratio (osr) of 256 and an output word width of 16 bits. an example code for implementing a sinc 3 filter in an fpga is discussed in the combining the ads1202 with an fpga digital filter for current measurement in motor control applications application note , available for download at www.ti.com . advance information 3 osr 1 1 z h z 1 z ? ? ? 1
14 amc1035 sbas837 ? august 2018 www.ti.com product folder links: amc1035 submit documentation feedback copyright ? 2018, texas instruments incorporated 8.2 typical applications 8.2.1 voltage sensing modulators are widely used in frequency inverter designs because of their high ac and dc performance. frequency inverters are critical parts of industrial motor drives, photovoltaic inverters (string and central inverters), uninterruptible power supplies (ups), and other industrial applications. figure 9 shows a simplified schematic of a motor drive application with the amc1035 used for the dc-link and output phase voltage sensing. in this example, all resistive dividers reference to the negative dc-link voltage that is also used as a ground reference point for the microcontroller. an additional fifth amc1035 can be used for temperature sensing of the insulated-gate bipolar transistor (igbt) module; see the igbt temperature sensing section for more details. current feedback is performed with shunt resistors (r shunt ) and ti's amc1306m25 isolated modulators. depending on the system design, either all three or only two motor phase currents are sensed. depending on the overall digital processing power requirements and with a total of eight modulator bitstreams to be processed by the mcu, a derivate from either the low-cost single-core tms320f2807x or the dual-core tms320f2837x families can be used in this application. figure 9. the amc1035 in a frequency inverter application +v bus uv w motor -v bus r shunt r shunt r shunt r ac1 r ac2 r ac3 r ac1 r ac2 r ac3 r dc1 r dc2 r dc3 r ac1 r ac2 r ac3 dout clkin dvdd dgnd agnd inn inp avdd amc1306m25 3.3v iso 3.3 v r flt r flt c flt dout clkin vdd gnd refout ainn ainp mce amc1035 3.3 v r flt r flt c flt dout clkin dvdd dgnd agnd inn inp avdd amc1306m25 3.3 v iso 3.3 v r flt r flt c flt dout clkin vdd gnd refout ainn ainp mce amc1035 3.3 v r flt r flt c flt dout clkin dvdd dgnd agnd inn inp avdd amc1306m25 3.3 v iso 3.3 v r flt r flt c flt dout clkin vdd gnd refout ainn ainp mce amc1035 3.3 v r flt r flt c flt dout clkin vdd gnd refout ainn ainp mce amc1035 3.3 v r flt r flt c flt pwmx tms320f28x7x cdclvc1106 clkin sd1_d1 sd1_d2 sd1_d3 sd1_d4 sd1_c1 sd1_c2 sd1_c3 sd1_c4 sd2_d1 sd2_d2 sd2_d3 sd2_d4 sd2_c1 sd2_c2 sd2_c3 sd2_c4 sdfm1 sdfm2 y0 y1 y2 1g y2 y4 y5 3.3 v i dc v bus i ac advance information
15 amc1035 www.ti.com sbas837 ? august 2018 product folder links: amc1035 submit documentation feedback copyright ? 2018, texas instruments incorporated typical applications (continued) 8.2.1.1 design requirements table 1 lists the parameters for this typical application. table 1. design requirements parameter value supply voltage 3.3 v voltage drop across the sensing resistor r dc1 for a linear response 1 v (maximum) voltage drop across the sensing resistors r acx for a linear response 1 v (maximum) current through the sensing resistors r acx 100 v (maximum) 8.2.1.2 detailed design procedure use ohm's law to calculate the minimum total resistance of the resistive dividers to limit the cross current to the desired values: ? for the voltage sensing on the dc bus: r dc1 + r dc2 + r dc3 = v bus / i dc ? for the voltage sensing on the output phases u, v, and w: r ac1 + r ac2 + r ac3 = v phase (max) / i ac consider the following two restrictions to choose the proper value of the resistors r dc3 and r ac3 : ? the voltage drop caused by the nominal voltage range of the system must not exceed the recommended input voltage range of the amc1035: v xc3 v fsr ? the voltage drop caused by the maximum allowed system overvoltage must not exceed the input voltage that causes a clipping output: v xc3 v clipping use similar approach for calculation of the shunt resistor values r shunt and refer to the datasheet of the amc1306m25 for further details. table 2 lists examples of nominal e96-series (1% accuracy) resistor values for systems using 600 v and 800 v on the dc bus. table 2. resistor value examples for dc bus sensing parameter 600-v dc bus 800-v dc bus resistive divider resistor r dc1 3.01 m 4.22 m resistive divider resistor r dc2 3.01 m 4.22 m sense resistor r dc3 10 k 10.5 k resulting current through resistive divider i dc 99.5 a 94.7 a resulting voltage drop on sense resistor v rdc3 0.995 v 0.994 v table 3 lists examples of nominal e96-series (1% accuracy) resistor values for systems using 230 v and 690 v on the output phases. table 3. resistor value examples for output phase voltage sensing parameter 400-v ac phase 690-v ac phase resistive divider resistor r ac1 2.0 m 3.48 m resistive divider resistor r ac2 2.0 m 3.48 m sense resistor r ac3 10.0 k 10.0 k resulting current through resistive divider i ac 99.8 a 99.0 a resulting voltage drop on sense resistor v rac3 0.998 v 0.990 v advance information
16 amc1035 sbas837 ? august 2018 www.ti.com product folder links: amc1035 submit documentation feedback copyright ? 2018, texas instruments incorporated use a power supply with a nominal voltage of 3.3 v to directly connect all modulators to the microcontroller. for modulator output bitstream filtering, a device from ti's tms320f2807x family of low-cost microcontrollers (mcus) or tms320f2837x family of dual-core mcus is recommended. these mcu families support up to eight channels of dedicated hardwired filter structures called sigma-delta filter modules (sdfms) that significantly simplify system level design by offering two filtering paths per channel: one providing high accuracy results for the control loop and one that offers a fast response path for overcurrent detection. use one of the pulse-width modulation (pwm) sources inside the mcu to generate the clock for the modulators and for easy synchronization of all feedback signals and the switching control of the gate drivers. figure 9 uses a clock buffer to distribute the clock reference signal generated on one of the pwm outputs of the mcu (called pwmx in figure 9 ) to all modulators used in the circuit and as a reference for the digital filters in the mcu. in this example, ti's cdclvc1106 is used for this purpose. each cdclvc1006 output can drive a load of 8 f that is sufficient to drive up to two modulator and up to four sdfm clock inputs. 8.2.2 igbt temperature sensing the high input impedance of the amc1035 is optimized for usage in voltage-sensing applications. additionally, the internal voltage reference supports temperature sensing using a positive temperature coefficient (ptc) or a negative temperature coefficient (ntc) sensor often integrated in the igbt module. the same reference is internally used by the modulator, resulting in a ratiometric system solution that minimizes the overall temperature drift of the sensing path. figure 10 shows a simplified schematic of the amc1035 used for temperature sensing of the igbt module. figure 10. using the amc1035 for temperature sensing 8.2.3 what to do and what not to do do not leave the inputs of the amc1035 unconnected (floating) when the device is powered up. if both modulator inputs are left floating, the input bias current drives these inputs to the output common-mode of the analog front- end of approximately 2 v. if that voltage is above the specified input common-mode range, the front gain diminishes and the modulator outputs a bitstream resembling a zero input differential voltage. dout clkin gnd vdd ainp refout mce ainn t igbt module digital filter amc1035 3.3 v sd-cx sd-dx pwmx tms320f28x7x advance information
17 amc1035 www.ti.com sbas837 ? august 2018 product folder links: amc1035 submit documentation feedback copyright ? 2018, texas instruments incorporated 9 power supply recommendations in a typical frequency-inverter application, the high-side power supply (avdd) for the device is directly derived from the floating power supply of the upper gate driver. for lowest system-level cost, a zener diode can be used to limit the voltage to 5 v or 3.3 v ( 10%). alternatively a low-cost low-drop regulator (ldo), for example the lm317-n , can be used to adjust the supply voltage level and minimize noise on the power-supply node. a low- esr decoupling capacitor of 0.1 f is recommended for filtering this power-supply path. place this capacitor (c2 in figure 11 ) as close as possible to the avdd pin of the amc1035 for best performance. if better filtering is required, an additional 10- f capacitor can be used. the floating ground reference (agnd) is derived from the end of the shunt resistor that is connected to the negative input (ainn) of the device. if a four-pin shunt is used, the device inputs are connected to the inner leads and agnd is connected to one of the outer leads of the shunt. for decoupling of the power supply, a 0.1- f capacitor is recommended to be placed as close to the vdd pin of the amc1035 as possible, as shown in figure 11 , followed by an additional capacitor in the range of 1 f to 10 f. figure 11. decoupling the amc1035 advance information vinp vinn mce amc1035 r 3 r 2 r 1 vdd gnd 3.0 v to 3.6 v c1 0.1 f c2 2.2 f sd-cx sd-dx tms320f2837x pwmx dout clkin ? modulator phase x optional anti-aliasing filter
18 amc1035 sbas837 ? august 2018 www.ti.com product folder links: amc1035 submit documentation feedback copyright ? 2018, texas instruments incorporated 10 layout 10.1 layout guidelines figure 12 shows two layout recommendations for designs based on 1206-smd or 0603-smd size decoupling capacitors placed as close as possible to the amc1035. for best performance, place the amc1035 as close as possible to the source of the analog signal to be converted and keep the layout of the vinp and vinn traces symmetrical. 10.2 layout example figure 12. recommended layout of the amc1035 advance information amc1035 legend copper pour and traces via to ground plane via to supply plane to sensor mce vinp vinn refout vdd dout clkin gnd 0.1 f 1206 2.2 f 1206 to digital filter amc1035 to sensor mce vinp vinn refout vdd dout clkin gnd to digital filter 0.1 f 0603 2.2 f 0603
19 amc1035 www.ti.com sbas837 ? august 2018 product folder links: amc1035 submit documentation feedback copyright ? 2018, texas instruments incorporated 11 device and documentation support 11.1 documentation support 11.1.1 related documentation for related documentation see the following: ? amc1210 quad digital filter for 2nd-order delta-sigma modulator ? amc1306x small, high-precision, reinforced isolated delta-sigma modulators with high cmti ? msp430f677x polyphase metering socs ? tms320f28004x piccolo ? microcontrollers ? tms320f2807x piccolo ? microcontrollers ? tms320f2837xd dual-core delfino ? microcontrollers ? combining the ads1202 with an fpga digital filter for current measurement in motor control applications ? cdclvc11xx 3.3-v and 2.5-v lvcmos high-performance clock buffer family ? lm117, lm317-n wide temperature three-pin adjustable regulator 11.2 receiving notification of documentation updates to receive notification of documentation updates, navigate to the device product folder on ti.com. in the upper right corner, click on alert me to register and receive a weekly digest of any product information that has changed. for change details, review the revision history included in any revised document. 11.3 community resources the following links connect to ti community resources. linked contents are provided "as is" by the respective contributors. they do not constitute ti specifications and do not necessarily reflect ti's views; see ti's terms of use . ti e2e ? online community ti's engineer-to-engineer (e2e) community. created to foster collaboration among engineers. at e2e.ti.com, you can ask questions, share knowledge, explore ideas and help solve problems with fellow engineers. design support ti's design support quickly find helpful e2e forums along with design support tools and contact information for technical support. 11.4 trademarks e2e is a trademark of texas instruments. all other trademarks are the property of their respective owners. 11.5 electrostatic discharge caution this integrated circuit can be damaged by esd. texas instruments recommends that all integrated circuits be handled with appropriate precautions. failure to observe proper handling and installation procedures can cause damage. esd damage can range from subtle performance degradation to complete device failure. precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. 11.6 glossary slyz022 ? ti glossary . this glossary lists and explains terms, acronyms, and definitions. 12 mechanical, packaging, and orderable information the following pages include mechanical, packaging, and orderable information. this information is the most current data available for the designated devices. this data is subject to change without notice and revision of this document. for browser-based versions of this data sheet, refer to the left-hand navigation. advance information
package option addendum www.ti.com 22-sep-2018 addendum-page 1 packaging information orderable device status (1) package type package drawing pins package qty eco plan (2) lead/ball finish (6) msl peak temp (3) op temp (c) device marking (4/5) samples PAMC1035D active soic d 8 75 tbd call ti call ti -40 to 125 (1) the marketing status values are defined as follows: active: product device recommended for new designs. lifebuy: ti has announced that the device will be discontinued, and a lifetime-buy period is in effect. nrnd: not recommended for new designs. device is in production to support existing customers, but ti does not recommend using this part in a new design. preview: device has been announced but is not in production. samples may or may not be available. obsolete: ti has discontinued the production of the device. (2) rohs: ti defines "rohs" to mean semiconductor products that are compliant with the current eu rohs requirements for all 10 rohs substances, including the requirement that rohs substance do not exceed 0.1% by weight in homogeneous materials. where designed to be soldered at high temperatures, "rohs" products are suitable for use in specified lead-free processes. ti may reference these types of products as "pb-free". rohs exempt: ti defines "rohs exempt" to mean products that contain lead but are compliant with eu rohs pursuant to a specific eu rohs exemption. green: ti defines "green" to mean the content of chlorine (cl) and bromine (br) based flame retardants meet js709b low halogen requirements of <=1000ppm threshold. antimony trioxide based flame retardants must also meet the <=1000ppm threshold requirement. (3) msl, peak temp. - the moisture sensitivity level rating according to the jedec industry standard classifications, and peak solder temperature. (4) there may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device. (5) multiple device markings will be inside parentheses. only one device marking contained in parentheses and separated by a "~" will appear on a device. if a line is indented then it is a continuation of the previous line and the two combined represent the entire device marking for that device. (6) lead/ball finish - orderable devices may have multiple material finish options. finish options are separated by a vertical ruled line. lead/ball finish values may wrap to two lines if the finish value exceeds the maximum column width. important information and disclaimer: the information provided on this page represents ti's knowledge and belief as of the date that it is provided. ti bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. efforts are underway to better integrate information from third parties. ti has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. ti and ti suppliers consider certain information to be proprietary, and thus cas numbers and other limited information may not be available for release. in no event shall ti's liability arising out of such information exceed the total purchase price of the ti part(s) at issue in this document sold by ti to customer on an annual basis.

important notice and disclaimer ti provides technical and reliability data (including datasheets), design resources (including reference designs), application or other design advice, web tools, safety information, and other resources ? as is ? and with all faults, and disclaims all warranties, express and implied, including without limitation any implied warranties of merchantability, fitness for a particular purpose or non-infringement of third party intellectual property rights. these resources are intended for skilled developers designing with ti products. you are solely responsible for (1) selecting the appropriate ti products for your application, (2) designing, validating and testing your application, and (3) ensuring your application meets applicable standards, and any other safety, security, or other requirements. these resources are subject to change without notice. ti grants you permission to use these resources only for development of an application that uses the ti products described in the resource. other reproduction and display of these resources is prohibited. no license is granted to any other ti intellectual property right or to any third party intellectual property right. ti disclaims responsibility for, and you will fully indemnify ti and its representatives against, any claims, damages, costs, losses, and liabilities arising out of your use of these resources. ti ? s products are provided subject to ti ? s terms of sale ( www.ti.com/legal/termsofsale.html ) or other applicable terms available either on ti.com or provided in conjunction with such ti products. ti ? s provision of these resources does not expand or otherwise alter ti ? s applicable warranties or warranty disclaimers for ti products. mailing address: texas instruments, post office box 655303, dallas, texas 75265 copyright ? 2018, texas instruments incorporated

▲Up To Search▲

Price & Availability of PAMC1035D

	To Download PAMC1035D Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .