16-Bit, 4-Channel/8-Channel, 250 kSPS PulSAR ADCs Data ...

1 16-Bit, 4- channel /8- channel , 250 ksps pulsar adcs data sheet ad7682 /AD7689. FEATURES FUNCTIONAL BLOCK DIAGRAM. TO VDD TO VDD TO 16-bit resolution with no missing codes F 10 F. 4- channel ( ad7682 )/8- channel (AD7689) multiplexer with REFIN REF VDD. choice of inputs Unipolar single-ended BAND GAP. VIO TO. Differential (GND sense) REF. ad7682 /AD7689 VDD. Pseudobipolar TEMP. SENSOR. Throughput: 250 ksps . IN0 CNV. INL: LSB typical, LSB maximum ( 23 ppm or FSR) IN1. SCK. Dynamic range: dB IN2. IN3. MUX 16-BIT SAR. ADC. SPI SERIAL. INTERFACE SDO. SINAD: dB at 20 kHz IN4. ONE-POLE. IN5 DIN. THD: 100 dB at 20 kHz IN6 LPF. SEQUENCER. IN7. analog input range: 0 V to VREF with VREF up to VDD. COM. Multiple reference types 07353-001. GND. Internal selectable V or V. External buffered (up to V) Figure 1. External (up to VDD). Internal temperature sensor (TEMP) GENERAL DESCRIPTION. channel sequencer, selectable 1-pole filter, busy indicator The ad7682 /AD7689 are 4- channel /8- channel , 16-bit, charge No pipeline delay, SAR architecture redistribution successive approximation register (SAR) analog - Single-supply V to V operation with V to V.

2 To-digital converters ( adcs ) that operate from a single power logic interface supply, VDD. Serial interface compatible with SPI, MICROWIRE, QSPI, and DSP The ad7682 /AD7689 contain all components for use in a Power dissipation multichannel, low power data acquisition system, including a mW at V/200 ksps true 16-bit SAR ADC with no missing codes; a 4- channel mW at 5 V/250 ksps ( ad7682 ) or 8- channel (AD7689) low crosstalk multiplexer Standby current: 50 nA that is useful for configuring the inputs as single-ended (with or Low cost grade available without ground sense), differential, or bipolar; an internal low 20-lead 4 mm 4 mm LFCSP package drift reference (selectable V or V) and buffer; a 20-lead mm mm WLCSP package temperature sensor; a selectable one-pole filter; and a sequencer that is useful when channels are continuously scanned in order. APPLICATIONS. The ad7682 /AD7689 use a simple SPI interface for writing to Multichannel system monitoring the configuration register and receiving conversion results.

3 The Battery-powered equipment SPI interface uses a separate supply, VIO, which is set to the Medical instruments: ECG/EKG. host logic level. Power dissipation scales with throughput. Mobile communications: GPS. Power line monitoring The ad7682 /AD7689 are housed in a tiny 20-lead LFCSP and data acquisition 20-lead WLCSP with operation specified from 40 C to +85 C. Seismic data acquisition systems Table 1. Multichannel 14-/16-Bit PulSAR adcs Instrumentation Type Channels 250 ksps 500 ksps ADC Driver Process control 14-Bit 8 AD7949 ADA4805-1/. ADA4807-1. 16-Bit 4 ad7682 ADA4805-1/. ADA4807-1. 16-Bit 8 AD7689 AD7699 ADA4805-1/. ADA4807-1. Rev. H Document Feedback Information furnished by analog devices is believed to be accurate and reliable. However, no responsibility is assumed by analog devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use.

4 Specifications subject to change without notice. No One Technology Way, Box 9106, Norwood, MA 02062-9106, license is granted by implication or otherwise under any patent or patent rights of analog devices . Tel: 2008 2017 analog devices , Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. Technical Support ad7682 /AD7689 data sheet TABLE OF CONTENTS. Features .. 1 Power 25. Applications .. 1 Supplying the ADC from the 25. Functional Block Diagram .. 1 Digital Interface .. 26. General Description .. 1 Reading/Writing During Conversion, Fast 26. Revision History .. 2 Reading/Writing After Conversion, Any Speed 26. 4 Reading/Writing Spanning Conversion, Any Speed Host .. 26. Timing Specifications .. 7 Configuration Register, CFG .. 26. Absolute Maximum Ratings .. 9 General Timing Without a Busy Indicator .. 28. ESD Caution .. 9 General Timing with a Busy Indicator.

5 29. Pin Configurations and Function Descriptions .. 10 channel Sequencer .. 30. Typical Performance Characteristics .. 14 Read/Write Spanning Conversion Without a Busy Terminology .. 17 Indicator .. 31. Theory of Operation .. 18 Read/Write Spanning Conversion with a Busy Indicator .. 32. 18 Applications Information .. 33. Converter Operation .. 18 Layout .. 33. Transfer 19 Evaluating the ad7682 /AD7689 Performance .. 33. Typical Connection Diagrams .. 20 Outline Dimensions .. 34. analog Inputs .. 21 Ordering Guide .. 35. Driver Amplifier Choice .. 23. Voltage Reference Output/Input .. 23. REVISION HISTORY. 8/2017 Rev. G to Rev. H 1/2015 Rev. D to Rev. E. Changed CP-20-8 to CP-20-10 .. Throughout Added WLCSP (Throughout) ..1. Change to Product 1 Added WLCSP Signal-to-Noise and SINAD Parameters;. Updated Outline Dimensions .. 34 Table 2 ..3. Changes to Ordering Guide .. 35 Changed JA Thermal Impedance (LFCSP) from C/W to 48 C/W.

6 9. 6/2017 Rev. F to Rev. G Added Figure 6, Figure 7, and Table 8 .. 12. Changed CP-20-10 to CP-20-8 .. Throughout Changes to Layout Section .. 33. Changes to Table 11 .. 27 Added Figure 47; Outline Dimensions .. 34. Updated Outline Dimensions .. 34 Changes to Ordering Guide .. 35. Changes to Ordering Guide .. 35. 4/2012 Rev. C to Rev. D. 4/2016 Rev. E to Rev. F Changes to Figure 18. Changed ADA4841-x to ADA4805-1/ADA4807-1, Table 1 .. 1 Changed Internal Reference Section to Internal Added Endnote 6, Table 3; Renumbered Sequentially .. 6 Reference/Temperature Sensor 21. Changes to Figure 28 and Figure 20 Changes to Internal Reference/Temperature Sensor Section .. 21. Changes to Table 10 .. 23 Changed External Reference/Temperature Sensor Section to Changes to External Reference Section and the Reference External Reference Section .. 22. Decoupling Section .. 24 Changes to External Reference and Internal Buffer Section and Changes to the Supplying the ADC from the Reference Section.

7 25 External Reference Section .. 22. Changes to Ordering Guide .. 35 Changes to REF Bit, Function Column, Table 10 .. 25. Updated Outline Dimensions .. 32. Rev. H | Page 2 of 35. data sheet ad7682 /AD7689. 9/2011 Rev. B to Rev. C Changes to Figure 26 and Figure 27 .. 17. Changes to Internal Reference Section ..21 Changes to Bipolar Single Supply Section and analog Inputs Changes to the External Reference and Internal Buffer Section .. 18. Section ..22 Changes to Internal Reference/Temperature Sensor Section .. 20. Changes to the External Reference/Temperature Sensor Added Figure 31; Renumbered Sequentially .. 20. Section ..22 Changes to External Reference and Internal Buffer Section and Changes to Table 10, REF Bit Description ..25 External Reference Section .. 21. Added Figure 32 and Figure 33 .. 21. 6/2009 Rev. A to Rev. B Changes to Power Supply Section .. 22. Changes Table 6 .. 8 Changes to Digital Interface Section, Reading/Writing After Changes to Figure 37.

8 25 Conversion, Any Speed Hosts Section, and Configuration Changes to Figure 38 ..26 Register, CFG Section .. 23. Changes to Table 10 .. 24. 3/2009 Rev. 0 to Rev. A Added General Timing Without a Busy Indicator Section and Changes to Features Section, Applications Section, and Figure 37 .. 25. Figure 1 .. 1 Added General Timing With a Busy Indicator Section and Added Table 2; Renumbered Sequentially .. 3 Figure 38 .. 26. Changed VREF to VREF .. 4 Added channel Sequencer Section and Figure 39 .. 27. Changes to Table 3 .. 5 Changes to Read/Write Spanning Conversion Without a Busy Changes to Table 4 .. 6 Indicator Section and Figure 41 .. 28. Changes to Table 5 .. 7 Changes to Read/Write Spanning Conversion with a Busy Deleted Endnote 2 in Table 6 .. 8 Indicator and Figure 43 .. 29. Changes to Figure 4, Figure 5, and Table 7 .. 9 Changes to Evaluating ad7682 /AD7689 Performance Changes to Figure 6, Figure 9, and Figure 10.

9 11 Section .. 30. Changes to Figure 22 ..13 Added Exposed Pad Notation to Outline Dimensions .. 31. Changes to Overview Section and Converter Operation Changes to Ordering Guide .. 31. Section ..15. Changes to Table 8 ..16 5/2008 Revision 0: Initial Version Rev. H | Page 3 of 35. ad7682 /AD7689 data sheet SPECIFICATIONS. VDD = V to V, VIO = V to VDD, VREF = VDD, all specifications TMIN to TMAX, unless otherwise noted. Table 2. Test Conditions/ AD7689A AD7682B/AD7689B. Parameter Comments Min Typ Max Min Typ Max Unit RESOLUTION 16 16 Bits analog INPUT. Voltage Range Unipolar mode 0 +VREF 0 +VREF V. Bipolar mode VREF/2 +VREF/2 VREF/2 +VREF/2. Absolute Input Voltage Positive input, unipolar VREF + VREF + V. and bipolar modes Negative or COM input, + + V. unipolar mode Negative or COM input, VREF/2 VREF/2 VREF/2 + VREF/2 VREF/2 VREF/2 + V. bipolar mode analog Input CMRR fIN = 250 kHz 68 68 dB. Leakage Current at 25 C Acquisition phase 1 1 nA.

10 Input Impedance 1. THROUGHPUT. Conversion Rate Full Bandwidth 2 VDD = V to V 0 250 0 250 ksps . VDD = V to V 0 200 0 200 ksps . Bandwidth2 VDD = V to V 0 0 ksps . VDD = V to V 0 50 0 50 ksps . Transient Response Full-scale step, full s bandwidth Full-scale step, s bandwidth ACCURACY. No Missing Codes 15 16 Bits Integral Linearity Error 4 +4 + LSB 3. Differential Linearity Error 1 + LSB. Transition Noise REF = VDD = 5 V LSB. Gain Error 4 32 +32 8 1 +8 LSB. Gain Error Match 2 4 +4 LSB. Gain Error Temperature 1 1 ppm/ C. Drift Offset Error4 VDD = V to V 32 +32 8 1 +8 LSB. VDD = V to V 32 5 LSB. Offset Error Match 2 4 +4 LSB. Offset Error Temperature 1 1 ppm/ C. Drift Power Supply Sensitivity VDD = 5 V 5% LSB. AC ACCURACY 5. Dynamic Range dB 6. Signal-to-Noise LFCSP fIN = 20 kHz, VREF = 5 V 90 dB. fIN = 20 kHz, VREF = V, 89 91 dB. internal REF. fIN = 20 kHz, VREF = V, 86 dB. internal REF. Rev. H | Page 4 of 35.