AD7691: 18-Bit, 1.5 LSB INL, 250 kSPS PulSAR® Differential ADC in MSOP/QFN
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Product Details
myAnalogFEATURES and BENEFITS
- 18-bit resolution with no missing codes
- Throughput: 250 kSPS
- INL: ±0.75 LSB typical, ±1.5 LSB maximum (±6 ppm of FSR)
- Dynamic range: 102 dB typical @ 250 kSPS
- Oversampled dynamic range: 125 dB @1 kSPS
- Noise-free code resolution: 20 bits @ 1 kSPS
- Effective resolution: 22.7 bits @ 1 kSPS
- SINAD: 101.5 dB typical @ 1 kHz
- THD: −125 dB typical @ 1 kHz
- True differential analog input range: ±VREF 0 V to VREF with VREF up to VDD on both inputs
- No pipeline delay
- Single-supply 2.3 V to 5 V operation with 1.8 V/2.5 V/3 V/5 V logic interface
- Serial interface SPI-/QSPI™-/MICROWIRE™-/DSP-compatible
- Ability to daisy-chain multiple ADCs
- Optional busy indicator feature
- Power dissipation
1.35 mW @ 2.5 V/100 kSPS, 4 mW @ 5 V/100 kSPS
1.4 μW @ 2.5 V/100 SPS - Standby current: 1 nA
- 10-lead packages: MSOP (MSOP-8 size) and 3 mm × 3 mm QFN (LFCSP) (SOT-23 size)
- Pin-for-pin compatible with the18-bit AD7690 and 16-bit AD7693, AD7688, and AD7687
Functional Block Diagram for AD7691
18-Bit, 1.5 LSB INL, 250 kSPS PulSAR® Differential ADC in MSOP/QFN
Other Diagrams for AD7691
18-Bit, 1.5 LSB INL, 250 kSPS PulSAR® Differential ADC in MSOP/QFN
10-Lead MSOP
10-Lead QFN (LFCSP)
Circuit Diagram
Functional Block Diagram for AD7691
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Techincal Article
Documentation
Design Tools,Models,Drivers & Software
| Title | Content Type | File Type |
|---|---|---|
| AD7685 IBIS Models | IBIS Models | HTML |
| BeMicro FPGA Project for AD7691 with Nios driver | FPGA HDL | HTML |
| AD7691 FMC-SDP Interposer & Evaluation Board / Xilinx KC705 Reference Design | FPGA HDL | HTML |
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Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.
Product Recommendations & Reference Designs
CN0261:Optimizing AC Performance in an 18-bit, 250 kSPS, PulSAR Measurement Circuit
Benefits & Features
- 18-Bit, 250kSPS PulSAR ADC
- Low Noise Driver
- Greater than 100dB SNR @ 1kHz Input
- Greater than 118dB THD @ 1kHz Input
Products Used
Explore in Signal Chain Designer
HARDWARE
Companion Products
Suggested Companion Products
Recommended Driver Amplifiers for the AD7691
- For low frequency, precision, low bias current applications, we recommend the ADA4627-1, ADA4610-2, or the AD8476.
- For precision, low power, low distortion applications, we recommend the ADA4841-1, ADA4940-1 or the ADA4941-1.
- For high frequency, low noise, low distortion applications, we recommend the ADA4899, ADA4897-1, or the AD8021.
- For additional driver amplifier selections, we recommend selecting the product category and filtering on our parametric search tables.
- For low drift, low noise and high current output applications, we recommend the ADR435 reference family.
- For low drift, low noise and low dropout, we recommend the ADR445 reference family.
- For low drift, low noise, low power, we recommend the ADR4550 reference family.
- For additional voltage reference selections, we recommend filtering on our parametric search tables.
Recommended Digital Isolators for the AD7691
- For SPI Interface, lowest power, 2.5 kVrms isolation, we recommend the ADuM1401.
- For SPI Interface, enhanced system-level ESD performance, 2.5 kVrms isolation, we recommend the ADuM3401.
- For SPI Interface, low power, 5.0 kVrms isolation, we recommend the ADuM4401.
- For SPI Interface, smallest package, low voltage I/O (1.8 V to 5.5 V), we recommend the ADuM3481.
- For additional digital isolator selections, we recommend filtering on our parametric search tables.
- For selecting voltage regulator products, use ADIsimPower.
- For selecting supervisor products, use the Supervisor Parametric Search.
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Price, packaging, availability
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Packing, Qty |
Price*(100-499) | Price*1000 pcs | RoHS | View PCN/ PDN | Check Inventory/ Purchase/Sample |
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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
