AD7691
PRODUCTION18-Bit, 1.5 LSB INL, 250 kSPS PulSAR® Differential ADC in MSOP/QFN
- Part Models
- 4
- 1ku List Price
- Starting From $17.78
Part Details
- 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 at 250 kSPS
- Oversampled dynamic range: 125 dB at1 kSPS
- Noise-free code resolution: 20 bits at 1 kSPS
- Effective resolution: 22.7 bits at 1 kSPS
- See data sheet for additional features
AD7691-EP supports defense and aerospace applications (AQEC standard)
- Download AD7691-EP data sheet (pdf)
- Military temperature range: –55°C to +105°C
- Controlled manufacturing baseline
- One assembly/test site
- One fabrication site
- Enhanced product change notification
- Qualification data available on request
- V62/14632-01XE DSCC Drawing Number
The AD7691 is an 18-bit, charge redistribution, successive approximation, analog-to-digital converter (ADC) that operates from a single power supply, VDD, between 2.3 V and 5 V. It contains a low power, high speed, 18-bit sampling ADC with no missing codes, an internal conversion clock, and a versatile serial interface port. On the CNV rising edge, it samples the voltage difference between the IN+ and IN− pins. The voltages on these pins usually swing in opposite phase between 0 V and REF. The reference voltage, REF, is applied externally and can be set up to the supply voltage.
The part’s power scales linearly with throughput.
The SPI-compatible serial interface also features the ability, using the SDI input, to daisy-chain several ADCs on a single 3-wire bus and provides an optional busy indicator. It is compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic, using the separate VIO supply.
The AD7691 is housed in a 10-lead MSOP or a 10-lead QFN (LFCSP) with operation specified from −40°C to +85°C.
Applications
- Battery-powered equipment
- Data acquisitions
- Seismic data acquisition systems
- Instrumentation
- Medical instruments
Documentation
Data Sheet 3
User Guide 2
Application Note 1
Technical Articles 2
Tested Product Combinations 1
Tutorial 4
Product Selection Guide 1
Circuit Note 1
Technical Book 1
Device Drivers 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| AD7691BCPZRL7 | 10-Lead LFCSP (3mm x 3mm) | ||
| AD7691BRMZ | 10-Lead MSOP | ||
| AD7691BRMZ-RL7 | 10-Lead MSOP | ||
| AD7691SRMZ-EP-RL7 | 10-Lead MSOP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
May 15, 2012 - 10_0006 Halogen Free Material Change for mini SOIC Products |
||
| AD7691BRMZ | PRODUCTION | |
| AD7691BRMZ-RL7 | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
FPGA/HDL 2
Device Drivers 1
Evaluation Software 0
Can't find the software or driver you need?
Hardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Fully Differential Amplifiers 1 | ||
| AD8476 | PRODUCTION | Low Power, Unity Gain Fully Differential Amplifier & ADC Driver |
| Low Input Bias Current Op Amps (≤100 pA) 2 | ||
| ADA4627-1 | PRODUCTION | 36 V, 19 MHz, Low Noise, Low Bias Current, JFET Op Amp |
| ADA4610-2 | RECOMMENDED FOR NEW DESIGNS | Low Noise, Precision, Rail-to-Rail Output, JFET Dual Op Amp |
| Low Noise Op Amps (≤ 10nV/√Hz) 1 | ||
| ADA4897-1 | RECOMMENDED FOR NEW DESIGNS | 1 nV/√Hz, Low Power, Rail-to-Rail Output Amplifiers |
| Low Power Op Amps (≤ 1mA/amp) 1 | ||
| AD8031 | PRODUCTION | 2.7 V, 800 µA, 80 MHz Rail-to-Rail I/O Single Amplifier |
| Precision Op Amps (Vos ≤1mV & TCVos ≤2uV/C) 3 | ||
| ADA4841-1 | PRODUCTION | Low Power, Low Noise and Distortion, Rail-to-Rail Output Amplifier |
| AD8021 | PRODUCTION | Low Noise, High Speed Amplifier for 16-Bit Systems |
| AD8655 | PRODUCTION | Low Noise, Precision CMOS Amplifier |
| Series Voltage References 3 | ||
| ADR435 | PRODUCTION | Ultralow Noise XFET® Voltage References with Current Sink and Source Capability |
| ADR4550 | PRODUCTION | Ultra-Low-Noise, High-Accuracy 5.0V Voltage Reference |
| ADR445 | PRODUCTION | Ultralow Noise, LDO XFET® 5.0V Voltage Reference w/Current Sink and Source |
| Single-Ended to Differential Amplifiers 2 | ||
| ADA4940-1 | PRODUCTION | Ultralow Power, Low Distortion ADC Driver |
| ADA4941-1 | PRODUCTION | Single-Supply, Differential 18-Bit ADC Driver |
| Standard Digital Isolators 4 | ||
| ADUM4401 | PRODUCTION |
5 kV RMS Quad-Channel Digital Isolators |
| ADUM3481 | PRODUCTION | Small, 3.75 kV RMS Quad Digital Isolators (3/1 Channel Directionality) |
| ADUM3401 | PRODUCTION | Quad-Channel, Digital Isolator, Enhanced System-Level ESD Reliability |
| ADUM1401 | PRODUCTION | Quad-Channel Digital Isolator (3/1 Channel Directionality) |
Tools & Simulations
Precision ADC Driver Tool
The Precision ADC Driver Tool is a web application that simulates the performance of precision ADC and driver combinations. Potential issues with driver selection, kickback settling, and distortion are flagged, and design tradeoffs can be quickly evaluated. Simulations and calculations include system noise, distortion, and settling of the ADC input
Open ToolAD7685 IBIS Models 1
Evaluation Kits
AD7691 Evaluation Kit
Resources
Software
18-Bit, 250 kSPS PulSAR® ADC PMOD Evaluation Board
Resources
Software
Reference Designs
18-Bit, 250 kSPS Data Acquisition System Optimized for AC Performance