AD7291

8-Channel, I²C, 12-Bit SAR ADC with Temperature Sensor

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Overview

Features and Benefits
Product Details

Features and Benefits

12-bit SAR ADC
- 8 single-ended analog input channels
- Analog input range: 0 V to 2.5 V
12-bit temperature-to-digital converter
- Temperature sensor accuracy of ±1°C typical
Channel sequencer operation
Specified for V_DD of 2.8 V to 3.6 V
Logic voltage V_DRIVE = 1.65 V to 3.6 V
Internal 2.5 V reference
See data sheet for additional features

AD7291-EP supports defense and aerospace applications (AQEC
standard)

Download AD7291-EP data sheet (pdf)
Extended industrial temperature range: −55°C to +125°C
Controlled manufacturing baseline
1 assembly/test site
1 fabrication site
Product change notification
Qualification data available upon request
V62/17610 DSCC Drawing Number

Product Details

The AD7291 is a 12-bit, low power, 8-channel, successive approximation analog-to-digital converter (ADC) with an internal temperature sensor.

The part operates from a single 3.3 V power supply and features an I²C-compatible interface. The part contains a 9-channel multiplexer and a track-and-hold amplifier than can handle frequencies up to 30 MHz. The device has an on-chip 2.5 V reference that can be disabled to allow the use of an external reference.

The AD7291 provides a 2-wire serial interface compatible with I²C interfaces. The I²C interface supports standard and fast I²C interface modes. The AD7291 normally remains in a partial power-down state while not converting and powers up for conversions. The conversion process can be controlled by a command mode where conversions occur across I²C write operations or an autocycle mode selected through software control.

The AD7291 includes a high accuracy band gap temperature sensor, which is monitored and digitized by the 12-bit ADC to give a resolution of 0.25°C.

The AD7291 offers a programmable sequencer, which enables the selection of a preprogrammable sequence of channels for conversion.

On-chip limit registers can be programmed with high and low limits for the conversion results; an out-of-range indicator output (ALERT) becomes active when the programmed high or low limits are violated by the conversion result. This output can be used as an interrupt.

Product Highlights

Ideally suited to monitoring system variables in a variety of systems including telecommunications, process control, and industrial control.
I²C-compatible serial interface. Standard and fast modes.
Automatic partial power-down while not converting to maximize power efficiency.
Channel sequencer operation.
Integrated temperature sensor with 0.25°C resolution.
Out of range indicator that can be software disabled or enabled.

Product Categories

A/D Converters (ADC)
- Multiplexed A/D Converters

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Product Lifecycle Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (9)

EVAL-AD7291

AD7291 Evaluation Board

AD-FMCOMMS3-EBZ

AD9361 Wideband Software Defined Radio Board

AD-FMCOMMS4-EBZ

AD9364 Wideband Software Defined Radio Board

EVAL-ADRV9008/9

ADRV9008/ADRV9009 Evaluation Board

AD-FMCADC4-EBZ

ADA4961 & AD9680 Analog Signal Chain Evaluation and AD9528 Converter Synchronization

AD-FMCXMWBR1-EBZ

FMC X-Microwave Compatible Level Translator and Power Supply Kit

AD-FMCADC7-EBZ

ADL5567 & AD9625 Analog Signal Chain Evaluation and ADF4355-2 Wideband Synthesizer with VCO

AD-FMCOMMS11-EBZ

Direct RF to Baseband Transmit Radio

AD-FMCOMMS2-EBZ

AD9361 Software Defined Radio Board (2.4GHz Optimized)

AD-FMCOMMS3-EBZ

View Detailed Evaluation Kit Information

The AD-FMCOMMS3-EBZ is a high-speed analog module designed to showcase the AD9361, a high performance, highly integrated RF transceiver intended for use in RF applications, such as 3G and 4G base station and test equipment applications, and software defined radios. Its programmability and wideband capability make it ideal for a broad range of transceiver applications. The device combines an RF front end with a flexible mixed-signal baseband section and integrated frequency synthesizers, simplifying design-in by providing a configurable digital interface to a processor or FPGA. The AD9361 chip operates in the 70 MHz to 6 GHz range, covering most licensed and unlicensed bands. The chip supports channel bandwidths from less than 200 kHz to 56 MHz by changing sample rate, digital filters, and decimation, which are all programmable within the AD9361 itself.

The AD-FMCOMMS3-EBZ provides software developers and system architect who want a single platform to operate over a wider tuning range than the AD-FMCOMMS2-EBZ. RF performance expectations of this board must be tempered with the very wide band front end. It does meet the datasheet specifications at 2.4 GHz, but does not over the entire RF tuning range that the board supports. Typical performance data for the entire range (70 MHz – 6 GHz) which is supported by the platform is published within the board documentation. This board is primarily intended for system investigation and bringing up various waveforms from a software team before custom hardware is complete. The objective being for designers to see waveforms, but not being concerned about the last 1dB or 1% EVM of performance. For performance-oriented platforms – please refer to the AD-FMCOMMS2-EBZ.

Features & Benefits

Software tunable across wide frequency range (70 MHz to 6.0 GHz) with a channel bandwidth of <200 kHz to 56 MHz.
Phase and frequency synchronization on both transmit and receive paths
Allows high channel density
Powered from single FMC connector
Supports MIMO radio, with less than 1 sample sync on both ADC and DAC
Includes schematics, layout, BOM, HDL, Linux drivers and application software
Supports add on cards for spectrum specific designs (PA, LNA, etc.)

Resources

Software

IIO Oscilloscope Application

WIKI

AD-FMCOMMS4-EBZ

View Detailed Evaluation Kit Information

The AD-FMCOMMS4-EBZ provides software developers and system architect with a single 1 x 1 transceiver platform that can be software-configured for wideband tuning as well as narrowband RF performance.

In the wideband configuration, the AD-FMCOMMS4-EBZ will operate over the full 70 MHz to 6 GHz tuning range of the AD9364, however, the RF performance expectations of this configuration must be tempered with the very wide band front end. It will meet the AD9364 datasheet specifications at 2.4 GHz, but does not over the entire RF tuning range that the board can support. Typical performance data for the platform’s entire tuning range is published within the board documentation. This configuration is primarily intended for system investigation and bringing up various waveforms from a software team before custom hardware is complete. The objective being for designers to see waveforms, but not being concerned about the last 1dB or 1% EVM of performance.

The AD-FMCOMMS4-EBZ can also be user-configured for optimum performance in the 2400 – 2500 MHz band. In this configuration it may exhibit diminished RF performance on tuned frequencies or programmed configurations, outside of this band. This configuration is primarily intended to provide RF engineers with the ability to connect the AD9364 to an RF test bench (Vector Signal Analyzer, Signal generator, etc.) and achieve its optimum performance. The AD-FMCOMMS4-EBZ is a high-speed 1 x 1 agile RF transceiver analog FMC module software-tunable over the 56 MHz to 6 GHz band.

Features & Benefits

Software tunable across wide frequency range (70 MHz to 6.0 GHz) with a channel bandwidth of <200 kHz to 56 MHz
Phase and frequency synchronization on both transmit and receive paths
Powered from single FMC connector

Resources

Software

IIO Oscilloscope Application

WIKI

EVAL-ADRV9008/9

View Detailed Evaluation Kit Information

The ADRV9009-W/PCBZ is a radio card designed to showcase the ADRV9009, the widest bandwidth, highest performance RF integrated transceiver. The radio card provides a single 2x2 transceiver platform for device evaluation and rapid prototyping of radio solutions. All peripherals necessary for the radio card to operate including a high efficiency switcher only power supply solution, and a high performance clocking solution are populated on the board. The ADRV9009-W/PCBZ is a single-chip TDD solution of dual receivers, dual transmitters with observation receiver.

The ADRV9009-W/PCBZ operates over a wide tuning range 75MHz – 6GHz, however the RF performance is tempered by the very wide band front end match. This board is primarily intended for system investigation and bringing up various waveforms from a software team before custom hardware is complete. The objective being for designers to see waveforms, but not being concerned about the last 1dB or 1% EVM of performance.

The ADRV9008-1W/PCBZ is an evaluation kit to showcase the ADRV9008-1, offering dual receivers over a tuning range 75MHz – 6GHz. The ADRV9008-2W/PCBZ is an evaluation kit to showcase the ADRV9008-2, offering dual transmitters with observation receiver over a tuning range 75MHz – 6GHz.

ADRV9008/ADRV9009 Evaluation and Prototyping Platforms
ADI provides a full set of software and hardware tools for evaluation, prototyping and reference design. The following table outlines the available hardware and software tools.


	Carrier Boards	Software & Driver
Evaluation Platform	EVAL-TPG-ZYNQ3	Evaluation Software: API Library Windows GUI for configuration and data capture
Prototyping Platform	Xilinx ZCU102 Evaluation Kit Intel^® Arria^®10 SoC Development Kit	Prototyping Software: Open-source Linux driver Open-source Linux IIO Scope for data capture Compatible with GNU Radio Publicly available reference design on GitHub, using ADI JESD204B Interface Framework

Features & Benefits

Complete Radio Card for evaluation
- ADRV9009-W/PCBZ: Evaluation kit for ADRV9009 (Dual RF Rx/Tx/Orx Evaluation Board)
- ADRV9008-1W/PCBZ: Evaluation kit for ADRV9008-1 (Dual RF Rx Evaluation Board)
- ADRV9008-2W/PCBZ: Evaluation kit for ADRV9008-2 (Dual RF Tx/Orx Evaluation Board)
Wide band RF operation over 75MHz - 6GHz frequency range
Complete with high efficiency power supply solution and clocking solution
FMC connector to Xilinx motherboard (EVAL-TPG-ZYNQ3)
Powered from single FMC connector
Includes schematics, layout, BOM, HDL, drivers and application software

Resources

UG-1295: ADRV9008-1/ADRV9008-2/ADRV9009 Hardware Reference Manual

PDF

3.3 M

Software

AD-FMCADC4-EBZ

View Detailed Evaluation Kit Information

The AD-FMCADC4-EBZ is a high speed 4-channel data acquisition board featuring two AD9680 dual channel ADC at 1000 MSPS and four ADA4961 low distortion, 3.2 GHz, RF DGA driving each converter. The FMC form factor supports the JESD204B high speed serial interface. All clocking and channel synchronization is support on-board using the AD9528 clock generator. This product is designed for sampling wide bandwidth analog signals up to the second Nyquist zone. The combination of wide input bandwidth, high sampling rate, and excellent linearity of the AD9680 is ideally suited for spectrum analyzers, data acquisition systems, and a wide assortment of military electronics applications, such as radar and jamming/anti-jamming measures.

The board meets most of the FMC specifications in terms of mechanical size, mounting hole locations, and more. Although this board does meet most of the FMC specifications, it’s not meant as a commercial off the shelf (COTS) board. If you want a commercial, ready to integrate product, please refer to one of the many FMC manufacturers and the FMC specification (ANSI/VITA 57.1).

This board is targeted to use the ADI reference designs that work with Xilinx development systems. ADI provides complete source (HDL and software) to re-create those projects (minus the IP provided by the FPGA vendors, which we use), but may not provide enough info to port this to your custom platform.

The design of the board is specifically tailored to synchronizing multiple AD-FMCADC4-EBZ boards together. For more information on synchronization please refer to A Test Method for Synchronizing Multiple GSPS Converters. The reference design includes the device data capture via the JESD204B serial interface and the SPI interface. The samples are written to the external DDR-DRAM. It allows programming the device and monitoring its internal registers via SPI.

Features & Benefits

Four channels of 1.0 GSPS conversion utilizing JESD204B high speed serial interface
Driver amplifier interface with 21dB voltage gain adjustment
Optional on-board or external clocking
Specific design and I/O added for multi-board synchronization

Resources

Software

AD-FMCXMWBR1-EBZ

View Detailed Evaluation Kit Information

The AD-FMCXMWBR1-EBZ is a level translator and power supply board, with FMC-compatible form factor. It is powered from the FMC connector, with the possibility to add an external supply, for application that require higher load currents. In this case, the external supply is prioritized.

AD-FMCXMWBR1-EBZ allows multiple level translated digital communications paths between a controller/FPGA device and X-MW blocks. The module provides multiple supply voltages with high current capability, that can be used to bias the X-MW blocks or other IC’s in a prototype design.

APPLICATIONS

RF and Microwave designs
Voltage level translation
General-purpose software radios
Radar systems
Point to point communication systems
Multiple input/multiple output (MIMO) radios
Automated test equipment

Features & Benefits

FMC-compatible form factor
Powered from FMC connector with external supply possibility
Provides level translation and various supply values
Compatible with RaspberryPi X-MW controller

Resources

AD-FMCXMWBR1-EBZ User Guide

WIKI

AD-FMCADC7-EBZ

View Detailed Evaluation Kit Information

The AD-FMCADC7-EBZ is a single channel high speed data acquisition board featuring the AD9625 12bit, ADC sampling at 2500 MSPS and a ADL5567 low distortion, 4.8 GHz, differential amplifier driving the converter. The FMC form factor supports the JESD204B high speed serial interface. All clocking is supported using the on-board ADF4355-2 wideband PLL with VCO. This product is designed for sampling wide bandwidth analog signals from DC to 1.8GHz. The combination of wide input bandwidth, high sampling rate, and excellent linearity of the AD9625 is ideally suited for spectrum analyzers, data acquisition systems, and a wide assortment of military electronics applications.

This board is targeted to use the ADI reference designs that work with Xilinx development systems. ADI provides complete source (HDL and software) to re-create those projects (minus the IP provided by the FPGA vendors, which we use), but may not provide enough info to port this to your custom platform.

The design of the board is specifically tailored to allow for true DC coupling on the analog input of the amplifier throughout the signal chain to the converter. Yielding the widest spectrum possible for the AD-FMCADC7-EBZ.

The reference design includes the device data capture via the JESD204B serial interface and the SPI interface. The samples are written to the external DDR-DRAM. It allows programming the device and monitoring it’s internal registers via SPI.

Features & Benefits

Single channel of 2.5 GSPS conversion utilizing JESD204B high speed serial interface

Driver amplifier interface with 20dB voltage gain adjustment

On-board PLL and VCO setup for clocking or external clocking

True DC coupled input and analog input frontend to the ADC, BW = DC to 1.8GHz

Resources

AD-FMCOMMS11-EBZ

View Detailed Evaluation Kit Information

The AD-FMComms11-EBZ board is a system platform board for communication infrastructure applications that demonstrates the Direct to RF (DRF) transmitter and observation receiver architecture. Using high sample rate RFDAC(s) and RFADC(s), a number of components in previous generation transmitters can be eliminated, such as mixers, modulators, IF amplifiers and filters. The objective being to bring the ADC or DAC as close to the antenna as possible, leading to possibly more cost effective and efficient communications solution.

It is composed of multi-GSPS RF ADC and DAC, AD9625 and AD9162 respectively. The transmit path contains a balun, low pass filter, gain block and variable attenuation to produce an output appropriate for a power amplifier module. Along the observation path, the PA output is coupled back into the board through a variable attenuator, a balun and finally the ADC. Clock management is taken care of on board; all the necessary clocks are generated from a reference. Power management is present as well.

Features & Benefits

TX
- 16-bit 12GSPS RFDAC
- JESD204B Interface
  - 8 lanes up to 12.5Gbps
- 1x/2x/4x/6x/8x/12x/16x/24x/32x Interpolation
- 64-bit NCO at max rate
- Analog Modes of Operation:
  - Normal Mode: 6GSPS DAC rate
    - Synthesis up to 2.5GHz (1st Nyquist)
  - Mix Mode: 6GSPS DAC rate
    - Synthesis in 2nd & 3rd Nyquist zones
  - 2X Normal Mode: 12GSPS DAC rate
    - Synthesis up to 6GHz (1st Nyquist)
  - Excellent dynamic performance
RX
- 3.2GHz full power bandwidth at 2.5GSPS
  - Noise Density = -149.5dBFs/Hz, ENOB = 9.5 bits
  - SFDR = 77 dBc at 1GHz Ain (2.5Gsps)
  - SFDR = 77dBc at 1.8GHz Ain (2.5Gsps)
- +/-0.3 LSB DNL, +/-1.0 LSB INL
- Dual supplies : 1.3V and 2.5V
- 8 or 6 Lane JESD204B Outputs
- Programmable clipping threshold for Fast Detect output
- Two Integrated wide band digital down converters (DDC) per channel
  - 10-bit complex NCO
  - 2 cascaded half band filters (dec/8, dec/16)
- Timestamp for synchronous processing alignment
  - SYSREF Setup/Hold detector
- Programmable Interrupt (IRQ) event monitor

Resources

Software

JESD204 Interface Framework

AD-FMCOMMS2-EBZ

View Detailed Evaluation Kit Information

The AD-FMCOMMS2-EBZ is a high-speed analog module designed to showcase the AD9361, a high performance, highly integrated RF transceiver intended for use in RF applications, such as 3G and 4G base station and test equipment applications, and software defined radios. Its programmability and wideband capability make it ideal for a broad range of transceiver applications. The device combines an RF front end with a flexible mixed-signal baseband section and integrated frequency synthesizers, simplifying design-in by providing a configurable digital interface to a processor or FPGA. The AD9361 chip operates in the 70 MHz to 6 GHz range, covering most licensed and unlicensed bands. The AD-FMCOMMS2-EBZ board comes specifically tuned and optimized to 2.4 GHz and due to the limitations of the on-board discrete external components, it may exhibit diminished RF performance on some other programmed configurations. The chip supports channel bandwidths from less than 200 kHz to 56 MHz by changing sample rate, digital filters, and decimation, all programmable within the AD9361 itself.

The AD-FMCOMMS2-EBZ provides RF engineers the ability to connect the AD9361 to a RF testbench (Vector Signal Analyzer, Signal generator, etc) and measure performance. The external components (which can easily be swapped) on the AD-FMCOMMS2-EBZ have a narrower RF tuning range 2400 – 2500 MHz. It is expected that most engineers will change these external components (pin for pin replacements from various vendors are available) for their specific application/frequency of interest. Anyone interested in a wider tuning range board should look at the AD-FMCOMMS3-EBZ.

Features & Benefits

Software tunable across wide frequency range (70 MHz to 6.0 GHz) with a channel bandwidth of <200 kHz to 56 MHz.
Phase and frequency synchronization on both transmit and receive paths
Performance optimized for the narrowband range of 2.4GHz to 2.5GHz

Resources

Software

IIO Oscilloscope Application

WIKI

Documentation & Resources

Data Sheets

AD7291-DSCC: Military Data Sheet
9/5/2017
AD7291-EP: Enhanced Product Data Sheet (Rev. 0)
7/31/2017

PDF

183 K
AD7291: 8-Channel, I²C, 12-Bit SAR ADC with Temperature Sensor Data Sheet (Rev. C)
11/16/2009

PDF

415 kB

User Guides

UG-253: Evaluation Board for the AD7291, 8-Channel, I²C, 12-Bit SAR ADC with Temperature Sensor
3/25/2011

PDF

1010 kB

Tutorials

Integrated SAR ADC Family in 4mm x 4mm Package
11/10/2011

PDF

1670 kB

Technical Articles

Designing Power Supplies for High Speed ADC
2/1/2012

Software & Systems Requirements

Evaluation Software

ZIP

AD7291 Evaluation Software

Device Drivers

WIKI

AD7291 - Microcontroller No-OS Driver

WIKI

AD7291 IIO ADC Linux Driver

FPGA/HDL

WIKI

BeMicro FPGA Project for AD7291 with Nios driver

WIKI

AD7291 FMC-SDP Interposer & Evaluation Board / Xilinx KC705 Reference Design

Product Recommendations

AD7291 Companion Parts

Recommended Input Buffer Amplifiers

For a precision, battery-powered, instrumentation amplifier: AD8420.
For applications requiring low cost, low temperature drift, good DC and AC precision: AD8692.
For low power applications: ADA4692-2.
For applications requiring highest precision: AD8606.
For high speed, low noise, low distortion: AD8022.

Recommended High Accuracy, Precision External References - 2.5V

For high output current applications: ADR431.
For cost sensitive applications: AD1582, ADR391.
For applications requiring the lowest noise performance and output trim adjust: ADR441.
For wide supply applications: AD780.

Design Resources

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.

Quality And Reliability

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Support & Discussions

AD7291 Discussions

AD9364 Tx attenuation steps error

2 week(s) ago in Design Support AD9361/AD9363/AD9364

FMCOMMS5/ZCU706/GNURadio

7 week(s) ago in Linux Software Drivers

RE: ADI Linux Image on ZCU102+ADRV9009

13 week(s) ago in Linux Software Drivers

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