AD7291 - ADI

The pictures are for reference only, and the specific specifications can be found in the product manual.

Part No

AD7291
Manufacturer

ADI
ChipWorker Part#

CW353141437
RoHS

Lead free / RoHS Compliant
Description

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

Datasheet

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AD7291 Specifications

Attribute	Attribute Value

Part Number	AD7291
Manufacturer	ADI
ChipWorker Part#	CW353141437
Documentation	Datasheet
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Product Lifecycle Status	Recommended for New Designs
RoHS	RoHS Compliant

Product Description

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**
1. Ideally suited to monitoring system variables in a variety of systems including telecommunications, process control, and industrial control.
2. I2C-compatible serial interface. Standard and fast modes.
3. Automatic partial power-down while not converting to maximize power efficiency.
4. Channel sequencer operation.
5. Integrated temperature sensor with 0.25°C resolution.
6. Out of range indicator that can be software disabled or enabled.
### 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 VDD of 2.8 V to 3.6 V
Logic voltage VDRIVE = 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

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