AD7291
PRODUCTION8-Channel, I2C, 12-Bit SAR ADC with Temperature Sensor
- Part Models
- 4
- 1ku List Price
- Starting From $4.80
Part Details
- 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
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.
Documentation
Data Sheet 3
User Guide 1
Technical Articles 1
Tutorial 1
Device Drivers 2
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 |
---|---|---|---|
AD7291BCPZ | 20-Lead LFCSP (4mm x 4mm w/ EP) | ||
AD7291BCPZ-RL7 | 20-Lead LFCSP (4mm x 4mm w/ EP) | ||
AD7291TCPZ-EP | 20-Lead LFCSP (4mm x 4mm w/ EP) | ||
AD7291TCPZ-EP-RL7 | 20-Lead LFCSP (4mm x 4mm w/ EP) |
Part Models | Product Lifecycle | PCN |
---|---|---|
May 11, 2014 - 13_0231 Assembly Transfer of Select 4x4 and 5x5mm LFCSP Products to STATS ChipPAC China. |
||
AD7291BCPZ | PRODUCTION | |
AD7291BCPZ-RL7 | PRODUCTION |
This is the most up-to-date revision of the Data Sheet.
Software Resources
FPGA/HDL 2
Device Drivers 2
Evaluation Software 1
Can't find the software or driver you need?
Hardware Ecosystem
Parts | Product Life Cycle | Description |
---|---|---|
General Purpose Op Amps 1 | ||
ADA4692-2 | PRODUCTION | Low Power, 3.6 MHz, Low Noise, Rail-to-Rail Output, Operational Amplifiers |
High Voltage Op Amps ≥12V 1 | ||
AD8022 | PRODUCTION | Dual High Speed, Low Noise Op Amp |
Instrumentation Amplifiers 1 | ||
AD8420 | RECOMMENDED FOR NEW DESIGNS | Wide Supply Range, Micropower, Rail-to-Rail Instrumentation Amplifier |
Low Noise Op Amps (≤ 10nV/√Hz) 1 | ||
AD8692 | PRODUCTION | Low Cost, Low Noise, Dual CMOS Rail-to-Rail Output Operational Amplifier |
Precision Op Amps (Vos ≤1mV & TCVos ≤2uV/C) 1 | ||
AD8606 | PRODUCTION | Precision, Low Noise, RRIO, CMOS Op Amp (Dual) |
Series Voltage References 4 | ||
AD1582 | PRODUCTION | 2.5V Micropower, Precisions Series Mode Voltage References |
ADR391 | PRODUCTION | 2.5V Micropower, Low Noise Precision Voltage Reference with Shutdown |
ADR441 | PRODUCTION | Ultralow Noise, LDO XFET® 2.5V Voltage Reference w/Current Sink and Source |
ADR431 | PRODUCTION | Ultralow Noise XFET® Voltage References with Current Sink and Source Capability |
Shunt Voltage References 1 | ||
AD780 | PRODUCTION | 2.5 V/3.0 V High Precision Reference |