AD7291TCPZ-EP

Octal Channel Single ADC SAR 22.22KSPS 12Bit Serial 20Pin LFCSP EP Tray

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

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12-bit SAR ADC

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8 single-ended analog input channels

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Analog input range: 0 V to 2.5 V

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12-bit temperature-to-digital converter

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Temperature sensor accuracy of ±1°C typical

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Channel sequencer operation

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Specified for VDD of 2.8 V to 3.6 V

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Logic voltage VDRIVE = 1.65 V to 3.6 V

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Internal 2.5 V reference

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See data sheet for additional features

**AD7291-EP supports defense and aerospace applications AQEC

standard

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*

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Download AD7291-EP data sheet pdf

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Extended industrial temperature range: −55°C to +125°C

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Controlled manufacturing baseline

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1 assembly/test site

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1 fabrication site

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Product change notification

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Qualification data available upon request

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V62/17610 DSCC Drawing Number