●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
