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AD7291 8-Channel, I2C, 12-Bit SAR ADC with Temperature Sensor

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

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.

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Reference Materials

• Tutorials：Integrated SAR ADC Family in 4mm x 4mm Package
• Technical Articles：MS-2210: Designing Power Supplies for High Speed ADC