Datasheet AD7291-EP (Analog Devices)

8-Channel, I2C, 12-Bit SAR ADC with Temperature Sensor Enhanced Product AD7291-EP FEATURES FUNCTIONAL BLOCK DIAGRAM 12-bit SAR ADC VDD GND 8 single-ended analog input channels Analog input range: 0 V to 2.5 V VREF 12-bit temperature to digital converter REF BUF Temperature sensor accuracy of ±1°C typical Channel sequencer operation 12-BIT VIN0 SUCCESSIVE Specified for V T/H DD of 2.8 V to 3.6 V APPROXIMATION Logic voltage V ADC DRIVE = 1.65 V to 3.6 V Internal 2.5 V reference INPUT V MUX AD7291-EP I IN7 2C-compatible serial interface supports standard and fast speed modes SEQUENCER SCL Out of range indicator/alert function SDA CONTROL LOGIC Autocycle mode I2C INTERFACE AS1 TEMP AS0 Power-down current: 13 µA maximum SENSOR 20-lead LFCSP package VDRIVE
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ENHANCED PRODUCT FEATURES PD/RST ALERT
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Supports defense and aerospace applications (AQEC standard) 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 GENERAL DESCRIPTION
The AD7291-EP is a 12-bit, low power, 8-channel, successive The AD7291-EP includes a high accuracy band gap temperature approximation analog-to-digital converter (ADC) with an sensor, which is monitored and digitized by the 12-bit ADC to internal temperature sensor. give a resolution of 0.25°C. The device operates from a single 3.3 V power supply and The AD7291-EP offers a programmable sequencer, which features an I2C-compatible interface. The device contains a enables the selection of a preprogrammable sequence of 9-channel multiplexer and a track-and-hold amplifier with an channels for conversion. input bandwidth of 30 MHz. The device has an on-chip 2.5 V On-chip limit registers can be programmed with high and low reference that can be disabled to al ow the use of an external limits for the conversion results; an out-of-range indicator output reference. (ALERT) becomes active when the programmed high or low The AD7291-EP provides a 2-wire serial interface compatible limits are violated by the conversion result. This output can be with I2C interfaces. The I2C interface supports standard and fast used as an interrupt. I2C interface modes. The AD7291-EP normally remains in a Additional application and technical information can be found partial power-down state while not converting and powers up in the AD7291 data sheet. 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.
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Document Outline FEATURES ENHANCED PRODUCT FEATURES FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS OUTLINE DIMENSIONS ORDERING GUIDE