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AD7291 Datasheet(PDF) 1 Page - Analog Devices |
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AD7291 Datasheet(HTML) 1 Page - Analog Devices |
1 / 28 page 8-Channel, I2C, 12-Bit SAR ADC with Temperature Sensor AD7291 Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2011 Analog Devices, Inc. All rights reserved. FEATURES 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 I2C-compatible serial interface supports standard and fast speed modes Out of range indicator/alert function Autocycle mode Power-down current: 12 μA maximum Temperature range: −40°C to +125°C 20-lead LFCSP package FUNCTIONAL BLOCK DIAGRAM TEMP SENSOR 12-BIT SUCCESSIVE APPROXIMATION ADC INPUT MUX T/H VDD GND PD/RST SCL SDA AS1 AS0 VDRIVE VIN7 VIN0 CONTROL LOGIC I2C INTERFACE SEQUENCER VREF BUF REF AD7291 ALERT Figure 1. GENERAL DESCRIPTION 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, which supports 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. Table 1. AD7291 and Related Products Device Resolution Interface Features AD7291 12-bit I2C 8-channel, I2C, 12-bit SAR ADC with temperature sensor AD7298 12-bit SPI 8-channel, 1 MSPS, 12-bit SAR ADC with temperature sensor |
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