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AD7291BCPZ Datasheet(PDF) 1 Page - Analog Devices |
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AD7291BCPZ Datasheet(HTML) 1 Page - Analog Devices |
1 / 21 page 8-Channel, I2C, 12-Bit SAR ADC with Temperature Sensor Preliminary Technical Data AD7291 Rev. PrC Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityisassumedbyAnalogDevicesforitsuse,nor foranyinfringementsofpatentsorother rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights ofAnalog 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 ©2009 Analog Devices, Inc. All rights reserved. FEATURES 12 bit SAR ADC 8 single-ended inputs Channel sequencer functionality Analog Input Range 0 to 2.5V 12-bit temperature-to-digital converter Temperature sensor accuracy of ±2°C typical Temperature range: −40°C to +125°C Specified for V DD of 2.8 V to 3.6V Logic Voltage V DRIVE = 1.65V to 3.6V Power-down current : <10 µA Internal 2.5V Reference I2C-compatible serial interface supports standard & fast modes 20-lead LFCSP Functional Block Diagram Figure 1. GENERAL DESCRIPTION The AD7291 is a 12-bit, high speed, low power, 8-channel, successive approximation ADC with an internal temperature sensor. The part operates from a single 3.3V power supply and features an I2C®-compatible interface. The track-and-hold amplifier which can handle input frequencies of up to 70MHz, and a multiplexer allows samples from eight channels. Each AD7291 provides a 2-wire serial interface compatible with I2C interfaces. The AD7291 offers a programmable sequencer, which enables the selection of a pre-programmable sequence of channels for conversion. The device has an on-chip 2.5 V reference that can be disabled to allow the use of an external reference. The AD7291 includes a high accuracy band-gap temperature sensor, which is monitored and digitized by the12-bit ADC to give a resolution of 0.25°C. The AD7291 uses advanced design techniques to achieve very low power dissipation at high throughput rates. The part also offers flexible power/throughput rate management options and is offered in a 20 lead LFCSP package PRODUCT HIGHLIGHTS 1. Ideally suited to monitoring system variables in a variety of systems including telecommunications, process and industrial control 2. I2C-compatible serial interface. Standard and fast modes. 3. Eight Single-Ended Inputs with a Channel Sequencer. A consecutive sequence of channels can be selected on which the ADC cycles and converts. 4. Integrated temperature sensor with 0.25°C resolution. Table 1. AD7298 and Related Products Device Resolution Interface Features AD7298 12-Bit SPI 8 Channel ADC & Temp Sensor AD7291 12-Bit I2C 8 Channel ADC & Temp Sensor |
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