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AD7327 Datasheet(PDF) 1 Page - Analog Devices |
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AD7327 Datasheet(HTML) 1 Page - Analog Devices |
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1 / 36 page  500 kSPS, 8-Channel, Software-Selectable, True Bipolar Input, 12-Bit Plus Sign ADC AD7327 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 ©2006 Analog Devices, Inc. All rights reserved. FEATURES 12-bit plus sign SAR ADC True bipolar input ranges Software-selectable input ranges ±10 V, ±5 V, ±2.5 V, 0 V to +10 V 500 kSPS throughput rate Eight analog input channels with channel sequencer Single-ended, true differential, and pseudo differential analog input capability High analog input impedance Low power: 17 mW Temperature indicator Full power signal bandwidth: 22 MHz Internal 2.5 V reference High speed serial interface Power-down modes 20-lead TSSOP package iCMOS™ process technology FUNCTIONAL BLOCK DIAGRAM VIN0 DOUT SCLK CS DIN VDRIVE VIN1 VIN2 VIN3 VIN4 VIN5 VIN6 VIN7 VDD REFIN/OUT VCC AGND VSS DGND CONTROL LOGIC AND REGISTERS 13-BIT SUCCESSIVE APPROXIMATION ADC T/H 2.5V VREF I/P MUX CHANNEL SEQUENCER AD7327 TEMPERATURE INDICATOR Figure 1. GENERAL DESCRIPTION The AD73271 is an 8-channel, 12-bit plus sign successive approximation ADC designed on the iCMOS (industrial CMOS) process. iCMOS is a process combining high voltage silicon with submicron CMOS and complementary bipolar technologies. It enables the development of a wide range of high performance analog ICs capable of 33 V operation in a footprint that no previous generation of high voltage parts could achieve. Unlike analog ICs using conventional CMOS processes, iCMOS components can accept bipolar input signals while providing increased performance, dramatically reduced power consumption, and reduced package size. The AD7327 can accept true bipolar analog input signals. The AD7327 has four software-selectable input ranges, ±10 V, ±5 V, ±2.5 V, and 0 V to +10 V. Each analog input channel can be independently programmed to one of the four input ranges. The analog input channels on the AD7327 can be programmed to be single-ended, true differential, or pseudo differential. The ADC contains a 2.5 V internal reference. The AD7327 also allows for external reference operation. If a 3 V reference is applied to the REFIN/OUT pin, the AD7327 can accept a true bipolar ±12 V analog input. Minimum ±12 V VDD and VSS supplies are required for the ±12 V input range. The ADC has a high speed serial interface that can operate at throughput rates up to 500 kSPS. PRODUCT HIGHLIGHTS 1. The AD7327 can accept true bipolar analog input signals, ±10 V, ±5 V, ±2.5 V, and 0 V to +10 V unipolar signals. 2. The eight analog inputs can be configured as eight single- ended inputs, four true differential inputs, four pseudo differential inputs, or seven pseudo differential inputs. 3. 500 kSPS serial interface. SPI®-/QSPI™-/DSP-/MICROWIRE™- compatible interface. 4. Low power, 17 mW, at a maximum throughput rate of 500 kSPS. 5. Channel sequencer. Table 1. Similar Devices Device Number Throughput Rate Number of bits Number of Channels AD7329 1000 kSPS 12-bit plus sign 8 AD7328 1000 kSPS 12-bit plus sign 8 AD7324 1000 kSPS 12-bit plus sign 4 AD7323 500 kSPS 12-bit plus sign 4 AD7322 1000 kSPS 12-bit plus sign 2 AD7321 500 kSPS 12-bit plus sign 2 1 Protected by U.S. Patent No. 6,731,232. |
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