AD7324 Datasheet | Analog Devices

.. 4-Channel, Software-Selectable, True Bipolar Input, 12-Bit Plus Sign ADC AD7324 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 1 MSPS throughput rate Four analog input channels with channel sequencer Single-ended, true differential, and pseudo differential analog input capability High analog input impedance Low power: 21 m W Full power signal bandwidth: 22 MHz Internal 2.5 V reference High speed serial interface Power-down modes 16-lead TSSOP package i CMOS™ process technology FUNCTIONAL BLOCK DIAGRAM VDD REFIN/OUT VCC 2.5V VREF I/P MUX T/H VIN0 VIN1 VIN2 VIN3 13-BIT SUCCESSIVE APPROXIMATION ADC DOUT CHANNEL SEQUENCER CONTROL LOGIC AND REGISTERS SCLK CS DIN VDRIVE AGND VSS DGND 04864-001 Figure 1. GENERAL DESCRIPTION The AD7324 is a 4-channel, 12-bit plus sign, successive approximation ADC designed on the i CMOS (industrial CMOS) process. i CMOS is a process bining high voltage silicon with submicron CMOS and plementary 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, i CMOS ponents can accept bipolar input signals while providing increased performance, dramatically reduced power consumption, and reduced package size. The AD7324 can accept true bipolar analog input signals. The AD7324 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 AD7324 can be programmed to be single-ended, true differential, or pseudo differential. The ADC contains a 2.5 V internal reference. The AD7324 also allows for external reference operation. If a 3 V reference is applied to the REFIN/OUT pin, the AD7324 can accept...