AD7329 Datasheet | Analog Devices

.. 1 MSPS, 8-Channel, Software-Selectable, True Bipolar Input, 12-Bit Plus Sign ADC AD7329 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 Eight analog input channels with channel sequencer Single-ended true differential and pseudo differential analog input capability High analog input impedance MUXOUT and ADCIN pins allow separate access to mux and ADC Low power: 21 m W Temperature indicator Full power signal bandwidth: 20 MHz Internal 2.5 V reference High speed serial interface i CMOS™ process technology 24-lead TSSOP package Power-down modes FUNCTIONAL BLOCK DIAGRAM MUXOUT+ MUXOUT- ADC IN- ADC IN+ VDD REFIN/REFOUT VCC 2.5V VREF VIN0 VIN1 VIN2 VIN3 VIN4 VIN5 VIN6 VIN7 DOUT CHANNEL SEQUENCER CONTROL LOGIC AND REGISTERS SCLK CS DIN 05402-001 I/P MUX T/H 13-BIT SUCCESSIVE APPROXIMATION ADC VSS AGND VDRIVE Figure 1. GENERAL DESCRIPTION The AD7329 1 is an 8-channel, 12-bit plus sign successive approximation ADC designed on the i CMOS (industrial CMOS) process. i CMOS is a process bining high voltage CMOS and low voltage CMOS. 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 AD7329 can accept true bipolar analog input signals. The AD7329 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 AD7329 can be programmed to be single-ended, true differential, or pseudo differential. The ADC contains a 2.5 V internal reference. The AD7329 also allows for...