GENERAL DESCRIPTION
The AD7328 is an 8-Channel, 12-Bit plus Sign Successive Approximation ADC. The ADC has a high speed serial interface that can operate at throughput rates up to 1 Msps.
The AD7328 can accept true bipolar Analog Input signals. The AD7328 has four software selectable inputs Ranges, ±10V, ±5V, ±2.5V and 0 to 10V. Each analog input channel can be independently programmed to one of the four input ranges.
The Analog input channels on the AD7328 can be programmed to be Single-Ended, true Differential or Pseudo Differential.
The ADC contains a 2.5V Internal reference. The AD7328 also allows for external Reference operation. If a 3V reference is applied the REF IN/OUT pin the AD7328 can accept a true Bipolar ±12V Analog Input. VDD and VSS supplies of ±12V are required for the ±12V Input Range.

FEATURES
• 12-Bit plus Sign SAR ADC
• True Bipolar Input Ranges
• Software Selectable Input Ranges
   ± 10V, ± 5V, ± 2.5V, 0 to 10V
• 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
• Low Power:- 26 mW max
• Full Power Signal Bandwidth: 7 MHz
• Internal 2.5 V Reference
• High Speed Serial Interface
• Power Down Modes
• 20-Lead TSSOP package
• iCMOSTM Process Technology
• For four and two channel equivalent devices see
   AD7324 and AD7322 respectively.