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AD7328:  Software Selectable, True Bipolar Input, 8-Channel, 12-Bit Plus Sign A/D Converter

Product Details

The AD7328 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 AD7328 can accept true bipolar analog input signals. The AD7328 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 AD7328 can be programmed to be single-ended, true differential, or pseudo differential.

The ADC contains a 2.5 V internal reference. The AD7328 also allows for external reference operation. If a 3 V reference is applied to the REFIN/OUT pin, the AD7328 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 1 MSPS.

Product Highlights

  1. The AD7328 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 input pairs, four pseudo differential inputs, or seven pseudo differential inputs
  3. 1 MSPS serial interface. SPI®-/QSPI™-/DSP-/MICROWIRE™-compatible interface
  4. Low power, 30 mW, at a maximum throughput rate of 1 MSPS
  5. Channel sequencer


  • 12-Bit plus Sign SAR ADC
  • True Bipolar Input Ranges
  • Software Selectable Input Ranges: ± 10V, ± 5V, ± 2.5V, 0 to 10V
  • 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
  • Full Power Signal Bandwidth: >13 MHz
  • Internal 2.5 V Reference
  • High Speed Serial Interface - 1 MSPS Throughput
  • For four and two channel equivalent devices, see AD7324, AD7322

Functional Block Diagram for AD7328

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Title Content Type File Type
AD7328: 8-Channel, Software-Selectable,True Bipolar Input, 12-Bit Plus Sign ADC Data Sheet (Rev C, 01/2014) (pdf, 873 kB) Data Sheets PDF
CN-0047: Using the AD7328 8-Channel ADC in Applications with Single-Ended Industrial-Level Signals  (pdf, 109 kB) Circuit Note PDF
UG-419: Evaluating the AD7327/AD7328  (pdf, 1634 kB) User Guides PDF
MS-2210: Designing Power Supplies for High Speed ADC  (pdf, 327 kB) Technical Articles PDF
ICs for Programmable Logic Control and Distributed Control Systems  (pdf, 976 kB)
Analog Devices leadership in industrial IC technology, with the development of the iCMOS™ and iPolar™ processes, has uniquely defined high voltage and low voltage integration to deliver smaller, higher performance, and more cost effective ICs for industrial systems.
Overview PDF
Leading Inside Advertorials: A Whole New Value Equation for Industrial Designs  (pdf, 157 kB) Overview PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
BeMicro FPGA Project for AD7328 with Nios driver FPGA HDL HTML
AD7328 FMC-SDP Interposer & Evaluation Board / Xilinx KC705 Reference Design FPGA HDL HTML
AD7328 - Microcontroller No-OS Driver Device Drivers HTML

Evaluation Kits & Symbols & Footprints

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Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

Product Recommendations & Reference Designs

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Companion Products

Suggested Companion Products

Recommended Input Buffer Amplifiers for the AD7328

  • For low noise and low frequency at high supply voltages( up to +-18V), we suggest the AD8597, ADA4627-1 or the dual AD8599.

  • For low noise and low frequency applications at medium supply voltages( up to +-13V), we suggest the AD8610, or the dual AD8620.
Recommended External References for the AD7328
  • For a precision 3.0V reference, we recommend AD780 or the REF193.
Recommended Power Solutions
  • For selecting voltage regulator products, use ADIsimPower.

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Price, packaging, availability

AD7328 Model Options
Model Package Pins Temp.
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
AD7328BRUZ Status: Production 20 ld TSSOP 20 Ind Tube, 75 $7.44 $6.33 Y  Material Info PCN Purchase Sample
AD7328BRUZ-REEL Status: Production 20 ld TSSOP 20 Ind Reel, 2500 - $6.33 Y  Material Info PCN Purchase
AD7328BRUZ-REEL7 Status: Production 20 ld TSSOP 20 Ind Reel, 1000 - $6.33 Y  Material Info PCN Purchase
Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

AD7328 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
EVAL-AD7328SDZ Status: Production Evaluation Board $59.00 Yes -
EVAL-SDP-CB1Z Status: Production Evaluation Controller Board $99.00 Yes -

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

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