Features and Benefits
- 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
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.
- The AD7328 can accept true bipolar analog input signals, ±10 V, ±5 V, ±2.5 V, and 0 V to +10 V unipolar signals
- 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
- 1 MSPS serial interface. SPI®-/QSPI™-/DSP-/MICROWIRE™-compatible interface
- Low power, 30 mW, at a maximum throughput rate of 1 MSPS
- Channel sequencer
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
The EVAL-AD7328SDZ is a fully featured evaluation kit for the AD7328. This board operates in standalone mode or in conjunction with the System Development Platform, EVAL-SDP-CB1Z . When operated with the System Development Platform software is provided enabling the user to perform detailed analysis of the ADC's performance. This software includes the technical note describing the operation and set up of the evaluation board in standalone operation or when operated with the System Development Platform . When operated in standalone mode the ADZS-BRKOUT-EX3 break out board is recommended for access to various control pins.
The SDP Controller board is a separate list item in the ordering guide below (EVAL-SDP-CB1Z). If you have not previously purchased an SDP Controller board, please do so to ensure a full evaluation setup.
Software & Systems Requirements
Tools & Simulations
AD7328 Companion Parts
Recommended Input Buffer Amplifiers
- For low noise and low frequency at high supply voltages( up to +-18V): AD8597, ADA4627-1, AD8599.
- For low noise and high frequency: AD8021, ADA4899-1, AD8022.
- For low noise and low frequency applications at medium supply voltages( up to +-13V): AD8610, AD8620.
- For low noise and low power applications: ADA4841-1, ADA4932-1, ADA4841-2, AD8137.
Recommended External References
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
Sample & Buy
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.