500 kSPS, 2-Channel, Software-Selectable, True Bipolar Input, 12-Bit Plus Sign ADC
The AD7321 can accept true bipolar analog input signals. The AD7321 has four software-selectable input ranges, ±10 V, ±5 V, ±2.5 V, and 0 V to +10 V. Each analog input channel is independently programmed to one of the four input ranges. The analog input channels on the AD7321 are programmed to be single-ended, true differential, or pseudo differential.
The ADC contains a 2.5 V internal reference. The AD7321 also allows for external reference operation. If a 3 V reference is applied to the REFIN/OUT pin, the AD7321 can accept a true bipolar ±12 V analog input. A minimum of ±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 500 kSPS.
- The AD7321 can accept true bipolar analog input signals, ±10 V, ±5 V, ±2.5 V, and 0 V to +10 V unipolar signals.
- The two analog inputs are configured as two single-ended inputs, one true differential input pair, or one pseudo differential input.
- A 500 kSPS serial interface. SPI®-/QSPI™-/DSP-/ MICROWIRE™-compatible interface.
- Low power, 18 mW, at a maximum throughput rate of 500 kSPS.
- Channel sequencer.
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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.
The EVAL-AD7321CBZ is a fully featured evaluation kit for the AD7321. This board operates in stand alone mode or in conjunction with the Evaluation Controller board . When operated with the Evaluation Controller board, 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 Evaluation Controller board.
Recommended Input Buffer Amplifiers
- For low noise and low power applications , we recommend the ADA4841-1, ADA4932-1, ADA4841-2 or the AD8137 .
- For low noise and low frequency applications at medium supply voltages( up to +-13V) , we recommend the AD8610 or the AD8620 .
- For low noise and high frequency , we recommend the AD8021, ADA4899-1 or the AD8022 .
- For low noise and low frequency at high supply voltages( up to +-18V) , we recommend the AD8597, ADA4627-1 or the AD8599 .
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.
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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.