Features and Benefits
- 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
- 2 analog input channels with channel sequencer
- Single-ended, true differential, and pseudo differential analog input capability
- 500 kSPS throughput rate
- High analog input impedance
- Low power: 18 mW
- Full power signal bandwidth: 22 MHz
- Internal 2.5 V reference
- High speed serial interface
- See data sheet for additional features
The AD7321 is a 2-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 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.
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 (2)
Not recommended for new designs. For new designs, please see the EVAL-AD7327.
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.
The EVAL-AD7327SDZ is a fully featured evaluation kit for the AD7327. 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.
Documentation & Resources
Software & Systems Requirements
Tools & Simulations
AD7321 Companion Parts
Recommended Input Buffer Amplifiers
- For low noise and low power applications: ADA4841-1, ADA4932-1, ADA4841-2, AD8137.
- For low noise and low frequency applications at medium supply voltages( up to +-13V): AD8610, AD8620.
- For low noise and high frequency: AD8021, ADA4899-1, AD8022.
- For low noise and low frequency at high supply voltages( up to +-18V): AD8597, ADA4627-1, 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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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.