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AD7321:  500 kSPS, 2-Channel, Software-Selectable, True Bipolar Input, 12-Bit Plus Sign ADC

Product Details


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.

Product Highlights

  1. The AD7321 can accept true bipolar analog input signals, ±10 V, ±5 V, ±2.5 V, and 0 V to +10 V unipolar signals.
  2. The two analog inputs are configured as two single-ended inputs, one true differential input pair, or one pseudo differential input.
  3. A 500 kSPS serial interface. SPI®-/QSPI™-/DSP-/ MICROWIRE™-compatible interface.
  4. Low power, 18 mW, at a maximum throughput rate of 500 kSPS.
  5. Channel sequencer.

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
  • 500 kSPS throughput rate
  • 2 analog input channels with channel sequencer
  • Single-ended, true differential, and pseudo differential analog input capability
  • 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

Functional Block Diagram for AD7321

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Evaluation Kits & Symbols & Footprints

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Product Recommendations & Reference Designs

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Suggested Complementary Products


Recommended Input Buffer Amplifiers for the AD7321

  • 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 AD7321

  • For a precision 3.0V reference, we recommend AD780 or the REF193.
Recommended Voltage Regulators for the AD7321
  • For low dropout regulators with inputs up to 5V, we recommend the low noise ADP151 or the low power ADP160.
  • For high current switching regulators with inputs up to 5V, we recommend the low noise ADP2114.
Recommended Power Solutions
  • For selecting voltage regulator products, use ADIsimPower.

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Price, packaging, availability

AD7321 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD7321BRUZ Status: Production 14 ld TSSOP 14 Ind Tube, 96 $3.57 $3.04 Y  Material Info PCN Purchase Sample
AD7321BRUZ-REEL Status: Production 14 ld TSSOP 14 Ind Reel, 2500 - $3.04 Y  Material Info PCN Purchase
AD7321BRUZ-REEL7 Status: Production 14 ld TSSOP 14 Ind Reel, 1000 - $3.04 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.


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