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

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, ±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.

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
  • 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.
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
Analog to Digital Converters
Software & Systems Requirements
Data Sheets
Documentnote
AD7321: 500 kSPS, 2-Channel, Software-Selectable, True Bipolar Input, 12-Bit Plus Sign ADC Data Sheet (Rev. B)PDF 571 kB
Order Information
Part NumberPackagePacking QtyTemp RangePrice 100-499Price 1000+RoHS
AD7321BRUZ Production14 ld TSSOPOTH 96-40 to 85C3.573.04Y
AD7321BRUZ-REEL Production14 ld TSSOPREEL 2500-40 to 85C03.04Y
AD7321BRUZ-REEL7 Production14 ld TSSOPREEL 1000-40 to 85C03.04Y
Evaluation Boards
Part NumberDescriptionPriceRoHS
EVAL-AD7327SDZEvaluation Board59Y
EVAL-SDP-CB1ZEvaluation Controller Board99Y
Reference Materials
AD7321: 500 kSPS, 2-Channel, Software-Selectable, True Bipolar Input, 12-Bit Plus Sign ADC Data Sheet (Rev. B) ad7321
AD7321参考代码 ad7321
AD7321 评估软件 ad7321
MS-2210:高速ADC的电源设计 ad9861