Alternative Parts

  • AD7944
    AD7944

    Faster Throughput up to 2.5Msps, with Pseudo Differential Inputs

Overview

Features and Benefits

  • 14-bit resolution with no missing codes
  • Throughput: 500 kSPS
  • INL: ±0.4 LSB typical, ±1 LSB maximum (±0.0061% of FSR)
  • SINAD: 85 dB at 20 kHz
  • THD: −100 dB at 20 kHz
  • Pseudo differential analog input range
    • 0 V to REF with REF up to VDD
  • No pipeline delay
  • Single-supply 5 V operation with 1.8 V/2.5 V/3 V/5 V logic interface
  • Proprietary serial interface
    • SPI-/QSPI™-/MICROWIRE™-/DSP-compatible
  • Daisy-chain multiple ADCs and BUSY indicator
  • Power dissipation
    • 3.3 mW at 5 V/100 kSPS
    • 3.3 μW at 5 V/100 SPS
  • Standby current: 1 nA
  • 10-lead MSOP (MSOP-8 size) and
    • 3 mm × 3 mm LFCSP (SOT-23 size)
  • Pin-for-pin compatible with the 16-bit AD7686

Product Details

The AD7946 is a 14-bit, 500 kSPS, charge redistribution successive-approximation Analog-to-Digital Converter which operates from a single 5V power supply, VDD. It contains a very low power high-speed 16-bit sampling ADC with no missing codes, an internal conversion clock and a versatile serial interface port. The part also contains a low noise, wide bandwidth, very short aperture delay track/hold circuit. On the CNV rising edge, it samples an analog input IN+ between 0 V to REF with respect to a ground sense IN-. The reference voltage REF is applied externally and can be set up to the supply voltage.

Its power scales linearly with throughput.

The SPI compatible serial interface also features the ability, using the SDI input, to daisy chain several ADCs on a single 3 wire bus and provides an optional Busy indicator. It is compatible with 1.8 V, 2.5 V, 3 V or 5 V logic using the separate supply VIO.

The AD7946 is housed in a 10-lead µSOIC or 10-lead QFN (LFCSP) with operation specified from –40°C to +85°C.

Applications

  • Battery-powered equipment
  • Data acquisition
  • Instrumentation
  • Medical instruments
  • Process control

Product Lifecycle icon-recommended 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)

Tools & Simulations

Precision ADC Driver Tool - BETA

The Precision ADC Driver Tool is a web application that simulates the performance of precision ADC and driver combinations. Potential issues with driver selection, kickback settling, and distortion are flagged, and design tradeoffs can be quickly evaluated. Simulations and calculations include system noise, distortion, and settling of the ADC input

Precision ADC Driver Tool - BETA

IBIS Models

AD7685 IBIS Models

Product Recommendations

AD7946 Companion Parts

Recommended Digital Isolators

  • For SPI Interface, low power, 5.0 kVrms isolation: ADUM4401.
  • For SPI Interface, lowest power, 2.5 kVrms isolation: ADUM1401.
  • For SPI Interface, smallest package, low voltage I/O (1.8 V to 5.5 V): ADUM3481.
  • For SPI Interface, enhanced system-level ESD performance, 2.5 kVrms isolation: ADUM3401.

Recommended Driver Amplifiers

Recommended External Voltage References

Design Resources

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.

PCN-PDN Information

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Evaluation Boards Pricing displayed is based on 1-piece.
Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.
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.