AD7685BRMZRL7

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1. DESCRIPTION

The AD7685BRMZRL7 is a 16-bit, charge redistribution successive approximation, analog-to-digital converter (ADC) that operates from a single power supply, VDD, between 2.3 V to 5.5 V. It contains a 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, short aperture delay, track-and-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. Power dissipation 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 or 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 AD7685BRMZRL7 is housed in a 10-lead MSOP or a 10-lead LFCSP with operation specified from −40°C to +85°C.

2. FEATURES

    1. 16-bit resolution with no missing codes

    2. Throughput: 250 kSPS

    3. INL: ±0.6 LSB typical, ±2 LSB maximum (±0.003% of FSR)

    4. SINAD: 93.5 dB at 20 kHz

    5. THD: −110 dB at 20 kHz

    6. Pseudo differential analog input range

        - 0 V to VREF with VREF up to VDD

    7. No pipeline delay

    8. Single-supply operation 2.3 V to 5.5 V with 1.8 V to 5 V logic interface

    9. Proprietary serial interface: SPI-/QSPI™-/MICROWIRE™-/DSPcompatible

  10. Daisy-chain multiple ADCs, BUSY indicator

  11. Power dissipation

        - 1.4 µW at 2.5 V/100 SPS

        - 1.35 mW at 2.5 V/100 kSPS, 4 mW at 5 V/100 kSPS

  12. Standby current: 1 nA

  13. 10-lead package: MSOP (MSOP-8 size) and 3 mm × 3 mm LFCSP (SOT-23 size)

  14. Pin-for-pin-compatible with 10-lead MSOP/PulSAR®ADCs

3. APPLICATIONS

    1. Battery-powered equipment 

        - Medical instruments

        - Mobile communications

        - Personal digital assistants (PDAs)

    2. Data acquisition

    3. Instrumentation

    4. Process controls