AD7685:  16-Bit, 250 kSPS PulSAR® ADC in MSOP/QFN

The AD7685 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 ...More

AD7685:  16-Bit, 250 kSPS PulSAR® ADC in MSOP/QFN

Product Description

The AD7685 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 AD7685 is housed in a 10-lead MSOP or a 10-lead QFN (LFCSP) with operation specified from −40°C to +85°C.

Applications

  • Battery-powered equipment
  • Medical instruments
  • Mobile communications
  • Personal digital assistants (PDAs)
  • Data acquisition
  • Instrumentation
  • Process controls

    • Data Sheet, Rev. B, 3/07

    Features

    • 16-bit resolution with no missing codes
    • Throughput: 250 kSPS
    • INL: ±0.6 LSB typical, ±2 LSB maximum (±0.003% of FSR)
    • SINAD: 93.5 dB @ 20 kHz
    • THD: −110 dB @ 20 kHz
    • Pseudo differential analog input range 0 V to VREF with VREF up to VDD
    • No pipeline delay
    • Single-supply operation 2.3 V to 5.5 V with 1.8 V to 5 V logic interface
    • Serial interface SPI®-/QSPI™-/MICROWIRE™-/DSP-compatible
    • Daisy-chain multiple ADCs, BUSY indicator
    • Power dissipation
      1.4 μW @ 2.5 V/100 SPS
      1.35 mW @ 2.5 V/100 kSPS, 4 mW @ 5 V/100 kSPS
    • Standby current: 1 nA

    Diagrams

    AD7685 Diagram
    Functional Block Diagram for AD7685

    Specifications

    Resolution (Bits) 16bit
    T-Put Rate 250kSPS
    # Chan 1
    Supply V Single(+2.3 to +5.5),Single(+2.5),Single(+3),Single(+3.3),Single(+5)
    Pwr Diss (max) n/a
    Interface Ser,SPI
    Ain Range (Vref) p-p
    SNR (dB) 93.5dB
    Pkg Type CSP,SOP

    AD7190 - 4.8 kHz Ultra-Low Noise 24-Bit Sigma-Delta ADC with PGA

    AD7356 - Differential Input, Dual, Simultaneous Sampling, 5 MSPS, 12-Bit, SAR ADC

    AD7352 - Differential Input, Dual, Simultaneous Sampling, 3 MSPS, 12-Bit, SAR ADC

    AD7699 - 16-Bit, 8-Channel, 500 kSPS PulSAR ADC

    Subscribe to New Products Feed More
    Part# Res Throughput Rate # of Inputs Operating Pwr Diss
    AD10678 16 80MSPS 1 8W
    AD7688 16 500KSPS 1 21.5mW
    AD9260 16 2.5MSPS 1 637mW
    AD9261 16 160MSPS 1 473mW
    AD7666 16 500KSPS 1 90mW
    AD7677 16 1MSPS 1 130mW
    AD7667 16 1MSPS 1