AD5668:  Octal, 16-Bit D/A Converter with 5 ppm/°C On-Chip Reference in 16-Lead TSSOP

AD5628/AD5648/AD5668 devices are low power, octal, 12-/14-/16-bit, buffered voltage-output DACs. All devices operate from a single 2.7 V to 5.5 V supply and are guaranteed monotonic by design. ...More

AD5668:  Octal, 16-Bit D/A Converter with 5 ppm/°C On-Chip Reference in 16-Lead TSSOP

Product Description

AD5628/AD5648/AD5668 devices are low power, octal, 12-/14-/16-bit, buffered voltage-output DACs. All devices operate from a single 2.7 V to 5.5 V supply and are guaranteed monotonic by design.

The AD5628/AD5648/AD5668 have an on-chip reference with an internal gain of 2. The AD5628/AD5648/AD5668-1 have a 1.25 V 5 ppm/°C reference, giving a full-scale output range of 2.5 V; the AD5628/AD5648/AD5668-2, -3 have a 2.5 V 5 ppm/°C reference, giving a full-scale output range of 5 V. The on-board reference is off at power-up, allowing the use of an external reference. The internal reference is enabled via a software write.

The part incorporates a power-on reset circuit that ensures that the DAC output powers up to 0 V (AD5628/AD5648/AD5668-1, -2) or midscale (AD5668-3) and remains powered up at this level until a valid write takes place. The part contains a power-down feature that reduces the current consumption of the device to 400 nA at 5 V and provides software-selectable output loads while in power-down mode for any or all DAC channels.

The outputs of all DACs can be updated simultaneously using the LDAC function, with the added functionality of user-selectable DAC channels to simultaneously update. There is also an asynchronous CLR that updates all DACs to a user-programmable code—zero scale, midscale, or full scale.

The AD5628/AD5648/AD5668 utilize a versatile 3-wire serial interface that operates at clock rates of up to 50 MHz and is compatible with standard SPI®, QSPI™, MICROWIRE™, and DSP interface standards. The on-chip precision output amplifier enables rail-to-rail output swing.

Product Highlights

  1. Octal, 12-/14-/16-bit DAC.
  2. On-chip 1.25 V/2.5 V, 5 ppm/°C reference.
  3. Available in 14-lead/16-lead TSSOP.
  4. Power-on reset to 0 V or midscale.
  5. Power-down capability. When powered down, the DAC typically consumes 200 nA at 3 V and 400 nA at 5 V.

Applications

  • Process control
  • Data acquisition systems
  • Portable battery-powered instruments
  • Digital gain and offset adjustment
  • Programmable voltage and current sources
  • Programmable attenuators

    • Features

    • Low power, smallest-pin-compatible octal DACs
      AD5668: 16 bits
      AD5648: 14 bits
      AD5628: 12 bits
    • 14-lead/16-lead TSSOP
    • On-chip 1.25 V/2.5 V, 5 ppm/°C reference
    • Power down to 400 nA @ 5 V, 200 nA @ 3 V
    • 2.7 V to 5.5 V power supply Guaranteed monotonic by design
    • Power-on reset to zero scale or midscale
    • 3 power-down functions
    • Hardware LDAC and LDAC override function
    • CLR function to programmable code
    • Rail-to-rail operation

    Diagrams

    AD5668 Diagram
    Functional Block Diagram for AD5668

    Specifications

    Resolution (Bits) 16bit
    DAC Update Rate 95kSPS
    DAC Settling Time 6µs
    # DAC Outputs 8
    DAC Type Voltage Out
    DAC Input Format Ser,SPI
    Output FSR (Uni 2Vref),(Uni Vref)
    Ref Int/Ext Int/Ext
    Supply Vnom Single(+2.7 to +5.5),Single(+2.7),Single(+3),Single(+3.3),Single(+5)
    Pwr Diss 2.15mW
    Package SOP

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    Part# Bits Update Rate Settling Time # Outputs
    AD5668 16 95KSPS 6µs 8
    AD5678 16 95KSPS 6µs 8
    AD5648 14 95KSPS 6µs 8
    AD7568 12 2MSPS 500ns 8
    AD5544 16 500KSPS 2µs 4
    AD5328 12 167KSPS 6µs 8
    AD5628 12 95KSPS 6µs 8
    AD5664 16 223KSPS 4µs 4
    AD5664R 16 220KSPS 4µs 4
    AD5665 16 333KSPS 4µs 4
    AD5665R 16 333KSPS 4µs 4
    Pricing, Packaging & Availability

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    *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.
    **Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.

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