AD5348BRUZ

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1. DESCRIPTION

The AD5348BRUZ are octal 12-bit DACs, operating from a 2.5 V to 5.5 V supply. These devices incorporate an on-chip output buffer that can drive the output to both supply rails, and also allow a choice of buffered or unbuffered reference input. The AD5348BRUZ have a parallel interface. CS selects the device and data is loaded into the input registers on the rising edge of WR. A readback feature allows the internal DAC registers to be read back through the digital port. The GAIN pin on these devices allows the output range to be set at 0 V to VREF or 0 V to 2 × VREF. Input data to the DACs is double-buffered, allowing simultaneous update of multiple DACs in a system using the LDAC pin. An asynchronous CLR input is also provided, which resets the contents of the input register and the DAC register to all zeros. These devices also incorporate a power-on reset circuit that ensures that the DAC output powers on to 0 V and remains there until valid data is written to the device. All three parts are pin compatible, which allows users to select the amount of resolution appropriate for their application without redesigning their circuit board.

2. FEATURES

    1. AD5348: octal 12-bit DAC

    2. Low power operation: 1.4 mA (max) at 3.6 V

    3. Power-down to 120 nA at 3 V, 400 nA at 5 V

    4. Guaranteed monotonic by design over all codes

    5. Rail-to-rail output range: 0 V to VREF or 0 V to 2 × VREF

    6. Power-on reset to 0 V

    7. Simultaneous update of DAC outputs via LDAC pin

    8. Asynchronous CLR facility

    9. Readback

  10. Buffered/unbuffered reference inputs

  11. 20 ns WR time

  12. 38-lead TSSOP/6 mm × 6 mm 40-lead LFCSP packaging

  13. Temperature range: –40°C to +105°C

3. APPLICATIONS

    1. Portable battery-powered instruments

    2. Digital gain and offset adjustment

    3. Programmable voltage and current sources

    4. Optical networking

    5. Automatic test equipment

    6. Mobile communications

    7. Programmable attenuators

    8. Industrial process control