GENERAL DESCRIPTION
The AD5381 is a complete, single-supply, 40-channel, 12-bit DAC available in a 100-lead LQFP package. All 40 channels have an on-chip output amplifier with rail-to-rail operation. The AD5381 includes a programmable internal 1.25 V/2.5 V, 10 ppm/°C reference, an on-chip channel monitor function that multiplexes the analog outputs to a common MON_OUT pin for external monitoring, and an output amplifier boost mode that allows optimization of the amplifier slew rate. The AD5381 contains a double-buffered parallel interface that features a 20 ns WR pulse width, an SPI/QSPI/MICROWIRE/DSP compatible serial interface with interface speeds in excess of 30 MHz, and an I2C compatible interface that supports a 400 kHz data transfer rate.

FEATURES
    Guaranteed monotonic
    INL error: ±1 LSB max
    On-chip 1.25 V/2.5 V, 10 ppm/°C reference
    Temperature range: –40°C to +85°C
    Rail-to-rail output amplifier
    Power-down
    Package type: 100-lead LQFP (14 mm × 14 mm)
    User Interfaces:
        Parallel
        Serial (SPI®/QSPI™/MICROWIRE™/DSP compatible,
            featuring data readback)
        I2C® compatible

INTEGRATED FUNCTIONS
    Channel monitor
    Simultaneous output update via LDAC
    Clear function to user programmable code
    Amplifier boost mode to optimize slew rate
    User programmable offset and gain adjust
    Toggle mode enables square wave generation
    Thermal monitors

APPLICATIONS
    Variable optical attenuators (VOA)
    Level setting (ATE)
    Optical micro-electro-mechanical systems (MEMs)
    Control systems
    Instrumentation