AD5767 from Analog Devices includes 16 12bit voltage output DACs in the same package, and is intended to reduce the system footprint for wired telecommunications systems, providing the necessary bias ranges for the coherent fibre-based medium and long-haul optical systems – particularly indium phosphide Mach-Zehnder modulator biasing.
“The DAC delivers a broad range of unipolar or bipolar output voltages from the user-supplied 2.5V reference,” said component distributor Mouser, which is stocking the AD5767. “Engineers can monitor each of the DAC’s 16 channels using the integrated output voltage multiplexer, and adjust each output from a minimum output voltage of -20V to a maximum output voltage of +14V.”
Every channel has an output buffer that can sink or source up to 20mA. Output settling time is typically 10μs.
For communications, there is a versatile four-wire serial interface that clocks at up 50MHz (for write mode) and is compatible SPI, QSPI, Microwire, and DSP interface standards. A daisy-chain mode allows more than one DAC to be strung on the same bus.
If needed, the DAC can provide low-frequency dithering to allow tone signals to be coupled to any of the 16 DAC output channels.
Dither signals must be between 10kHz and 100kHz and below the maximum ac amplitude of 0.25Vp-p, and must not stray outside 0V to AVcc including dc offset.
Internal per-channel attenuation and inversion is available. “Due to the nature of the internal dither circuitry, the dc value of the output can shift, and the shift can be compensated for,” said ADI.
Package choice is 4 x4 mm WLCSP or 6 x 6mm LFCSP. Operation is across -40 to 105°C.
There is an evaluation board, EVAL-AD5767, which adds an ADP5071 switching regulator for power and allows control via USB from a Windows-based PC running the firms ACE (analysis, control, evaluation) evaluation software which confugures the chip through a graphical user interface.
Other potential application include: industrial automation, analogue output modules, test equipment, measurement equipment and data acquisition.
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