DACs work with optical modules

-June 25, 2017

A pair of DACs from Analog Devices, the 12-bit AD5767 and 16-bit AD5766 reduce the footprint of wired telecommunication systems. These highly integrated 16-channel devices come with all the required bias ranges for coherent optical systems of medium-haul to long-haul, fiber-based telecommunication deployments. They are particularly well-suited for optical modules and electro-optical functions, such as bias control, including Mach-Zehnder modulator-bias control.

Housed in small 4×4-mm WLCSP and 6×6-mm LFCSP packages, the converters provide a range of unipolar or bipolar output voltages from a user-supplied 2.5 V reference. Outputs can be adjusted down to -20 V or as high as +14 V, and output buffers sink or source up to 20 mA. The DACs can impose low-frequency dithering on these outputs if needed, eliminating the need for external circuitry.

In addition to an integrated output multiplexer, both converters employ a four-wire serial interface that operates at clock rates of up to 50 MHz for write mode and is compatible with SPI, QSPI, Microwire, and DSP interface standards. The pin- and footprint-compatible AD5766 is functionally identical to the AD5767, but with 16-bit resolution.

Operating over a temperature range of -40°C to +105°C, the AD5767 and AD5766 cost $31.50 and $35 each in lots of 1000 units. The AD5767 is available now, while the AD5766 will be available in August 2017.

AD5767 product page

Analog Devices, www.analog.com

Find more datasheets on products like this one at Datasheets.com, searchable by category, part #, description, manufacturer, and more.

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