Book Analog Interfacing to Embedded Microprocessors
erence voltage. The output can source or sink several milliamps.
Like ADCs, DACs are available with both parallel and serial interfaces. The
Analog Devices AD5300 is an 8-bit DAC with a rail-to-rail output and an SPI-
compatible interface. Like the AD7801, the AD5300 can operate with supply
voltages from 2.7 to 5.5 volts.
Specialized DACs
DACs designed for special applications are also available. The Analog Devices
ADV7120 is a triple 8-bit video DAC designed for video use. The part contains
3 DACs for the RGB (red green blue) video signals. The ADV7120 also has
SYNC and BLANK inputs that force all three outputs to the sync and blank-
ing levels, respectively (Figure 6.16). Other specialized DACs include audio
parts with built-in volume control and mute functions, and DACs that are opti-
mized for use in voice transmission systems such as telephones.
Digital Potentiometers
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