CMOS DACs in the Voltage-Switching Mode

Can Work From a Single Supply, Including Output Op Amp; Have Fast Response, No Offset-Induced Nonlinearity

The versatile R-2R ladder attenuator can be used as either a voltage or a currnet source, and it may be used in either a current-steering or a voltage-switching mode. Figure 1a shows the familiar connection of a CMOS d/a converter, such as the 10-bit AD7520, in the current-steering mode; Figure 1b shows how the DAC can be connected for voltage switching by reversing the roles of the MSB node (REF/AIN) and the active switch bus (OUT 1). Read full article



Steve Stephenson