DAC900-Q1 Datasheet, PDF (18/26 Pages) Texas Instruments – 10-BIT 165-MSPS DIGITAL-TO-ANALOG CONVERTER

DAC900-Q1
SBAS505 – JUNE 2010
www.ti.com
Single-Ended Configuration
Using a single load resistor connected to the one of the DAC outputs, a simple current-to-voltage conversion can
be accomplished. The circuit in Figure 6 shows a 50Ω resistor connected to IOUT, providing the termination of
the further connected 50Ω cable. Therefore, with a nominal output current of 20mA, the DAC produces a total
signal swing of 0V to 0.5V into the 25Ω load.
I_OUTFS = 20mA
I_OUT
DAC900
I_OUT
50Ω
25Ω
V_OUT = 0V to +0.5V
50Ω
Figure 6. Driving a Doubly-Terminated 50Ω Cable Directly
Different load resistor values may be selected as long as the output compliance range is not exceeded.
Additionally, the output current, IOUTFS, and the load resistor may be mutually adjusted to provide the desired
output signal swing and performance.
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