Datasheet

AD9838
Rev. A | Page 8 of 32
Pin No. Mnemonic Description
18 FSADJUST
Full-Scale Adjust Control. A resistor (R
SET
) is connected between this pin and AGND to determine the magnitude
of the full-scale DAC current. The relationship between R
SET
and the full-scale current is as follows:
IOUT
FULL SCALE
= 18 × FSADJUST/R
SET
FSADJUST = 1.14 V nominal, R
SET
= 6.8 kΩ typical
19 REFOUT Voltage Reference Output. The AD9838 has an internal 1.20 V reference that is available at this pin.
20 COMP DAC Bias Pin. This pin is used for decoupling the DAC bias voltage.
EP Exposed Pad. Connect the exposed pad to ground.