Datasheet
AD5790 Data Sheet
Rev. D | Page 24 of 28
Gain of Two Configuration (×2 Gain Mode)
Figure 52 shows an output amplifier configured for a gain of
two. The gain is set by the internal matched 6.8 kΩ resistors,
which are exactly twice the DAC resistance, having the effect of
removing an offset from the input bias current of the external
amplifier. In this configuration, the output spans from 2 ×
V
REFN
− V
REFP
to V
REFP
. This configuration is used to generate a
bipolar output span from a single ended reference input with
V
REFN
= 0 V. For this mode of operation, the RBUF bit of the
control register must be cleared to Logic 0.
A1
6.8kΩ 6.8kΩ
R1 R
FB
V
REFP
R
FB
INV
V
OUT
V
OUT
10pF
20-BIT
DAC
V
REFN
AD5790
AD8675
ADA4898-1
ADA4004-1
10239-054
Figure 52. Output Amplifier in Gain of Two Configuration










