Datasheet

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V
out
 V
ref

R2
R1
 1

Din
4096
 V
tail
R2
R1
(1)
DAC7554
REFIN
DAC7554
_
+
V
dac
R2
R1
REF3140
V
ref
V
tail
V
OUT
OPA4130
DAC7554
SLAS399A – OCTOBER 2004 – REVISED NOVEMBER 2004
Fixed R1 and R2 resistors can be used to coarsely
set the gain required in the first term of the equation.
Once R2 and R1 set the gain to include some
minimal over-range, a DAC7554 channel could be
used to set the required offset voltages. Residual
errors are not an issue for loop accuracy because
offset and gain errors could be tolerated. One
DAC7554 channel can provide the Vtail voltage, while
the other three DAC7554 channels can provide Vdac
Figure 35. Low-cost, Wide-swing Voltage Gener-
voltages to help generate three high-voltage outputs.
ator for Control Loop Applications
For ± 5-V operation: R1=10 k Ω, R2 = 15 k Ω, Vtail =
3.33 V, Vref = 4.096 V
The output voltage of the configuration is given by:
For ± 10-V operation: R1=10 k Ω, R2 = 39 k Ω, Vtail =
2.56 V, Vref = 4.096 V
For ± 12-V operation: R1=10 k Ω, R2 = 49 k Ω, Vtail =
2.45 V, Vref = 4.096 V
18