Datasheet

DAC7552
V
REF
H
DAC7552
_
+
V
dac
R2
R1
REF3140
V
REF
V
tail
V
OUT
OPA130
V
out
+ V
REF
ǒ
R2
R1
) 1
Ǔ
Din
4096
* V
tail
R2
R1
DAC7552
www.ti.com SLAS442D –JANUARY 2005– REVISED JUNE 2011
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 DAC7552 channel could be
used to set the required offset voltage. Residual
errors are not an issue for loop accuracy because
offset and gain errors could be tolerated. One
DAC7552 channel can provide the Vtail voltage, while
the other DAC7552 channel can provide Vdac voltage
to help generate the high-voltage outputs.
For ±5-V operation: R1=10 kΩ, R2 = 15 kΩ, V
tail
=
Figure 31. Low-cost, Wide-swing Voltage
3.33 V, V
REF
= 4.096 V
Generator for Control Loop Applications
For ±10-V operation: R1=10 kΩ, R2 = 39 kΩ, V
tail
=
2.56 V, V
REF
= 4.096 V
The output voltage of the configuration is given by:
For ±12-V operation: R1=10 kΩ, R2 = 49 kΩ, V
tail
=
2.45 V, V
REF
= 4.096 V
(1)
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