Datasheet

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V
out
 V
REF

R2
R1
 1

Din
4096
 V
tail
R2
R1
(1)
DAC7553
SLAS477 – SEPTEMBER 2005
errors are not an issue for loop accuracy because
offset and gain errors could be tolerated. One
DAC7553 channel can provide the Vtail voltage, while
Fixed R1 and R2 resistors can be used to coarsely
the other DAC7553 channel can provide Vdac voltage
set the gain required in the first term of the equation.
to help generate the high-voltage outputs.
Once R2 and R1 set the gain to include some
For ±5-V operation: R1=10 k Ω, R2 = 15 k Ω, V
tail
=
minimal over-range, a DAC7553 channel could be
3.33 V, V
REF
= 4.096 V
used to set the required offset voltage. Residual
For ±10-V operation: R1=10 k Ω, R2 = 39 k Ω, V
tail
=
2.56 V, V
REF
= 4.096 V
For ±12-V operation: R1=10 k Ω, R2 = 49 k Ω, V
tail
=
2.45 V, V
REF
= 4.096 V
18