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CAT525 Datasheet, PDF (8/12 Pages) Catalyst Semiconductor – Configured Digitally Programmable Potentiometer (DPP™): Programmable Voltage Applications | |||
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CAT525
APPLICATION CIRCUITS (Cont.)
+5V
VREF
VDD
VREFH
FINE ADJUST
DPP
RC
=
ââVRâEâF â
256 * 1 µA
Fine adjust gives ± 1 LSB change in V OFFSET
when VOFFSET = âVRâ2EâF
127RC
COARSE ADJUST
DPP
+V
RC
V OFFSET +
â
GND
VREFL
+5V
+VREF
VDD
VREFH
FINE ADJUST
DPP
COARSE ADJUST
DPP
GND
VREFL
-V REF
127RC
RC
RC = (â+VâRâEFâ)1â- µ(âVAOâFFâSâETâ+â)
Ro
=
(â-VâREâFâ) +â(âVOâFFâSâETâ+â)
1 µA
+V
Ro
VOFFSET +
â
-V
Coarse-Fine Offset Control by Averaging DPP Outputs
for Single Power Supply Systems
Coarse-Fine Offset Control by Averaging DPP Outputs
for Dual Power Supply Systems
CONTROL
& DATA
V+
I > 2 mA
VDD
VREFH
OCAPT552055
GND
VREFL
VREF= 5.000V
LT 1029
Digitally Trimmed Voltage Reference
28 - 32V
CONTROL
& DATA
15K
10 µF
1N5231B
VDD
VREFH 5.1V
COAPTT550255
+
GND
VREFL
â
1.00K
10K
LM 324
4.02 K
MPT3055EL
10 µF
35V
OUTPUT
0 - 25V
@ 1A
Digitally Controlled Voltage Reference
Doc. No. 25078-00 4/01 - A M-1
8
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