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CAT523_04 Datasheet, PDF (8/11 Pages) Catalyst Semiconductor – Configured Digitally Programmable Potentiometer | |||
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CAT523
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 =
âVRâEâF
2
127RC
COARSE ADJUST
DPP
+V
RC
V OFFSET +
â
GND
VREFL
+5V
+VREF
VDD
VREFH
FINE ADJUST
DPP
COARSE ADJUST
DPP
GND
VREFL
-VREF
127RC
RC
RC
=
(â+VâRâEFâ) â- (âVOâFFâSâETâ+â)
1 µA
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
V+
Coarse-Fine Offset Control by Averaging DPP Outputs
for Dual Power Supply Systems
28 - 32V
CONTROL
& DATA
I > 2 mA
VDD
VREFH
CAT523
GND
VREFL
VREF= 5.000V
LT 1029
CONTROL
& DATA
15K
10 µF
1N5231B
VDD
VREFH 5.1V
CAT523
+
GND
VREFL
â
1.00K
10K
LM 324
4.02 K
MPT3055EL
10 µF
35V
OUTPUT
0 - 25V
@ 1A
Digitally Trimmed Voltage Reference
Digitally Controlled Voltage Reference
Doc. No. 2005, Rev. E
8
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