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CAT523_07 Datasheet, PDF (9/15 Pages) Catalyst Semiconductor – Dual Digitally Programmable Potentiometer (DPP™) with 256 Taps and Microwire Interface
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CAT523
APPLICATION CIRCUITS
+5V
VI
CONTROL
& DATA
VDD
VREFH
CAT523
GND
VREFL
RI
RF
+15V
–
+
OP 07
-15V
VOUT
V OUT
=
VDPP
( RI+ RF )
RI
-
VI RF
For R I = RF
VOUT = 2VDPP - VI
DPP INPUT
MSB LSB
1111 1111
1000 0000
0111 1111
0000 0001
0000 0000
DPP OUTPUT
VDPP
=
CODE
255
VFS
-
VZERO
+ VZERO
VFS = 0.99VREF
VZERO = 0.01VREF
255
255
×
0.98VREF
+
0.01VREF
=
0.990VREF
128
255
×
0.98VREF
+
0.01VREF
=
0.502VREF
127
255
×
0.98VREF
+
0.01VREF
=
0.498VREF
1
255
×
0.98VREF
+
0.01VREF
=
0.014VREF
0
255
×
0.98VREF
+
0.01VREF
=
0.010VREF
ANALOG OUTPUT
VREF = 5V
RI = RF
VOUT = +4.90V
VOUT = +0.02V
VOUT = -0.02V
VOUT = -4.86V
VOUT = -4.90V
Bipolar DPP Output
V+
CONTROL
& DATA
+5V
RI
RF
I > 2mA
VDD
VREFH
CAT523
GND
VREFL
+15V
–
+
OP 07
-15V
VOUT
CONTROL
& DATA
VOUT = (1 + RRFI ) VDPP
VDD
VREFH
CAT523
GND
VREFL
VREF = 5.00V
LT 1029
Amplified DPP Output
Digitally Trimmed Voltage Reference
28 ÷ 32V
15kΩ 10µF
CONTROL
& DATA
1N5231B
10kΩ
VDD
VREFH 5.1V
CAT523
GND
VREFL
+
–
LM 324
4.02kΩ
1.00kΩ
MPT3055EL
10µF
35V
OUTPUT
0 - 25V
@ 1A
Digitally Controlled Voltage Reference
© Catalyst Semiconductor, Inc.
9
Characteristics subject to change without notice
Doc. No. MD-2005 Rev. G
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