cat515 Catalyst Semiconductor, cat515 Datasheet - Page 8

• Manufacturer Part Number: cat515
• Description: 8-bit Quad Digital Pot With Independent Reference Inputs
• Manufacturer: Catalyst Semiconductor

CONTROL
& DATA
CAT515
APPLICATION CIRCUITS (Cont.)
Doc. No. 25077-00 2/98 M-1
Coarse-Fine Offset Control by Averaging DAC Outputs
COARSE ADJUST
+5V
FINE ADJUST
V DD
GND
DAC
DAC
V REF
Digitally Trimmed Voltage Reference
for Single Power Supply Systems
V
V
REF
REF
V DD
GND
OPT 505
CAT515
H
L
127R C
V
R C
V
REF
REF
Fine adjust gives ± 1 LSB change in V
H
L
when V
V OFFSET
I > 2 mA
R = —————
C 256 1 µA
OFFSET
V REF
+
*
–
V+
= ———
+V
V REF
LT 1029
2
V
REF
OFFSET
= 5.000V
8
CONTROL
& DATA
Coarse-Fine Offset Control by Averaging DAC Outputs
COARSE ADJUST
+5V
FINE ADJUST
V DD
GND
DAC
DAC
Digitally Controlled Voltage Reference
+V REF
CAT515
for Dual Power Supply Systems
V
V DD
OPT 505
GND
V
REF
REF
-V REF
H
L
V
V
15K
REF
REF
H
L
1N5231B
127R C
10 µF
5.1V
R o
R C
1.00K
V OFFSET
+
–
LM 324
4.02 K
R = ———————————
R = ———————————
+
–
C
o
+V
-V
(+V
(-V
10K
REF
REF
28 - 32V
) + (V
) - (V
1 µA
1 µA
MPT3055EL
10 µF
35V
OFFSET
OFFSET
OUTPUT
+
+
0 - 25V
@ 1A
)
)