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CAT522 Datasheet, PDF (10/15 Pages) Catalyst Semiconductor – 8-Bit Dual Digital POT With Independent Reference Inputs | |||
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CAT522
Not Recommended for New Design
+5V
VDD
VREF
VREFH
FINE ADJUST
DPP
127RC
CAT522
COARSE ADJUST
DPP
GND
VREFL
RC
VOFFSET
+V
+
â
VREF
RC = 256 x 1µA
Fine adjust gives ±1 LSB change in VOFFSET
when VOFFSET = VREF/2
Coarse-Fine Offset Control by Averaging DPP
Outputs for Single Power Supply Systems
+5V
2.2kâ¦
VDD
4.7µF
VREFH
CONTROL
& DATA
DPP1
CAT522
+5V
10kâ¦
+5V
VDD
+VREF
VREFH
FINE ADJUST
DPP
127RC
CAT522
COARSE ADJUST
RC
DPP
GND
VREFL
R0
-VREF
RC =
(+VREF) - (VOFFSET+)
1µA
(-VREF) + (VOFFSET+)
R0 =
1µA
VOFFSET
+V
+
â
-V
Coarse-Fine Offset Control by Averaging DPP
Outputs for Dual Power Supply Systems
LM385-2.5
+15V
+
â
10kâ¦
ISINK = 2 - 255mA
2N7000
39⦠1W
39⦠1W
1mA steps
DPP2
GND
VREFL
5Mâ¦
+
â
5Mâ¦
2N7000
3.9kâ¦
5µA steps
10kâ¦
10kâ¦
â
+
TIP30
Doc. No. MD-2004 Rev. I
-15V
Current Sink with 4 Decades of Resolution
10
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
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