CAT525 Datasheet, PDF (10/12 Pages) Catalyst Semiconductor – Configured Digitally Programmable Potentiometer (DPP™): Programmable Voltage Applications

CAT525
APPLICATION CIRCUITS (Cont.)
+5V
2.2K
VDD
VREF
4.7 µA
LM385-2.5
+15V
CONTROL
& DATA
DPP1
CAT525
+5V
10K
+
–
10K
DPP2
GND
VREFL
+
–
5M
5M
ISINK = 2 - 255 mA
2N7000
39 Ω 1W
39 Ω 1W
2N7000
3.9K
1 mA steps
5 µA steps
10K
10K
–
TIP 30
+
CONTROL
& DATA
Doc. No. 25078-00 4/01 - A M-1
-15V
Current Sink with 4 Decades of Resolution
+15V
51K
10K
+5V
VDD
VREFH
+
TIP 29
–
10K
DPP1
O^CP^AT^T55²0⁵5
DPP2
5M
5M
–
+
5M
5M
39 Ω1W
39 Ω 1W
BS170P
3.9K
1 mA steps
GND
VREFL
–
+
LM385-2.5
BS170P
5 µA steps
-15V
ISOURCE = 2 - 255 mA
Current Source with 4 Decades of Resolution
10