CAT524_04 Datasheet, PDF (10/13 Pages) Catalyst Semiconductor – Configured Digitally Programmable Potentiometer

CAT524
APPLICATION CIRCUITS (Cont.)
+5V
2.2K
VDD
VREFH 4.7 uF
LM385-2.5
+15V
CONTROL
& DATA
DPP
CAT524
+5V
10K
+
–
10K
DPP
GND
VREFL
+
–
5M
5M
10K
ISINK = 2 - 255 mA
2N7000
39 Ω 1W
39 Ω 1W
2N7000
3.9K
1 mA steps
5 µA steps
10K
–
TIP 30
+
Current Sink with 4 Decades of Resolution
-15V
+15V
CONTROL
& DATA
51K
10K
+5V
VDD
VREFH
+
TIP 29
–
10K
DPP
CAT524
DPP
5M
5M
–
+
5M
5M
39 Ω 1W
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
Doc. No. 2006, Rev. E
10