Datasheet

ADG508A/ADG509A
Rev. D | Page 13 of 16
SINGLE-SUPPLY OCTAL DAC APPLICATION
The entire system operates from a single 15 V power supply.
The ADG508A is ideally suited for the application because it
has both low charge injection and I
S
(OFF) leakage current.
The following circuit shows the ADG508A connected as a demulti-
plexer to provide eight separate, digitally programmable voltages
(0 V to 10 V) from the AD7245A. The AD7245A is a complete
12-bit, voltage output DAC with output amplifier and Zener
voltage reference on a monolithic CMOS chip.
DB11
DB0
R
FB
V
DD
V
OUT
R
OFS
AD7245A
V
SS
DGND
AGND
CS
WR
LDAC
CLR
REF OUT
ADG508A
EN
D
GND
V
SS
S8
S1
V
DD
A0 A1 A2
+
1/4 TLC274
V
OUT1
15V
15
V
15
V
0.01µF
1/4 TLC274
V
OUT8
15V
0.01µF
10µF0.1µF
10Ω
00051-024
Figure 23. ADG508A in a Single-Supply Octal DAC Circuit
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