ADG508A/ADG509A
SINGLE-SUPPLY OCTAL DAC APPLICATION
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.
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 IS (OFF) leakage current.
15V
15V
15V
EN
V
DD
V
DD
DB11
DB0
R
FB
V
OUT1
S1
V
D
OUT
1/4 TLC274
0.01µF
AD7245A
ADG508A
CS
R
OFS
WR
V
GND
SS
15V
LDAC
CLR
V
DGND
AGND
SS
V
OUT8
S8
REF OUT
1/4 TLC274
0.01µF
A0 A1 A2
10Ω
+
0.1µF
10µF
Figure 23. ADG508A in a Single-Supply Octal DAC Circuit
Rev. D | Page 13 of 16
ADI [ ADI ]
