Datasheet

TLC7225C, TLC7225I
QUADRUPLE 8-BIT DIGITAL-TO-ANALOG CONVERTERS
SLAS109B – OCTOBER 1996 – REVISED FEBRUARY 2001
13
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
AGND bias for direct bipolar-output operation
The TLC7225 can be used in bipolar operation without adding additional external operational amplifiers by
biasing AGND to V
SS
as shown in Figure 9. This configuration provides an excellent method for providing a
direct bipolar output with no additional components. The transfer values are shown in Table 4.
_
+
DAC A
AGND
DGND
TLC7225
†
REFA (V
ref
= 5 V)
OUTA
5 22
2
73
V
DD
= 10 to 15 V
6
V
SS
†
Digital inputs omitted for clarity.
–5 V
Output range
(5 V to –5 V)
Figure 9. AGND Bias for Direct Bipolar-Output Operation
LSBMSB
DAC LATCH CONTENTS
ANALOG OUTPUT
V
ref
127
128
1111 1111
V
ref
1
128
1000 0001
1000 0000
–V
ref
128
128
V
ref
0111 1111
0000 0001
V
ref
127
128
0000 0000
0 V
Table 4. Bipolar (Offset Binary) Code
V
ref
1
128