AS1713
Data Sheet - A p p l i c a t i o n I n f o r m a t i o n
Differential Input / Output Buffer
Figure 25. Differential Input / Output Buffer
VDD
INN
V
IN
Differential
Input
EN
INP
R
1
AS1713
R
2
SENSE
–
+
R
4
OUT
REF
R
3
VSS
VDD
INN
EN
INP
R
1
AS1713
R
2
SENSE
V
OUT
Differential
Output
–
+
R
4
OUT
REF
VDD/2
R
3
VSS
Rail-to-Rail Input Stage
The AS1713 CMOS op amps have parallel connected n- and p-channel differential input stages that combine to accept
a common-mode range extending to both supply rails. The n-channel stage is active for common-mode input voltages
typically greater than (V
SS
+ 1.2V), and the p-channel stage is active for common-mode input voltages typically less
than (V
DD
- 1.2V).
Rail-to-Rail Output Stage
The minimum output is within millivolts of ground for single- supply operation, where the load is referenced to ground
(V
SS
).
shows the input voltage range and the output voltage swing of an AS1713 connected as a voltage fol-
lower. The maximum output voltage swing is load dependent although it is guaranteed to be within 500mV of the posi-
tive rail (V
DD
= 2.7V) even with maximum load (32
Ω
to ground) as shown in
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