AS1713
Data Sheet - Application Information
Differential Input / Output Buffer
Figure 25. Differential Input / Output Buffer
VDD
INN
SENSE
R2
R1
VIN
Differential
Input
AS1713
EN
–
+
OUT
REF
INP
R3
R4
VSS
VOUT
Differential
Output
VDD
R2
INN
EN
SENSE
R1
AS1713
–
+
OUT
REF
INP
R3
R4
VDD/2
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 (VSS + 1.2V), and the p-channel stage is active for common-mode input voltages typically less
than (VDD - 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
(VSS). Figure 26 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 (VDD = 2.7V) even with maximum load (32Ω to ground) as shown in Figure 27.
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