Datasheet

Single-Ended Input
1.25
0.0 0.75 1.75 2.5
3.75
V
A
= 5.0V
V
REF
(V)
COMMON-MODE VOLTAGE (V)
2.5
0
5
-1
6
1.25
SM73201
www.ti.com SNOSB89B –JUNE 2011–REVISED JUNE 2013
Figure 32. V
CM
range for single-ended operation
Table 1. Allowable V
CM
Range
Input Signal Minimum V
CM
Maximum V
CM
Differential V
REF
/ 2 V
A
− V
REF
/ 2
Single-Ended V
REF
V
A
− V
REF
CMRR
By using this differential input, small signals common to both inputs are rejected. As shown in Figure 33, noise is
immune at low frequencies where the common-mode rejection ratio (CMRR) is 90 dB. As the frequency
increases to 1 MHz, the CMRR rolls off to 40 dB . In general, operation with a fully differential input signal or
voltage will provide better performance than with a single-ended input. However, if desired, the SM73201 can be
presented with a single-ended input.
Figure 33. Analog Input CMRR vs. Frequency
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