Datasheet

Differential Input
1.25
0.0 1.0 2.0 3.0 4.0 5.0
3.75
V
A
= 5.0V
V
REF
(V)
COMMON-MODE VOLTAGE (V)
2.5
0
5
-1
6
2.5
+
-
SM73201
C
S
SRC
VREF
R
S
V
CM
V
CM
V
CM
+ V
REF
V
CM
- V
REF
SM73201
SNOSB89B –JUNE 2011–REVISED JUNE 2013 www.ti.com
Figure 30. Single-Ended Input
Since the design of the SM73201 is optimized for a differential input, the performance degrades slightly when
driven with a single-ended input. Linearity characteristics such as INL and DNL typically degrade by 0.1 LSB and
dynamic characteristics such as SINAD typically degrade by 2 dB. Note that single-ended operation should only
be used if the performance degradation (compared with differential operation) is acceptable.
Input Common Mode Voltage
The allowable input common mode voltage (V
CM
) range depends upon V
A
and V
REF
used for the SM73201. The
ranges of V
CM
are depicted in Figure 31 and Figure 32. Note that these figures only apply to a V
A
of 5V.
Equations for calculating the minimum and maximum V
CM
for differential and single-ended operations are shown
in Table 1.
Figure 31. V
CM
range for Differential Input operation
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