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PRINCIPLES OF OPERATION
THEORY OF OPERATION
R
f
R
(g)
R
(g)
R
f
_
+
Differential Amplifier
V
OCM
_
+
_
+
V
CC+
V
IN-
V
IN+
V
O+
V
O-
THS414x
Fully differential Amplifier
V
CC-
Input voltage definition V
ID
+
ǒ
V
I)
Ǔ
–
ǒ
V
I–
Ǔ
V
IC
+
ǒ
V
I)
Ǔ
)
ǒ
V
I–
Ǔ
2
(6)
Output voltage definition V
OD
+
ǒ
V
O)
Ǔ
–
ǒ
V
O–
Ǔ
V
OC
+
ǒ
V
O)
Ǔ
)
ǒ
V
O–
Ǔ
2
(7)
Transfer function V
OD
+ V
ID
x A
ǒ
f
Ǔ
(8)
Output common mode voltage V
OC
+ V
OCM
(9)
V
OCM
_
+
_
+
V
CC+
V
IN-
V
IN+
V
O+
V
O-
Differential Structure Rejects
Coupled Noise at the Output
Differential Structure Rejects
Coupled Noise at the Input
Differential Structure Rejects
Coupled Noise at the Power Supply
V
CC-
THS4140
THS4141
SLOS320F – MAY 2000 – REVISED JANUARY 2006
The THS414x is a fully differential amplifier. Differential amplifiers are typically differential in/single out, whereas
fully differential amplifiers are differential in/differential out.
Figure 27. Differential Amplifier Versus a Fully Differential Amplifier
To understand the THS414x fully differential amplifiers, the definition for the pinouts of the amplifier are
provided.
Figure 28. Definition of the Fully Differential Amplifier
15
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