Standard Gain Configuration
3.1 Standard Gain Configuration
The THS6182DWEVM default configuration is a fully differential input, fully
differential output gain of about 2.2 (at the output connectors using an
instrument with 50- ? load on each input). A simplified schematic is shown in
Figure 3?1. This gain is calculated according to an equation that is similar to
the one that describes an instrumentation amplifier:
Differential gain + O
I
V   (diff)
V (diff)
+ 1 ) 2
R2
R23
(1)
where
R2 = R11
Series resistors R6, R7, R15 and R16 affect output voltage at J1 and J3. The
designer needs to take the voltage divider law into account for their load
impedance and R6, R7, R15 and R16. When a designer monitors the output
at TP1 and TP3 using a high-impedance differential probe, the default gain is
5 V.
Figure 3?1. Default Configuration Operation
+V
TP1
TP2
J2
IN2
Z1
0 W
R9
0 W
R10
49.9 W
8
1
18
+
?
U1A
THS6182
2
3
R6
12.4 W
R2
1.5 k W
R7
49.9 W
J1
OUT1
?V
C2
0.1 m F
R23
750 W
R11
TP4
J4
IN2
Z2
0 W
R18
0 W
20
13
U1B
THS6182
?
+
19
TP3
1.5 k W
R15
12.4 W
R16
49.9 W
J3
OUT2
R19
49.9 W
3-2
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