Texas Instruments THS4012 - Manual (Page 10)

THS4012 EVM Noninverting Operation
1-4 General
1.3 THS4012 EVM Noninverting Operation
The THS4012 EVM is shipped preconfigured for dual-channel noninverting
operation, as shown in Figure 1–2. Note that compensation capacitors C3 and
C6 are not installed.
Figure 1–2. THS4012 EVM Schematic — Noninverting Operation
C1
6.8 µ F
–VCC
1
GND
2
+VCC
3
J2
C2
6.8
µ
F
–VCC
+VCC
–
+
U1:A
THS4012
1
4
8 2
3
R3
0 Ω
R5
1 k
Ω
R6
1 k
Ω
+VCC
C3
x
µ
F
R7
49.9 Ω
Vout1
J3
C4
0.1
µ
F
–VCC
J1
Vin1
R1
49.9 Ω
–
+
U1:B
THS4012
7
6
5
R11
0 Ω
R13
1 k
Ω
R14
1 k
Ω
C6
x
µ
F
R15
49.9
Ω
Vout2
J5
J4
Vin2
R9
49.9 Ω
C5
0.1 µ F
The gain of the EVM can easily be changed to support a particular application
by simply changing the ratio of resistors R6 and R5 (channel 1) and R14 and
R13 (channel 2) as described in the following equation:
Noninverting Gain +
1
)
R
F
R
G
+
1
)
R6
R5
and 1
)
R14
R13
In addition, some applications, such as those for video, may require the use
of 75-
Ω
cable and 75-
Ω
EVM input termination and output isolation resistors.