Evaluation Board User Guide
UG-243
Signal Amplifier
RDAC2 can be operated as an inverting or noninverting signal
V IN
R41
1.7k ?
V OUT
amplifier supporting linear or pseudo logarithmic gains. Table 6
shows the available configurations.
W2
C1
10nF
OAVOUT
The noninverting amplifier with linear gain is shown in Figure 4,
and the gain is defined in Equation 3.
R4 3
A2
W2
A2 B2
RDAC2
B2
R 4 2
G ? 1 ? WB2
R
R38
where R WB2 is the resistor between the W2 and B2 terminals.
(3)
Figure 5. Pseudologarithmic Noninverting Amplifier
R43 and R42 can be used to set the maximum and minimum
gain limits.
V IN
R38
2.7k ?
W2
R41
1.7k ?
C1
10nF
V OUT
OAVOUT
The inverting amplifier with linear gain is shown in Figure 6,
and the gain is defined in Equation 5.
Note that the input signal, V IN , must be negative.
W2
B2
B2
R 4 2
G ? ?
R WB2
R38
(5)
RDAC2
Figure 4. Linear Noninverting Amplifier
where R WB2 is the resistor between the W2 and B2 terminals.
R41
1.7k ?
G ? 1 ? WB2
The noninverting amplifier with pseudologarithmic gain is
shown in Figure 5, and the gain is defined in Equation 4.
R
R AW2
(4)
V IN
R38
2.7k ?
W2
W2
B2
C1
10nF
B2
R4 2
V OUT
OAVOUT
where:
R WB2 is the resistor between the W2 and B2 terminals.
R AW2 is the resistor between the A2 and W2 terminals.
Table 6. Amplifier Selection Link Options
RDAC2
Figure 6. Linear Inverting Amplifier
Amplifier
Noninverting
Gain
Linear
Link
A27
Label
LINEAR
V IN Range
0 V to V DD
A29
A30
NON-INV
NON-INV
Pseudo logarithmic
A27
A29
A30
PSEUDOLOG
NON-INV
NON-INV
0 V to V DD
Inverting
Linear
A27
LINEAR
?V DD to 0 V
A29
A30
Rev. 0 | Page 5 of 16
INV
INV
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