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Evaluation Board User Guide
UG-274
In addition, R36 can be used to achieve a pseudologarithmic
attenuation. To do so, adjust the R36 resistor until a desirable
transfer function is found.
Signal Amplifier
V IN
R41
1.7k ?
W2
C1
10nF
V OUT
OAVOUT
A3
B3
RDAC3 can be operated as an inverting or noninverting signal
shows the available configurations.
A2 W3 B2
R43 R42
RDAC3
Figure 5. Pseudologarithmic Noninverting Amplifier
Table 6. Amplifier Selection Link Options
Amplifier Gain Link
Noninverting Linear A27
A29
A30
Label
LINEAR
NON-INVERTING
NON-INVERTING
R43 and R42 can be used to set the maximum and minimum
gain limits.
and the gain is defined in Equation 5.
R WB 3
Inverting
Pseudologarithmic
Linear
A27
A29
A30
A27
PSEUDOLOG
NON-INVERTING
NON-INVERTING
LINEAR
G = ?
R38
where R WB3 is the resistor between the W3 and B3 terminals.
(5)
Pseudologarithmic
A29
A30
A27
A29
A30
INVERTING
INVERTING
PSEUDOLOG
INVERTING
INVERTING
V IN
R38
2.7k ?
W2
W3
R41
1.7k ?
B3
C1
10nF
B2
R42
V OUT
OAVOUT
and the gain is defined in Equation 3.
RDAC3
Figure 6. Linear Inverting Amplifier
R WB3
V OUT
W2
B3
R WB3
G = 1 +
R38
where R WB3 is the resistor between the W3 and B3 terminals.
R41
1.7k ?
V IN
R38
2.7k ?
C1 OAVOUT
10nF
W3 B2
R42
RDAC3
(3)
The inverting amplifier with pseudologarithmic gain is shown
in Figure 7, and the gain is defined in Equation 6.
G = ? (6)
R AW3
where:
R WB3 is the resistor between the W3 and B3 terminals.
R AW3 is the resistor between the A3 and W3 terminals.
R41
1.7k ?
Figure 4. Linear Noninverting Amplifier
The noninverting amplifier with pseudologarithmic gain is
W2
C1
10nF
V OUT
OAVOUT
G = 1 + WB3
A3
B3
shown in Figure 5, and the gain is defined in Equation 4.
R
R AW3
where:
R WB3 is the resistor between the W3 and B3 terminals.
R AW3 is the resistor between the A3 and W3 terminals.
(4)
A2 W3 B2
R43 R42
V IN
RDAC3
Figure 7. Pseudologarithmic Inverting Amplifier
R43 and R42 can be used to set the maximum and minimum
gain limits.
Rev. 0 | Page 5 of 16
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