Datasheet

Evaluation Board User Guide UG-397
Rev. 0 | Page 5 of 16
Signal Amplifier
RDAC can be operated as a noninverting signal amplifier
supporting pseudo logarithmic gain. Table 6 shows the available
configurations.
The noninverting amplifier with pseudologarithmic gain is
shown in Table 6, and the gain is defined in Equation 4.
WB
AW
R
R
G 1 (4)
where:
R
AW
is the resistor between the W and A terminals.
R
WB
is the resistor between the W and B terminals.
VOUT2
V
IN
RDAC
A
B
W
+
–
W2
A2 B2
C1
10nF
R41
1.7kΩ
R42
10625-004
Figure 4. Pseudologarithmic Noninverting Amplifier
R42 can be used to set the maximum and minimum gain limits.
Table 6. Amplifier Selection Link Options
Amplifier Gain Link(DB
1
) Link (MB
2
) Label V
IN
Range
Noninverting Pseudo logarithmic A2 = A3 = A4-A A7 LOC 0 V to V
DD
A6 N-INV
A1 not inserted A8 N-INV
1
Daughter board
2
Motherboard