Datasheet

Evaluation Board User Guide UG-470
Rev. 0 | Page 7 of 20
R43 and R42 can be used to set the maximum and minimum
gain limits.
The inverting amplifier with pseudologarithmic gain is shown
in Figure 7 and the gain is defined in Equation 6.
2256
2
RDAC
RDAC
G
−
−=
(6)
where:
RDAC2 is the code loaded in the RDAC2.
VOUT2
V
IN
RDAC2
R42
C1
10nF
W2
B2
W2
A2
B2
R41
1.7kΩ
R43
A2
11007-007
NOTES
1. R43 AND R42 CAN BE USED TO SET THE
MAXIMUM AND MINIMUM GAIN LIMITS.
Figure 7. Pseudologarithmic Inverting Amplifier
Output Buffers
RDAC3 and RDAC4 can be connected to an output buffer as
shown Figure 8 and Figure 9.
11007-008
VOUT3
RDAC3
B3
BUF-3
B3
W3
W3
Figure 8. RDAC3
11007-009
VOUT4
RDAC4
B4
BUF-4
B4
W4
W4
Figure 9. RDAC4