Datasheet

25
1
100 10k 1M
FREQUENCY (Hz)
-20
-5
10
GAIN (dB)
100k1k
10
20
15
5
0
-10
-15
C
F
= 10 pF
C
F
= 100 pF
C
F
= 1 nF
C
C2
R
B1
R
B2
C
F
C
C1
V
+
A
V
= 1 +
R
2
R
1
+
-
V
IN
+
-
R
1
1 k:
R
2
10 k:
V
OUT
+
-
= 11
C
C1
+
V
OUT
+
-
-
C
F
V
IN
+
-
R
B1
V
+
R
B2
C
C2
R
2
R
1
A
V
=
-
= -10
R
2
10 k:
R
1
1 k:
LMV796, LMV797
SNOSAU9D –MARCH 2006–REVISED MARCH 2013 www.ti.com
Figure 49. Inverting Audio Preamplifier
Figure 50. Non-inverting Audio Preamplifier
Figure 51. Frequency Response of the Inverting Audio Preamplifier
TRANSIMPEDANCE AMPLIFIER
CMOS input op amps are often used in transimpedance applications as they have an extremely high input
impedance. A transimpedance amplifier converts a small input current into a voltage. This current is usually
generated by a photodiode. The transimpedance gain, measured as the ratio of the output voltage to the input
current, is expected to be large and wide-band. Since the circuit deals with currents in the range of a few nA, low
noise performance is essential. The LMV796/LMV797 are CMOS input op amps providing wide bandwidth and
low noise performance, and are hence ideal for transimpedance applications.
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