Datasheet

C
1
+
-
R
2
R
1
C
2
R
G
R
F
R
B
R
F
C
R
R
S
V
O
V
IN
-
+
50:
50:
R
G
R
F
= R
B
R
G
= R
S
||R
V
O
#V
IN
K
O
sR
S
C
;
K
O
= 1 +
R
F
R
G
LMH6624
www.ti.com SNOSA42F –NOVEMBER 2002–REVISED MARCH 2013
(7)
LOW NOISE INTEGRATOR
The LMH6624/LMH6626 implement a deBoo integrator shown in Figure 58. Positive feedback maintains
integration linearity. The LMH6624/LMH6626’s low input offset voltage and matched inputs allow bias current
cancellation and provide for very precise integration. Keeping R
G
and R
S
low helps maintain dynamic stability.
Figure 58. Low Noise Integrator
HIGH-GAIN SALLEN-KEY ACTIVE FILTERS
The LMH6624/LMH6626 are well suited for high gain Sallen-Key type of active filters. Figure 59 shows the 2
nd
order Sallen-Key low pass filter topology. Using component predistortion methods discussed in OA-21
(SNOA369) enables the proper selection of components for these high-frequency filters.
Figure 59. Sallen-Key Active Filter Topology
LOW NOISE MAGNETIC MEDIA EQUALIZER
The LMH6624/LMH6626 implement a high-performance low noise equalizer for such application as magnetic
tape channels as shown in Figure 60. The circuit combines an integrator with a bandpass filter to produce the
low noise equalization. The circuit’s simulated frequency response is illustrated in Figure 61.
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