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VCA824IDG4 Datasheet(PDF) 26 Page - Texas Instruments

Part No. VCA824IDG4
Description  Ultra-Wideband, > 40-dB Gain Adjust Range, Linear in V/V Variable Gain Amplifier
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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VCA824IDG4 Datasheet(HTML) 26 Page - Texas Instruments

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background image
V
OUT
V
IN
R
2
R
1
1
1+s
R C
2
G
= -
´
R
2
453W
+V
IN
R
G+
R
G-
-VIN
R
9
432W
C
9
10 F
m
R
8
50W
R
5
50W
R
1
20W
R
10
75W
VCA824
R
21
3kW
C
5
4pF
R
17
6kW
C
6
320 F
m
R
18
13.6kW
C
7
300 F
m
V
G
DC
=+1V
75
Load
W
V
G
GND
V
REF
FB
V
OUT
V
IN
V
OUT
2.0
1.5
1.0
0.5
0
-0.5
-1.0
Frequency(MHz)
1
10
100
CableAttenuation
VCA824Equalization
VCA824
SBOS394D – NOVEMBER 2007 – REVISED JANUARY 2016
www.ti.com
Figure 72. Cable Attenuation vs Equalizer Gain
Note that this implementation shows the cable attenuation side-by-side with the equalization in the same plot. For
a given frequency, the equalization function realized with the VCA824 matches the cable attenuation. The circuit
in Figure 73 is a driver circuit. To implement a receiver circuit, the signal is received differentially between the
+VIN and –VIN inputs.
Figure 73. Differential Cable Equalizer
9.1.4 Voltage-Controlled Lowpass Filter [application sub]
In the circuit of Figure 74, the VCA824 serves as the variable-gain element of a voltage-controlled low-pass filter.
This section discusses how this implementation expands the circuit voltage swing capability over that normally
achieved with the equivalent multiplier implementation. The circuit control voltage, VG, is calculated as according
to the simplified relationship described in Equation 6.
(6)
26
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Product Folder Links: VCA824


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