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VCA824IDG4 Datasheet(PDF) 22 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) 22 Page - Texas Instruments

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65
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Frequency(Hz)
10k
100k
1M
10M
100M
InputReferred
R
F
+V
IN
R
G+
R
G-
-VIN
FB
R
G
R
S
R
S
20W
V
IN+
V
IN-
VCA824
VCA824
SBOS394D – NOVEMBER 2007 – REVISED JANUARY 2016
www.ti.com
9 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
9.1.1 Difference Amplifier
Because both inputs of the VCA824 are high-impedance, a difference amplifier can be implemented without any
major problem. Figure 65 shows this implementation. This circuit provides excellent common-mode rejection ratio
(CMRR) as long as the input is within the CMRR range of –2.1 V to 1.6 V. Note that this circuit does not make
use of the gain control pin, VG. Also, it is recommended to choose RS such that the pole formed by RS and the
parasitic input capacitance does not limit the bandwidth of the circuit. Figure 66 shows the common-mode
rejection ratio for this circuit implemented in a gain of 10 V/V for VG = 1 V. Note that because the gain control
voltage is fixed and is normally set to 1V, the feedback element can be reduced in order to increase the
bandwidth. When reducing the feedback element, make sure that the VCA824 is not limited by common-mode
input voltage, the current flowing through RG, or any other limitation described in this data sheet.
Figure 65. Difference Amplifier
Figure 66. Common-Mode Rejection Ratio
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Product Folder Links: VCA824


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