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VCA824IDG4 Datasheet(PDF) 28 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) 28 Page - Texas Instruments

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V
=
OUT
´ V
V
IN
´
G
R
F
R
G
V
=
OUT
´ V
V
+
G
´
IN
R
F
R
G
R
F
R
G
-
R
F
R
1
´ VIN
0.1 F
m
X2Y
Capacitor
(seedetail)
â
+V
S
-V
S
G
1
G
2
A
B
X2Y CapacitorDetail
®
SO-14
VCA824
x1
x2
R
200
G
W
R
G+
V
IN
x1
R
G-
-V
IN
I
RG
V
G
V
OUT
FB
R
F
1kW
V
REF
+5V
-5V
2.2 F
m
2.2 F
m
+
+
20W
20W
20W
V
OUT
+V
IN
VCA824
SBOS394D – NOVEMBER 2007 – REVISED JANUARY 2016
www.ti.com
Figure 75 shows the dc-coupled, gain of 10 V/V, dual power-supply circuit used as the basis of Electrical
Characteristics- Vs = ± 5 V Electrical Characteristics: VS = ±5 V and Typical Characteristics. For test purposes,
the input impedance is set to 50-
Ω with a resistor to ground and the output impedance is set to 50-Ω with a
series output resistor. Voltage swings reported in Electrical Characteristics- VS = ± 5 V are taken directly at the
input and output pins, while output power (dBm) is at the matched 50-
Ω load. For the circuit in Figure 75, the
total effective load is 100-
Ω ∥ 1-kΩ. Note that for the 14-pin, SOIC package, there is a voltage reference pin,
VREF (pin 9). For the 14-pin SOIC package, this pin must be connected to ground through a 20-Ω resistor to
avoid possible oscillations of the output stage. In the 10-pin, MSOP package, this pin is internally connected and
does not require such precaution. An X2Y® capacitor has been used for power-supply bypassing. The
combination of low inductance, high resonance frequency, and integration of three capacitors in one package
(two capacitors to ground and one across the supplies) enables the VCA824 to achieve the low second-harmonic
distortion reported in Electrical Characteristics- VS = ± 5 V.
Figure 75. DC-Coupled, AVMAX = 10 V/V, Bipolar Supply Specification and Test Circuit
9.2 Typical Application
A four-quadrant multiplier can easily be implemented using the VCA824. By placing a resistor between FB and
VIN, the transfer function depends upon both VIN and VG, as shown in Equation 10.
(10)
Setting R1 to equal RG, the term that depends only on VIN drops out of the equation, leaving only the term that
depends on both VG and VIN. VOUT then follows Equation 11.
(11)
28
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Product Folder Links: VCA824


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