VCA824_16 Datasheet, PDF (1/41 Pages) Texas Instruments – Ultra-Wideband, > 40-dB Gain Adjust Range, Linear in V/V Variable Gain Amplifier

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VCA824
SBOS394D – NOVEMBER 2007 – REVISED JANUARY 2016
VCA824 Ultra-Wideband, > 40-dB Gain Adjust Range, Linear in V/V Variable Gain Amplifier
1 Features
•1 710-MHz Small-Signal Bandwidth (G = 2 V/V)
• 320 MHz, 4-V_PP Bandwidth (G = 10 V/V)
• 0.1-dB Gain Flatness to 135 MHz
• 2500-V/μs Slew Rate
• > 40-dB Gain Adjust Range
• High Gain Accuracy: 20-dB ±0.3-dB
• High Output Current: ±90 mA
2 Applications
• Differential Line Receivers
• Differential Equalizers
• Pulse Amplitude Compensation
• Variable Attenuators
• Voltage-tunable Active Filters
3 Description
The VCA824 is a DC-coupled, wideband, linear-in
V/V, continuously variable, voltage-controlled gain
amplifier. The device provides a differential input to
single-ended conversion with a high-impedance gain
control input used to vary the gain down 40 dB from
the nominal maximum gain set by the gain resistor
(R_G) and feedback resistor (R_F).
SPACE
Differential Equalizer
V_IN1
V_IN2
+V_IN
R_F
R_S
R_G+
R₁
R_G
FB
VCA824
C₁
R_G-
-V_IN
20W
R_S
The VCA824 internal architecture consists of two
input buffers and an output current feedback amplifier
stage integrated with a multiplier core to provide a
complete variable gain amplifier (VGA) system that
does not require external buffering. The maximum
gain is set externally with two resistors, providing
flexibility in designs. The maximum gain is intended
to be set between 2 V/V and 40 V/V. Operating from
±5-V supplies, the gain control voltage for the
VCA824 adjusts the gain linearly in V/V as the control
voltage varies from 1 V to –1 V. For example, set for
a maximum gain of 10 V/V, the VCA824 provides 10
V/V, at 1-V input, to 0.1 V/V at –1-V input of gain
control range. The VCA824 offers excellent gain
linearity. For a 20-dB maximum gain, and a gain-
control input voltage varying between 0 V and 1 V,
the gain does not deviate by more than ±0.3-dB
(maximum at 25°C).
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
VCA824
SOIC (14)
VSSOP (10)
8.65 mm × 3.91 mm
3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Differential Equalization of an RC Load
9
Equalized Frequency Response
6
3
0
Initial Frequency Response
-3 _{of the VCA824 with RC Load}
-6
-9
-12
-15
-18
-21
-24
1M
10M
100M
1G
Frequency (Hz)
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.