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VCA610 の電気的特性と機能

VCA610のメーカーはBurr-Brown Corporationです、この部品の機能は「WIDEBAND VOLTAGE CONTROLLED AMPLIFIER」です。


製品の詳細 ( Datasheet PDF )

部品番号 VCA610
部品説明 WIDEBAND VOLTAGE CONTROLLED AMPLIFIER
メーカ Burr-Brown Corporation
ロゴ Burr-Brown Corporation ロゴ 




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VCA610 Datasheet, VCA610 PDF,ピン配置, 機能
® VCA610
VCA610
VCA610
WIDEBAND
VOLTAGE CONTROLLED AMPLIFIER
FEATURES
q WIDE GAIN CONTROL RANGE: 80dB
q SMALL PACKAGE: 8-pin SOIC or DIP
q WIDE BANDWIDTH: 30MHz
q LOW VOLTAGE NOISE: 2.2nV/Hz
q FAST GAIN SLEW RATE: 300dB/µs
q EASY TO USE
DESCRIPTION
The VCA610 is a wideband, continuously variable,
voltage controlled gain amplifier. It provides linear-
dB gain control with high impedance inputs. It is
designed to be used as a flexible gain control element
in a variety of electronic systems.
The VCA610 has a gain control range of 80dB (–40dB
to +40dB) providing both gain and attenuation for
maximum flexibility in a small 8-lead SO-8 or plastic
dual-in-line package. The broad attenuation range can
be used for gradual or controlled channel turn-on and
turn-off for applications in which abrupt gain changes
can create artifacts or other errors. In addition, the
output can be disabled to provide –80dB of attenua-
tion. Group delay variation with gain is typically less
than ±2ns across a bandwidth of 1 to 15MHz.
The VCA610 has a noise figure of 3.5dB (with an RS
of 200) including the effects of both current and
voltage noise. Instantaneous output dynamic range is
70dB for gains of 0dB to +40dB with 1MHz noise
bandwidth. The output is capable of driving 100.
The high speed, 300dB/µs, gain control signal is a
unipolar (0 to –2V) voltage that varies the gain lin-
early in dB/V.
APPLICATIONS
q OPTICAL DISTANCE MEASUREMENT
q AGC AMPLIFIER
q ULTRASOUND
q SONAR
q ACTIVE FILTERS
q LOG AMPLIFIER
q IF CIRCUITS
q CCD CAMERAS
The VCA610 is designed with a very fast overload
recovery time of only 200ns. This allows a large
signal transient to overload the output at high gain,
without obscuring low-level signals following closely
behind. The excellent overload recovery time and
distortion specifications optimize this device for low-
level doppler measurements.
+5V –5V
6 72
–In
+In
VC
Gain
Control
8
1
3
VCA610
5
VOUT
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111 • Twx: 910-952-1111
Internet: http://www.burr-brown.com/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
©1992 Burr-Brown Corporation
PDS-1140D
Printed in U.S.A. January, 1995

1 Page





VCA610 pdf, ピン配列
PIN CONFIGURATION
Top View
–In –VS +VS VOUT
8765
DIP
SO-8
VCA610
1234
+In GND Gain No
Control, Internal
VC Connection
ABSOLUTE MAXIMUM RATINGS
Supply ................................................................................................. ±7V
Differential Input Voltage ............................................................... Total VS
Input Voltage Range ..................................... See Input Protection Section
Storage Temperature Range .......................................... –65°C to +150°C
Lead Temperature (soldering, DIP, 10s) ........................................ +300°C
Lead Temperature (soldering, SO-8, 3s) ....................................... +260°C
Output Short-Circuit to Ground (+25°C) ................................... Continuous
Junction Temperature (TJ) ............................................................. +175°C
PACKAGE/ORDERING INFORMATION
PRODUCT
PACKAGE
PACKAGE DRAWING
NUMBER(1)
VCA610PA
VCA610P
VCA610UA
VCA610U
8-Pin Plastic DIP
8-Pin Plastic DIP
SO-8 Surface-Mount
SO-8 Surface-Mount
006
006
182
182
NOTE:(1) For detailed drawing and dimension table, please see end of data
sheet, or Appendix C of Burr-Brown IC Data Book.
ELECTROSTATIC
DISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Burr-Brown
recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling
and installation procedures can cause damage.
ESD damage can range from subtle performance degrada-
tion to complete device failure. Precision integrated circuits
may be more susceptible to damage because very small
parametric changes could cause the device not to meet its
published specifications.
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes
no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant
any BURR-BROWN product for use in life support devices and/or systems.
®
3 VCA610


3Pages


VCA610 電子部品, 半導体
APPLICATIONS INFORMATION
CIRCUIT DESCRIPTION
The VCA610 is a wideband voltage amplifier with a
voltage-controlled gain, as modeled in Figure 1. The
circuit’s basic voltage amplifier responds to the control
of an internal gain control amplifier. At its input, the
voltage amplifier presents the high impedance of a dif-
ferential stage, permitting flexible input impedance matching.
To preserve termination options, no internal circuitry
connects to the input bases of this differential stage. For
this reason, the user should provide DC paths for the
input base currents either through a grounded termina-
tion resistor or a direct connection to ground. The differ-
ential input stage also permits rejection of common-
mode signals to remove ground bounce effects. At its
output, the voltage amplifier presents the low impedance
of class A-B emitter-follower stage, again simplifying
impedance matching. An open-loop design produces wide
bandwidth at all gain levels and avoids the added over-
load-recovery and propagation delays of feedback de-
signs. Repeated use of differential stages minimizes off-
set effects for reduced feedthrough of the gain control
signal. A ground-sensing, differential to single-ended
converter retains the low offset in the amplifier output
stage.
V+ GND V–
Voltage
Amplifier
–In
VO
+In
Gain Control
Circuit
to +40dB range as VC varies from 0 to –2V. Optionally,
making VC slightly positive, 0.1V, effectively disables the
amplifier, giving 80dB of attenuation at low frequencies.
Internally, the gain control circuit varies the amplifier gain
through a time-proven method which exploits the linear
relationship between the transconductance, gm, of a bipolar
transistor and the transistor’s bias current. Varying the bias
currents of differential stages varies gm to control the voltage
gain of the VCA610. Relying on transistor gm to set gain also
avoids the need for a noise-producing gain-set resistor in the
amplifier input circuit. This reliance normally introduces a
high thermal sensitivity to the gain. However, the VCA610
employs specialized analog signal processing that removes
this thermal effect.
INPUT/OUTPUT RANGE
The VCA610’s 80dB gain range allows the user to handle an
exceptionally wide range of input signal levels. If the unit’s
input and output voltage range specifications are exceeded,
however, signal distortion and amplifier overloading will
occur. The VCA610’s maximum input and output voltage
range is best illustrated in Figure 2.
OUTPUT POWER vs INPUT POWER
+10
Rs = 50
0 RL = 500
f = 1MHz
–10
++
–1dBm,
Compression
Points
+
–20 G = +40dB
+
6.33
3.0
2.0
0.633
0.20
–30 G = +20dB
0.063
+–40
G = 0dB
0.02
–50 Ideal
Actual
G = –20dB
+13.5dBm
(3Vp-p)
6E-3
–60
G = –40dB
2E-3
–60 –50 –40 –30 –20 –10 0 +10 +20
(6E-4) (0.002) (0.006) (0.02) (0.063) (0.2) (0.63) (2) (6.3)
Input Power in dBm (Differential Input Voltage in Vp-p)
VC
Gain Control
Amplifier
FIGURE 1. Block Diagram of the VCA610.
A user-applied voltage, VC, controls the amplifier’s gain
magnitude through a high-speed control circuit. Gain polar-
ity can be either inverting or noninverting depending upon
the amplifier input driven by the input signal. Use of the
inverting input is recommended since this connection tends
to minimize positive feedback from the output to the non-
inverting input. The gain control circuit presents the high
input impedance of a noninverting op amp connection.
Control voltage VC varies the amplifier gain according to the
exponential relationship G(V/V) = 10 –2 (Vc +1). This trans-
lates to the linear, logarithmic relationship G(dB) = – 40 –
40VC. Thus, G(dB) varies linearly over the specified –40dB
FIGURE 2. Input and Output Range.
Figure 2 plots output power vs input power for five voltage
gains spaced at 20dB intervals. The 1dBm compression
points occur where the actual output power (solid lines)
deviates by –1dBm from the ideal output power (dashed
lines). Compression is produced by different mechanisms
depending on the selected gain. For example, at G = –40dB,
1dBm compression occurs when the input signal approaches
approximately 3Vp-p (13.5dBm for RS = 50). Input over-
loading is the compression mechanism for all gains from
–40dB to about –5dB. For gains between –5dB and +5dB,
the compression is due to internal gain stage overloading.
Compression over this gain range occurs when the output
signal becomes distorted as internal gain stages become
overdriven. At G = 0dB, 1dBm compression occurs when
the input exceeds approximately 1.5Vp-p (7.5dBm). At
gains greater than about 5dB, the compression mechanism is
due to output stage overloading. Output overloading occurs
®
VCA610
6

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共有リンク

Link :


部品番号部品説明メーカ
VCA610

WIDEBAND VOLTAGE CONTROLLED AMPLIFIER

Burr-Brown Corporation
Burr-Brown Corporation
VCA610

Wideband Voltage Controlled Amplifier (Rev. A)

Texas Instruments
Texas Instruments


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