IC OPAMP VGA R-R 30MHZ SGL 8DIP

VCA610PA

Manufacturer Part NumberVCA610PA
DescriptionIC OPAMP VGA R-R 30MHZ SGL 8DIP
ManufacturerTexas Instruments
VCA610PA datasheet
 


Specifications of VCA610PA

Amplifier TypeVariable GainNumber Of Circuits1
Output TypeRail-to-RailSlew Rate60 V/µs
-3db Bandwidth30MHzCurrent - Supply30mA
Current - Output / Channel80mAVoltage - Supply, Single/dual (±)±4.5 V ~ 5.5 V
Operating Temperature-25°C ~ 85°CMounting TypeThrough Hole
Package / Case8-DIP (0.300", 7.62mm)Lead Free Status / RoHS StatusContains lead / RoHS non-compliant
Gain Bandwidth Product-Current - Input Bias-
Voltage - Input Offset-  
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VOLTAGE CONTROLLED AMPLIFIER
FEATURES
WIDE GAIN CONTROL RANGE: 77dB
SMALL PACKAGE: SO-8
WIDE SIGNAL BANDWIDTH: 30MHz
LOW VOLTAGE NOISE: 2.2nV/ Hz
FAST GAIN SLEW RATE: 300dB/ s
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 77dB
(–38.5dB to +38.5dB) providing both gain and attenu-
ation for maximum flexibility in a small SO-8. The
broad attenuation range can be used for gradual or
controlled channel turn-on and turn-off for applica-
tions in which abrupt gain changes can create artifacts
or other errors. In addition, the output can be disabled
to provide –77dB of attenuation. Group delay varia-
tion with gain is typically less than 2ns across a
bandwidth of 1MHz to 15MHz.
The VCA610 has a noise figure of 3.5dB (with an R
of 200 ) including the effects of both current and
voltage noise. Instantaneous output dynamic range is
70dB for gains of 0dB to +38.5dB with 1MHz noise
bandwidth. The output is capable of driving 100 .
The high-speed, 300dB/ s, gain-control signal is a
unipolar (0V to –2V) voltage that varies the gain
linearly in dB/V over a –38.5dB to +38.5dB range.
Copyright © 2000, Texas Instruments Incorporated
WIDEBAND
APPLICATIONS
OPTICAL DISTANCE MEASUREMENT
AGC AMPLIFIERS
ULTRASOUND
SONAR
ACTIVE FILTERS
LOG AMPLIFIERS
IF CIRCUITS
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.
8
–In
S
1
+In
3
V
C
Gain
Control
SBOS013A
VCA610
+5V –5V
6
7
2
5
V
OUT
VCA610
Printed in U.S.A. November, 2000

VCA610PA Summary of contents

  • Page 1

    ... The output is capable of driving 100 . The high-speed, 300dB/ s, gain-control signal is a unipolar (0V to –2V) voltage that varies the gain linearly in dB/V over a –38.5dB to +38.5dB range. Copyright © 2000, Texas Instruments Incorporated WIDEBAND APPLICATIONS OPTICAL DISTANCE MEASUREMENT AGC AMPLIFIERS ...

  • Page 2

    SPECIFICATIONS ELECTRICAL All specifications 5V 500 , and PARAMETER INPUT NOISE Input Voltage Noise Input Current Noise Noise Figure V C INPUT Input Impedance Bias Current Offset ...

  • Page 3

    ABSOLUTE MAXIMUM RATINGS Supply ................................................................................................. 7V Differential Input Voltage .............................................................. Total V Input Voltage Range ..................................... See Input Protection Section Storage Temperature Range .......................................... – +150 C Lead Temperature (soldering, DIP, 10s) ........................................ +300 C Lead Temperature (soldering, ...

  • Page 4

    TYPICAL PERFORMANCE CURVES TYPICAL PERFORMANCE CURVES 5V 500 , and T = +25 C, unless otherwise noted SMALL-SIGNAL RESPONSE vs GAIN 48.125 V = –2.0V C 38.5 ...

  • Page 5

    TYPICAL PERFORMANCE CURVES 5V 500 , and T = +25 C, unless otherwise noted GROUP DELAY vs GAIN 16 14 1MHz 12 10MHz 10 8 15MHz 6 ...

  • Page 6

    APPLICATIONS INFORMATION CIRCUIT DESCRIPTION The VCA610 is a wideband voltage amplifier with a volt- age-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 ...

  • Page 7

    Output overloading occurs when either the maximum output voltage swing or output current is exceeded. The VCA610’s high output current of 80mA insures that virtually all output overloads will be limited by voltage swing rather than by current limiting. At ...

  • Page 8

    The VCA610’s gain-control input has a –3dB bandwidth of 1MHz and varies with frequency, as shown in the Typical Performance Curves. This wide bandwidth, although useful for many applications, can allow high-frequency noise to modulate the gain control input. In ...

  • Page 9

    VCA610 with time. The gain control provides signal apodization or windowing with transducer arrays connected to amplifier arrays. Selective weighting of amplifier gains across the transducer aperture suppresses side lobe effects in ...

  • Page 10

    C W1 4700pF V– FIGURE 8. Adding Wein-Bridge Feedback to the AGC Circuit of Figure 7 Produces an Amplitude-Stabilized Oscillator. STABILIZED WEIN-BRIDGE OSCILLATOR Adding Wein-bridge feedback to the above AGC amplifier produces an amplitude-stabilized oscillator. Shown in Figure 8, this ...

  • Page 11

    Examination of this result illustrates several circuit charac- teristics. First, the argument of the log term, –V reveals an option and a constraint. In Figure reference voltage. Optionally, making this voltage a second signal produces log-ratio ...

  • Page 12

    Additionally, this attenuation transfers an output swing limitation from the OPA680 output to the overall circuit’s output. Note that OPA680 output voltage, V relates to V through the expression < 1 limits the maximum V swing ...

  • Page 13

    330 C 0.047 F OPA680 FIGURE 13. Adding the VCA610 to a State-Variable Filter Produces a Voltage-Controlled BandPass Filter With a Center Frequency Variable Over a 100:1 Range. VOLTAGE-CONTROLLED BAND-PASS FILTER The VCA610’s variable gain ...

  • Page 14

    ... Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’ ...