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Burr-Brown Corporation - Dual/ VARIABLE GAIN AMPLIFIER with Low-Noise Preamp

Numéro de référence VCA2613
Description Dual/ VARIABLE GAIN AMPLIFIER with Low-Noise Preamp
Fabricant Burr-Brown Corporation 
Logo Burr-Brown Corporation 





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VCA2613 fiche technique
VCA2613
VCA2613
SBOS179D – DECEMBER 2000 – REVISED OCTOBER 2004
Dual, VARIABLE GAIN AMPLIFIER
with Low-Noise Preamp
FEATURES
q LOW NOISE PREAMP:
Low Input Noise: 1.0nV/Hz
Active Termination Noise Reduction
Switchable Termination Value
80MHz Bandwidth
5dB to 25dB Gain
Differential In and Out
q LOW NOISE VARIABLE GAIN AMPLIFIER:
Low Noise VCA: 3.3nV/Hz, Differential
Programming Optimizes Noise Figure
24dB to 45dB Gain
40MHz Bandwidth
Differential In and Out
q LOW CROSSTALK: 52dB at Max Gain, 5MHz
q HIGH-SPEED VARIABLE GAIN ADJUST
q SWITCHABLE EXTERNAL PROCESSING
APPLICATIONS
q ULTRASOUND SYSTEMS
q WIRELESS RECEIVERS
q TEST EQUIPMENT
DESCRIPTION
The VCA2613 is a dual, Low-Noise Preamplifier (LNP), plus
low-noise Variable Gain Amplifier (VGA). The combination of
Active Termination (AT) and Maximum Gain Select (MGS)
allow for the best noise performance. The VCA2613 also
features low crosstalk and outstanding distortion perfor-
mance.
The LNP has differential input and output capability and is
strappable for gains of 5dB, 17dB, 22dB or 25dB. Low input
impedance is achieved by AT, resulting in as much as a 4.6dB
improvement in noise figure over conventional shunt termina-
tion. The termination value can also be switched to accommo-
date different sources. The output of the LNP is available for
external signal processing.
The variable gain is controlled by an analog voltage whose
gain varies from 0dB to the gain set by the MGS. The ability
to program the variable gain also allows the user to optimize
dynamic range. The VCA input can be switched from the
LNP to external circuits for different applications. The output
can be used in either a single-ended or differential mode to
drive high-performance Analog-to-Digital (A/D) converters,
and is cleanly limited for optimum overdrive recovery.
The combination of low noise, gain, and gain range program-
mability makes the VCA2613 a versatile building block in a
number of applications where noise performance is critical.
The VCA2613 is available in a TQFP-48 package.
FBCNTL
LNPOUTN VCAINN
RF2 FBSW
RF1 FB
VCA2613
(1 of 2 Channels)
VCACNTL
Analog
Control
Input
LNPINP
LNPGS1
LNP LNPGS2
Gain Set
LNPGS3
LNPINN
Low Noise
Preamp
5dB to 25dB
Voltage
Controlled
Attenuator
Maximum Gain Select
MGS0 MGS1 MGS2
Maximum Gain
Select
Programmable
Gain Amplifier
24 to 45dB
VCAOUTN
VCAOUTP
LNPOUTP VCAINP
SEL
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
www.ti.com
Copyright © 2000-2004, Texas Instruments Incorporated

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