VCA2618 Datasheet, PDF (1/14 Pages) Burr-Brown (TI) – Dual, VARIABLE GAIN AMPLIFIER with Input Buffer

VCA2618
VCA2618
SBOS254B – JULY 2002 – REVISED NOVEMBER 2003
Dual, VARIABLE GAIN AMPLIFIER
with Input Buffer
FEATURES
z GAIN RANGE: up to 43dB
z 30MHz BANDWIDTH
z LOW CROSSTALK: 65dB at Max Gain, 5MHz
z HIGH-SPEED VARIABLE GAIN ADJUST
z POWER SHUTDOWN MODE
z HIGH IMPEDANCE INPUT BUFFER
APPLICATIONS
z ULTRASOUND SYSTEMS
z WIRELESS RECEIVERS
z TEST EQUIPMENT
z RADAR
DESCRIPTION
The VCA2618 is a highly integrated, dual receive channel,
Variable Gain Amplifier (VGA) with analog gain control.
The VCA2618’s VGA section consists of two parts: the Volt-
age Controlled Attenuator (VCA) and the Programmable Gain
Amplifier (PGA). The gain and gain range of the PGA can be
digitally programmed. The combination of these two program-
mable elements results in a variable gain ranging from 0dB up
to a maximum gain as defined by the user through external
connections. The single-ended unity gain input buffer provides
predictable high input impedance. The output of the VGA can
be used in either a single-ended or differential mode to drive
high-performance Analog-to-Digital (A/D) converters. A sepa-
rate power-down pin reduces power consumption.
The VCA2618 also features low crosstalk and outstanding
distortion performance. The combination of low noise
and gain range programmability make the VCA2618 a versa-
tile building block in a number of applications where
noise performance is critical. The VCA2618 is available in a
TQFP-32 package.
C_P2A
C_P1A
VCA2618
(1 of 2 Channels)
Voltage
IN_A
Buffer
Control
Attenuator
VCA_CNTL
Analog
Control
Programmable
Gain Amplifier
Maximum Gain
Select
N_OUTA
P_OUTA
MGS₁
MGS₂
MGS₃
Maximum
Gain Select
Voltage
IN_B
Buffer
Control
Attenuator
Programmable
Gain Amplifier
N_OUTB
P_OUTB
C_P2B
C_P1B
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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.
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