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VCA2618YT
Dual/ VARIABLE GAIN AMPLIFIER with Input Buffer
FEA TURESzzzz
GAIN RANGE: up to 43dBzzzz
30MHz BANDWIDTHzzzz
LOW CROSSTALK: 65dB at Max Gain, 5MHzzzzz
HIGH-SPEED VARIABLE GAIN ADJUSTzzzz
POWER SHUTDOWN MODEzzzz
HIGH IMPEDANCE INPUT BUFFER
APPLICA TIONSzzzz
ULTRASOUND SYSTEMSzzzz
WIRELESS RECEIVERSzzzz
TEST EQUIPMENTzzzz
RADAR
VCA2618
Dual, VARIABLE GAIN AMPLIFIERwith Input Buffer
DESCRIPTIONThe 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.
SBOS254B – JULY 2002 – REVISED NOVEMBER 2003
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
INA
VCACNTL
CP2A CP1A
POUTA
NOUTA
MGS1
MGS2
MGS3
Maximum Gain SelectINB
CP2B CP1B
POUTB
NOUTB
