VCA2612Y/250 ,Dual Variable-Gain Amplifier With Low Noise Pre-AmpPIN CONFIGURATION48 47 46 45 44 43 42 41 40 39 38 37V A 1 36 V BDD DDNC 2 35 NCNC 3 34 NCVCA NA 4 3 ..
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W29C040P-90B , 512K X 8 CMOS FLASH MEMORY
W29C040T-12 , 512K X 8 CMOS FLASH MEMORY
W29C040T-12B , 512K X 8 CMOS FLASH MEMORY
W29C040T-90 , 512K X 8 CMOS FLASH MEMORY
W29C040T-90B , 512K X 8 CMOS FLASH MEMORY
W29C040T-90B , 512K X 8 CMOS FLASH MEMORY
VCA2612Y/250
Dual Variable-Gain Amplifier With Low Noise Pre-Amp
Dual, VARIABLE GAIN AMPLIFIER
with Low Noise Preamp
FEA TURES LOW NOISE PREAMP:
• Low Input Noise: 1.25nV/ √Hz
• Active Termination Noise Reduction
• Switchable Termination Value
• 80MHz Bandwidth
• 5dB to 25dB Gain Range
• Differential Input/Output LOW NOISE VARIABLE GAIN AMPLIFIER:
• Low Noise VCA: 3.3nV/ √Hz, Differential
Programming Optimizes Noise Figure
• 24dB to 45dB Gain
• 40MHz Bandwidth
• Differential Input/Output LOW CROSSTALK: 52dB at Max Gain, 5MHz HIGH-SPEED VARIABLE GAIN ADJUST SWITCHABLE EXTERNAL PROCESSING
APPLICA TIONS ULTRASOUND SYSTEMS WIRELESS RECEIVERS TEST EQUIPMENT
VCA2612
DESCRIPTIONThe VCA2612 is a highly integrated, dual receive channel,
signal processing subsystem. Each channel of the product
consists of a low noise preamplifier (LNP) and a Variable
Gain Amplifier (VGA). The LNP circuit provides the neces-
sary connections to implement Active Termination (AT), a
method of cable termination which results in up to 4.6dB
noise figure improvement. Different cable termination char-
acteristics can be accommodated by utilizing the VCA2612’s
switchable LNA feedback pins. The LNP has the ability to
accept both differential and single-ended inputs, and gener-
ates a differential output signal. The LNP provides strappable
gains of 5dB, 17dB, 22dB, and 25dB.
The output of the LNP can be accessed externally for further
signal processing, or fed directly into the VGA. The VCA2612’s
VGA section consists of two parts: the Voltage 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 programmable
elements results in a variable gain ranging from 0dB up to a
maximum gain as defined by the user through external
connections. 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.
The VCA2612 also features low crosstalk and outstanding
distortion performance. The combination of low noise and gain
range programmability make the VCA2612 a versatile building
block in a number of applications where noise performance is
critical. The VCA2612 is available in a TQFP-48 package.
RF2
RF1 FB
SWFB
LNPINPCC
Input
LNPOUTP SELVCAINP
LNPOUTNVCAINNVCACNTLFBSWCNTL
VCAOUTP
VCAOUTN
Maximum Gain Select
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.
SBOS117C – SEPTEMBER 2000 – REVISED APRIL 2004
