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Número de pieza | VCA2612 | |
Descripción | TMDual/ VARIABLE GAIN AMPLIFIER with Low Noise Preamp | |
Fabricantes | Burr-Brown Corporation | |
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VCA2612
VCA2612
For most current data sheet and other product
information, visit www.burr-brown.com
TM Dual, VARIABLE GAIN AMPLIFIER
with Low Noise Preamp
FEATURES
DESCRIPTION
q LOW NOISE PREAMP:
• Low Input Noise: 1.25nV/√Hz
• Active Termination Noise Reduction
• Switchable Termination Value
• 80MHz Bandwidth
• 5dB to 25dB Gain
• Differential Input /Output
q 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
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
The VCA2612 is a highly integrated, dual receive chan-
nel, signal processing subsystem. Each channel of the
product consists of a low noise pre-amplifier (LNP) and
a Variable Gain Amplifier (VGA). The LNP circuit
provides the necessary connections to implement Active
Termination (AT), a method of cable termination which
results in up to 4.6dB noise figure improvement. Differ-
ent cable termination characteristics can be accommo-
dated by utilizing the VCA2612’s switchable LNA feed-
back pins. The LNP has the ability to accept both
differential and single ended inputs, and generates 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 Program-
mable Gain Amplifier (PGA). The gain and gain range
of the Programmable Gain Amplifier 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 output of the VGA
can be used in either a single-ended or differential mode
to drive high performance analog-to-digital converters.
The VCA2612 also features low crosstalk and outstand-
ing 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.
FBCNTL
LNPOUTN VCAINN
RF2 FBSW
RF1 FB
VCA2612
(1 of 2 Channels)
VCACNTL
Analog
Control
Maximum Gain Select
MGS1 MGS2 MGS3
Maximum Gain
Select
Input
LNPINP
LNPGS1
LNP LNPGS2
Gain Set
LNPGS3
LNPINN
Low Noise
Preamp
5dB to 25dB
Voltage
Controlled
Attenuator
Programmable
Gain Amplifier
24 to 45dB
VCAOUTN
VCAOUTP
LNPOUTP VCAINP
SEL
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111
Twx: 910-952-1111 • Internet: http://www.burr-brown.com/ • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
© 2000 Burr-Brown Corporation
PDS-11541B
VPCrinAted2in6U1.S.2A. March, 2000
®
1 page TYPICAL PERFORMANCE CURVES
At TA = +25°C, VDD = 5V, load resistance = 500Ω on each output to ground, MGS = 011, LNP = 22dB and fIN = 5MHz, unless otherwise noted. The input to the
preamp (LNP) is single-ended, and the output from the VCA is single-ended unless otherwise noted.
GAIN vs VCACNTL
65
MGS = 111
60
MGS = 110
55
MGS = 101
50
45
MGS = 100
40
35
MGS = 011
30
MGS = 010
25
MGS = 001
20
MGS = 000
15
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0
VCACNTL (V)
GAIN ERROR vs TEMPERATURE
2.0
1.5
1.0 –40°C
+25°C
0.5
0
–0.5
–1.0
+85°C
–1.5
–2.0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0
VCACNTL (V)
GAIN ERROR vs VCACNTL
2.0
1.5
1.0 1MHz
0.5
10MHz
0
–0.5
5MHz
–1.0
–1.5
–2.0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0
VCACNTL (V)
GAIN ERROR vs VCACNTL
2.0
1.5
1.0
MGS = 000
MGS = 011
0.5
0
–0.5
–1.0
–1.5
MGS = 111
–2.0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0
VCACNTL (V)
GAIN MATCH: CHA to CHB = 0.2V
100
90
80
70
60
50
40
30
20
10
0
–0.5 –0.4 –0.3 –0.2 –0.1 0.0 0.1 0.2 0.3 0.4 0.5
Delta Gain (dB)
GAIN MATCH: CHA to CHB = 3.0V
100
90
80
70
60
50
40
30
20
10
0
–0.5 –0.4 –0.3 –0.2 –0.1 0.0 0.1 0.2 0.3 0.4 0.5
Delta Gain (dB)
®
5 VCA2612
5 Page TYPICAL PERFORMANCE CURVES (Cont.)
At TA = +25°C, VDD = 5V, load resistance = 500Ω on each output to ground, MGS = 011, LNP = 22dB and fIN = 5MHz, unless otherwise noted. The input to the
preamp (LNP) is single-ended, and the output from the VCA is single-ended unless otherwise noted.
ICC vs TEMPERATURE
80
79.5
79
78.5
78
77.5
77
76.5
76
–40 –25 –10
5
20 35 50 65 80 95
Temperature (°C)
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
1
GROUP DELAY vs FREQUENCY
VCACNTL = 3.0V
VCACNTL = 0.2V
10
Frequency (MHz)
100
–45
–40
–35
–30
–25
–20
–15
–10
–5
0
5
10
1.E+01
1.E+02
PSRR vs FREQUENCY
1.E+03 1.E+04 1.E+05
Frequency (Hz)
1.E+06
1.E+07
®
11 VCA2612
11 Page |
Páginas | Total 19 Páginas | |
PDF Descargar | [ Datasheet VCA2612.PDF ] |
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