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부품번호 | VCA2618 기능 |
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기능 | Dual/ VARIABLE GAIN AMPLIFIER with Input Buffer | ||
제조업체 | Burr-Brown Corporation | ||
로고 | |||
전체 14 페이지수
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.
CP2A
CP1A
VCA2618
(1 of 2 Channels)
Voltage
INA Buffer Control
Attenuator
VCACNTL
Analog
Control
Programmable
Gain Amplifier
Maximum Gain
Select
NOUTA
POUTA
MGS1
MGS2
MGS3
Maximum
Gain Select
Voltage
INB Buffer Control
Attenuator
Programmable
Gain Amplifier
NOUTB
POUTB
CP2B
CP1B
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.
Copyright © 2002–2003, Texas Instruments Incorporated
www.ti.com
TYPICAL CHARACTERISTICS
At TA = +25°C, VDD = 5V, load resistance = 500Ω on each output to ground, differential output (2VPP) MGS = 111, and fIN = 5MHz, unless otherwise noted.
GAIN vs VCA
50
MGS = 111
45
MGS = 110
40
MGS = 101
35
MGS = 100
30
25
20
MGS = 001
15
MGS = 010
10
MGS = 011
5
0
–5
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
+85°C
1.5
+25°C
1.0
0.5
0
–0.5
–40°C
–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
2.5
2.0
1.5
10MHz
1.0
0.5
0
–0.5
5MHz
1MHz
–1.0
–1.5
–2.0
–2.5
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
2.5
MGS = 001
2.0
MGS = 011
1.5
1.0
0.5
0
MGS = 111
–0.5
–1.0
–1.5
–2.0
–2.5
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, VCACNTL = 0.2V
50
45
40
35
30
25
20
15
10
5
0
Delta Gain (dB)
GAIN MATCH: CHA to CHB, VCACNTL = 3.0V
45
40
35
30
25
20
15
10
5
0
Delta Gain (dB)
4 VCA2618
www.ti.com
SBOS254B
4페이지 TYPICAL CHARACTERISTICS (Cont.)
At TA = +25°C, VDD = 5V, load resistance = 500Ω on each output to ground, differential output (2VPP) MGS = 111, and fIN = 5MHz, unless otherwise noted.
–30
–35
–40
–45
–50
–55
–60
–65
–70
–75
–80
–85
–90
100k
HARMONIC DISTORTION vs FREQUENCY
(Single-Ended, 1Vp-p, MGS = 111)
1M
Frequency (Hz)
VCACNTL = 0.2V, H2
VCACNTL = 0.2V, H3
VCACNTL = 3.0V, H2
VCACNTL = 3.0V, H3
10M
HARMONIC DISTORTION vs VCACNTL
(Differential, 2Vp-p)
0
–5 MGS = 001, H2
–10 MGS = 011, H2
–15
–20
MGS = 111, H2
MGS = 001, H3
MGS = 011, H3
–25 MGS = 111, H3
–30
–35
–40
–45
–50
–55
–60
–65
–70
–75
–80
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)
HARMONIC DISTORTION vs VCACNTL
(Single-Ended, 1Vp-p)
0
–5 MGS = 001, H2
–10
–15
MGS = 011, H2
MGS = 111, H2
MGS = 001, H3
–20 MGS = 011, H3
–25 MGS = 111, H3
–30
–35
–40
–45
–50
–55
–60
–65
–70
–75
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)
INTERMODULATION DISTORTION
(Single-Ended, 1Vp-p, fIN = 10MHz, VCACNTL = 3.0V)
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
9.5 9.6 9.7 9.8 9.9 10.0 10.1 10.2 10.3 10.4 10.5
Frequency (MHz)
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
9.5
INTERMODULATION DISTORTION
(Differential, 2Vp-p, fIN = 10MHz, VCACNTL = 3.0V)
9.6 9.7 9.8 9.9 10 10.1 10.2 10.3 10.4 10.5
Frequency (MHz)
CROSS TALK vs FREQUENCY
(Differential, 2Vp-p, MGS = 011)
0
–10
VCACNTRL = 0V
–20
–30
–40
VCACNTRL = 1.5V
–50
–60
–70
VCACNTRL = 3.0V
–80
–90
1
6 11 16
Frequency (MHz)
21
VCA2618
SBOS254B
www.ti.com
7
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