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PDF VCA2619 Data sheet ( Hoja de datos )
| Número de pieza | VCA2619 | |
| Descripción | Dual Variable Gain Amplifier with Input Buffer | |
| Fabricantes | Burr-Brown Corporation | |
| Logotipo |  |
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VCA2619
SBOS276A − AUGUST 2003 − REVISED AUGUST 2003
Dual, Variable Gain Amplifier
with Input Buffer
FEATURES
D GAIN RANGE: 50dB
D LOW CROSSTALK: -60dB at Max Gain,
fIN = 5MHz
D HIGH−SPEED VARIABLE GAIN ADJUST
D POWER SHUTDOWN MODE
D HIGH IMPEDANCE INPUT BUFFER
APPLICATIONS
D ULTRASOUND SYSTEMS
D WIRELESS RECEIVERS
D TEST EQUIPMENT
D RADAR
DESCRIPTION
The VCA2619 is a highly integrated, dual receive channel,
Variable Gain Amplifier (VGA) with analog gain control.
The VCA2619s 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 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 separate power−down pin
reduces power consumption.
The VCA2619 also features low crosstalk and outstanding
distortion performance. The combination of low noise and
gain range programmability make the VCA2619 a versatile
building block in a number of applications where noise
performance is critical. The VCA2619 is available in a
TQFP−32 package.
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 2003, Texas Instruments Incorporated
www.ti.com
1 page  
VCA2619
www.ti.com
SBOS276A − AUGUST 2003 − REVISED AUGUST 2003
TYPICAL CHARACTERISTICS
At TA = 25°C and VDD = 5V, load resistance = 500Ω on each output to ground, differential output (2VPP) MGS = 111, and fIN = 5MHz, unless
otherwise noted.
GAIN vs VCA
46
42 MGS = 111
38 MGS = 110
34 MGS = 101
30
26
22
18 MGS = 010
14
10 MGS = 011
6
2 MGS = 100
−2
−6
−10
−14
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
3.0
2.5
2.0
1.5
1.0
10MHz
0.5
0
−0.5
−1.0
−1.5
5MHz
1MHz
−2.0
−2.5
−3.0
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
0.5 0.7 0.9 1.1 1.3 1.5 1.7 1.9 2.1 2.3 2.5 2.7 2.9
VCACNTL (V)
GAIN MATCH: CHA to CHB, VCACNTL = 0.4V
45
40
35
30
25
20
15
10
5
0
GAIN ERROR vs TEMPERATURE
3.0
2.5
2.0 +85_C
1.5
1.0 +25_ C
0.5
0
−0.5
−1.0
−1.5
−2.0
−2.5
−40_C
−3.0
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
0.5 0.7 0.9 1.1 1.3 1.5 1.7 1.9 2.1 2.3 2.5 2.7 2.9
VCACNTL (V)
GAIN ERROR vs VCACNTL
3.0
2.5
2.0
1.5 MGS = 010
1.0
0.5 MGS = 100
0
−0.5
−1.0
−1.5
MGS = 111
−2.0
−2.5
−3.0
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
0.5 0.7 0.9 1.1 1.3 1.5 1.7 1.9 2.1 2.3 2.5 2.7 2.9
VCACNTL (V)
GAIN MATCH: CHA to CHB, VCACNTL = 2.9V
45
40
35
30
25
20
15
10
5
0
Delta Gain (dB)
Delta Gain (dB)
5
5 Page 
www.ti.com
VCA2619
SBOS276A − AUGUST 2003 − REVISED AUGUST 2003
Attenuator
Input
RS
A1 to A10 Attenuator Stages
QS
Attenuator
Output
VCM
A1
Q1
A2
Q2
A3
Q3
A4
Q4
A5
Q5
A6
Q6
A7
Q7
A8
Q8
A9
Q9
A10
Q10
C1 C2 C3 C4 C5
C6 C7 C8 C9 C10
V1 V2
V3 V4
V5
V6 V7 V8 V9 V10
Control
Input
C1 to C10 Clipping Amplifiers
0dB
−5.2dB
VCM − VT
Attenuation Characteristic of Individual FETs
0
V1 V2 V3 V4 V5 V6 V7 V8 V9 V10
Characteristic of Attenuator Control Stage Output
OVERALL CONTROL CHARACTERISTICS OF ATTENUATOR
0dB
−52.3dB
0.2V
Control Signal
3V
Figure 4. Piecewise Approximation to Logarithmic Control Characteristics.
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet VCA2619.PDF ] | |
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