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,
f
IN
= 5MHz
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.
D
HIGH−SPEED VARIABLE GAIN ADJUST
D
POWER SHUTDOWN MODE
D
HIGH IMPEDANCE INPUT BUFFER
APPLICATIONS
D
D
D
D
ULTRASOUND SYSTEMS
WIRELESS RECEIVERS
TEST EQUIPMENT
RADAR
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
VCA2619
www.ti.com
SBOS276A − AUGUST 2003 − REVISED AUGUST 2003
ABSOLUTE MAXIMUM RATINGS
(1)
Power Supply (+VS)
Analog Input
Logic Input
Case Temperature
Junction Temperature
+6V
−0.3V to (+VS + 0.3V)
−0.3V to (+VS + 0.3V)
+100°C
+150°C
This integrated circuit can be damaged by ESD.
Texas Instruments recommends that all
integrated circuits be handled with appropriate
precautions. Failure to observe proper handling and
installation procedures can cause damage.
ESD damage can range from subtle performance degradation
to complete device failure. Precision integrated circuits may
be more susceptible to damage because very small
parametric changes could cause the device not to meet its
published specifications.
Storage Temperature
−40°C to +150°C
(1) Stresses above those listed under “Absolute Maximum Ratings”
may cause permanent damage to the device. Exposure to
absolute maximum conditions for extended periods may affect
device reliability.
PACKAGE/ORDERING INFORMATION
PRODUCT
PACKAGE-LEAD
PACKAGE
DESIGNATOR(1)
PBS
SPECIFIED
TEMPERATURE
RANGE
−40°C to +85°C
PACKAGE
MARKING
VCA2619Y
ORDERING NUMBER
VCA2619YT
VCA2619Y
TQFP−32
VCA2619YR
TRANSPORT MEDIA,
QUANTITY
Tape and Reel, 250
Tape and Reel, 2000
(1) For the most current specification and package information, refer to our web site at www.ti.com.
2
VCA2619
www.ti.com
SBOS276A − AUGUST 2003 − REVISED AUGUST 2003
ELECTRICAL CHARACTERISTICS
At TA = +25°C, VDD = 5V, load resistance = 500
Ω
on each output to ground single−ended output (1Vpp), MGS = 111, VCACNTL = 2.9V and
fIN = 5MHz, unless otherwise noted.
VCA2619
PARAMETER
BUFFER
Input Resistance
Input Capacitance
Input Bias Current
Maximum Input Voltage
Input Voltage Noise
Input Current Noise
Noise Figure
Bandwidth
PROGRAMMABLE VARIABLE GAIN AMPLIFIER
Peak Input Voltage
−3dB
Bandwidth
Slew Rate
Output Signal Range
Output Impedance
Output Short−Circuit Current
3rd-Harmonic Distortion
2nd-Harmonic Distortion
2nd-Harmonic Distortion
Overload Performance (2nd-Harmonic Distortion)
Time Delay
IMD, 2−Tone
Crosstalk
ACCURACY
Gain Slope
Gain Error(1)
Output Offset Voltage
Gain Range
GAIN CONTROL INTERFACE
Input Voltage (VCACNTL) Range
Input Resistance
Response Time
POWER SUPPLY
Specified Operating Range
Power Dissipation
Power−Down
4.75
5.0
240
9.2
5.25
300
V
mW
mW
45dB Gain Change
0 to 3.0
1
0.2
V
MΩ
µs
VCACNTL = 0.4V to 2.9V
VCACNTL = 0.2V to 3.0V
VCACNTL = 0.4V to 2.9V
VCACNTL = 0.2V to 3.0V
VCACNTL = 0.4V to 2.9V
20
±2.75
±1.50
±50
52
50
dB/V
dB
dB
mV
dB
dB
VOUT = 2Vpp, f = 9.95MHz
2Vpp Differential
VOUT = 1Vpp, VCACNTL = 2.9V
VOUT = 1Vpp, VCACNTL = 2.9V
Differential, VOUT = 2Vpp, VCACNTL = 3.0V, MGS = 011
Input Signal = 0.5Vpp, VCACNTL = 2V
−45
−42
RL
≥
500Ω Each Side to Ground
1
20
300
2.5
±1
1
±40
−60
−50
−50
−40
to
−45
5
−59
−60
Vpp
MHz
V/µs
V
Ω
mA
dBc
dBc
dBc
dB
ns
dBc
dB
PGA Gain = 45dB, RS = 50Ω
Independent of Gain
RF = 550Ω, PGA Gain = 45dB, RS = 75Ω
CONDITIONS
MIN
TYP
MAX
UNIT
kΩ
pF
nA
Vpp
nV/√Hz
fA/√Hz
dB
MHz
600
5
1
1
5.9
350
13
100
±2.0
48
(1) Referenced to best fit dB−linear curve.
3
VCA2619
www.ti.com
SBOS276A − AUGUST 2003 − REVISED AUGUST 2003
PIN CONFIGURATION
GND
A
N
OUTA
25
24
23
22
21
VCA2619
5
6
7
8
20
19
18
17
P
OUTA
26
V
DDA
28
C
P2A
30
C
P1A
29
NC
32
NC
31
+IN
A
NC
V
DDR
V
BIAS
V
CM
GND
R
NC
+IN
B
1
2
3
4
27
VCA
CNTL
MGS
3
MGS
2
MGS
1
PD
NC
NC
DNC
10
11
12
13
14
15
P
OUTB
NC
NC
V
DDB
C
P2B
C
P1B
GND
B
PIN CONFIGURATION
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
DESIGNATOR
+INA
NC
VDDR
VBIAS
VCM
GNDR
NC
+INB
NC
NC
CP2B
CP1B
VDDB
GNDB
POUTB
NOUTB
DESCRIPTION
Noninverting Input Channel A
No Internal Connection
Internal Reference Supply
Bias Voltage
Common−Mode Voltage
Internal Reference Ground
No Internal Connection
Noninverting Input Channel B
No Internal Connection
No Internal Connection
Coupling Capacitor Channel B
Coupling Capacitor Channel B
+5V Supply Channel B
Ground Channel B
Positive Output Channel B
Negative Output Channel B
17
18
19
20
23
22
23
24
25
26
27
28
29
30
31
32
PIN
DESIGNATOR
DNC
NC
NC
PD
MGS1
MGS2
MGS3
VCACNTL
NOUTA
POUTA
GNDA
VDDA
CP1A
CP2A
NC
NC
DESCRIPTION
Do Not Connect
No Internal Connection
No Internal Connection
Power-Down (Active LOW)
Maximum Gain Select 1 (MSB)
Maximum Gain Select 2
Maximum Gain Select 3 (LSB)
VCA Analog Control
Negative VCA Output Channel A
Positive VCA Output Channel A
Ground Channel A
+5V Supply Channel A
Coupling Capacitor Channel A
Coupling Capacitor Channel A
No Internal Connection
No Internal Connection
4
N
OUTB
16
9
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
38
34
30
26
22
18
14
10
6
2
−2
−6
−10
−
14
MGS = 111
MGS = 110
MGS = 101
Gain Error (dB)
3.0
2.5
2.0
1.5
1.0
0.5
0
−0.5
−
1.0
−1.5
−2.0
−2.5
−3.0
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
GAIN ERROR vs TEMPERATURE
+85_C
+25_ C
Gain (dB)
MGS = 010
MGS = 011
MGS = 100
−40_C
VCA
CNTL
(V)
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
VCA
CNTL
(V)
GAIN ERROR vs VCA
CNTL
3.0
2.5
2.0
1.5
Gain Error (dB)
10MHz
Gain Error (dB)
1.0
0.5
0
−
0.5
−1.0
−1.5
−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
GAIN ERROR vs VCA
CNTL
3.0
2.5
2.0
1.5
1.0
0.5
0
−0.5
−
1.0
−1.5
−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
2.9
0.5
0.7
0.9
1.1
1.3
1.5
1.7
1.9
2.1
2.3
2.5
2.7
MGS = 010
MGS = 100
5MHz
1MHz
MGS = 111
VCA
CNTL
(V)
VCA
CNTL
(V)
GAIN MATCH: CHA to CHB, VCA
C NT L
= 2.9V
GAIN MATCH: CHA to CHB, VCA
C NTL
= 0.4V
45
40
35
30
Units
Units
−
0.99
−
0.91
−
0.83
−0.75
−0.67
−0.59
−0.51
−0.42
−0.34
−
0.26
−
0.18
−
0.10
−0.02
0.06
0.14
0.22
0.30
0.38
0.47
More
25
20
15
10
5
0
45
40
35
30
25
20
15
10
5
0
−0.16
−0.14
−0.13
−0.11
−0.09
−
0.08
−
0.06
−
0.04
−0.03
−0.01
0.01
0.02
0.04
0.06
0.07
0.09
0.11
0.12
0.14
More
Delta Gain (dB)
Delta Gain (dB)
5
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