SN761643_14 [TI]
AGC AMPLIFIER;型号: | SN761643_14 |
厂家: | TEXAS INSTRUMENTS |
描述: | AGC AMPLIFIER 放大器 |
文件: | 总10页 (文件大小:842K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
SN761643
www.ti.com ..................................................................................................................................................................................................... SLES246–APRIL 2009
AGC AMPLIFIER
1
FEATURES
DGK PACKAGE
(TOP VIEW)
•
Low-Distortion Automatic Gain Control (AGC)
Amplifier
•
•
•
5-V Power Supply
V
1
2
3
4
8
7
6
5
GND1
OUT1
OUT2
GND2
CC
8-Pin Mini Small-Outline Package (MSOP)
Wide Gain Control Range
IN1
IN2
APPLICATIONS
•
•
•
Digital TVs
Digital CATVs
Digital Set-Top Boxes (STBs)
AGC Control
AGC
DESCRIPTION
The SN761643 is an automatic gain control (AGC) amplifier for the TV tuner system of a digital TV, CATV, or
STB. The circuit consists of three stages of controlled-gain amplification, followed by a fixed-gain output
amplifier.
The device is packaged in an 8-pin MSOP suitable for surface mounting.
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.
1
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.
PRODUCTION DATA information is current as of publication date.
Copyright © 2009, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
SN761643
SLES246–APRIL 2009 ..................................................................................................................................................................................................... www.ti.com
TERMINAL FUNCTIONS
TERMINAL
I/O
EQUIVALENT CIRCUIT
DESCRIPTION
NAME
NO.
60
Ω
4
AGC
4
I
Gain control voltage input
100 kΩ
GND1
GND2
8
5
Power amplifier ground
Pre-amplifier ground
–
V
bias
1 kΩ
1 kΩ
2
3
IN1
IN2
2
3
I
AGC amplifier input
OUT1
OUT2
7
6
O
AGC amplifier output
15 Ω
6
7
VCC
1
–
5-V power supply
Correct Use
(See Note A)
Power Amplifier
Pre-amplifier
OUT1
OUT2
IN1
IN2
GND2
GND1
(See Note B)
A. Be careful to keep enough isolation between input and output line.
B. Form a ground pattern as widely as possible. GND1 and GND2 should not have common impedance.
2
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Copyright © 2009, Texas Instruments Incorporated
Product Folder Link(s): SN761643
SN761643
www.ti.com ..................................................................................................................................................................................................... SLES246–APRIL 2009
ABSOLUTE MAXIMUM RATINGS(1)
over operating free-air temperature range (unless otherwise noted)
MIN
–0.4
–0.4
MAX
6.5
UNIT
V
VCC Supply voltage range(2)
VCC (pin 1)
AGC (pin 4)
VI
Input voltage range(2)
VCC
477
150
V
PD
TJC
Continuous total dissipation(3)
mW
°C
Maximum junction temperature
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating
Conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) Voltage values are with respect to the GND of the circuit.
(3) At TA ≤ 25°C. For TA > 25°C, the derating factor is 3.82 mW/°C.
RECOMMENDED OPERATING CONDITIONS
MIN NOM MAX UNIT
VCC
Supply voltage
4.5
5
5.5
85
V
TOPE
Operating free-air temperature
–20
°C
DC ELECTRICAL CHARACTERISTICS
VCC = 5 V, TA = 25°C (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN TYP
MAX UNIT
ICC
Supply current
VAGC = 3 V
28
mA
IIAGC
Input current (AGC)
VAGC = 3 V
30
60
VCC
0.2
µA
V
VAGCMAX AGC maximum gain control voltage
VAGCMIN AGC minimum gain control voltage
Maximum gain
Minimum gain
3
0
V
AC ELECTRICAL CHARACTERISTICS
VCC = 5 V, TA = 25°C, parameters measured in test circuit (unless otherwise noted)
PARAMETER
Maximum gain 1
TEST CONDITIONS
MIN TYP
MAX UNIT
VAGC = 3 V, fIN = 44 MHz, VIN = –60 dBm,
differential out, see Figure 10
GMAX1
GMIN1
GMAX2
GMIN2
57
–7
51
61
–4
55
65
–1
59
–7
dB
dB
dB
dB
VAGC = 0 V, fIN = 44 MHz, VIN = –60 dBm,
differential out, see Figure 10
Minimum gain 1
Maximum gain 2
Minimum gain 2
VAGC = 3 V, fIN = 44 MHz, VIN = –60 dBm, see
Figure 1 and Figure 11
VAGC = 0 V, fIN = 44 MHz, VIN = –60 dBm, see
Figure 1 and Figure 11
–13 –10
GCR
VOUT
NF
Gain control range
Output voltage
Noise figure
VAGC = 0 V to 3 V
65
2.1
11
dB
Vp-p
dB
Single-ended output, see Figure 3
Maximum gain, see Figure 2
fIN1 = 43.5 MHz, fIN2 = 44.5 MHz, Maximum gain,
VOUT = –2 dBm/tone, 1Vp-p
IM3
Third-order intermodulation distortion
–50
dBc
See Figure 5 and Figure 12
IIP3
rIN
Input intercept point
Minimum gain
11
1
dBm
kΩ
Ω
Input resistance (IN1, IN2)
Output resistance (OUT1, OUT2)
rOUT
25
Copyright © 2009, Texas Instruments Incorporated
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Product Folder Link(s): SN761643
SN761643
SLES246–APRIL 2009 ..................................................................................................................................................................................................... www.ti.com
TYPICAL CHARACTERISTICS
35
30
25
20
15
10
5
60
50
40
30
20
10
V
V
V
= 4.5 V
= 5 V
CC
CC
CC
0
= 5.5 V
–10
–20
10
15 20 25 30 35 40 45 50 55 60
Gain (dB)
0.0
0.5
1.0
1.5
AGC (V)
2.0
2.5
3.0
Figure 1. Gain vs AGC (TA = 25°C)
Figure 2. Noise Figure vs Gain (VCC = 5 V, TA = 25°C)
30
60
50
40
30
20
10
0
20
10
0
–10
–20
–30
–40
–50
–60
–70
–80
Maximum gain
Minimum gain
–70 –60 –50 –40 –30 –20 –10
Input Level (dBm)
0
10
10
100
Frequency (MHz)
Figure 3. Output Level vs Input Level (TA = 25°C)
Figure 4. Gain vs Frequency (Gain = Max, TA = 25°C)
10
0
0
–10
–20
–10
–20
–30
–40
–50
–60
–70
–80
–30
–40
42.5 MHz
43.5 MHz
–50
–60
–70
–80
42.5 MHz
43.5 MHz
–90
–100
–110
–120
–35
0
–30 –25 –20 –15 –10 –5
(dBm)
0
5
10 15
10
20
Gain (dB)
Figure 5. IM3 vs Gain (VCC = 5 V, TA = 25°C)
30
40
50
60
V
IN
Figure 6. IM3 (Gain = Min, VCC = 5 V, TA = 25°C)
4
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SN761643
www.ti.com ..................................................................................................................................................................................................... SLES246–APRIL 2009
TYPICAL CHARACTERISTICS (continued)
20
10
0
–10
–20
–30
–40
–50
–60
42.5 MHz
43.5 MHz
–70
–80
–90
–100
–80
–75 –70 –65 –60 –55 –50 –45 –40 –35 –30
(dBm)
V
IN
Figure 7. IM3 (Gain = Max, VCC = 5 V, TA = 25°C)
S-Parameter
20 MHz
70 MHz
20 MHz
70 MHz
Figure 8. IN1
Figure 9. OUT1
Copyright © 2009, Texas Instruments Incorporated
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SN761643
SLES246–APRIL 2009 ..................................................................................................................................................................................................... www.ti.com
APPLICATION INFORMATION
Test Circuits
This application information is advisory, and a performance check is required for actual application circuits.
V
G = 20log(V
v
/V )
OUTdiff IN
CC
47 mF
= 20log(V
/V ) + 6 + 14
OUT IN
0.1 mF
1
V
GND1
OUT1
OUT2
GND2
8
7
6
5
CC
Spectrum
Analyzer
SG
m
0.1
F
50 Ω
200 Ω
0.1 mF
0.1 mF
2
IN1
0.1 mF
V
OUTdiff
V
50 W
V
3
4
IN2
IN
50 Ω
OUT
AGC
250 W
0.1 mF
Figure 10. Measurement Circuit for Gain and Output Voltage 1
V
CC
G = 20log(V
/V ) + 14
OUT IN
47 mF
v
0.1 mF
1
V
GND1
OUT1
OUT2
GND2
8
7
6
5
CC
Spectrum
Analyzer
SG
m
0.1
F
50 Ω
200 Ω
0.1 mF
0.1 mF
2
IN1
0.1 mF
50 Ω
V
3
4
IN2
IN
50 Ω
V
OUT
AGC
250 W
0.1 mF
Figure 11. Measurement Circuit for Gain and Output Voltage 2
SG1
V
50 Ω
CC
47 mF
0.1 mF
1
V
GND1
OUT1
OUT2
GND2
8
7
6
5
CC
Spectrum
Analyzer
m
0.1
F
200 Ω
0.1 mF
0.1 mF
+
2
IN1
0.1 mF
50 Ω
SG2
3
4
IN2
50 Ω
50 Ω
AGC
250Ω
0.1 mF
Figure 12. Measurement Circuit for IM3 and IIP3
6
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Copyright © 2009, Texas Instruments Incorporated
Product Folder Link(s): SN761643
PACKAGE MATERIALS INFORMATION
www.ti.com
16-Aug-2012
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device
Package Package Pins
Type Drawing
SPQ
Reel
Reel
A0
B0
K0
P1
W
Pin1
Diameter Width (mm) (mm) (mm) (mm) (mm) Quadrant
(mm) W1 (mm)
SN761643DGKR
VSSOP
DGK
8
2500
330.0
12.4
5.3
3.4
1.4
8.0
12.0
Q1
Pack Materials-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
16-Aug-2012
*All dimensions are nominal
Device
Package Type Package Drawing Pins
VSSOP DGK
SPQ
Length (mm) Width (mm) Height (mm)
367.0 367.0 35.0
SN761643DGKR
8
2500
Pack Materials-Page 2
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