SL521CCM [ZARLINK]
150MHz WIDEBAND LOG AMPLIFIER; 150MHz的WIDEBAND对数放大器
| 型号： | SL521CCM |
| 厂家： | 
ZARLINK SEMICONDUCTOR INC |
| 描述： | 150MHz WIDEBAND LOG AMPLIFIER |
| 文件： | 总7页 (文件大小：328K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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THIS DOCUMENT IS FOR MAINTENANCE
PURPOSES ONLY AND IS NOT
RECOMMENDED FOR NEW DESIGNS
ADVANCE INFORMATION
DS3606 - 2.0
SL521
150MHz WIDEBAND LOG AMPLIFIER
The SL521A, B and C are bipolar monolithic Integrated
circuit wideband amplifiers, intended primarily for use in
successive detection logarithmic IF strips, operating at centre
frequencies between 10MHz and 100MHz The devices
provide amplification, limiting and rectification, are suitable for
direct coupling and incorporate supply line decoupling The
mid-band voltage gain of the SL521 is typically12dB(4times)
The SL521A, B and C differ mainly in the tolerance of voltage
gain and upper cut-off frequency
The device is also available as the 5962-90792 which has
guaranteed operation over the full Military Temperature
Range and is screened to MIL-STD-883 Class B. Data is
available separately
CM8
Fig.1 Pin connections - bottom view
FEATURES
ABSOLUTE MAXIMUM RATINGS
(Non-simultaneous)
■ Wide Defined Gain
■ 4dB Noise Figure
■ Hlgh I/P impedance
■ Low O/Pi mpedance
■ 165MHz Bandwidth
■ On Chip Supply Decoupling
■ Low External Component Count
Storage temperature range
Operating temperature range
Chip operating temperature
Chip-to-ambient thermal resistance
Chip-to-case thermal resistance
Maximum instantaneous voltage at
Video output
-65°C to +150°C
-55°C to +125°C
+175°C
225°C/W
65°C/W
+12V
+9V
Supply voltage
ORDERING INFORMATION
APPLICATIONS
SL521 A CM
SL521 B CM
5962-90792 (SMD)
SL521 C CM
■ Logarithmic IF Strips wlth Gains up to 108dB and
Linearity better than 1dB
Fig.2 Circuit diagram SL521
SL521
ELECTRICAL CHARACTERISTICS
These characteristics are guaranteed over the following conditions (unless otherwise stated)
Temperature = +22°C + 2°C
Supply voltage = +6V
DC connection between input and bias pins.
Value
Characteristic
Circuits
Units
Conditions
Min. Typ. Max.
Voltage gain, f = 30MHz
A
B
C
A
B
C
11.5
11 .3
11.0
11.3
11.0
12.5
1 2.7
13.0
12.7
13.0
13.3
dB
dB
dB
dB
dB
10 ohms source, 8pF load
Voltage gain, f = 60MHz
10.7
dB
Upper cut-off frequency (Fig. 3)
A
B
C
A B C
A B C
A
B
C
150 170
140 170
130 170
5
MHz
MHz
MHz
MHz
ns
mA
mA
mA
db/V
%/V
10 ohms source, 8pF load
10 ohms source, 8pF load
Lower cut-off frequency (Fig. 3)
Propagation delay
Maximum rectified video output
current (Fig. 4 and 5)
7
2
1.00
0.95
0.90
1.10
1.15
1.20
f = 60MHz, 0.5V rms input
Variation of gain with supply voltage
Variation of maximum rectified
output current with supply voltage
Maximum input signal before overload
Noise figure (Fig. 6)
A B C
A B C
0.7
25
A B C
1.8
1.9
4
V rms
dB
See note below
f = 60MHz, Rs = 450 ohms
5.25
Supply current
A
B
C
12.5 15.0 18.0
12.5 15.0 18.0
11.5 15.0 19.0
mA
mA
mA
Maxiumum RF output voltage
1.2
Vp-p
Note: Overload occurs when the input signal reaches a level sufficient to forward bias the base-collector junction to TR2 on peaks.
Fig.4 Rectified output current v. input signal (typical)
Fig.3 Voltage gain v. frequency (typical)
SL521
Fig.6 Noise figure v. temperature (typical)
Fig.5 Maximum rectified output current v. temperature
(typical)
OPERATING NOTES
The amplifiers are intended for use directly coupled, as
shown in Fig 8.
Fig.7 Input admittance with open-circuit output (typical)
The seventh stage in an untuned cascade will be giving
virtually full output on noise.
Noise may be reduced by inserting a single tuned circuit in
the chain As there is a large mismatch between stages a
simple shunt or series circuit cannot be used The choice of
network is also controlled by the need to avoid distorting the
logarithmiclaw;thenetworkmustgiveunityvoltagetransferat
resonance A suitable network is shown in Fig 9. The value of
C1mustbechosensothatatresonanceitsadmittanceequals
thetotallossconductanceacrossthetunedcircuitResistorR1
may be introduced to improve the symmetry of filter response,
providing other values are adjusted for unity galn at
resonance.
A simple capacitor may not be suitable for decoupling the
output line if many stages and fast rise times are required.
Alternative arrangements may be derived, based on the
Fig.8 Direct Coupled amplifiers
parasitic parameters given.
Values of positive supply line decoupling capacitor
requlred for untuned cascades are given below. Smaller
values can be used in high frequency tuned cascades.
Number of stages
6 or more
5
4
3
Minimum capacitance
30nF
10nF 3nF lnF
Fig.9 Suitable interstagetuned circuit
The amplifiers have been provided with two earth leads to
avoid the introduction of common ground lead inductance
between input and output circuits. The equipment designer
should take care to avoid the subsequent introduction of such
inductance.
The 500pF supply decoupling capacitor has a resistance
of, typically, 1 0Q. It is a junction type having a low breakdown
voltage and consequently the positive supply current will
increase rapidly if the supply voltage exceeds 7.5V (see
Absolute Maximum Ratings).
SL521
Parasitic Feedback Parameters (Approximate)
The quotation of these parameters does not indicate that
elaborate decoupling arrangements are required, the
amplifier has been designed specifically to avoid this
requirement. The parameters have been given so that the
necessity or otherwise of further decoupling, may become a
matter of calculation rather than guesswork.
Voltage induced at pin 6
Voltage at pin 2
V6
V2
=
= 0.03 (f = 10MHz)
a
Voltage at pin 2
(pin joined to pin 7 and
fed from 300Ω source)
Voltage induced at pin 6
Voltage at pin 2
b
V6
V2
~
=
= 0.01 (f = 10MHz)
RF current component from pin 4
Voltage at pin 6
I4
=
= 20 mmhos
V6
Voltage at pin 2
(This figure allows for detector being forward biased by
noise signals).
(pin 7 decoupled)
V6
V2
I2
V6
V6
V2
decrease with frequency above 10MHz
at 6dB/octave
a
Effective voltage induced at pin 6
V4
b
=
= 0.003
Voltage at pin 4
V6
Current from pin 2
Voltage at pin 6
I2
=
= 6 mmhos (f = 10MHz)
V6
HEADQUARTERS OPERATIONS
CUSTOMER SERVICE CENTRES
GEC PLESSEY SEMICONDUCTORS
Cheney Manor, Swindon,
Wiltshire SN2 2QW, United Kingdom.
Tel: (0793) 518000
• FRANCE & BENELUX Les Ulis Cedex Tel: (1) 64 46 23 45 Fax : (1) 64 46 06 07
• GERMANY Munich Tel: (089) 3609 06-0 Fax : (089) 3609 06-55
• ITALY Milan Tel: (02) 66040867 Fax: (02) 66040993
• JAPAN Tokyo Tel: (03) 5276-5501 Fax: (03) 5276-5510
Fax: (0793) 518411
• NORTH AMERICA Scotts Valley, USA Tel (408) 438 2900 Fax: (408) 438 7023.
• SOUTH EAST ASIA Singapore Tel: (65) 3827708 Fax: (65) 3828872
• SWEDEN Stockholm, Tel: 46 8 702 97 70 Fax: 46 8 640 47 36
• UK, EIRE, DENMARK, FINLAND & NORWAY
GEC PLESSEY SEMICONDUCTORS
P.O. Box 660017
1500 Green Hills Road,
Swindon Tel: (0793) 518510 Fax : (0793) 518582
Scotts Valley, California 95067-0017,
United States of America.
Tel: (408) 438 2900
These are supported by Agents and Distributors in major countries world-wide.
GEC Plessey Semiconductors 1994
Fax: (408) 438 5576
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capability, performance or suitability of any product or service. Information concerning possible methods of use is provided as a guide only and does not constitute
any guarantee that such methods of use will be satisfactory in a specific piece of equipment. It is the user’s responsibility to fully determine the performance and
suitability of any equipment using such information and to ensure that any publication or data used is up to date and has not been superseded. Manufacturing does
not necessarily include testing of all functions or parameters. These products are not suitable for use in any medical products whose failure to perform may result in
significant injury or death to the user. All products and materials are sold and services provided subject to Zarlink’s conditions of sale which are available on request.
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