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Preliminary Information
SL1914
SL1914
Satellite Tuner Front End LNA with AGC Preliminary Information
DS5137 Issue no 1.6 April 1999
Features Ordering Information
q
q q q q q
Single chip solution for satellite tuner LNA and AGC Provides for 30 dB minimum AGC Low DSB NF at maximum gain High signal handling at minimum gain Provides differential output drive ESD protection (Normal ESD handling procedures should be observed)
SL1914A/KG/MP1S SL1914A/KG/MP1T
Description
The SL1914 is a wideband LNA with AGC designed primarily for application in satellite tuner front ends, offering high signal handling capability with low noise figure compatible with most common tuner input requirements. The SL1914 is optimised to complement the SL1925, ZIF quadrature downconverter, integrating all the active RF circuitry within the tuner, in a highly compact, efficient solution, and offering a full 1-45 MS/s tuner capability.
Applications
q q q
Satellite receiver systems Data communications systems Master Antennae Distribution Systems
.
6 RE INPUT 2 5
OUTPUT OUTPUTB
AGC
4
1 8 3
Vcca Vccb Vee
Figure 1 Block Diagram
1
SL1914
Preliminary Information
Vcca RFIP
Vccb N/C
8 SPOT REF.
Vee AGC
OP OPB
MP8
Figure 2 Pin Connections
Quick Reference Data Characteristic
Operating frequency Input DSB NF at max gain Maximum conversion gain Minimum conversion gain IPIP32T IPIP22T 950 - 2150 8 20 -10 117 127
Units
MHz dB dB dB dBV dBV
Functional Description
The SL1914 is a bipolar, low noise AGC amplifier designed primarily for application in satellite tuner front ends. It contains a low noise input amplifier, an AGC stage with a minimum of 30dB of gain control and a 75 Ohm output drive. It replaces all active circuitry in conventional architectures. .
The typical key performance numbers under nominal load ambient and supply conditions are contained in table headed Quick Reference Data.
2
Preliminary Information
Electrical Characteristics
SL1914
o o Tamb= -20 C to +70 C, Vee= 0V, Vcc = 5V5%, These characteristics are guaranteed by either production test or design. They apply within the specified ambient temperature and supply voltage unless otherwise stated.
Characteristic
Pin
Min
Value
Typ 110 950 75 8 7 9 -1 Max 150 2150
Units
Conditions
Supply current Operating range Input impedance IF input return loss Input DSB NF Variation in NF with gain setting Conversion gain minimum maximum Gain variation within channel Input referred 1 dB gain compression Input referred IP3 Input referred IP2 Variation in second and third order intermodulation intercept points with gain setting AGC control slope variation AGC control input current Output impedance Output return loss
1, 8 2 2 2
mA MHz dB dB dB/dB
AGC = 4V
Maximum gain, AGC = 1V
-10 21 +0.5
dB dB dB dB
2 2 2
107 117 125 -1
dBV dBV dBV dB/dB
Differential power gain into 75 Vagc = 4V See note 1. Vagc = 1V AGC monotonic from Vee to Vcc Maximum channel bandwidth of 54MHz, within range 950 2150MHz Minimum specified gain setting Minimum specified gain setting, two tones at 99dBV Minimum specified gain setting, two tones at 99dBV
4 4 5, 6 5, 6
4:1 350 75 6 A dB
Note 1: The AGC voltage should not exceed 4V.
3
SL1914
Absolute Maximum Ratings
All voltages referred to Vee at 0V. Characteristics Supply voltage IFIN and IFINB input voltage All I/O port DC offset AGC input DC offset Storage temperature Junction temperature Package thermal resistance, chip to case Package thermal resistance, chip to ambient Power consumption at 5.25V ESD protection Min -0.3 -0.3 -0.3 -55 Max 7 117 VCC+0.3 4 150 150 39.8 120 790 2 Unit V dBV V V C C C/W C/W mW kV
Preliminary Information
Conditions Transient condition only Except AGC (pin 4)
Mil std-883 latest revision method 3015 class 1
4
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