1
Preliminary Information
SL1914
SL1914
Satellite Tuner Front End LNA with AGC
Preliminary Information
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.
.
Features
q
Single chip solution for satellite tuner LNA and
AGC
q
Provides for 30 dB minimum AGC
q
Low DSB NF at maximum gain
q
High signal handling at minimum gain
q
Provides differential output drive
q
ESD protection (Normal ESD handling
procedures should
be observed)
Applications
q
Satellite receiver systems
q
Data communications systems
q
Master Antennae Distribution Systems
DS5137
Issue no 1.6
April 1999
Ordering Information
SL1914A/KG/MP1S
SL1914A/KG/MP1T
Figure 1 Block Diagram
RE INPUT
AGC
OUTPUT
OUTPUTB
Vcca
Vccb
Vee
2
4
6
5
1
8
3
2
SL1914
Preliminary Information
Figure 2 Pin Connections
MP8
8
SPOT
REF
.
Vcca
RFIP
Vee
AGC
Vccb
N/C
OP
OPB
Quick Reference Data
Characteristic
Units
Operating frequency
950 - 2150
MHz
Input DSB NF at max gain
8
dB
Maximum conversion gain
20
dB
Minimum conversion gain
-10
dB
IPIP3
2T
117
dB
V
IPIP2
2T
127
dB
V
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.
3
Preliminary Information
SL1914
Electrical Characteristics
Tamb= -20
o
C to +70
o
C, Vee= 0V, Vcc = 5V
5%, 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
Value
Units
Conditions
Min
Typ
Max
Supply current
1, 8
110
150
mA
AGC = 4V
Operating range
950
2150
MHz
Input impedance
2
75
IF input return loss
2
8
dB
Input DSB NF
2
7
9
dB
Maximum gain, AGC = 1V
Variation in NF with gain
-1
dB/dB
setting
Conversion gain
Differential power gain into 75
minimum
-10
dB
Vagc = 4V See note 1.
maximum
21
dB
Vagc = 1V
dB
AGC monotonic from Vee to Vcc
Gain variation within
+0.5
dB
Maximum channel bandwidth of
channel
54MHz, within range 950 -
2150MHz
Input referred 1 dB gain
2
107
dB
V
Minimum specified gain setting
compression
Input referred IP3
2
117
dB
V
Minimum specified gain setting,
two tones at 99dB
V
Input referred IP2
2
125
dB
V
Minimum specified gain setting,
two tones at 99dB
V
Variation in second and
-1
dB/dB
third order intermodulation
intercept points with gain
setting
AGC control slope
4
4:1
variation
AGC control input current
4
350
A
Output impedance
5, 6
75
Output return loss
5, 6
6
dB
Note 1: The AGC voltage should not exceed 4V.
4
SL1914
Preliminary Information
Absolute Maximum Ratings
All voltages referred to Vee at 0V.
Characteristics
Min
Max
Unit
Conditions
Supply voltage
-0.3
7
V
IFIN and IFINB input voltage
117
dB
V
Transient condition only
All I/O port DC offset
-0.3
VCC+0.3
V
Except AGC (pin 4)
AGC input DC offset
-0.3
4
V
Storage temperature
-55
150
C
Junction temperature
150
C
Package thermal resistance,
39.8
C/W
chip to case
Package thermal resistance,
120
C/W
chip to ambient
Power consumption at 5.25V
790
mW
ESD protection
2
kV
Mil std-883 latest revision
method 3015 class 1
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