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PDF NP2T Data sheet ( Hoja de datos )
| Número de pieza | NP2T | |
| Descripción | Satellite Zero IF QPSK Tuner IC | |
| Fabricantes | Mitel Networks Corporation | |
| Logotipo |  |
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Features
q Single chip system for direct quadrature down
conversion from L-band
q High signal handling capability for minimum
external component count application, requires
external RF AGC of 30dB
q Compatible with DSS and DVB system
requirements
q Excellent gain and phase match up to 30MHz
baseband
q High output referred linearity for low distortion and
multi channel application
q Fully balanced low radiation design
q Integral RF AGC amplifier
q Two selectable varactor tuned local oscillators
with buffered output for driving external
synthesiser loop
q ESD protection (Normal ESD handling procedures
should be observed)
Applications
q Satellite receiver systems
q Data communications systems
SL1925
Satellite Zero IF QPSK Tuner IC
Preliminary Information
DS4955
Issue - 2.0
March 1999
Ordering Information
SL1925/KG/NP2S (Tubes)
SL1925/KG/NP2T (Tape and Reel)
Description
The SL1925 is a wideband quadrature converter operating
from 950 to 2150 MHz, intended primarily for application
in satellite tuners.
The device contains all elements necessary, with the
exception of local oscillator sustaining network, to fabricate
a high performance I(n-phase) & Q(uadrature) phase
splitter and downconverter optimised for systems
containing RF AGC gain control. The device allows for
systems containing higher power analog interferers. For
most applications RF tunable filtering is not essential.
The SL1925 is optimised for use with a low phase noise
synthesiser, a range of which are available from Mitel
Semiconductor. This will form a complete front end tuner
function for digital satellite receiver systems utilising DSP
derotation recovery.
The device includes a very high signal handling front end
with AGC, this provides for gain control, reference local
oscillator with output buffer, phase splitter with I and Q
mixers and baseband buffer amplifiers with external
interstage filtering.
1 page  
Preliminary Information
SL1925
50.0
40.0
30.0
30dB minimum, AGC <1V
20.0
10.0
0.0
-10.0
-5dB maximum, AGC >4V
-20.0
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
AGC control voltage (V)
Figure 6 Converter gain variation with AGC voltage (typical)
120
115
110
105
100
95
90
-6 -1 4
9 14 19 24 29
Converter gain setting (dB)
Figure 7 Converter input referred IP3 variation with gain setting (typical)
34
5
5 Page 
Preliminary Information
SL1925
IPFI
and
IPFQ
BIAS
Iout
and
Qout
Baseband amplifier inputs (pins 16,27)
Baseband outputs (pins 18, 25)
Figure 15b Input/Output interface circuits (continued)
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet NP2T.PDF ] | |
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