SL1461 Mitel Networks Corporation, SL1461 Datasheet
SL1461
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SL1461 Summary of contents
Page 1
... The SL1461SA is a wideband PLL FM demodulator, intended primarily for application in satellite tuners. The device contains all elements necessary, with the exception of external oscillator sustaining network and loop feedback components, to form a complete PLL system operating at frequencies up to 800MHz. An AFC with window adjust is provided, whose output signal can be used to correct for any frequency drift at the head end local oscillator ...
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... SL1461SA ELECTRICAL CHARACTERISTICS +4.5V to +5.5V. The electrical characteristics are guaranteed by either production test or design. amb CC They apply within the specified ambient temperature and supply voltage unless otherwise stated. Characteristics Supply current Operating frequency Input sensitivity Input overload VCO sensitivity (dF/dV) ...
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... BASE BAND VIDEO 1V p–p TV SAT TEST TX ROHDE & SCHWARZ SFZ RF CARRIER FREQ 479.5MHz FM MODULATION 13.5MHz P–P PRE–EMPHASISED VIDEO SL1461 TEST APPLICATION BOARD MONTFORD See Fig. 3 for details TEST OVEN PRE EMPHASISED BASE BAND VIDEO VIDEO AMPLIFIER/ DE EMPHASISED NETWORK VIDEO ANALYSER ROHDE & ...
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... AGC signal that can be used for controlling the gain of the IF amplifier stages, so maintaining a fixed level to the RF input of the SL1461SA, for optimum threshold performance. The bias point of the AGC circuit can be adjusted to cater for variation in AGC line voltage requirement and device input power ...
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... DESIGN OF PLL LOOP PARAMETERS RF INPUT The SL1461SA is normally used as a type 1 second order loop and can be represented by the above diagram. For such a system the following parameters apply and AFC FACILITY The SL1461SA contains an analog frequency error detect circuit, which generates DC voltage proportional to the integral of frequency error ...
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... SL1461SA BASEBAND VIDEO 6 WINDOW ADJUST ALIGN V LO FREQ – + – Fig.5 AFC system block diagram EXT C EXT V AFC ...
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... REF; 2.7V AGC OUTPUT AGC output V REF; 3V 2x1500 RF INPUTS RF inputs V CC AFC PUMP 10K AFC OUTPUT AFC output stage Fig.6 SL1461SA I/O port internal circuitry SL1461SA AGC BIAS V REF; 2V AGC bias adjust AFC WINDOW V REF; 1.6V AFC window adjust VIDEO + VIDEO – 330 330 ...
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... SL1461SA FROM PHASE DETECTOR 2x570 VIDEO FEEDBACK + VIDEO FEEDBACK – Video amp feedback inputs 8 V REF; 1. OSCILLATOR + OSCILLATOR – Local oscillator Fig.6a SL1461SA I/O port internal circuitry FREQ MHz 520 500 480 460 440 420 400 360 1 1.5 2 2.5 3 3.5 DC VOLTAGE Fig.7 Typical VCO frequency vs DC control voltage ...
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... OUTPUT 1.0 VOLTAGE 0.5 –70 Fig.9 SL1461SA AGC output voltage for differing values of AGC bias resistor APPLICATION NOTES Capture range Under conditions when there input signal present, the SL1461SA may react to spurious radiation from the free running oscillator coupling into the RF inputs. Because of the ...
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... S-curve. When the oscillator is sitting in the centre of the S-curve, the two video outputs will be at the same DC voltage. RF oscillator design The standard application circuit for the SL1461SA is shown in Fig.3 The layout of the VCO tank should follow normal good RF techniques - ie as compact as possible. This will minimise parasitics, thus giving improved VCO linearity and stability ...
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... Fig.10 Layout of demo board with component locations SL1461SA 11 ...
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... SL1461SA PACKAGE DETAILS Dimensions are shown thus: mm (in). 9·80/10·01 (0·386/0·394) 16 SPOT REF. CHAMFER REF. PIN 1 0·33/0·51 (0·013/0·020) 0·69 (0·027) MAX 16 LEADS AT 1·27 (0·050) NOM SPACING 16-LEAD MINIATURE PLASTIC DIL - MP16 CUSTOMER SERVICE CENTRES FRANCE & BENELUX Les Ulis Cedex ...