PRELIMINARY INFORMATION
SEPTEMBER 1993
D.S. 3754 1.6
SL1461
WIDEBAND PLL FM DEMODULATOR
The SL1461 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.
FEATURES
J Single chip PLL system for wideband FM
demodulation
J Simple low component count application
J Allows for application of threshold extension
J Fully balanced low radiation design
J High operating input sensitivity
J AGC detect and bias adjust
J 75W video output drive with low distortion
levels
J Dynamic self biasing analog AFC
J Full ESD protection *
* Normal ESD handling procedures should be observed
16
116
89
2
4
3
5
6
7
10
11
12
13
14
15
AFC PUMP
AFC WINDOW ADJUST
VEE
OSCILLATOR +
OSCILLATOR –
AGC BIAS
AGC OUTPUT
RF INPUT
AFC OUTPUT
VCC
VIDEO FEEDBACK +
VIDEO –
VIDEO +
VIDEO FEEDBACK –
VIDEO OUTPUT
RF INPUT
MP16
Fig. 1 Pin connections top view
APPLICATIONS
J Satellite receiver systems
J Data communications systems
ORDERING INFORMATION
SL1461S/KG/MPAS
AGC BIAS
RF INPUTS
AGC OUTPUT
LOCAL
OSCILLATOR
AFC WINDOW
ADJUST
VIDEO
FEEDBACK +
VIDEO +
VIDEO –
FEEDBACK –
VIDEO
OUTPUT
AFC PUMP
AFC OUTPUT
Fig. 2 SL1461 block diagram
VIDEO
16
6
8
9
7
4
5
2
14
12
13
11
10
1