MC44S803EP FREESCALE [Freescale Semiconductor, Inc], MC44S803EP Datasheet - Page 2

• Manufacturer Part Number: MC44S803EP
• Description: Low Power CMOS Broadband Tuner
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

modems, cable TV (CATV) set-top boxes (analog & digital),
computer TV tuner cards (analog & digital), analog TV sets,
input frequency range is 48 MHz to 1 GHz. RF signal
reception from 861 MHz to 1 GHz is supported with reduced
performance. The RF input signal enters the Low Noise
Amplifier (LNA) after passing though the external diplex filter.
The signal is then up converted to 1086 MHz (1086 MHz is
an example frequency, not a limitation or recommendation)
and passed through the first IF filter. This first IF SAW can be
replaced with a lower cost filter (determined by application).
The filtered signal is then routed back onto the chip where it
is down converted to the second IF center frequency. This is
fed to the second IF channel filter. The signal enters the IC
again to go through the second IF variable gain output
amplifier that gets an analog AGC control voltage from the
demodulator.
This provides support for systems with multiple demodulators
(e.g. one digital demodulator and one analog TV
demodulator).
to balance the gain budget for a given application. Amplifier
MC44S803
2
Typical applications for the MC44S803 include cable data
Figure 2 shows the major sections of the MC44S803. The
The output can be switched between two output ports.
Many of the amplifiers in the IC have programmable gain
Oscillator
RF AGC0
RF AGC1
External
RF Input
Loop
Filter
Buffer
59
19
21
20
58
61
22
50
51
62
Amplifier
48 – 1000 MHz
Pump 1
Diff
Charge
4 to 28 MHz
LNA
Amplifier 1
Detector
Shut Dn
Pre
VCO
VCO
VCO
Phase
Figure 2. Generation 3 CMOS Silicon Tuner IC Block Diagram
LPF
Gain Select
1
Divide
by R3
Divide
Digital
by N1
AGC
Mixer 1
1077 to 2150 MHz
1086 MHz Nominal 1st IF
OSC
53
Detector
MISO/Addr 2
SS/Addr 1
Power
Divide
by R1
54
Input
BPF
SCLK
44
17
Amplifier 2
OVERVIEW
45
Data Registers
Pre
14
SPI / I
Interface
13
2
C Bus
digital terrestrial TV sets, digital terrestrial adapters, home
DVD-R and DVR/PVR.
gains are typically set as part of the initialization sequence at
power up, then do not need to be changed after that. All
programming and configuration control is accomplished via
an industry standard I
16 15
Mixer 2
Quadrature
Generator
Additional features of the MC44S803 include:
• 3.3 V ±5% single supply operation
• Internal 1.8 V tracking regulator
• High linearity and reduced current
• Reduced gain roll off at high frequencies
• 40 dB gain control range in LNA, digitally or analog
• 36 dB gain control range in IF, analog voltage
• Ability to switch between two control voltages for use
• Fully integrated VCO varactors (only one VCO inductor
• Reference crystal frequency range from 4.0 to 28 MHz
MOSI/SDA
voltage controlled.
controlled.
with digital and analog demodulators
required)
BusSelect
1042 MHz Nominal
250/125/62.5 kHz
Silicon Tuner IC
Divide
by N2
MC44S803
Freescale
LPF
Amplifier 2
Detector
Phase
Divide
by R2
VCO
Post
2
C or SPI interface bus.
2
41
30 – 60 MHz 2nd IF
Regulator
42
Pump 2
Charge
BPF
1.8 V
28
Freescale Semiconductor
29
31
24
23
26
25
33
34
2
3
External
AGC Control
To Digital
Demodulator
To Analog
Demodulator
Loop
Filter
3.3 V