MC33411BFTA View Datasheet(PDF) - Motorola => Freescale
Part Name
Description
Manufacturer
MC33411BFTA Datasheet PDF : 43 Pages
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15, 16
Fref In,
Fref Out
Tx PLL
VCC
Reference Frequency Input for various portions of
the circuit, including the PLLs, SCF clock, etc.
A crystal (4 to 18.25 MHz) may be connected as
shown, or an external frequency source may be
capacitor coupled to Pin 15. See text for crystal
100
Fref Out
requirements.
16
1) For the MC33411A the Fref Out can be disabled
via the MCU interface.
Tx PLL
VCC
2) For the MC33411B this output is always active
(on).
100
Disable
15
Fref In
17
DS Out
(Output)
VCC
Audio
100 k
VCC
Audio
17
DS Out
Data Slicer Output (open collector with internal
100 kΩ pull–up resistor).
18
Tx Out
(Output)
20
C Out
(Output)
19
Lim In
(Input)
VB
VCC
Audio
19
Lim In
400 k
VCC
Audio
18, 20
Tx Out,
C Out
Tx Out is the Tx path audio output. Internally this
pin has a low–pass filter circuitry with –3.0 dB
bandwidth of 4.0 kHz. Tx gain and mute are
programmable through the MCU interface. This pin
is sensitive to load capacitance.
C Out is the compressor output.
Lim In is the limiter input. This pin is internally
biased and has an input impedance of 400 kΩ.
Lim In must be ac–coupled.
VB
21
Ccap
VCC
Audio
VCC
Audio
40 k
21
Ccap
Ccap is the compressor rectifier filter capacitor pin. It
is recommended that an external filter capacitor to
VCC audio be used. A practical capacitor range is
0.1 to 1.0 µF. The recommended value is 0.47 µF.
NOTE: 1. All VCC pins must be within ±0.5 V of each other.
MOTOROLA RF/IF DEVICE DATA
11
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