Datasheet
MC33411A/B
11
MOTOROLA RF/IF DEVICE DATA
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PIN FUNCTION DESCRIPTION (continued)
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Description
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Description
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Symbol/Type
ÁÁÁÁ
ÁÁÁÁ
Pin
15, 16 F
ref
In,
F
ref
Out
16
F
ref
Out
F
ref
In
15
100
100
Tx PLL
V
CC
Tx PLL
V
CC
Disable
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
requirements.
1) For the MC33411A the F
ref
Out can be disabled
via the MCU interface.
2) For the MC33411B this output is always active
(on).
17 DS Out
(Output)
DS Out
17
V
CC
Audio
V
CC
Audio
100 k
Data Slicer Output (open collector with internal
100 kΩ pull–up resistor).
18 Tx Out
(Output)
,
18, 20
V
CC
Audio
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.
20 C Out
(Output)
Tx Out
,
C Out
V
B
C Out is the compressor output.
19 Lim In
(Input)
Lim In
19
V
CC
Audio
400 k
V
B
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.
21 C
cap
C
cap
21
V
CC
Audio
V
CC
Audio
40 k
C
cap
is the compressor rectifier filter capacitor pin. It
is recommended that an external filter capacitor to
V
CC
audio be used. A practical capacitor range is
0.1 to 1.0 µF. The recommended value is 0.47 µF.
NOTE: 1. All V
CC
pins must be within ±0.5 V of each other.
ARCHIVE INFORMATION
ARCHIVE INFORMATION
Fr
eescale S
emiconduct
or
, I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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