MC33411B Motorola, MC33411B Datasheet - Page 11

• Manufacturer Part Number: MC33411B
• Description: (MC33411A/B) ANALOG CORDLESS PHONE BASEBAND
• Manufacturer: Motorola

NOTE: 1. All V CC pins must be within 0.5 V of each other.
MOTOROLA RF/IF DEVICE DATA
15, 16
Pin
17
18
20
19
21
Symbol/Type
F ref Out
(Output)
(Output)
(Output)
DS Out
F ref In,
Tx Out
(Input)
C Out
Lim In
C cap
Lim In
C cap
19
21
Audio
V CC
Tx PLL
V CC
Audio
V CC
PIN FUNCTION DESCRIPTION
Disable
400 k
Audio
V CC
Description
V B
V B
40 k
100 k
Audio
V CC
MC33411A/B
100
100
Tx PLL
Audio
Audio
V CC
V CC
V CC
F ref Out
16
15
F ref In
17
DS Out
18, 20
Tx Out,
C Out
,
(continued)
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).
Data Slicer Output (open collector with internal
100 k pull–up resistor).
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 k .
Lim In must be ac–coupled.
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 F. The recommended value is 0.47 F.
Description
11