mc33411a Freescale Semiconductor, Inc, mc33411a Datasheet - Page 25

• Manufacturer Part Number: mc33411a
• Description: 900 Mhz Analog Cordless Phone Baseband With Compander
• Manufacturer: Freescale Semiconductor, Inc

Power Amplifiers
drive the earpiece in a handset, or the telephone line via a
hybrid circuit in the base unit. Each output (PAO+ and PAO–)
can source and sink 5.0 mA, and can swing 1.3 V pp each. For
high impedance loads, each output can swing 2.7 V pp (5.4
V pp differential). The gain of the amplifiers is set with a
feedback resistor from Pin 30 to 32, and an input resistor at
Pin 32. The differential gain is 2x the resistor ratio. Capacitors
MOTOROLA RF/IF DEVICE DATA
The power amplifiers (Pins 29, 30, 32) are designed to
3.2
2.8
2.4
2.0
1.6
1.2
0.8
0.4
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0
2.5
0
0.4
T A = 25 C
Maximum Output Swing versus V CC
3.0
0.8
Figure 32. Power Amplifier
Figure 34. Power Amplifier
Maximum Output Swing
1.2
3.5
1.6
PAI (V pp )
2.0
V CC (V)
4.0
2.4
2.8
4.5
V CC = 3.6 V
T A = 25 C
3.2
Open
130 Ω
130 Ω
Open
3.6
5.0
4.0
MC33411A/B
4.4
5.5
can be used for frequency shaping. The pins’ dc level is VB
(≅1.5 V).
of muting with a 50 kΩ feedback resistor. The amount of
muting will depend on the value of the feedback resistor.
swing/distortion for V CC = 3.6 V, and Figure 34 illustrates the
maximum swing capability for various value of V CC .
The Mute switch, controlled with bit 6/0, will provide 60 dB
F i g u r e s 32 a n d 33 s h o w t h e p o w e r a m p l i f i e r
5.0
20
15
10
0
0
0.4
V CC = 3.6 V
T A = 25 C
0.8
Figure 33. Power Amplifier
1.2
1.6
Distortion
2.0
PAI (V pp )
2.4
2.8
130 Ω
3.2
Open
3.6
4.0
25
4.4