mc33411a Freescale Semiconductor, Inc, mc33411a Datasheet - Page 21

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

Data Slicer
the RF receiver section at Pin 39. The input signal to the data
slicer must be >200 mVpp. Hysteresis of 40 mV is internally
provided. The output of the data slicer will be same
waveform, but with an amplitude of 0 to V CC , and can be
observed at Pin 17 if bits 5/9–8 are set to 00. The output can
be inverted by setting bit 5/9 = 1. The data slicer can be
disabled by setting bit 5/8 = 1.
Receive Audio Path
anti–aliasing filter, a low–pass filter, side tone attenuator, gain
adjust stage, a mute switch, expander and volume control.
with a corner frequency at 3.8 kHz. This is designed to
provide bandwidth limiting in the audio range.
–5.0
–10
–15
–20
–25
–30
–35
–40
Gain Control
MOTOROLA RF/IF DEVICE DATA
–60
0
The data slicer will receive the low level digital signal from
The Receive Audio Path (Pins 38, 36–33) consists of an
The switched capacitor low–pass filter is an 8 pole filter,
Bit #4
Attenuate Bit #1
–
0
0
0
0
0
0
0
0
Side Tone
V CC = 3.6 V
T A = 25 C
Figure 21. Tx Output Audio Response
–50
0
0
1
1
Gain Control
–40
Tx Out
Bit #3
(Lim off, R6/11 = 1)
–
0
0
1
1
1
1
1
1
MCI VOLTAGE (dBV)
–30
Attenuate Bit #0
Distortion
Gain Control
–20
Side Tone
Bit #2
0
1
0
1
Table 3. Rx Gain Adjust Programming (Register 7)
–
1
1
0
0
0
0
1
1
–10
Table 2. Side Tone Attenuate Programming
Gain Control
0
Bit #1
–
1
1
0
0
1
1
0
0
Select #
MC33411A/B
10
4.0
3.0
2.0
1.0
0
0
1
2
3
Gain Control
Bit #0
1.0 dB steps, measured from Pin 38 to 36. Bits 7/4–0 are
used to set the gain according to Table 3. The mute switch,
controlled by bit 6/1, will mute a minimum of 60 dB.
expander input level, the Rx output (Pin 36) can be attenuated
(referenced to the expander output) by bits 6/10–9. For
6/10–9 = 00, the attenuation is 0 dB. For the other
combinations, 6/10–9 = 01, attenuation = 3.0 dB; 6/10–9 =
10, attenuation = 6.0 dB; and 6/10–9 = 11, attenuation = 10.4
dB (See Table 2).
be accessed in Register 7. Table 4 is the volume control
settings, also located in Register 7.
of the reveive audio path.
–
0
1
0
1
0
1
0
1
–5.0
Amount at Expander Input
–10
–15
–20
–25
–30
–35
–40
The gain stage provides 20 dB of gain adjustment in
When the compressor output is within 3.0 dB of the
The expander can be bypassed by setting bit 6/3 = 1.
Table 3 shows the various gain control settings which can
Figures 23 through 31 illustrate the various characteristics
0
–60
Side Tone Attenuate
V CC = 3.6 V
T A = 25 C
Figure 22. Tx Output Audio Response
–50
1.5 dB
3.0 dB
5.2 dB
0 dB
Gain
Ctl #
<6
10
11
12
13
6
7
8
9
–40
(Lim off, R6/12 = 1)
Tx Out
MCI VOLTAGE (dBV)
–30
Distortion
Amount at Expander Output
–20
Side Tone Attenuate
Gain/Attenuation
Amount
–10
–9.0 dB
–9.0 dB
–8.0 dB
–7.0 dB
–6.0 dB
–5.0 dB
–4.0 dB
–3.0 dB
–2.0 dB
10.4 dB
3.0 dB
6.0 dB
0 dB
0
21
10
4.0
3.0
2.0
1.0
0