MC33411AFTA Ver la hoja de datos (PDF) - Motorola => Freescale
Número de pieza
componentes Descripción
Fabricante
MC33411AFTA Datasheet PDF : 43 Pages
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MC33411A/B
Figure 21. Tx Output Audio Response
(Lim off, R6/11 = 1)
0
4.0
–5.0
VCC = 3.6 V
TA = 25°C
–10
3.0
Figure 22. Tx Output Audio Response
(Lim off, R6/12 = 1)
0
4.0
–5.0
VCC = 3.6 V
TA = 25°C
–10
3.0
–15
–15
–20
Tx Out
2.0
–20
Tx Out
2.0
–25
–25
–30
1.0
–30
1.0
–35
Distortion
–35
Distortion
–40
0
–60 –50 –40 –30 –20 –10
0
10
–40
0
–60 –50 –40 –30 –20 –10
0
10
MCI VOLTAGE (dBV)
MCI VOLTAGE (dBV)
Data Slicer
The gain stage provides 20 dB of gain adjustment in
The data slicer will receive the low level digital signal from
1.0 dB steps, measured from Pin 38 to 36. Bits 7/4–0 are
the RF receiver section at Pin 39. The input signal to the data
used to set the gain according to Table 3. The mute switch,
slicer must be >200 mVpp. Hysteresis of 40 mV is internally
controlled by bit 6/1, will mute a minimum of 60 dB.
provided. The output of the data slicer will be same
When the compressor output is within 3.0 dB of the
waveform, but with an amplitude of 0 to VCC, and can be
observed at Pin 17 if bits 5/9–8 are set to 00. The output can
expander input level, the Rx output (Pin 36) can be attenuated
(referenced to the expander output) by bits 6/10–9. For
be inverted by setting bit 5/9 = 1. The data slicer can be
6/10–9 = 00, the attenuation is 0 dB. For the other
disabled by setting bit 5/8 = 1.
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
Receive Audio Path
dB (See Table 2).
The Receive Audio Path (Pins 38, 36–33) consists of an
The expander can be bypassed by setting bit 6/3 = 1.
anti–aliasing filter, a low–pass filter, side tone attenuator, gain
Table 3 shows the various gain control settings which can
adjust stage, a mute switch, expander and volume control.
be accessed in Register 7. Table 4 is the volume control
The switched capacitor low–pass filter is an 8 pole filter,
settings, also located in Register 7.
with a corner frequency at 3.8 kHz. This is designed to
Figures 23 through 31 illustrate the various characteristics
provide bandwidth limiting in the audio range.
of the reveive audio path.
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Table 2. Side Tone Attenuate Programming
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Side Tone
Side Tone
Side Tone Attenuate
Side Tone Attenuate
Attenuate Bit #1
Attenuate Bit #0
Select #
Amount at Expander Input Amount at Expander Output
0
0
0
0 dB
0 dB
0
1
1
1.5 dB
3.0 dB
1
0
2
3.0 dB
6.0 dB
1
1
3
5.2 dB
10.4 dB
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁTabÁÁle 3ÁÁ. RxÁÁGaÁÁin AÁÁdjuÁÁst PÁÁrogÁÁramÁÁminÁÁg (RÁÁegiÁÁsterÁÁ7)ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Gain Control Gain Control Gain Control Gain Control Gain Control
Gain
Gain/Attenuation
Bit #4
Bit #3
Bit #2
Bit #1
Bit #0
Ctl #
Amount
–
–
–
–
–
<6
–9.0 dB
0
0
1
1
0
6
–9.0 dB
0
0
1
1
1
7
–8.0 dB
0
1
0
0
0
8
–7.0 dB
0
1
0
0
1
9
–6.0 dB
0
1
0
1
0
10
–5.0 dB
0
1
0
1
1
11
–4.0 dB
0
1
1
0
0
12
–3.0 dB
0
1
1
0
1
13
–2.0 dB
MOTOROLA RF/IF DEVICE DATA
21
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