參數(shù)資料
型號： MC13111BFB
廠商： MOTOROLA INC
元件分類： 無繩電話/電話
英文描述： UNIVERSAL NARROWBAND FM RECEIVER INTEGRATED CIRCUIT
中文描述： TELECOM, CORDLESS, RF AND BASEBAND CIRCUIT, PQFP52
封裝： PLASTIC, QFP-52
文件頁數(shù)： 36/68頁
文件大?。?/td> 1316K
代理商： MC13111BFB
MC13110A/B MC13111A/B
36
MOTOROLA ANALOG IC DEVICE DATA
Transmit Audio Path
This portion of the audio path goes from “C In” to “Tx Out”.
The “C In” pin will be ac–coupled. The audio transmit signal
path includes automatic level control (ALC) (also referred to
as the Compressor), Tx mute, limiter, filters, and Tx gain
adjust. The ALC provides “soft” limiting to the output signal
swing as the input voltage slowly increases. With this
technique the gain is slightly lowered to help reduce distortion
of the audio signal. The limiter section provides hard limiting
due to rapidly changing signal levels, or transients. This is
accomplished by clipping the signal peaks. The ALC, Tx
mute, and limiter functions can be enabled or disabled via the
MPU serial interface. The Tx gain adjust can also be remotely
controlled to set different desired signal levels. The typical
maximum output voltage at “Tx Out” should be approximately
0 dBV @ THD = 5.0%.
Figures 82 to 86 represent the transmit audio path filter
response. The filter response attenuation, again, is very
definite above 3800 Hz. This is the filter cutoff frequency.
Inband (audio), wideband, and ripple characteristics are also
shown in these graphs.
The compressor transfer characteristics, shown in
Figure 87, has three different slopes. A typical compressor
slope can be found between –55 and –15 dBV. Here the
slope is 2.0. At an input level above –15 dBV the automatic
level control (ALC) function is activated and prevents hard
clipping of the output. The slope below –55 dBV input level is
one. This is where the compressor curve ends. Above 5.0
dBV the output actually begins to decrease and distort. This
is due to supply voltage limitations.
In Figure 88 the ALC function is off. Here the compressor
curve continues to increase above –15 dBV up to –4.0 dBV.
The limiter begins to clip the output signal at this level and
distortion is rapidly rising. Similarly, Figure 68 (ALC and
Limiter Off) shows to compressor transfer curve extending all
the way up to the maximum output. Finally, Figure 90 through
93 show the Tx Out signal versus several combinations of
ALC and Limiter selected.
Figure 81 is the noise data measured for the
MC13110A/13111A. This data is for 0 dB gain setting and –20
dBV (100 mVrms) audio levels.
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Transmit
Scrambler
Gain
(dB)
Transmit
Amp_Out
(dBV)
(dBV)
off/on
muted
muted
< –95
off
–9.0
< –95
–83
off
0
< –95
–74
off
10
< –95
–64
on (MC13110A)
–9.0
< –95
–82
on (MC13110A)
0
< –95
–73
on (MC13110A)
10
–< –95
–63
Mic Amp
Like the Speaker Amp the Mic Amp is also an inverting
rail–to–rail operational amplifier. The noninverting input
terminal is connected to the internal VB reference. External
resistors and capacitors are used to set the gain and
frequency response. The “Tx In” input is ac–coupled.
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