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PDF SA575 Data sheet ( Hoja de datos )
| Número de pieza | SA575 | |
| Descripción | Low voltage compandor | |
| Fabricantes | Philips | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SA575 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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RF COMMUNICATIONS PRODUCTS
SA575
Low voltage compandor
Product specification
Replaces data of 1997 June 28
IC17
Philips Semiconductors
1997 Nov 07
1 page  
Philips Semiconductors
Low voltage compandor
Product specification
SA575
voltage between Pins 4 and 9 will cause small offset error current in
the rectifier cell. This will affect the accuracy of the gain cell. This
can be improved by using an extra capacitor from the input to Pin 4
and eliminating the DC connection between Pins 4 and 9.
The expandor gain expression and the attack and release time
constant is given by Equation 1 and Equation 2, respectively.
Equation 1.
Expandor gain = 4VIN(avg)
3.8k x 100µA
where VIN(avg) = 0.95VIN(RMS)
Equation 2.
τR = τA = 10k x CRECT = 10k x C4
COMPRESSOR
The typical compressor configuration is shown in Figure 4. In this
mode, the rectifier cell and variable gain cell are in the feedback
path. R6 and R7 provide the DC feedback to the summing amplifier.
The input is AC coupled through C12 and output is AC coupled
through C8. In a system with inputs and outputs AC coupled, C8
and C12 could be eliminated and only R6, R7, C7, and C13 would
be required. If the external components R6, R7 and C7 are
eliminated, then the output of the summing amplifier will motor-boat
in absence of signals or at extremely low signals. This is because
there is no DC feedback path from the output to input. In the
presence of an AC signal this phenomenon is not observed and the
circuit will appear to function properly.
The compressor gain expression and the attack and release time
constant is given by Equation 3 and Equation 4, respectively.
Equation 3.
Compressor gain = 3.8k x 100µA
4VIN(avg)
1/2
where VIN(avg) = 0.95VIN(RMS)
Equation 4.
τR = τA = 10k x CRECT = 10k x C4
AUTOMATIC LEVEL CONTROL
The typical Automatic Level Control circuit configuration is shown in
Figure 5. It can be seen that it is quite similar to the compressor
schematic except that the input to the rectifier cell is from the input
path and not from the feedback path. The input is AC coupled
through C12 and C13 and the output is AC coupled through C8.
Once again, as in the previous cases, if the system input and output
signals are already AC coupled, then C12, C13 and C8 could be
eliminated. Concerning the compressor, removing R6, R7 and C7
will cause motor-boating in absence of signals. CCOMP is necessary
to stabilize the summing amplifier at higher input levels. This circuit
provides an input dynamic range greater than 60dB with the output
within +0.5dB typical. The necessary design expressions are given
by Equation 5 and Equation 6, respectively.
Equation 5.
3.8k x 100µA
ALC gain =
4VIN(avg)
Equation 6.
τR = τA = 10k x CRECT = 10k x C9
EXP IN
C5
10µF
9
10k
∆G
10k
Σ
7
6
4
3.8k
58
C4 2.2µF
VREF
Figure 3. Typical Expandor Configuration
C3
10µF
EXP OUT
SR00705
1997 Nov 07
5
5 Page 
Philips Semiconductors
Low voltage compandor
COMPRESSOR IN
+10dB
100mV
0dB
–10dB
–20dB
–30dB
–40dB
–50dB
+5dB
0dB
–5dB
–10dB
–15dB
–20dB
–25dB
COMPRESSION
EXPANSION
Figure 10. The Companding Function
Product specification
SA575
EXPANDOR OUT
+10dB
100mV
0dB
–10dB
–20dB
–30dB
–40dB
–50dB
SR00712
1997 Nov 07
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet SA575.PDF ] | |
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