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STA5150 View Datasheet(PDF) - STMicroelectronics

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STA5150
ST-Microelectronics
STMicroelectronics ST-Microelectronics
STA5150 Datasheet PDF : 14 Pages
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STA5150
Gain without compression (G) = 5
Max Attenuation ratio
= 26 dB
The following graph gives the representation of the Compressor activation status related to the Vthreshold and
the input voltage. The delimitation line between the two fields, compression or not, is expressed by the formula :
Vin = 2----------V----t--h----Gr---e---s----h----o---l--d----
Where G is the preamplifier gain without compression.
In the compression region the gain of the preamplifier will be reduced
(G = 2·Vthreshold/Vin) to maintain at steady state the output voltage equal 2*|Vthreshold| .
Instead in the other region the compressor will be off (G = 5).
The delimitation line between the two fields can be related to the output voltage of the preamplifier: in this case
the formula is :
Vout = 2 Vthreshold
Figure 1. Compressor activation field
VIN PEAK
8
6
COMPRESSION
4
G<5
2
D01AU1264
1
2
3
4
G=5
|Vthreshold|
5
The relative attenuation introduced by the variable gain cell is the following :
Attenuation
=
20 log
2--
5
-------V----t--h--------
Vin _peak
The total gain of the stage will be:
Gdb = 20log5 + Attenuation
The maximum input swing is related to the value of input resistor, to guarantee that the input current remain
under Iin_Max value (1 mA).
Ri > V---I-i-i-nn---__--m-p---ea--a-x--k-
8/14
 

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