SA575DTB ON Semiconductor, SA575DTB Datasheet - Page 6

• Manufacturer Part Number: SA575DTB
• Description: IC COMPANDOR 2CHAN GAIN 20-TSSOP
• Manufacturer: ON Semiconductor
• Type: Compandorr

Specifications of SA575DTB

• Applications: Cellular Radio, Mixers
• Mounting Type: Surface Mount
• Package / Case: 20-TSSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Compressor
Figure 3. In this mode, the rectifier cell and variable gain
cell are in the feedback path. R
feedback to the summing amplifier. The input is AC
coupled through C
In a system with inputs and outputs AC coupled, C
could be eliminated and only R
required. If the external components R
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 typical compressor configuration is shown in
COMP IN
12
V
and output is AC coupled through C
C
10mF
REF
12
13
6
, R
6
8
and R
7
, C
10kW
Figure 3. Typical Compressor Configuration
7
, and C
7
6
, R
provide the DC
C
15
9
7
D
13
G
and C
8
would be
2.2mF
and C
http://onsemi.com
12
7
are
3.8kW
10kW
12
8
30kW
S
R
.
SA575
6
6
C7
the output to input. In the presence of an AC signal this
phenomenon is not observed and the circuit will appear to
function properly.
release time constant is given by Equation 3 and
Equation 4, respectively.
14
11
The compressor gain expression and the attack and
16
1mF
Compressor gain =
30kW
R
7
C
4.7mF
t
13
R
where V
= t
A
= 10 kW x C
IN
10mF
C
(avg) = 0.95V
8
3.8 kW x 100 mA
RECT
4V
= 10 kW x C
IN
(avg)
IN(RMS)
COMP OUT
4
1/2
(eq. 3)
(eq. 4)