SA575DG ON Semiconductor, SA575DG Datasheet - Page 5

• Manufacturer Part Number: SA575DG
• Description: IC COMPANDOR 2CHAN GAIN 20-SOIC
• Manufacturer: ON Semiconductor
• Type: Compandorr

Specifications of SA575DG

• Applications: Cellular Radio, Mixers
• Mounting Type: Surface Mount
• Package / Case: 20-SOIC (7.5mm Width)
• Package: 20SOIC W
• Operating Temperature: -40 to 85 °C
• Product: General Purpose Audio Amplifiers
• Output Type: Programmable Analog
• Available Set Gain: +/- 1.5 dB
• Common Mode Rejection Ratio (min): 80 dB
• Thd Plus Noise: 0.12 %
• Operating Supply Voltage: 5 V
• Supply Current: 4.2 mA
• Maximum Power Dissipation: 1116 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Audio Load Resistance: 600 Ohms
• Input Bias Current (max): +/- 1 uA
• Input Offset Voltage: 3 mV
• Minimum Operating Temperature: - 40 C
• Supply Voltage (max): 7 V
• Supply Voltage (min): 3 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: SA575DG; SA575DGOS

Expandor
The variable gain cell and the rectifier cell are in the signal
input path. The V
maximum headroom without clipping. The 0 dB ref is
100 mV
output is AC coupled through C
and outputs are AC coupled, then C
eliminated, thus requiring only one external component,
C
so any offset voltage between Pins 4 and 9 will cause small
offset error current in the rectifier cell. This will affect the
4
The typical expandor configuration is shown in Figure 2.
. The variable gain cell and rectifier cell are DC coupled
RMS
EXP IN
. The input is AC coupled through C
REF
10mF
C
5
is always 1/2 V
4, 16
9, 11
3
. If in a system the inputs
3.8kW
10kW
Figure 2. Typical Expandor Configuration
CC
3
and C
C
to provide the
4
D
G
5, 15
5
5
, and the
2.2mF
can be
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SA575
8
5
V
REF
S
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.
time constant is given by Equation 1 and Equation 2,
respectively.
10kW
The expandor gain expression and the attack and release
7, 13
6, 14
t
Expandor gain =
R
= t
where V
A
= 10 kW x C
IN
10mF
C
(avg) = 0.95V
3
RECT
3.8 kW x 100 mA
4V
= 10 kW x C
IN
IN(RMS)
(avg)
EXP OUT
2
4
(eq. 1)
(eq. 2)