UTC 3544
PIN DESCRIPTIONS
PIN NO.
PIN NAME
I/O
LINEAR INTEGRATED CIRCUIT
PIN VOLTAGE
INTERNAL EQUIVALENT CIRCUIT
Vcc
FUNCTION
Output pin
1
OUT1
O
2.1V
1
7
7
OUT2
O
2.1V
(Vcc=5V)
10k
Vcc
2
MUTE
I
0.1V
(When open)
2
Mute control pin
(set to low for
prevention of
popping noise
when power is
turned on and off).
Operating: High
Muting: Low(open)
190k
Vcc
Input pin
3
IN1
I
2.1V
3
180k
BIAS
5
IN2
I
2.1V
(Vcc=5V)
5
Vcc
6
BIAS
I/O
2.1V
(Vcc=5V)
60k
6
BIAS
60k
Bias pin(the
external 47μF
capacitor also
serves as the
anti-pop time
constant,
therefore make the
proper
considerations be
changing it).
4
5
GND
Vcc
I
I
-
-
UTC
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QW-R107-040,A