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PA4863 Datasheet(PDF) 6 Page - Unisonic Technologies

Part # PA4863
Description  DUAL 2.2W AUDIO AMPLIFIER PLUS STEREO HEADPHONE FUNCTION
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Manufacturer  UTC [Unisonic Technologies]
Direct Link  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

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PA4863
CMOS IC
UNISONICTECHNOLOGIESCO.,LTD
6 of 12
www.unisonic.com.tw
QW-R502-120.D
TYPICAL APPLICATION CIRCUIT
SLEEVE
AMP 1A
VDD
CS
0.1µF
TANT
RF
20KΩ
RI
20KΩ
Audio
Input
CI
1μF
-
+
20KΩ
20KΩ
20KΩ
-OUT A 5
3
+OUT A
RL
CO
100µF
+
1kΩ
To HP-IN Circuit
50KΩ
50KΩ
VDD/2
-IN A
+IN A
Bypass
-IN B
+IN B
Shutdown
1
16
GND 2,7,15
100KΩ
20KΩ
RF
20KΩ
CI
1μF
Audio
Input
100kΩ
VDD
To Control Pin on
Headphone jack
20KΩ
20KΩ
20KΩ
-OUT B
+OUT B
12
14
RL
+
1kΩ
CONTROL PIN
HEADPHONE JACK
TIP
10
11
9
8
6
4,13
AMP 1B
-
+
AMP 2A
-
+
AMP 2B
-
+
HP-IN
RING
CB
(CB size)
0.33μF
+
RI
CO
100µF
Note: Pin out shown for DIP-16. Refer to the PIN CONFIGURATION for the pin out of other packages.
Figure 1.Typical Audio Amplifier Application Circuit
EXTERNAL COMPONENTS DESCRIPTION
Components
Functional Description
RI
The inverting input resistance, along with RF, set the closed-loop gain. RI, along with CI form a
high pass filter with fc=1/(2πRICI)
CI
The input coupling capacitor blocks DC voltage at the amplifier’s input terminals. CI, along with
RI, create a high pass filter with fc=1/(2πRICI). Refer to the section. Selecting Proper External
Components, for an explanation of determine the value of CI.
RF
The feedback resistance, along with RI, set the closed-Ioop gain.
CS
The supply bypass capacitor. Refer to the Power Supply Bypassing section for information about
properly placing and selecting the value of, this capacitor.
CB
The capacitor, CB, filters the half-supply voltage present on the Bypass pin. Refer to the Selecting
Proper External Components section for information concerning proper placement and selecting
CB’S value.


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