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Details, datasheet, quote on part number:NJU8753
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| Part: | NJU8753 |
| Category: | Analog & Mixed-Signal Processing => Amplifiers |
| Description: | Analog Signal Input Class D Amplifier For Piezo Speaker With DC-DC Converter |
| Company: | NJR Corporation |
| Datasheet: | Download NJU8753 datasheet File size : 107 kB |
| Request For quote: | Find where to buy NJU8753
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Datasheet text preview:
NJU8753
PRELIMINARY
Analog Signal Input Class D Amplifier with DC-DC Converter for Piezo Speaker
GENERAL DESCRIPTION
The NJU8753 is an analog signal input class D power amplifier with DC-DC converter for Piezo speaker. Input part operates on 2.85V(typ) and a built-in DC-DC converter generates variable output voltage(up to 12V) with input voltage(2.6 to 4.2V). Therefore, it drives Piezo speaker with louder sound and high efficiency. The NJU8753 incorporates BTL amplifier, which eliminate AC coupling capacitors, capable of driving monaural Piezo speaker with simple external LC low-pass filters. Class D operation achieves lower power operation for Piezo speaker, thus the NJU8753 is suited for batterypowered applications.
PACKAGE OUTLINE
NJU8753KN1
FEATURES
Piezo Speaker Driving Output voltage: 8Vrms(Typ.) @VDDO=10.0V 1-channel Analog Signal Input, 1-channel BTL output Standby(Hi-Z), Built-in DC-DC Converter Built-in Low Voltage Detector Built-in Short Protector Operating Voltage :2.6~3.6V(VDD, VREG) :2.6~4.2V(VBAT) CMOS Technology Package Outline :QFN28
PIN CONFIGURATION
28 1
TEST1 TEST3 VREG FB VSS VSS1 VSS1
VDD VSS IIN COM EN1 TEST2 VDDO
VDDO OUTP VSS NC VSS OUTN VDDO
QFN28
Ver.2003-09-26
VOUT VR EN2 NC VDDO
LX LX
-1-
NJU8753
BLOCK DIAGRAM
VDD VSS VREG VOUT LX VR FB EN2
TEST1 TEST2 TEST3
Switching Regulator
VSS1
VDDO IN + COM +
Pulse Width Modulator
OUTP VSS VDDO OUTN VSS
Short Protector
Soft Start
Control
Logic
Low Voltage Detector
EN1
-2-
Ver.2003-09-26
NJU3555 NJU3555 87 3
PIN DESCRIPTION
Function Maker test 1 1 TEST1 I This pin must be connected to GND. Maker test 3 2 TEST3 I This pin must be connected to GND. 3 VREG - Switching regulator Power Supply : VREG=2.85V 4 FB I Switching regulator Feedback resistor 5 VSS - Power GND : VSS=0V 6,7 VSS1 - Switching regulator Power GND : VSS1=0V 8,9 LX I Switching regulator voltage input 10 VOUT - Switching regulator Power Supply : Vout=10.0V 11 VR O Switching regulator Output voltage Switching regulator Standby Control 12 EN2 I High : Step-up ON Low : Standby ON This pin must be connected to VREG when step-up ON. 13 NC - Non connection 14, 15 VDDO - Output Power supply 16 OUTN O Negative Output 17 VSS - Power GND : VSS=0V 18 NC - Non connection 19 VSS - Power GND : VSS=0V 20 OUTP O Positive output 21, 22 VDDO - Output Power supply Maker Test 2 23 TEST2 I This pin must be connected to GND. Power Amplifier Standby Control 24 EN1 I High : Standby OFF Low : Standby ON This pin must be connected to VDD when Standby OFF. 25 COM - Analog common 26 IN I Audio Signal Input 27 VSS I Power GND : VSS=0V 28 VDD - Power Supply : VDD=2.85V *Pin No.5(VSS), 6(VSS1), 7(VSS1), 17(VSS), 19(VSS), 27(VSS) should be connected at the nearest point to the IC. *Pin No.14(VDDO) , 15(VDDO), 21(VDDO), 22(VDDO) should be connected at the nearest point to the IC. *Pin No.3(VREG) and 28(VDD) must be connected to VDD, when these pins are not used. No. SYMBOL I/O
Ver.2003-09-26
-3-
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