NJU8752/52B
NJU3555
PRELIMINARY
Analog Signal Input Class D Amplifier for Piezo Speaker
PACKAGE OUTLINE
GENERAL DESCRIPTION
The NJU8752/NJU8752B is an analog signal input
monaural class D amplifier for Piezo speaker. The
NJU8752/52B includes Inversion operational amplifier
input circuit, PWM modulator, an output-short protector
and a low voltage detector. Input part operates on
3.3V(TYP) as power supply and Output part operates
up to 16.0V(MAX). Therefore, it drives Piezo speaker
with louder sound and High efficiency.
The NJU8752/52B incorporates BTL amplifier, which
eliminate AC coupling capacitors, capable of driving
Piezo speaker with simple external LC low-pass filters.
Class D operation achieves lower power operation for
Piezo speaker, thus the NJU8752/52B is suited for
battery powered applications.
NJU8752V/52BV
PIN CONFIGURATION
FEATURES
Piezo Speaker Driving
1-channel Analog Signal Input, 1-channel BTL Output
Standby(Hi-Z), Mute Control
Voltage Gain
31dB(NJU8752)
20dB(NJU8752B)
Built-in Low Voltage Detector
Built-in Short Protector
Operating Voltage Input: 2.7 ~ 3.6V (NJU8752)
3.1 ~ 3.6V (NJU8752B)
Output: 6.0 ~ 16.0V
C-MOS Technology
Package Outline
SSOP14
14
13
12
11
10
9
8
1
2
3
4
5
6
7
VDD
IN
TEST 1
MUTE
VSS
OUTP
VDDO
VSS
COM
TEST 2
STBY
VSS
OUTN
VDDO
BLOCK DIAGRAM
VDD
VSS
VDDO
IN
OUTP
+
-
VSS
Pulse
Width
Modulator
VDDO
OUTN
+
COM
VSS
Short
Protector
Soft Start
Control
MUTE
Ver.2004-03-05
Logic
Low Voltage
Detector
TEST 1
STBY
TEST 2
-1-
