NJU8752 Datasheet, PDF (1/6 Pages) New Japan Radio – Analog Signal Input Class D Amplifier for Piezo Speaker

NJU8752
PRELIMINARY
Analog Signal Input Class D Amplifier for Piezo Speaker
GENERAL DESCRIPTION
NJU8752 is a monaural analog signal input class D
amplifier for Piezo speaker. The NJU8752 includes
Inversion operational amplifier input circuit, PWM
modulator, Output short protector and a low voltage
detector. Input part operates on 3.3V(TYP) as power
supply and Output part operates up to 13.75V(MAX).
Therefore, it drives Piezo speaker with Higher volume
and High efficiency.
By using equivalent capacitance of Piezo speaker,
the NJU8752 is configured as a BTL amplifier capable
of operating Piezo speaker with the minimum external
components. A BTL configuration eliminates the need
for external AC coupling capacitors.
Class D achieves high output-efficiency, which leads
to low power operation for Piezo speaker, thus the
NJU8752 is ideally suited for battery powered
applications.
PACKAGE OUTLINE
NJU8752V
FEATURES
Piezo Speaker Driving
Analog Audio Signal Input, 1-channel BTL Output
Standby(Hi-Z), Mute Control
Built-in Low Voltage Detector
Built-in Short Protector
Operating Voltage
3.0 ~ 3.6V(Input)
9.0 ~ 13.75V(Output)
C-MOS Technology
Package Outline
SSOP14
PIN CONFIGURATION
V_DD
1
14
IN
2
13
TEST 1
3
12
MUTE
4
11
V_SS
5
10
OUT_P
6
9
V_DDO
7
8
BLOCK DIAGRAM
V_DD
V_SS
V_SS
COM
TEST 2
STBY
V_SS
OUT_N
V_DDO
IN
COM
-
+
Pulse
Width
-
Modulator
+
V_DDO
OUT_P
V_SS
V_DDO
OUT_N
V_SS
Short
Protector
Soft Start
Control Logic
Low Voltage
Detector
MUTE
TEST 1
STBY
TEST 2
-1-