Switching Driver. NJU8789 Datasheet

NJU8789 Driver. Datasheet pdf. Equivalent

NJU8789 Datasheet
Recommendation NJU8789 Datasheet
Part NJU8789
Description Monaural BTL Output Clock-less Switching Driver
Feature NJU8789; NJU8789 Monaural BTL Output Clock-less Switching Driver for Class D Amplifier GENERAL DESCRIPTION T.
Manufacture New Japan Radio
Datasheet
Download NJU8789 Datasheet




New Japan Radio NJU8789
NJU8789
Monaural BTL Output Clock-less Switching Driver for Class D Amplifier
GENERAL DESCRIPTION
The NJU8789 is a monaural BTL output switching driver
for class D amplifier including Separated Power Source
terminals between Input and Output. It converts 1bit
digital signal input, such as PWM or PDM signal.
The NJU8789 realizes very high power-efficiency by
class D operation. Therefore, It is suitable for portable
set with speaker.
PACKAGE OUTLINE
NJU8789V
FEATURES
Clock-less switching driver
1-channel 1bit Audio Signal Input
Monaural BTL Output
Standby(Hi-Z) Control Function
Operating Voltage : 1.8V to 4.5V
Driving Voltage
: VDD to 4.5V
CMOS Technology
Package Outline
: SSOP10
PIN CONFIGURATION
VDD
IN
NC
TEST
STBYb
1
2
3
4
5
10 VSS
9 OUTP
8 VDDO
7 OUTN
6 VSS
BLOCK DIAGRAM
VDD
VDDO
IN
STBYb
LEVEL
SHIFTER
LEVEL
SHIFTER
VSS
OUTN
OUTP
NJU8789
Ver.2009-01-21
-1-



New Japan Radio NJU8789
NJU8789
TERMINAL DESCRIPTION
No.
SYMBOL
I/O
Function
1 VDD Power Supply
8
VDDO
Output Power Supply
6
10
VSS GND terminal
2 IN I 1-bit Data Input Terminal
9
OUTP
O Positive output
7
OUTN
O Negative output
5
STBYB
I
Standby Control Terminal
L: Standby
4
TEST
I
Maker test Terminal
L: Normal operation
3 NC Non connection
*VSS(Terminal No.6,10) should be connected at a nearest point to the IC.
INPUT TERMINAL STRUCTURE
VDD
Input
Terminal
VSS
-- 22 --
Ver.2009-01-21



New Japan Radio NJU8789
NJU38575859
FUNCTIONAL DESCRIPTION
(1) IN terminal (Input Signal)
The input signals are PWM signals or PDM signals.
(2) OUTP and OUTN terminal (Output Signal)
The OUTP and OUTN generate PMW output signal The NJU8789 drives a speaker by the BTL output, and
OUTP is a positive output and OUTN is a negative outputs.
A switching regulator with a high response against a voltage fluctuation is the best selection for the VDDO,
which is the power supply for output drivers.
(3) Standby Control Function
By setting the STBYb terminal to “L”, the NJU8789 becomes standby condition. During standby condition,
OUTP and OUTN are in Hi-Z.
The STBYb terminal must be connected to VDD when not using the Standby Function.
Ver.2009-01-21
-3-







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