NJW1109
Headphone Amplifier with Electronic Volume
■ PACKAGE OUTLINE
■ GENERAL DESCRIPTION
The NJW1109 is a headphone amplifier with electronic volume. It
includes widely gain adjustable volume, +20 to –80 dB, and mute
function. These are controlled by I2C bus. The NJW1109 is
suitable for headphone output on TV set.
NJW1109D NJW1109M
NJW1109V
■ FEATURES
■ Operating Voltage
■ Electronic Volume
■ I2C Bus Interface
■ Bi-CMOS Technology
■ Package Outline
7.5 to 10 V
+20dB to -80dB / 0.5dB step, Mute
DIP14, DMP14, SSOP14
■ BLOCK DIAGRAM
CAPa
SDA SCL
I2C
ADR
Interface
VOL
VOL
IN a
IN b
OUTa
OUTb
Vref
Bias
CAPb
V+ GND
■ PIN FUNCTION
SYMBOL
V+
SYMBOL
SCL
No.
FUNCTION
Power Supply
No.
8
FUNCTION
1
2
3
4
I2C Bus Clock Input
1
14
OUTb
N.C.
Bch Output
No Connect
9
Vref
INa
Reference voltage stabilized
capacitor connect terminal
10
11
Ach Input
CAPb
Balance control click noise
absorbing capacitor connect
terminal
CAPa
Volume control click noise
absorbing capacitor connect
terminal
5
6
7
INb
ADR
SDA
Bch Input
12
13
14
N.C.
OUTa
GND
No Connect
7
8
I2C Bus Slave Address
Select
I2C Bus Data Input
Ach Output
Ground
– 1 –