Harman Kardon AVR 2600, Service Manual

Page: 114 / 229

NJW1298
Ver 2.0 for web
8-CHANNEL ELECTRONIC VOLUME WITH INPUT SELECTOR
GENERAL DESCRIPTION PACKAGE OUTLINE
The NJW1298 is a 8-channel electronic volume with
Input Selector. It includes 13-in 4-out stereo audio
selector , REC Output and Multi-channel inputs.
The NJW1298 performs low noise and low distortion
characteristics with resistance ladder circuit.
All of functions are controlled via three-wired serial bus.
Selectable 2-Chip address is available for using two chips
on same serial bus line.
The NJW1298 is suitable for multi-channel audio system,
such as AV amplifier, DVD receiver, and others.
FEATURES
Operating Voltage ±4.5 to ±7.5V
3-Wired Serial Control Chip Address Select Function
13-input 4-output stereo selector
Multi-Channel input (8ch x 2)
Input Selector Gain Control Gain : 0 to -21dB / 3dB step
Volume +31.5 to –95dB / 0.5dB step, Mute
SWch, Cch, LS/RSch output addition to L/R ch output
LB/RBch output addition to LS/RS ch output
Zero Cross Detection
Bi-CMOS Technology
Package Outline QFP100-U1
BLOCK DIAGRAM
NJW1298FU1
RE
C A
RE
C C
+
Stereo Lin
(×13)
M
u
lti-Li
n
M
u
lti-R
in
Lout for
ADC
Multi-Cin
Multi-LSin
Multi-RBin
Multi-SWin
Multi-RSin
Multi-LBin
Control Logic
+
RE
C A
RE
C C
Stereo Rin
(×13)
Lout
Rout
Cout
LSout
RSout
LBout
RBout
SWout
LatchADR Mute
Main Volume:
+31.5 to -95dB/0.5dB step
Input Selector Gain:
0 to -21dB / 3dB step
DataClock
Zero Cross Detection (8ch)
RE
C B
RE
C B
Input Selector
Input Selector
Rout for
ADC
Main
REC_C
REC_B
REC_A
Main
REC_C
REC_B
REC_A
Main
REC_C
REC_B
REC_A
Main
REC_B
REC_A
REC_C
AVR3600
harman/kardon
114