NJU26125
■
General Description
Seat Positioning Surround Decoder
■
Package
The NJU26125 is a high performance 24-bit digital signal processor.
The NJU26125 provides NJRC Original Car Surround technology.
These kinds of sound functions are suitable for Car Audio that has four channel
output speakers.
■
FEATURES
- Software
•Seat
Positioning Surround
Car Surround
Elevation
Bass Enhance
•
Input Trimmer
•
7 Band PEQ: PEQ, LPF, HPF, LSF, HSF
•
Filter: HPF(SDO0/SDO1), LPF(SDO2)
•
Simulated Stereo
•
Master Volume & Channel Trimmer
•
Navigation Voice Mix Trimmer
NJU26125VC2
- Hardware
•
24bit Fixed-point Digital Signal Processing
•
Maximum System Clock Frequency : 12.288MHz Max. built-in PLL Circuit
•
Digital Audio Interface
: 3 Input ports / 3 Output ports
•
Digital Audio Format
: I
2
S 24bit, Left- justified, Right-justified, BCK : 32/64fs
•
Master / Slave Mode
- Master Mode, MCK : 384fs @32kHz, 256fs @48kHz
•
Host Interface
: I
2
C bus (Fast-mode/400kbps)
•
Power Supply
: 3.3V
•
Input terminal
: 5V Input tolerant
•
Package
: SSOP24-C2 (Pb-Free)
Ver.2010-07-01
-1-
NJU26125
■
Function Block Diagram
SCL
I
2
C INTERFACE
SDA
PROGRAM
CONTROL
24Bit x 24Bit
MULTIPLIER
ALU
TIMING
GENERATOR /
PLL
ADDRESS GENERATION UNIT
SERIAL AUDIO
INTERFACE
SDO0-2
BCK
LR
24Bit Fixed-point DSP Core
SDI0-2
RESETb
MCK
CLKOUT
CLK
SLAVEb
Internal Pow er
(1.8V)
WDC
FIRMWARE
ROM
GPIO
INTERFACE
PROC
PROC
AD1
Built-in LDO
VREGO
External
Low -ESR
Capacitors
Required
DATA RAM
1.8V level terminal
Fig. 1 NJU26125 Block Diagram
-2-
Ver.2010-07-01
NJU26125
■
DSP Block Diagram
SDI0 L / R
Lch copy
to Rch
Bass
Enhance
Input Trim
Simulated
Stereo *
Front
Elevation
Front
Surround
Phase
Shifter *
Time
Alignment
Phase
Shifter *
Time
Alignment
SDI1 L / R
Surround
Mix
7 Band PEQ /
5 Band PEQ +
TONE
HPF
SDO0 Front L / R
Rear
Elevation
Rear
Surround
Surround
Mix
7 Band PEQ /
5 Band PEQ +
TONE
HPF
Master Volume &
Channel Trimmer
(Balance &
Fader)
SDO1 Rear L / R
Input Trim
Time
Alignment
SDI2 Navigation Voice
* Simulated Stereo and Phase Shifter do not work at the same
ti
MONO out
(L+R) / 2
LPF
SDO2
SubWoofer L / R
Navi Mix
Trim
Fig. 2 NJU26125 Function Diagram
Ver.2010-07-01
-3-
NJU26125
■
Pin Configuration
RESETb
LR
BCK
SDI2
SDI1
SDI0
MCK
VDD
VSS
STBYb
VSS
VREGO
1
2
3
4
5
6
7
8
9
10
11
12
NJU26125
SSOP24-C2
24
23
22
21
20
19
18
17
16
15
14
13
TEST
SCL
SDA
SDO2
SDO1
SDO0
WDC
PROC
AD1
SLAVEb
CLK
CLKOUT
Fig. 3 NJU26125 Pin Configuration
■
Pin Description
Table 1 Pin Description
No. Symbol I/O Description
No. Symbol
I/O Description
1
RESETb I
RESET (active Low)
13 CLKOUT O
OSC Output
2
LR
I/O LR Clock
14 CLK
I
OSC Clock Input
3
BCK
I/O Bit Clock
15 SLAVEb I
Slave select
4
SDI2
I
Audio Data Input 2 Navi Voice
16 AD1
I
I
2
C Address
5
SDI1
I
Audio Data Input 1 L/R
17 PROC
I
Status select after Reset DSP
6
SDI0
I
Audio Data Input 0 L/R
18 WDC
OD Clock for Watch Dog Timer
7
MCK
I/O Master Clock
19 SDO0
O
Audio Data Output 0 Front L/R
8
VDD
-
Power Supply +3.3V
20 SDO1
O
Audio Data Output 1 Rear L/R
9
VSS
-
GND
21 SDO2
O
Audio Data Output 2 Subwoofer
10 STBYb
I
For TEST (Connected to VDD)
22 SDA
OD I
2
C I/O
11 VSS
-
GND
23 SCL
I
I
2
C Clock
12 VREGO PI
Built-in Power Supply Bypass
24 TEST
I
For TEST(Connected to VSS)
* I : Input, O : Output, I/O: Bi-directional, OD: Open-Drain I/O, PI: Power Supply Bypass
AD1 (No.16) pin and PROC (No.17) pin are input pins. WDC (No.18) pin is open-drain pin with pull-up resistance.
However, these pins operate as bi-directional pins. No.16pin and No.17pin connect with V
DD
or V
SS
through 3.3kΩ
resistance. No.18pin do not connect or connect with V
DD
through 3.3kΩ resistance when unused.
VREGO (No.12) pin is a built-in power supply bypass pin. Connect low-ESR capacitor of 4.7uF and 0.01uF in parallel
between VSS (No.11) pin. A built-in power supply is used only for NJU26125 operation. Be not short-circuited of this pin.
Do not take out the current, and connect other power supplies.
Do not open the terminals without pull-up resistance and pull-down resistance.
-4-
Ver.2010-07-01
NJU26125
■
Absolute Maximum Ratings
( V
SS
=0V=GND, Ta=25°C )
°
Rating
Units
Table 2 Absolute Maximum Ratings
Parameter
Symbol
Supply Voltage *
Supply Voltage Bypass *
In
I/O, OD
Pin Voltage *
Out
CLK
CLKOUT
Power Dissipation
Operating Voltage
Storage Temperature
V
DD
V
REGO
V
x(IN)
V
x(I/O)
,V
x(OD)
V
x(OUT)
V
x(CLK)
V
x(CLKOUT)
-0.3 to 4.2
-0.3 to 2.3
-0.3 to 5.5 (V
DD
≥
3.0V)
-0.3 to 4.2 (V
DD
< 3.0V)
V
V
V
-0.3 to 4.2
565
mW
P
D
-40 to 85
T
OPR
°C
T
STR
-40 to 125
°C
* The LSI must be used inside of the “Absolute maximum ratings”. Otherwise, a stress may cause permanent
damage to the LSI.
* V
DD
: 8 pin
* V
REGO
: 12 pin
* V
x(IN)
: 1, 4, 5, 6, 10, 15, 23, 24 pin
* V
x(OD)
: 22 pin
* V
x(I/O)
: 2, 3, 7, 16, 17, 18 pin
* V
x(OUT)
: 19, 20, 21 pin
* V
x(CLK)
: 14 pin
* V
x(CLKOUT)
: 13 pin
V
DD
V
DD
(1.8V)
V
DD
V
DD
(1.8V)
■
Terminal equivalent circuit diagram
PAD
R
PD
CLK
CLKOUT
SS
Input, I/O (Input part)
(1 to 7, 22, 23pin)
(with R
PU
: 18pin , With R
PD
: 15, 16, 17, 24pin)
V
V
SS
CLK/CLKOUT
(13, 14pin)
V
DD
R
PU
PAD
Output Disable
PAD
V
DD
Output, I/O (Output part)
(2, 3, 7, 16, 17, 19, 20, 21pin )
( Open Drain Output with R
PU
: 18pin)
( Open Drain Output: 22pin )
V
SS
V
SS
STBYb
(10pin)
Fig.4 NJU26125 Terminal equivalent circuit diagram
Ver.2010-07-01
-5-
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