NJU26040-16A
Digital Signal Processor for 2ch Speaker System
■
General Description
The NJU26040-16A is a high performance 24-bit digital signal processor.
The NJU26040-16A provides 3D Surround function, Stereo Enhancement function,
Equalizer function, Dynamic Bass Boost function, AGC/Limiter function. These kinds of
sound functions are suitable for docking speaker, boom box, mini/micro-component, TV,
and other speaker system.
■
Package
NJU26040V-16A
■
FEATURES
- Software
•
3D Surround: eala (NJRC Original)
•
Stable center image and natural sound field
•
Stereo Enhancement: eala Stereo Expander (NJRC Original)
•
Reproduce the amazing stereo image even narrow distance between two speakers
•
Equalizer
•
5band biquad filter
•
Band1, 2, 3 : HPF/Parametric Equalizer/is selectable.
•
Band4,5 : HPF/Parametric Equalizer/Bass/Treble is selectable.
•
Master Volume
•
Dynamic Bass Boost (NJRC Original)
•
Two-independent-channel processing for high channel separation
•
AGC/Limiter
•
Clock for Watch Dog Timer
- Hardware
•
24bit Fixed-point Digital Signal Processing
•
Maximum System Clock Frequency
•
Digital Audio Interface
•
Digital Audio Format
•
Master / Slave Mode
•
Power Supply
•
Input terminal
•
Package
•
Micro computer interface
: 38MHz Max
: 3 Input port / 2 Output ports
2
: I S 24bit, Left-justified, Right-justified, BCK : 32fs/64fs
: Master Mode MCK : 1/2 fclk, 1/3 fclk
ex. MCK = 384Fs(1/2) or MCK = 256Fs(1/3) at fclk=768Fs
: 3.3V
: 5V Input tolerant
: SSOP32 (Pb-Free)
2
: I C bus (standard-mode/100kbps, Fast-mode/400kbps)
: Serial interface (4 lines: clock, enable, input data, output data)
The detail hardware specification is described in the “ NJU26040 Series Data Sheet (NJU26040_E_REL.pdf)”.
Ver.2008-03-06
-1-
!
NJU26040-16A
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Function Block Diagram
AD1/SDIN
AD2/SSb
SCL/SCK
24bit Fixed-point DSP Core
SERIAL
HOST
INTERFACE
PROGRAM
CONTROL
24-BIT x 24-BIT
MULTIPLIER
ALU
SERIAL AUDIO
INTERFACE
BCKI
LRI
BCKO
LRO
SDI0
SDI1
SDI2
SDA/SDOUT
RESETb
MCK
CLKOUT
CLK
TIMING
GENERATOR
ADDRESS GENERATION UNIT
SDO0
SDO1
DATA
RAM
FIRMWARE
OTP/RAM
WDC
General I/O
INTERFACE
MUTEb
PROC
SEL
Fig. 1 NJU26040-16A Block Diagram
■
DSP Block Diagram
AGC Bypass Trim
SDI0
AGC
eala
Master Volume
SDI1
SDI1 Input Trim
SDI2
SDI2 Input Trim
eala Stereo
Expander
5band
EQ
PEQ/HPF/Bass/Treble
Dynamic
Bass Boost
Limiter
SDO0
SDO1
either AGC or Limiter
Fig. 2 NJU26040-16A Function Diagram
-2-
Ver.2008-03-06
NJU26040-16A
■
Pin Configuration
VDD
SDA/SDOUT
SCL/SCK
AD1/SDIN
AD2/SSb
RESETb
VDD
VDD
VSS
CLKOUT
CLK
SDI2
SDI1
SDI0
LRI
BCKI
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
VSS
TEST
TEST
SEL
PROC
MUTEb
WDC
VDD
VSS
TEST
MCK
TEST
SDO1
SDO0
LRO
BCKO
Fig. 3 NJU26040-16A Pin Configuration
Ver.2008-03-06
-3-
!
NJU26040-16A
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Pin Description
Table 1 Pin Description
Pin No.
Symbol
1, 7, 8, 25
VDD
2
SDA / SDOUT
I/O
-
OD
Description
Power Supply +3.3V
2
I C I/O / 4-wire Serial Output
This pin requires a pull-up.
2
I C Clock / Serial Clock
2
I C Address / Serial Input
2
I C Address / Serial Enable
Reset (RESETb=’Low’: DSP Reset)
GND
OSC Output
OSC Clock Input
Audio Data Input 2
Audio Data Input 1
Audio Data Input 0
LR Clock Input
Bit Clock Input
Bit Clock Output
LR Clock Output
Audio Data Output 0
Audio Data Output 1
for Test (Do not connect)
Master Clock Output for A/D, D/A
for Test (connect to VSS)
Watch Dog Clock Output (Open drain output)
Master Volume level, After Reset DSP ,“1”:0dB, “0”: Mute
After Reset DSP, “1”: Normal, “0”: Wait for start command
2
2
Select I C or Serial bus (“1”: Serial / “0”: I C-bus)
3
SCL / SCK
I
4
AD1 / SDIN
I
5
AD2 / SSb
I
6
RESETb
I
9, 24, 32
VSS
-
10
CLKOUT
O
11
CLK
I
12
SDI2
I
13
SDI1
I
14
SDI0
I
15
LRI
I
BCKI
I
16
17
BCKO
O
18
LRO
O
19
SDO0
O
20
SDO1
O
21
TEST
O
22
MCK
O
TEST
I-
23, 30, 31
26
WDC
I/O +
27
MUTEb
I/O -
28
PROC
I/O -
29
SEL
I/O -
Note :
I
: Input
I-
: Input (Pull-down)
O
: Output
O + : Output (with Pull-up resistance)
OD : Bi-directional (Open Drain) This pin requires a pull-up resistance.
-4-
Ver.2008-03-06
NJU26040-16A
■
Digital Audio Interface
The NJU26040-16A audio interface provides industry standard serial data format of I S. The NJU26040-16A audio
interface provides three audio data inputs, two audio data outputs as shown in table 2, table 3.
Table 2
Pin No.
14
13
12
Table 3
Pin No.
19
20
Serial Audio Input Pin
Symbol
SDI0
SDI1
SDI2
Description
Audio Data Input 0 L / R
Audio Data Input 1 L / R
Audio Data Input 2 L / R
2
Serial Audio Output Pin
Symbol
SDO0
SDO1
Description
Audio Data Output 0 L / R
Audio Data Output 1 L / R
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Host Interface
The NJU26040-14A can be controlled via Serial Host Interface (SHI) using either of two serial bus formats:I C bus or 4-Wire
serial bus.(Table 4) Data transfers are in 8-bit packets (1 byte) when using either format.
Table 4 Serial Host Interface Pin Description
Pin No.
29
Symbol
SEL
Setting
“Low”
“High”
I C bus
4-Wire serial bus
2
2
Host Interface
Table 5 Serial Host Interface Pin Description
Symbol
2
Pin No.
I C bus Format
2
(I C bus / Serial)
Serial Data Input/Output
2
SDA / SDOUT *
(Open Drain Input/Output)
3
SCL / SCK
*
Serial Clock
2
4
AD1 / SDIN
*
I C bus address Bit1
2
5
AD2 / SSb
*
I C bus address Bit2
4-Wire Serial bus Format
Serial Data Output
(Open-Drain Output)
Serial Clock
Serial Data Input
Serial enable
Note :
SDA pin is a bi-directional open drain.
2
This pin requires a pull-up resistance in both I C bus and 4-Wire serial mode.
When the power supply (V
DD
= +3.3V) is supplied to NJU26040-16A, these pins become +5.0V
Input tolerant.
Ver.2008-03-06
-5-
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