NJU26902
- 1 -
Ver.2005-01-11
Digital Audio Delay
!
General Description
The NJU26902 is a digital audio delay. The NJU26902 provides delay-time
adjustment function and digital audio interface.
!
FEATURES
2-Channel Audio Delay (24 bits data width).
Delay Time 85msec at fs = 48kHz ( 128msec at fs = 32kHz , 43msec at fs = 96kHz)
To make long delay time, the NJU26902 can be connected serially.
Non-audio-signal data can be delayed by the NJU26902.
!
Hardware Specification
Digital Audio Interface
:
1 Input port, 1 Output port
Digital Audio Format
:
LJ / RJ / I
2
S 24bit BCK : 64fs / 32fs,
Slave
Mode
Audio Bit Clock (BCK) Frequency :
13MHz Max ( approximate fs=200KHz)
Package
:
SSOP20-M1 Pb-Free
Power Supply
:
2.5V ( +3.3V input tolerant )
!
Function Block Diagram
!
Package
NJU26902VM1
SDO
SDI
Control
Logic
Delay RAM
BCK
SERIAL AUDIO
INTERFACE
LRI
BCK
LRI
L/R
L/R in
NJU26902
SERIAL AUDIO
INTERFACE
RESETb COUNT[5:0] MODE[1:0] SDO_OD BYPASS FS
NJU26902
- 2 -
Ver.2005-01-11
!
Pin Assignment
NJU26902
VDD
RESETb
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
SDI
LRI
COUNT[2]
COUNT[3]
BCKI
COUNT[4]
COUNT[5]
VSS
VSS
VDD
SDO
FS
BYPASS
SDO_OD
COUNT[1]
MODE[1]
COUNT[0]
MODE[0]
!
Pin Description
No. Symbol I/O
Description
1
RESETb
I
Reset (Active low)
2
SDI I
Audio Data Input
3
LRI I
LR Clock Input
4
COUNT[2]
I
Delay Time Control 2
5
COUNT[3]
I
Delay Time Control 3
6
BCKI I
Bit Clock Input
7
COUNT[4]
I
Delay Time Control 4
8
COUNT[5]
I
Delay Time Control 5
9
VSS -
GND
10
VSS -
GND
11
MODE[0]
I
Digital Audio Interface Format Select
12
COUNT[0]
I
Delay Time Control 0
13
MODE[1]
I
Digital Audio Interface Format Select
14
COUNT[1]
I
Delay Time Control 1
15
SDO_OD
I
SDO pin Open Drain Select
16
BYPASS
I
SDO pin BYPASS Control
17
FS
I
BCK fs Select
18
SDO O
Audio Data Output (CMOS Output / Open Drain Output)
19
VDD -
Power Supply +2.5V
20
VDD -
Power Supply +2.5V
I : Input, I
: Input(internal pull-up), I
: Input(internal pull-down), O : Output, P: +Power, G : GND
NJU26902
- 3 -
Ver.2005-01-11
1. Electric Characteristics
1.1 Absolute Maximum Ratings
Table1-1 Absolute Maximum Ratings
(V
SS
=0V, Ta=25
)
Parameter Symbol
Rating
Units
Power Supply Voltage
V
DD
-0.3 to +3.0
V
Input Pin Voltage
V
X(IN)
-0.3 to +3.6
V
SDO Pin Voltage *
1
(CMOS Output)
V
X(O)
-0.3 to V
DD
+0.3
V
SDO Pin Voltage *
2
(Open Drain Output)
V
X(OD)
-0.3 to +3.6
V
Power Dissipation
P
D
300
mW
Storage Temperature
T
stg
-40
to
+125
C
*1 This specification is applied to V
X (O)
at the SDO pin. in case of SDO_OD=
"Low".
*2 This specification is applied to V
X (OD)
at the SDO pin. in case of SDO_OD=
"High".
NJU26902
- 4 -
Ver.2005-01-11
1.2 Electric Characteristics
Table1-2 Electric Characteristics
(V
DD
=2.5V, V
SS
=0V, Ta=25
)
Parameter Symbol
Test
Condition
Min.
Typ.
Max.
Units
Operating V
DD
Voltage
V
DD
2.25 2.5 2.75 V
Operating Current
I
DD
BCKI:13MHz
SDO:C
L
=25pF
- 1.0 - mA
Operating Temperature
T
OPR
-40 25 85
High Level Input Voltage
V
IH
2.0 - 3.3 V
Low Level Input Voltage
V
IL
-
- 0.5 V
High Level Output Voltage
(SDO_OD="Low")
V
OH
I
OH
= -2mA
I
OH
= -100uA
V
DD
-0.4
V
DD
-0.1
-
-
V
DD
V
DD
V
Low Level Output Voltage
V
OL
I
OL
= 2mA
I
OL
= 100uA
0
0
-
-
0.4
0.1
V
Open Drain Output Current
(SDO_OD="High")
I
OD
V
IN
= 3.3V
-15
-
+15
Input Current
I
IN
V
IN
= V
SS
to 3.3V
-15
-
+15
uA
Input Current
(Internal Pull-up Pin)
I
IN(PU)
V
IN
= V
SS
to 3.3V
-100
-
+15
uA
Input Current
(Internal Pull-down Pin)
I
IN(PD)
V
IN
= V
SS
to 3.3V
-15
-
+200
uA
Input Capacitance
C
IN
- 10 - pF
Input Rise/Fall transition Time
t
r
/ t
f
-
- 100 ns
!
Equivalent Circuit
Input Pin
Input Pin
Output Pin
SDI, LRI, BCKI
Internal Pull-up (PU) :
SDO
RESETb, MODE[1], FS,
COUNT[5], COUNT[4], COUNT[3],
COUNT[2], COUNT[1], COUNT[0],
Internal Pull-down (PD) :
MODE[0],
SDO_OD,BYPASS
Fig. 1-1 I/O Equivalent Circuits
Input
terminal
VDD
VSS
Input
terminal
VDD
VSS
PU
PD
Output
terminal
VDD
VSS
NJU26902
- 5 -
Ver.2005-01-11
2. Serial Audio Data Transmitting Diagram
Fig. 2-1 Left-Justified Data Format 64fs, 24bit Data
Fig. 2-2 Right-Justified Data Format 64fs, 24bit Data
Fig. 2-3 I
2
S Data Format 64fs, 24bit Data
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
23
Left Channel
Right Channel
MSB
MSB
LSB
LSB
32 Clocks
32 Clocks
LRI, LRO
BCKI, BCKO
SDI, SDO
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
Left Channel
Right Channel
MSB
MSB
LSB
LSB
32 Clocks
32 Clocks
LRI, LRO
BCKI, BCKO
SDI, SDO
0
2
1
0
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Left Channel
Right Channel
MSB
MSB
LSB
LSB
32 Clocks
32 Clocks
LRI, LRO
BCKI, BCKO
SDI, SDO
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