Hitachi HA12136AF Dolby b-type noise reduction system Datasheet

HA12134A, HA12135A, HA12136A
Dolby B-Type Noise Reduction System
ADE-207-016B (Z)
3rd Edition
Jun. 1999
Description
The HA12134A, HA12135A, HA12136A are silicon monolithic bipolar IC series providing dual channel
Dolby B-type noise reduction system* in one chip. The circuit is used primarily to reduce the level of
background noise introduced during recording and playback of audio signals on magnetic tape.
HA12134A series provide the following functions and features.
Functions
• Dual Dolby B-type NR processor
• NR ON/OFF control switch.
• Record (encode)/playback (decode) control switch.
Features
• Separate record/playback input and output.
Unprocessed signal output available in the encode and decode modes.
• Reduction of external components count.
• Small capacitor value for the reference voltage.
• NR ON/OFF switching and REC/PB switching are provided internally.
• 2-type package (DP-16, FP-16DA)
• Wide range of operating supply voltage.
* Dolby is a trademark of Dolby Laboratories Licensing Corporation.
A license from Dolby Laboratories Licensing Corporation is required for the use of this IC.
HA12134A, HA12135A, HA12136A
Ordering Information
Type No
Dolby Level (mVrms)
Package
HA12134A
300
DP-16
HA12134AF
FP-16DA
HA12135A
450
DP-16
HA12135AF
FP-16DA
HA12136A
580
DP-16
HA12136AF
FP-16DA
Block Diagram
REC IN
GND
PB IN
REC/PB PB OUT
BIAS
DET
REC OUT
0.22 µ
18 k
22 k
15
16
14
12
13
11
10
9
SW
BUF
AMP
SIDE
CHAIN
SW
BUF
AMP
SIDE
CHAIN
BIAS
1
2
3
4
+
1µ
REC IN
2
V CC
PB IN
5
+
22 µ
6
8
0.22 µ
22 k
V REF NR
ON/OFF
7
PB OUT
DET
REC OUT
HA12134A, HA12135A, HA12136A
Absolute Maximum Ratings (Ta = 25°C, Unless otherwise specified.)
Item
Symbol
Rating
Unit
Supply voltage
Vccmax
16
V
Power dissipation
Pd
250
mW
Operating temperature
Topr
–40 to +85
°C
Storage temperature
Tstg
–55 to +125
°C
Lead temperature
TI
260
°C
Note:
Note
Ta ≤ 85 °C
Note 1
1. Soldering 10 sec.
3
HA12134A, HA12135A, HA12136A
Electrical Characteristics (Ta = 25°C, VCC = 12 V, Unless otherwise specified.)
Item
Symbol
Min
Typ
Max
Unit
Test conditions
6.5
12.0
16.0
V
Enable functional operations
HA12135A
8.0
12.0
16.0
HA12136A
9.5
12.0
16.0
—
7
—
mA
No signal, REC NR-ON
dB
Pin 1→Pin 6
Operating voltage HA12134A Vope
Quiescent current
IQ
Voltage gain of
HA12134A GVIA
21.0
23.0
25.0
input amp
HA12135A
24.5
26.5
28.5
(Pin 16→Pin 11)
HA12136A
26.5
28.5
30.5
Vout = 0 dB, f = 1 kHz
NR encode boost
V 8 (9) (NR ON)
ENC-1.4 2.9
k (1)
4.4
5.9
dB
f = 1.4 kHz
V 8 (9) (NR OFF) = –20 dB
V 8 (9) (NR OFF)
ENC-1.4 6.0
k (2)
7.5
9.0
dB
f = 1.4 kHz
V 8 (9) (NR OFF) = –30 dB
ENC-5 k 1.7
(1)
3.2
4.7
dB
f = 5 kHz
V 8 (9) (NR OFF) = –20 dB
ENC-5 k 6.7
(2)
8.2
9.7
dB
f = 5 kHz
V 8 (9) (NR OFF) = –30 dB
ENC-10 k –1.1
(1)
0.4
1.9
dB
f = 10 kHz
V 8 (9) (NR OFF) = 0 dB
ENC-10 k 9.8
(2)
10.4
11.8
dB
f = 10 kHz
V 8 (9) (NR OFF) = –40 dB
T.H.D
(REC)
—
0.05
0.3
%
f = 1 kHz
V 8 (9) (NR ON) = 0 dB
12.0
13.0
—
dB
f = 1 kHz,
VCC = 6.5 V
T.H.D = 1%
VCC = 8.0 V
T.H.D (REC)
Signal handling
HA12134A Vomax
HA12135A (REC)
HA12136A
VCC = 9.5 V
Signal/noise ratio
(REC)
S/N
(REC)
62.0
68.0
—
dB
Rg = 5.1 kΩ
weighted
CCIR/ARM
Crosstalk (ENC)
(Pin 8 – Pin 9)
CT R→L 52.0
L→R
60.0
—
dB
f = 1 kHz
NR OFF
Control voltage for
REC/PB
REC
—
VCC
V
REC/PB
22 k
12
2.5
Measure
Control voltage for
NR ON/OFF
PB
0.0
—
0.5
ON
2.5
—
VCC
V
NR
ON/OFF
5
Measure
22k
Channel balance
4
OFF
0.0
—
0.5
∆GVIA
–1.0
0.0
1.0
dB
HA12134A, HA12135A, HA12136A
Electrical Characteristics (Ta = 25°C, VCC = 12 V, Unless otherwise specified.) (cont)
Item
Symbol
Min
Typ
Max
Unit
Test conditions
Offset voltage
V 8 (9) (NR-ON) –
V 8 (9) (NR-OFF)
∆Vorec
–50
0.0
50
mV
REC mode
VCC = 16.0 V
Test Circuit
R10
10k
SW9
P
R
R11
5.1k
SW1
OFF
To Vcc
C11
+
SW8
PB
REC
0.68µ
C12
+
R8
22k
R9
18k
1µ 16
REC
IN
C9
+
R7
10k
C10
0.22µ
15
14
13
12
11
10
9
GND
PB IN
BIAS
REC/
PB
PB
OUT
DET
REC
OUT
10µ R6
10k
L
ON
AUDIO SG
HP339A or
EQUIVALENT
R
SW6
SW2
REC
IN
R1
5.1k C1+ 1
1µ
R
SW3 P C2+
R2
10k
SW7
10µ P
C8
R
+
NR
PB
ON/OFF OUT
Vcc
PB IN V REF
6
4
3
5
2
C13
C3
+ +
C4
100µ
R3
+
1µ 22µ
22k
ON
OFF
0.68µ
OFF
ON
SW10
DC POWER
SOURCE
SW4
DET
7
10µ R
C6 P
+
10µ
DISTORTION
ANALYZER
HP339A or
EQUIVALENT
OSCILLOSCOPE
TEKTRO 475 or
EQUIVALENT
REC
10k
OUT
R5
8 +C7
C5
0.22µ
AC VOLT
METER
HP 400E or
EQUIVALENT
SW5
NOISE METER
WITH CCIR/
ARM FILTER
R4
10k
Notes: 1. Resistor tolerances are ±1%
2. Capacitor tolerances are ±1%
3. Unit R: Ω C: F
5
HA12134A, HA12135A, HA12136A
Pin Description (Ta = 25°C, V CC = 12 V, No signal, The value in the table show typical
value.)
Pin No. Symbol
R (in)
VDC
1, 16
56 kΩ
6.0 V
REC IN
Equivalent circuit
Description
VCC
Recording (encode) input
56k
VCC /2
GND
2
VCC
—
12.0 V
3, 14
PB IN
100 kΩ 6.0 V
Power supply
VCC
Playback (decode) input
100k
VCC /2
GND
4
VREF
—
5
NR ON/OFF —
6.0 V
Reference voltage
—
VCC
1k
Mode control pin for NR
ON/OFF
“H”→NR ON
“L”→NR OFF
3 VBE
4 VBE
100k
GND
6, 11
PB OUT
—
6.0 V
VCC
100
100
GND
6
Playback (decode) output
HA12134A, HA12135A, HA12136A
Pin Description (Ta = 25°C, V CC = 12 V, No signal, The value in the table show typical
value.) (cont)
Pin No. Symbol
R (in)
VDC
7, 10
—
1.3 V
DET
Equivalent circuit
Description
Time constant pin for the
level detector
VCC
GND
8, 9
REC OUT
—
6.0 V
Recording (encode)
output
VCC
100
100
GND
12
REC/PB
—
—
VCC
1k
Mode control pin for
REC/PB (encode/decode)
“H” → REC (encode)
“L” → PB (decode)
3 VBE
4 VBE
100k
GND
13
BIAS
—
VCC
1.0 V
Reference current input
pin for the active filters
GND
15
GND
—
0V
—
Ground
7
HA12134A, HA12135A, HA12136A
10
No Signal
HA12134A/5A/6A
Quiescent current I Q [mA]
8
NR-ON
NR-OFF
6
4
2
0
4
6
8
10
12
14
16
18
Supply voltage Vcc [V]
Figure 1 Quiescent Current vs. Supply Voltage
3.0
Control voltage (REC/PB) [V]
HA12134A/5A/6A
2.5
REC Mode
2.0
1.5
1.0
PB Mode
0.5
0
4
6
8
10
12
14
16
18
Supply voltage Vcc [V]
Figure 2 REC/PB Control Voltage vs. Supply Voltage
8
HA12134A, HA12135A, HA12136A
3.0
Control voltage (NR-ON/OFF) [V]
HA12134A/5A/6A
2.5
2.0
NR-ON
1.5
1.0
NR-OFF
0.5
0
4
6
8
10
12
14
16
18
Supply voltage Vcc [V]
Figure 3 NR-ON/OFF Control Voltage vs. Supply Voltage
12
HA12136A
16 V
12 V
10
–40 dB
Encode boost [dB]
9.5 V
8
–30 dB
6
4
–20 dB
2
–10 dB
0
100 200
0 dB
500
1k
2k
5k
10 k 20 k
50 k
100 k
Frequency [Hz]
Figure 4 Encode Boost vs. Frequency
9
HA12134A, HA12135A, HA12136A
PB Out
NR–ON/OFF
HA12136A
Output gain Gv [dB]
30
20
REC Out
NR–OFF
10
0
100
300
600 1 k
3k
6 k 10 k
30 k
60 k 100 k
300 k 600 k 1 M
Frequency [Hz]
Figure 5 REC Mode Output Gain vs. Frequency
HA12136A
Output gain Gv [dB]
30
REC Out
NR–ON
PB Out
NR–OFF
20
10
REC Out
NR–OFF
0
100
300
600 1 k
3k
6 k 10 k
30 k
60 k 100 k
Frequency [Hz]
Figure 6 PB Mode Output Gain vs. Frequency
10
300 k 600 k 1 M
HA12134A, HA12135A, HA12136A
HA12136A
Ripple rejection ratio R.R.R. [dB]
0
–10
–20
NR–ON
–30
NR–OFF
–40
100
200
400
1k
2k
4k
6k
10 k
20 k
Frequency [Hz]
Figure 7 REC Mode Ripple Rejection Ratio vs. Frequency
HA12136A
Ripple rejection ratio R.R.R. [dB]
–10
–20
–30
NR–OFF
–40
NR–ON
–50
100
200
400
1k
2k
4k
10 k
20 k
Frequency [Hz]
Figure 8 PB Mode Ripple Rejection Ratio vs. Frequency
11
HA12134A, HA12135A, HA12136A
10
HA12136A
3
V CC = 12 V
T.H.D. [%]
1.0
0.3
0.1
10 kHz
0.03
0.01
–25
100 Hz
1 kHz
–20
–15
–10
–5
0
5
10
15
20
V out [dB]
Figure 9 REC NR-OFF Total Harmonic Distortion vs. Output Level
10
HA12136A
3
V CC = 12 V
T.H.D. [%]
1.0
0.3
10 kHz
1 kHz
0.1
100 Hz
0.03
0.01
–25
–20
–15
–10
–5
0
5
10
15
20
V out [dB]
Figure 10 REC NR-ON Total Harmonic Distortion vs. Output Level
12
HA12134A, HA12135A, HA12136A
10
HA12136A
3
V CC = 12 V
T.H.D. [%]
1.0
0.3
0.1
100 Hz
10 kHz
0.03
1 kHz
0.01
–25
–20
–15
–10
–5
0
5
10
15
20
V out [dB]
Figure 11 PB NR-OFF Total Harmonic Distortion vs. Output Level
10
HA12136A
3
V CC = 12 V
T.H.D. [%]
1.0
0.3
0.1
100 Hz
0.03
0.01
–30 –25 –20
10 kHz
1 kHz
–15
–10
–5
0
5
10
15
20
V out [dB]
Figure 12 PB NR-ON Total Harmonic Distortion vs. Output Level
13
HA12134A, HA12135A, HA12136A
20
HA12136A
Maximum output level Vomax [dB]
19
PB NR-ON
18
17
16
REC NR-OFF
15
PB NR-OFF
REC NR-ON
14
13
12
11
10
8
9
10
11
12
13
14
15
16
Supply voltage V CC [V]
Figure 13 Maximum Output Level vs. Supply Voltage
90
HA12136A
PB NR-ON
S/N [dB]
85
80
REC NR-OFF
75
PB NR-OFF
70
REC NR-ON
65
60
55
8
10
12
14
16
18
Supply voltage V CC [V]
Figure 14 REC/PB Signal To Noise Ratio vs. Supply Voltage
14
HA12134A, HA12135A, HA12136A
12
HA12135A
16 V
12 V
10
–40 dB
Encode boost [dB]
8.0 V
8
–30 dB
6
4
–20 dB
2
–10 dB
0
100 200
0 dB
500
1k
2k
5k
10 k 20 k
50 k 100 k
Frequency [Hz]
Figure 15 Encode Boost vs. Frequency
PB Out
NR–ON/OFF
HA12135A
Output gain Gv [dB]
30
20
REC Out
NR–OFF
10
0
100
300
600 1 k
3k
6 k 10 k
30 k
60 k 100 k
300 k 600 k 1 M
Frequency [Hz]
Figure 16 REC Mode Output Gain vs. Frequency
15
HA12134A, HA12135A, HA12136A
HA12135A
Output gain Gv [dB]
30
REC Out
NR–ON
20
PB–Out
NR–OFF
10
REC Out
NR–OFF
0
100
300
3k
600 1 k
6 k 10 k
30 k
60 k 100 k
300 k 600 k 1 M
Frequency [Hz]
Figure 17 PB Mode Output Gain vs. Frequency
HA12135A
Ripple rejection ratio R.R.R. [dB]
–10
–20
NR–ON
–30
NR–OFF
–40
–50
100
200
400
1k
2k
4k
10 k
20 k
Frequency [Hz]
Figure 18 REC Mode Ripple Rejection Ratio vs. Frequency
16
HA12134A, HA12135A, HA12136A
HA12135A
Ripple rejection ratio R.R.R. [dB]
–10
–20
–30
NR–OFF
–40
–50
100
NR–ON
200
400
1k
2k
4k
10 k
20 k
Frequency [Hz]
Figure 19 PB Mode Ripple Rejection Ratio vs. Frequency
10
HA12135A
3
V CC = 12 V
T.H.D. [%]
1.0
0.3
0.1
10 kHz
0.03
100 Hz
1 kHz
0.01
–20
–15
–10
–5
0
5
10
15
20
V out [dB]
Figure 20 REC NR-OFF Total Harmonic Distortion vs. Output Level
17
HA12134A, HA12135A, HA12136A
10
HA12135A
3
V CC = 12 V
T.H.D. [%]
1.0
0.3
10 kHz
0.1
1 kHz
100 Hz
0.03
0.01
–20
–15
–10
–5
0
5
10
15
20
V out [dB]
Figure 21 REC NR-ON total Harmonic Distortion vs. Output Level
10
HA12135A
3
V CC = 12 V
T.H.D. [%]
1.0
0.3
0.1
100 Hz
10 kHz
0.03
0.01
–20
1 kHz
–15
–10
–5
0
5
10
15
20
V out [dB]
Figure 22 PB NR-OFF Total Harmonic Distortion vs. Output Level
18
HA12134A, HA12135A, HA12136A
10
HA12135A
3
VCC = 12 V
T.H.D. [%]
1.0
0.3
0.1
100 Hz
10 kHz
0.03
1 kHz
0.01
–20
–15
–10
0
–5
5
10
15
20
V out [dB]
Figure 23 PB NR-ON Total Harmonic Distortion vs. Output Level
22
Maximum output level Vomax [dB]
HA12135A
PB NR-ON
20
18
REC NR-OFF
PB NR-OFF
REC NR-ON
16
14
12
10
7
8
9
10
11
12
13
14
15
16
Supply voltage V CC [V]
Figure 24 Maximum Output Level vs. Supply Voltage
19
HA12134A, HA12135A, HA12136A
90
HA12135A
PB NR-ON
S/N [dB]
85
80
REC NR-OFF
75
PB NR-OFF
70
REC NR-ON
65
60
55
8
6
10
12
14
16
18
Supply voltage V CC [V]
Figure 25 REC/PB Signal to Noise Ratio vs. Supply Voltage
12
16 V
HA12134A
12 V
–40 dB
10
Encode boost [dB]
6.5 V
8
–30 dB
6
4
–20 dB
2
–10 dB
0
100 200
0 dB
500
1k
2k
5k
10 k 20 k
Frequency [Hz]
Figure 26 Encode Boost vs. Frequency
20
50 k 100 k
HA12134A, HA12135A, HA12136A
HA12134A
PB Out
NR–ON/OFF
Output gain Gv [dB]
30
20
REC Out
NR–OFF
10
0
100
300 600 1 k
3k
6 k 10 k
30 k 60 k 100 k
300 k 600 k 1 M
Frequency [Hz]
Figure 27 REC Mode Output Gain vs. Frequency
HA12134A
Output gain Gv [dB]
30
REC Out
NR–ON
20
PB Out
NR–OFF
10
REC Out
NR–OFF
0
100
300 600 1 k
3k
6 k 10 k
30 k 60 k 100 k 300 k 600 k 1 M
Frequency [Hz]
Figure 28 PB Mode Output Gain vs. Frequency
21
HA12134A, HA12135A, HA12136A
HA12134A
Ripple rejection ratio R.R.R. [dB]
–10
–20
NR–ON
–30
NR–OFF
–40
–50
100
200
400
1k
2k
4k
10 k
20 k
Frequency [Hz]
Figure 29 REC Mode Ripple Rejection Ratio vs. Frequency
HA12134A
Ripple rejection ratio R.R.R. [dB]
–10
–20
–30
NR–OFF
–40
NR–ON
–50
100
200
400
1k
2k
4k
10 k
20 k
Frequency [Hz]
Figure 30 PB Mode Ripple Rejection Ratio vs. Frequency
22
HA12134A, HA12135A, HA12136A
10
HA12134A
3
V CC = 12 V
T.H.D. [%]
1.0
0.3
0.1
10 kHz
0.03
100 Hz
1 kHz
0.01
–20
–15
–10
–5
0
5
10
15
20
25
V out [dB]
Figure 31 REC NR-OFF Total Harmonic Distortion vs. Output Level
10
HA12134A
3
V CC = 12 V
T.H.D. [%]
1.0
0.3
10 kHz
0.1
100 Hz
1 kHz
0.03
0.01
–20
–15
–10
–5
0
5
10
15
20
25
V out [dB]
Figure 32 REC NR-ON Total Harmonic Distortion vs. Output Level
23
HA12134A, HA12135A, HA12136A
10
HA12134A
3
VCC = 12 V
T.H.D. [%]
1.0
0.3
0.1
100 Hz
1 kHz
0.03
0.01
–20
–15
–10
10 kHz
–5
0
5
10
15
20
25
V out [dB]
Figure 33 PB NR-OFF Total Harmonic Distortion vs. Output Level
10
HA12134A
3
V CC = 12 V
T.H.D. [%]
1.0
0.3
0.1
100 Hz
0.03
10 kHz
1 kHz
0.01
–20
–15
–10
–5
0
5
10
15
20
25
V out [dB]
Figure 34 PB NR-ON Total Harmonic Distortion vs. Output Level
24
HA12134A, HA12135A, HA12136A
26
PB NR-ON
22
20
REC NR-OFF,
PB NR-OFF
18
REC NR-ON
16
14
12
5
6
7
8
9
10
11
12
13
14
15
16
Supply voltage V CC [V]
Figure 35 Maximum Output Level vs. Supply Voltage
90
HA12134A
85
PB NR-ON
80
REC NR-OFF
S/N [dB]
Maximum output level Vomax [dB]
HA12134A
24
75
PB NR-OFF
70
REC NR-ON
65
60
55
4
6
8
10
12
14
16
18
Supply voltage V CC [V]
Figure 36 REC/PB Signal To Noise Ratio vs. Supply Voltage
25
HA12134A, HA12135A, HA12136A
Package Dimensions
Unit: mm
19.20
20.00 Max
6.30
9
1
7.40 Max
16
8
1.3
0.48 ± 0.10
7.62
2.54 Min 5.06 Max
2.54 ± 0.25
0.51 Min
1.11 Max
+ 0.13
0.25 – 0.05
0° – 15°
Hitachi Code
JEDEC
EIAJ
Weight (reference value)
DP-16
Conforms
Conforms
1.07 g
Unit: mm
10.06
10.5 Max
9
1
8
1.27
*0.42 ± 0.08
0.40 ± 0.06
0.10 ± 0.10
0.80 Max
*0.22 ± 0.05
0.20 ± 0.04
2.20 Max
5.5
16
0.20
7.80 +– 0.30
1.15
0° – 8°
0.70 ± 0.20
0.15
0.12 M
*Dimension including the plating thickness
Base material dimension
26
Hitachi Code
JEDEC
EIAJ
Weight (reference value)
FP-16DA
—
Conforms
0.24 g
HA12134A, HA12135A, HA12136A
Cautions
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contact Hitachi’s sales office before using the product in an application that demands especially high
quality and reliability or where its failure or malfunction may directly threaten human life or cause risk
of bodily injury, such as aerospace, aeronautics, nuclear power, combustion control, transportation,
traffic, safety equipment or medical equipment for life support.
4. Design your application so that the product is used within the ranges guaranteed by Hitachi particularly
for maximum rating, operating supply voltage range, heat radiation characteristics, installation
conditions and other characteristics. Hitachi bears no responsibility for failure or damage when used
beyond the guaranteed ranges. Even within the guaranteed ranges, consider normally foreseeable
failure rates or failure modes in semiconductor devices and employ systemic measures such as failsafes, so that the equipment incorporating Hitachi product does not cause bodily injury, fire or other
consequential damage due to operation of the Hitachi product.
5. This product is not designed to be radiation resistant.
6. No one is permitted to reproduce or duplicate, in any form, the whole or part of this document without
written approval from Hitachi.
7. Contact Hitachi’s sales office for any questions regarding this document or Hitachi semiconductor
products.
Hitachi, Ltd.
Semiconductor & Integrated Circuits.
Nippon Bldg., 2-6-2, Ohte-machi, Chiyoda-ku, Tokyo 100-0004, Japan
Tel: Tokyo (03) 3270-2111 Fax: (03) 3270-5109
URL
NorthAmerica
: http:semiconductor.hitachi.com/
Europe
: http://www.hitachi-eu.com/hel/ecg
Asia (Singapore)
: http://www.has.hitachi.com.sg/grp3/sicd/index.htm
Asia (Taiwan)
: http://www.hitachi.com.tw/E/Product/SICD_Frame.htm
Asia (HongKong) : http://www.hitachi.com.hk/eng/bo/grp3/index.htm
Japan
: http://www.hitachi.co.jp/Sicd/indx.htm
For further information write to:
Hitachi Semiconductor
(America) Inc.
179 East Tasman Drive,
San Jose,CA 95134
Tel: <1> (408) 433-1990
Fax: <1>(408) 433-0223
Hitachi Europe GmbH
Electronic components Group
Dornacher Straβe 3
D-85622 Feldkirchen, Munich
Germany
Tel: <49> (89) 9 9180-0
Fax: <49> (89) 9 29 30 00
Hitachi Europe Ltd.
Electronic Components Group.
Whitebrook Park
Lower Cookham Road
Maidenhead
Berkshire SL6 8YA, United Kingdom
Tel: <44> (1628) 585000
Fax: <44> (1628) 778322
Hitachi Asia Pte. Ltd.
16 Collyer Quay #20-00
Hitachi Tower
Singapore 049318
Tel: 535-2100
Fax: 535-1533
Hitachi Asia Ltd.
Taipei Branch Office
3F, Hung Kuo Building. No.167,
Tun-Hwa North Road, Taipei (105)
Tel: <886> (2) 2718-3666
Fax: <886> (2) 2718-8180
Hitachi Asia (Hong Kong) Ltd.
Group III (Electronic Components)
7/F., North Tower, World Finance Centre,
Harbour City, Canton Road, Tsim Sha Tsui,
Kowloon, Hong Kong
Tel: <852> (2) 735 9218
Fax: <852> (2) 730 0281
Telex: 40815 HITEC HX
Copyright ' Hitachi, Ltd., 1998. All rights reserved. Printed in Japan.
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