HA12134A, HA12135A, HA12136A
Dolby B-Type Noise Reduction System
ADE-207-016A
2nd. Edition
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 trade mark of Dolby Laboratories Licensing Corporation.
A license from Dolby Laboratories Licensing Corporation is required for the use of this IC.
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HA12134A, HA12135A, HA12136A
Absolute Maximum Ratings
(Ta = 25°C, Unless otherwise specified.)
Item
Supply voltage
Power dissipation
Operating temperature
Storage temperature
Lead temperature
Note:
1. Soldering 10 sec.
Symbol
Vccmax
Pd
Topr
Tstg
TI
Rating
16
250
–40 to +85
–55 to +125
260
Unit
V
mW
°C
°C
°C
Note 1
Ta
≤
85 °C
Note
3
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HA12134A, HA12135A, HA12136A
Electrical Characteristics
(Ta = 25°C, V
CC
= 12 V, Unless otherwise specified.)
Item
Symbol
Min
6.5
8.0
9.5
I
Q
HA12134A G
VIA
HA12135A
HA12136A
NR encode boost
V 8 (9) (NR ON)
V 8 (9) (NR OFF)
—
21.0
24.5
26.5
ENC-1.4 2.9
k (1)
ENC-1.4 6.0
k (2)
ENC-5 k 1.7
(1)
ENC-5 k 6.7
(2)
ENC-10 k –1.1
(1)
ENC-10 k 9.8
(2)
T.H.D (REC)
Signal handling
T.H.D
(REC)
HA12134A Vomax
HA12135A (REC)
HA12136A
Signal/noise ratio
(REC)
Crosstalk (ENC)
(Pin 8 – Pin 9)
Control voltage for
REC/PB
S/N
(REC)
62.0
68.0
—
dB
Rg = 5.1 kΩ
weighted
CCIR/ARM
f = 1 kHz
NR OFF
—
12.0
Typ
12.0
12.0
12.0
7
23.0
26.5
28.5
4.4
7.5
3.2
8.2
0.4
10.4
0.05
13.0
Max
16.0
16.0
16.0
—
25.0
28.5
30.5
5.9
9.0
4.7
9.7
1.9
11.8
0.3
—
dB
dB
dB
dB
dB
dB
%
dB
mA
dB
No signal, REC NR-ON
Pin 1→Pin 6
(Pin 16→Pin 11)
Vout = 0 dB, f = 1 kHz
f = 1.4 kHz
V 8 (9) (NR OFF) = –20 dB
f = 1.4 kHz
V 8 (9) (NR OFF) = –30 dB
f = 5 kHz
V 8 (9) (NR OFF) = –20 dB
f = 5 kHz
V 8 (9) (NR OFF) = –30 dB
f = 10 kHz
V 8 (9) (NR OFF) = 0 dB
f = 10 kHz
V 8 (9) (NR OFF) = –40 dB
f = 1 kHz
V 8 (9) (NR ON) = 0 dB
f = 1 kHz,
T.H.D = 1%
V
CC
= 6.5 V
V
CC
= 8.0 V
V
CC
= 9.5 V
Unit
V
Test conditions
Enable functional operations
Operating voltage HA12134A Vope
HA12135A
HA12136A
Quiescent current
Voltage gain of
input amp
CT R→L 52.0
L→R
REC
2.5
60.0
—
—
V
CC
dB
V
PB
Control voltage for
NR ON/OFF
ON
0.0
2.5
—
—
0.5
V
CC
V
OFF
Channel balance
∆G
VIA
0.0
–1.0
—
0.0
0.5
1.0
dB
4
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HA12134A, HA12135A, HA12136A
Electrical Characteristics
(Ta = 25°C, V
CC
= 12 V, Unless otherwise specified.) (cont)
Item
Offset voltage
V 8 (9) (NR-ON) –
V 8 (9) (NR-OFF)
Symbol
∆Vorec
Min
–50
Typ
0.0
Max
50
Unit
mV
Test conditions
REC mode
V
CC
= 16.0 V
Test Circuit
5
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