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PDF HA12134A Data sheet ( Hoja de datos )
| Número de pieza | HA12134A | |
| Descripción | Dolby B-Type Noise Reduction System | |
| Fabricantes | Hitachi Semiconductor | |
| Logotipo |  |
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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.
1 page  
HA12134A, HA12135A, HA12136A
Electrical Characteristics (Ta = 25°C, VCC = 12 V, Unless otherwise specified.) (cont)
Item
Offset voltage
V 8 (9) (NR-ON) –
V 8 (9) (NR-OFF)
Symbol Min Typ Max Unit Test conditions
∆Vorec –50 0.0
50
mV REC mode
V = 16.0 V
CC
Test Circuit
R10
10k
SW9 P
R
C11
+
0.68µ
C1+2
To Vcc
SW8
REC
PB
R9 R8
18k 22k
SW1
OFF ON
AUDIO SG
HP339A or
EQUIVALENT
R11 1µ 16 15 14 13 12
5.1k
REC GND PB IN BIAS REC/
IN PB
11
PB
OUT
L
SW2
R
R1
5.1k
REC
IN
C1 1
+
R 1µ
SW3
P
C2
+
R2 0.68µ
10k OFF
NR PB
Vcc PB IN VREF ON/OFF OUT
23
C3
+ 100µ
4 C13 5
C4 + +
R3
1µ 22µ
22k
6
ON OFF
ON SW4
SW10
R7
C9+ 10k
C10
0.22µ
10µ P SW7
C8
+
R
10
DET
9 10µ
REC
OUT
R6
10k
SW6
REC
DET OUT
7
8
C7
+
C5
R5
0.22µ 10µ R
C6 P
+
SW5
10µ R4
10k
AC VOLT
METER
HP 400E or
EQUIVALENT
DISTORTION
ANALYZER
HP339A or
EQUIVALENT
OSCILLOSCOPE
TEKTRO 475 or
EQUIVALENT
NOISE METER
WITH CCIR/
ARM FILTER
DC POWER
SOURCE
Notes: 1. Resistor tolerances are ±1%
2. Capacitor tolerances are ±1%
3. Unit R: Ω C: F
Rev.3, Jun. 1999, page 5 of 27
5 Page 
HA12136A
0
HA12134A, HA12135A, HA12136A
–10
–20
NR–ON
–30
NR–OFF
–40
100 200
400 1 k 2 k
Frequency [Hz]
4 k 6 k 10 k
Figure 7 REC Mode Ripple Rejection Ratio vs. Frequency
20 k
HA12136A
–10
–20
–30
NR–OFF
–40
NR–ON
–50
100 200
400 1 k 2 k
Frequency [Hz]
4k
10 k
Figure 8 PB Mode Ripple Rejection Ratio vs. Frequency
20 k
Rev.3, Jun. 1999, page 11 of 27
11 Page | ||
| Páginas | Total 27 Páginas | |
| PDF Descargar | [ Datasheet HA12134A.PDF ] | |
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