Dolby B-Type Noise Reduction
Description
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 HA12134A HA12134AF HA12135A HA12135AF HA12136A HA12136AF 580 450 Dolby Level (mVrms) 300 Package DP-16 FP-16DA DP-16 FP-16DA DP-16 FP-16DA
Block Diagram
REC IN GND PB IN BIAS
18 k 22 k
REC/PB PB OUT
DET
REC OUT
0.
22 µ
16
15
14
13
12
11
10
9
SW BIAS SW
BUF AMP
SIDE CHAIN
BUF AMP
SIDE CHAIN
1
2
3
4
+ 1µ + 22 µ
5
22 k
6
7
0.
22 µ
8
REC IN
V CC
PB IN
V REF NR ON/OFF
PB OUT
DET
REC OUT
Rev.
3, Jun.
1999, page 2 of 27
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
Rev.
3, Jun.
1999, page 3 of 27
HA12134A, ...
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