HA12203NT/HA12204NT
Audio Signal Processor for Cassette Deck
(Dolby B-type NR with Recording System)
ADE-207-222B
Target Specification
3rd Edition
Jun. 1999
Description
HA12203NT is silicon monolithic bipolar IC providing Dolby noise reduction system* , music sensor
system, REC equalizer system and each electronic control switch in one chip.
Note: 1. 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
Functions
•
Dolby B - NR*
•
REC equalizer
•
Music sensor
•
Pass amp.
2
×
2 channel
×
2 channel
×
1 channel
×
2 channel
•
Each electronic control switch to change REC equalizer, bias, etc.
Note: 2. HA12204NT is not built-in Dolby noise reduction system.
Features
•
REC equalizer is very small number of external parts and have 6 types of frequency characteristics
3
built-in.*
•
2 types of input for PB, 1 type of input for REC.
•
70µ - PB equalizer changing system built-in.
•
Dolby NR with dubbing double cassette decks.
Unprocessed signal output available from recording out terminals during PB mode.
•
Provide stable music sensor system, available to design music sensing time and level.
•
Controllable from direct micro-computer output.
•
Bias oscillator control switch built-in.
•
NR ON / OFF and REC / PB fully electronic control switching built-in.
•
Normal-speed / high-speed, Normal / Crom / Metal* and PB equalizer fully electronic control
switching built-in.
3
•
Available to reduce substrate-area because of high integration and small external parts.
HA12203NT/HA12204NT
Note: 3. HA12204NT have 4 types of frequency characteristics.
Ordering Information
Standard Level
PB-OUT
Product
HA12203NT
HA12204NT
Package
DP-42S
Level
580mVrms
REC-OUT
Level
300mVrms
Dolby
Level
300mVrms
—
Operating Voltage Range
V
CC
(V)
+6.0 to +7.5
V
EE
(V)
–7.5 to –6.0
Note
|
V
CC
+ V
EE
|
< 1.0V
Function
Dolby
B-NR
!
Music
Sensor
!
!
Product
HA12203NT
HA12204NT
REC-EQ
!
!
Pass Amp.
!
!
REC / PB
!
!
Selection
!
!
Note: Depending on the employed REC / PB head and test tape characteristics, there is a rare case that
the REC-EQ characteristics of this LSI can not be matched to the required characteristics because of
built-in resistors which determined the REC-EQ parameters in this case, please inquire the
responsible agent because the adjustment built-in resistor is necessary.
Rev.3, Jun. 1999, page 2 of 97
HA12203NT/HA12204NT
Pin Description, Equivalent Circuit
(V
CC
= ±7 V, Ta = 25ºC, No Signal, The value in the show typical value.)
Pin No. Terminal Name
2
AIN (R)
Note
V = GND
Equivalent Circuit
Pin Description
PB A Deck input
V
100k
GND
41
4
39
6
37
10
33
7
AIN (L)
BIN (R)
BIN (L)
RIN (R)
RIN (L)
EQIN (R)
EQIN (L)
DET (R)
V = V
EE
+2.7V
V
CC
V = GND
PB B Deck input
V = GND
REC input
V = GND
REC equalizer input
Time constant pin
for Dolby-NR
V
V
EE
36
5
DET (L)
BIAS1
V = V
EE
+0.6V
Dolby bias current
input
V
V
EE
38
BIAS2
V = V
EE
+1.3V
REC equalizer bias
current input
V
V
EE
Rev.3, Jun. 1999, page 3 of 97
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