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PDF HA12203NT Data sheet ( Hoja de datos )
| Número de pieza | HA12203NT | |
| Descripción | Audio Signal Processor for Cassette Deck(Dolby B-type NR with Recording System) | |
| Fabricantes | Hitachi Semiconductor | |
| Logotipo |  |
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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*1, 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.
Functions
• Dolby B - NR*2 × 2 channel
• REC equalizer × 2 channel
• Music sensor × 1 channel
• Pass amp.
× 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
built-in.*3
• 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*3 and PB equalizer fully electronic control
switching built-in.
• Available to reduce substrate-area because of high integration and small external parts.
1 page  
Pin No. Terminal Name Note
12 A / B
I = 50µA
Equivalent Circuit
V
22 k
HA12203NT/HA12204NT
Pin Description
I Mode control input
100 k
13 A120 / 70
14 NORM / HIGH
15 B NORM / CROM
/ METAL
16 BIAS ON / OFF
17 RM ON / OFF
18 NR ON / OFF
20 LM ON / OFF
19 REC / PB / PASS
GND
2.5 V
+
–
21 MSOUT
I = 0µA
V
100 k
100 k
V 22 k
VCC
I
Mode control input
MS output
(to MPU)*1)
GND
30 GPCAL
V = GND
110 k
V
31 RECCAL
V = GND
VEE
GP gain Calibration
terminal
2.5 V
REC gain calibration
terminal
Rev.3, Jun. 1999, page 5 of 97
5 Page 
Input Block Diagram and Level Diagram
HA12203NT/HA12204NT
The each level shown above is typical value MS
when offering PBOUT level to PBOUT pin.
REF
300mVrms
PASS
REC
PB PB/REC,
PB=5.7dB/5.7dB
PBOUT
580mVrms
FLAT
AIN (120µ)
300mVrms
21.3dB
PB
0dB
BIN 25.9mVrms
70µs
REC
300mVrms
DOLBY
B-NR
RECOUT
300mVrms
R3
12k
R4
15k
PASS PB/REC,
PASS=0dB/17dB
42.4mVrms
C2 RIN HA12204NT is not built-in Dolby noise reduction system.
0.0047µF
Figure 2 Input Block Diagram
PB Equalizer
By switching logical input level of 13 pin (for Ain) and 15 pin (for Bin), you can equalize corresponding to
tape position at play back mode.
With the capacity C2 capacitance that we showed for figure 2 70 µs by the way figure seem to 3 they are
decided.
Gv
t1 t2
t1 = C2 • (12k + 15k)
t2 = C2 • 15k
f
Figure 3 Frequency Characteristic of PB Equalizer
Rev.3, Jun. 1999, page 11 of 97
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet HA12203NT.PDF ] | |
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