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PDF HA12157NT Data sheet ( Hoja de datos )
| Número de pieza | HA12157NT | |
| Descripción | Audio Signal Processor for Cassette Deck (Dolby B/C-type NR with Recording System) | |
| Fabricantes | Hitachi Semiconductor | |
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HA12155NT/HA12157NT
Audio Signal Processor for Cassette Deck (Dolby B/C-type NR
with Recording System)
ADE-207-115C (Z)
4th Edition
June 1997
Description
HA12155NT/HA12157NT is silicon monolithic bipolar IC providing Dolby noise reduction system*,
electrical volume system, REC equalizer system and level meter system in one chip.
Functions
• REC equalizer
• Dolby B/C NR
• Electronic volume
• Level Meter
× 2 channel
× 2 channel
× 2 channel
× 2 channel
Features
• Inductor less REC equalizer is adjustable of its characteristics by external resistor
• Rec level is adjustable automatically with electrical volume which is built-in
• 3 type of input selection is available (one is by way of electrical volume)
• Separate input selection SW and REC/PB SW
• Dolby noise reduction with dubbing cassette decks
(Unprocessed signal output available from recording out terminals during PB mode)
• Log-compressed level meter output is range from 0 V to 5 V
(Usable as music search switchable gain of 0 dB and 20 dB respectivily)
• Normal-speed/high-speed (Double), normal/metal/chrome fully electronic control switching built-in
• NR-ON/OFF, Dolby B/C, MPX ON/OFF fully electronic control switching built-in
(Controllable from micro-controller directly)
• Reduction of number of pin by transfered serial data to electronic volume control switching and another
control switching
(Controllable from micro-controller directly)
• Low external parts count
1 page  
HA12155NT/HA12157NT
Electrical Characteristics (Ta = 25°C VCC = 14 V Dolby level 300 mVrms) (cont)
Item
Symbol
Volume mute
GVVR (MUT)
Max-input level to volume Vin max (VR)
Min
—
11.0
Typ
—
12.6
Max Unit
–80.0 dB
— dBs
Volume S/N
S/N (VR)
78.0 84.0 — dB
Volume THD
THD (VR)
— 0.04 0.3 %
Equalizer gain
GV EQ (500)
13.0 15.0 17.0 dB
G
V EQ (1K)
13.0 15.0 17.0
GV EQ (5K)
14.5 16.5 18.5
GV EQ (10K)
18.5 20.5 22.5
GV EQ (20K)
29.5 32.0 34.5
Equalizer maximum input Vin max (EQ) –8.0 –7.0 — dBs
Equalizer S/N
Equalizer THD
S/N (EQ)
THD (EQ)
57.0 62.0 —
— 0.2 0.5
dB
%
Equalizer offset
Level meter output
Level meter output
Vofs (EQ)
–400 0.0
LM (0 dB)
2.60 2.85
LM (12 dB) 3.60 3.90
LM (–20 dB)1 0.80 1.10
LM (–20 dB)2 2.55 3.0
+400 mV
3.10 V
4.20 V
1.40 V
3.15 V
Level meter offset
LMofs 1
— 150 300 mV
LMofs 2
— 200 350
Notes: 1. HA12155 V = 9.5 V, HA12157 V = 12 V
CC CC
2. 0 dB = PB-OUT level
Test conditions
Vin = 3 Vrms, f = 1 kHz
f = 1 kHz, THD = 1%,
V = 12 V
CC
Vin = 100 mVrms, f = 1
kHz, A-WTG
Vin = 100 mVrms, f = 1
kHz
Vin = 77.5 mVrms,
f = 500 Hz
Vin = 77.5 mVrms,
f = 1 kHz
Vin = 77.5 mVrms,
f = 5 kHz
Vin = 77.5 mVrms,
f = 10 kHz
Vin = 77.5 mVrms,
f = 20 kHz
f = 1 kHz, THD = 1%,
V = 12 V
CC
Rg = 5.1 kΩ, A-WTG
Vin = 77.5 mVrms,
f = 1 kHz
no signal
Vin = 0 dB, f = 1 kHz
Vin = 12 dB, f = 1 kHz
Vin = –20 dB, f = 1 kHz
Vin = –20 dB, f = 1 kHz,
–20 dB range
no signal
no signal, –20 dB range
Notes
*1
*2
*2
Rev.4, Jun. 1997, page 5 of 57
5 Page 
HA12155NT/HA12157NT
Pin Description (VCC = 14 V, Ta = 25°C, No signal, the value in the table show typical
value) (cont)
Pin No.
DP-64S
18
47
Terminal
name
HLS DET
Zin
—
DC
voltage
2.3 V
Equivalent circuit
Description
Time constant pin for
rectifier
19 LLS DET
46
57
BIAS
—
0.28 V
25
IREF
—
1.2 V
GND
Dolby NR Reference
current input
EQ Reference current
input
27 FM
28 fQ
29 f/Q
30 GH
31 GL
32 GP
EQ Parameter current
input
Rev.4, Jun. 1997, page 11 of 57
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet HA12157NT.PDF ] | |
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