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UD-300
CIRCUIT DESCRIPTION
Audio Signal Processing System IC for Cassette Deck (HA12157NT)
The HA12157NT is an audio signal processing LS/ chip
integrates
potentiometers,
recording
equalizers,
level
meters, and Dolby noise reduction systems on one chip.
REC
ee
aout
Pal
w
{0 GND
NAIN
Veet
PS OUT
mM
()
vAL
CNT
RPI
ma
te
Ww
GNO
(yy
eUelveme
STB
DATA
| CuK
64)—s)
BIAS
62,
66)
ow
OUTIL)
Ly
OuTi)
sega as
IN(L)
t a
SHIFT
REGISTER} 4
6BIT
|
j
DAC
5 {>
no Ne
+
4
d
!
1
4
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ih rice afi |
Pel
INS OUT
(R)
(R)
NR
ON/OFF
C8
MPX
VK
ON/OFF
vRi
{R)
CNT
RPL
(R)
AR)
REF
Es Veet PROUT
(R}
(RY
(RD
Function
Mode Control input
Power Supply
DOLBY
B/C NR
pl 6
DOLBY
B/C NR
Lod
SER
Tae iRaaT
Li y |
REC
wie
Our{A)
REC OUT
6-0-0606
O9--
GNO
EQ
(2 OUTIL)
FQ
Init)
NC
@-0-0-@
tre
Penna
nnn
weSshrdeq ses eectsetesselsce
Recording (Encode) output
Level meter input
Volume input
Time constant pin forlevel meter
DAC output Volume control input
Level meter output
Recording input
Equalizer input
Ripple filter
EQ reference current input
Playback input
Equalizer output
Injection current input for ILL
Input amplifier output
Noise reduction processor input
EQ parameter currentinput
Reference voitage buffer output
Playback (Decode) output
Spectral skewing amplifier input
EQ parameter selector
Spectral skewing amplifier output
Current controlled resistor output
Ground
Digital (Logic) ground
HLS DET
Time constant pin for rectifier
LLS DET
Dolby NR reference curen t input |
| Mode control input
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