HA12207NT
Audio Signal Processor for Cassette Deck
ADE-207-197B (Z)
3rd Edition
Jun. 1999
Description
HA12207NT is silicon monolithic bipolar IC providing PB equalizer, REC equalizer system and each
electronic control switch in one chip.
Functions
PB equalizer
2 channel
REC equalizer
2 channel
Each electronic control switch to change REC/PB etc.
REC MUTE
REC head return switch
Features
REC equalizer is very small number of external parts, built-in 2 types of frequency characteristics.
PB equalizer circuit built-in.
REC /PB of high speed mode are possible with TYPE 1(Normal tape).
Controllable from direct micro-computer output.
Available to reduce substrate-area because of high integration and small external parts.
As the pins arrangement resembles HA12185NT, it can design the board that is replaced with
HA12185NT.
HA12207NT
Rev.3, Jun. 1999, page 2 of 27
Pin Description, Equivalent Circuit (V
CC
= 10.5V, Vref = 5.6V, Ta = 25C, No signal,
The value in the table show typical value.)
Pin No.
Pin Name
Note
Equivalent Circuit
Pin Description
1
V
CC
V = V
CC
V
CC
pin
2
RECOUT (L)
V = Vref
V
CC
GND
REC-EQ output
3
RECOUT (R)
4
REC-RETURN
V = Vref
V '= Vref
GND
V'
V
CC
I
I
V
4
5 pin, 6 pin
REC return
5
PB-IN B (L)
PB B Deck input
6
PB-IN B (R)
7
VREF
V = Vref
V' = V
CC
/ 2
V
CC
GND
V'
10k
10k
V
+
PB-IN
Reference
8
PB-IN A (L)
V = Vref
V
CC
V
PB A deck input
9
PB-IN A (R)
HA12207NT
Rev.3, Jun. 1999, page 3 of 27
Pin Description, Equivalent Circuit (V
CC
= 10.5V, Vref = 5.6V, Ta = 25C, No signal,
The value in the table show typical value.)
Pin No.
Pin Name
Note
Equivalent Circuit
Pin Description
10
PB-NF (L)
PB-IN = Vref
V
CC
PB-IN
330k
7
180
PB EQ feed back
11
PB-NF (R)
12
PB-EQ (L)
PBOUT = Vref
PBOUT
GND
NAB output
13
PB-EQ (R)
20
REC IN (R)
V = Vref
100k
7
Vref
V
V
CC
REC-EQ input
21
REC IN (L)
14
PBOUT (R)
V = Vref
V
CC
GND
PB output
15
PBOUT (L)
HA12207NT
Rev.3, Jun. 1999, page 4 of 27
Pin Description, Equivalent Circuit (V
CC
= 10.5V, Vref = 5.6V, Ta = 25C, No signal,
The value in the table show typical value.)
Pin No.
Pin Name
Note
Equivalent Circuit
Pin Description
16
A
/B
I = 20
A
V
CC
GND
22k
100k
I
Mode control input
17
HSP
18
MUTE
19
IREF
V = 1.9V
V
Equalizer
reference current
input
22
GND
GND pin
HA12207NT
Rev.3, Jun. 1999, page 5 of 27
Block Diagram
22
21
20
19
18
17
16
15
14
13
12
12
3
4
5
6
7
8
9
GND
REC-IN(L
)
R-ch
L-ch
R-ch
REC-EQ
12dB
+
A
B
REC-OUT(L
)
V
CC
B
( L
)
B
( R
)
5.6k
5.6k
Bias
470
+
VREF
A
( L
)
A
( R
)(
L
)(
R
)
GND
V
CC
Unit
R :
C : F
10
60
120
L-ch
11
REC-IN(R
)
IREF
HSP
/B
PB-OUT(L
)
PB-OUT(R
)
( L
)(
R
)
PB-EQ
PB-EQ
PB-NF
PB-NF
PB-IN
PB-IN
PB-IN
PB-IN
REC-OUT(R
)
REC-RETURN
0.01
0.01
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