HA12211NT
Audio Signal Processor for Cassette Deck (Deck 1 Chip)
ADE-207-223A (Z)
2nd. Edition
June 1997
Description
HA12211NT is silicon monolithic bipolar IC providing REC equalizer system, PB equalizer system and
each electronic control switch in one chip.
Functions
PB equalizer
2 channel
REC equalizer
2 channel
Each electronical control switch to change equalizer characteristics
REC mute
REC head return switch
Features
REC equalizer is very small number of external parts.(4 types of frequency characteristics built-in)
PB equalizer built-in. (A/B input changing system, 4 types of frequency characteristics)
Independent PB sensitivity for A deck, B deck.
Normal-speed/high-speed, normal tape/chrome tape switching built-in.
Controllable from direct micro-computer output.
Available to reduce substrate-area because of high integration and small external parts.
HA12211NT
Rev.2, Jun. 1997, page 2 of 34
Pin Description, Equivalent Circuit (V
CC
= 10.5V, Vref = 5.25V, 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
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
Reference
8
PB-IN A(L)
V = Vref
V
CC
V
PB A Deck input
9
PB-IN A(R)
HA12211NT
Rev.2, Jun. 1997, page 3 of 34
Pin Description, Equivalent Circuit (V
CC
= 10.5V, Vref = 5.25V, Ta = 25C, No signal,
The value in the table show typical value.) (cont)
Pin No.
Pin Name
Note
Equivalent Circuit
Pin Description
10
PB-NF (L)
V = Vref
V
CC
V
139k
PB EQ Feed back
11
PB-NF (R)
12
PB-EQ (L)
V = Vref
V
GND
NAB Output
13
PB-EQ (R)
14
PB-Cal A(L)
V = Vref
10k
7
Vref
V
V
CC
Feed back input
for gain
adjustment
15
PB-Cal A(R)
16
PB-Cal B(R)
17
PB-Cal B(L)
26
AUX (R)
V = Vref
100k
7
Vref
V
V
CC
REC-EQ input
27
AUX (L)
28
TAPE (R)
29
TAPE (L)
HA12211NT
Rev.2, Jun. 1997, page 4 of 34
Pin Description, Equivalent Circuit (V
CC
= 10.5V, Vref = 5.25V, Ta = 25C, No signal,
The value in the table show typical value.) (cont)
Pin No.
Pin Name
Note
Equivalent Circuit
Pin Description
18
PBOUT (R)
V = Vref
V
V
CC
GND
PB output
19
PBOUT (L)
20
A/B
I = 20
A
V
CC
GND
22k
100k
I
Mode control input
21
HSP
22
Acr
23
Bcr
24
REC-SEL
I = 20
A
V = 2.5V
V
CC
GND
50k
100k
I
V
Mode control input
25
IREF
V = 1.2V
V
Equalizer
reference current
input
30
GND
GND Pin
HA12211NT
Rev.2, Jun. 1997, page 5 of 34
Block Diagram
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
1
2
3
4
5678
9
10
11
12
13
14
15
REC IN
from logic
to Dolby
GND
TAPE(L
)
TAPE(R
)
AUX(L
)
AUX(R
)
IREF
REC-SEL
BCr
ACr
HSP
A/
B
PB-OUT(L
)
PB-OUT
(R
)
PB-CAL
B
( L
)
B
( R
)
PB-CAL
L-ch
R-ch
L-ch
R-ch
REC-EQ
12dB
B
A
139k
5k
2.
7k
2.26k
1
.
12k
+
+
A
B
10k
REC-OUT(L
)
REC-OUT(R
)
V
CC
REC-RETURN
B
( L
)
B
( R
)
PB-IN
PB-IN
5.6k
5.6k
470
470
Bias
470
+
VREF
PB-IN
PB-IN
PB-NF
A
( L
)
A
( R
)(
L
)
PB-NF
( R
)
470
4
70
0.
0
2
2
0
.022
PB-EQ
PB-EQ
( L
)(
R
)
A
( L
)
A
( R
)
PB-CAL
PB-CAL
R
B
: 100kB
R
B
: 100kB
GND
V
CC
Unit
R
:
C : F
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