Sony CXA1998AQ Datasheet
CXA1998AQ
For the availability of this product, please contact the sales office.
Recording/Playback Equalizer Amplifier
Description
The CXA1998AQ is an IC developed for analog
signal processing in tape recorders. Processing for
both the recording and playback systems is
achieved on one chip.
Features
• 11-bit serial data interface
• Recording/playback mute function
• Recording equalizer Gp and Fp can be adjusted
externally.
• AGC (Automatic Gain Control)
• Comparator for AMS (Automatic Music Sensor)
• Recording/playback equalizer amplifier with 1.7
times speed switching
Structure
Bipolar silicon monolithic IC
Applications
All analog signal processing in the cassette decks
of tape recorders and compact music centers
48 pin QFP (Plastic)
Absolute Maximum Ratings (Ta = 25°C)
• Supply voltage VCC, VDD 12 V
• Operating temperature Topr –20 to +75 °C
• Storage temperature Tstg –65 to +150 °C
• Allowable power dissipation
PD 645 mW
Operating Conditions
Supply voltage VCC 6.5 to 10.0 V
VDD 4.5 to 5.5 V
Applicable Head
Applicable to MITSUMI ELECTRIC Co., Ltd.
Playback head: BP-7442-CP-6973
Recording/playback head: BC-9242-CB-9267
Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by
any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the
operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.
– 1 –
E96802A78
Block Diagram and Pin Configuration (Top View)
CXA1998AQ
IREF
PB OUT2
PB FB22
PB FB12
PB INB2
PB INA2
PB INA1
PB INB1
PB FB11
PB FB21
PB OUT1
FP CAL
37
38
39
40
41
42
43
44
45
46
47
48
RFS
2.8V
GND
GND
2.8V
36
210k
RFC
210k
1
35
GND
210k
210k
Vcc
GND
2
34
3
VG
33
GND
4
32
GND
IREF
MUTE
AGC IN2
31
10k
AGC
10k
5
AGC OUT2
REC IN2
30
RECEQ
40k
AGC GAIN 19.5dB
A EQ
AGC OFF
B EQ
40k
RECEQ
AGC GAIN 19.5dB
6
7
REC OUT2
29
GND
PBEQ CTL
RECEQ CTL
AMS
8
DGND
28
9
27
SPEED
GND
VDD
V
GND
DATA
XRESET
26
DECK A/B
SHIFT REGISTERS
D8
D10
D9
D11
20k20k
GND
DD
10
20k 20k
GND
11
CLK
25
VDD
D1
GND
D2
GND
D3
GND
D4
LATCHES
GND
D5
GND
D6
GND
D9
D11
GND
D7
12
24
23
22
21
20
19
18
17
16
15
GND
14
13
LATCH
V
DD
M2
M1
PL2
PL1
BPB
BPA
SPEED
RMUTE
RMUTEI
PBMUTE
GP CAL
A EQ
B EQ
AGC TC
AGC IN1
REC IN1
– 2 –
REC OUT1
AGC OUT1
AMS GND
AMS GAIN
AMS TC
AMS OUT
CXA1998AQ
Pin Description
Pin
No.
1
2
Symbol
GP CAL
A EQ
DC
voltage
I/O Equivalent circuit Description
1.2V —
—I
I/O
resistance
—
—
(Ta = 25°C, VCC = 8V, VDD = 5V, no signal, RESET ON)
Vcc
Vcc
Connects a resistor
for determining the
high-band peak gain
× 2
1
147
GND GND
VCC
147
2
30k
VCC
of recording equalizer.
Reference setting
resistance is 27kΩ.
Deck A equalizer
switch.
Low: 120µs EQ
High: 70µs EQ
3
4
B EQ
AGC TC
2.5V
(OPEN)
0.0V
—
GND
VCC
GND
CC
V
Deck B equalizer
switch.
147 50k
I
53kΩ
3
5k
5k
Low: NORMAL TAPE,
120µs EQ
Medium: Cro2 TAPE,
70µs EQ
High: METAL TAPE,
70µs EQ
GND
GND
—
VCC
× 2
× 2
147
500
500
200
4
× 2
5k
100k
VCC
× 4
200
Connects a resistor
and capacitor for
determining AGC
attack/recovery time
constants.
GND
– 3 –
GND
CXA1998AQ
Pin
No.
5
32
6
31
Symbol
AGC IN1
AGC IN2
REC IN1
REC IN2
DC
voltage
4.0V I
4.0V I
I/O Equivalent circuit Description
I/O
resistance
VCC
CC
V
AGC signal input.
Input resistance
changes between
50kΩ and 100kΩ.
AGC functions when
the signal of –30dBm
or more is input to
AGC for AGC ON.
(External 47µF//300kΩ
for Pin 4)
Recording equalizer
input.
50kΩ
50kΩ
32
5
GND
6
31
147 10k
VCC
GND
147
50k
40k
VGS
VGS
GND
× 4
V
CC
23186
1759
VGS
7
30
8
29
AGC OUT1
AGC OUT2
REC OUT1
REC OUT2
4.0V O AGC output.147Ω
4.0V O
147Ω
30
7
VCC
GND
8
29
VCC
147
× 2
× 4
147
× 3
500
× 10
500
500
GND
500
VGS
× 2
18752
107423
9945
V
CC
VGS
CC
V
40k
5p
Recording equalizer
output.
GND
– 4 –
GND
CXA1998AQ
Pin
No.
9
10
Symbol
AMS GAIN
AMS GND
DC
voltage
3.5V —
0.0V
I/O Equivalent circuit Description
I/O
resistance
VCC
10µ
VCC
Connects a resistor
for determining AMS
—
9
100k
147
signal detection level
and a capacitor for
determining HPF cutoff frequency.
——
GND
10
VccVcc
GND
AMS block ground.
GND
Vcc
11
12
AMS TC
AMS OUT
8.0V —
8.0V
O
—
—
Vcc
12
11
GND
GND
Vcc
147
GND
GND
1k
10k
Connects time
constant for AMS
detection.
Vcc
AMS output.
No signal detection:
High
Signal detection: Low
– 5 –
CXA1998AQ
Pin
No.
13
14
15
16
Symbol
PBMUTE
RMUTE1
RMUTE
SPEED
DC
voltage
5.0V —
5.0V
I/O Equivalent circuit Description
I/O
resistance
VDD
× 4
20k
20k
VDD
Connects a capacitor
for setting time
constant for playback
mute ON/OFF
switching.
—
13
14
147
GND
GND
Connects a capacitor
for setting time
constant for recording
mute ON/OFF
GND
switching.
Output for recording
VDD
VDD
mute ON/OFF switch
control signal. Outputs
D11 from Pin 26
(DATA).
× 4
O
—
15
16
GND
× 4
5k
20k
5k
Output for
recording/playback
equalizer speed switch
control signal. Outputs
D9 from Pin 26 (DATA).
Low: Normal Speed
GND
High: High Speed
(1.7 times)
17
18
19
20
21
22
23
BPA
BPB
PL1
PL2
M1
M2
VDD
5.0V O
5.0V
—
—
—
VDD
17
18
19
20
21
22
23
GND
× 4
GND
20k
× 4
10k
VDD
VDD
Outputs D6 from
Pin 26 (DATA).
Outputs D5 from
Pin 26 (DATA).
Outputs D4 from
Pin 26 (DATA).
Outputs D3 from
Pin 26 (DATA).
Outputs D2 from
Pin 26 (DATA).
Outputs D1 from
Pin 26 (DATA).
Power supply of serial
data interface block.
– 6 –
CXA1998AQ
Pin
No.
24
27
25
26
Symbol
LATCH
XRESET
CLK
DATA
DC
voltage
I/O Equivalent circuit Description
—I
—
I
I/O
resistance
—
—
27
24
25
26
GND
GND
× 4
× 4
GND
GND
2k
5p
10.5k
4k
10.5k
25µA
25µA
30k
30k
30k
30k
VDD
VDD
Serial data interface
latch input.
Serial data interface
reset input.
Low: Reset.
At this time serial
data outputs
(Pins 15 to 22)
are all open
(high).
Serial data interface
clock input.
Serial data interface
serial data input.
28
33
34
35
DGND
GND
VG
VCC
0.0V
0.0V
—
—
4.0V —
—
—
60kΩ
8.0V — Power supply.—
34
35
VCC
GND
28
33
147
× 2
45k
30k
30k
GND
GND
GND
× 2
× 4
V
500
500
CC
To each VGS
VCC
Serial data interface
block ground.
Ground.
Signal reference
voltage. Connects a
capacitor for ripple
rejection.
– 7 –
CXA1998AQ
Pin
No.
36
37
Symbol
RFC
IREF
48 FP CAL
DC
voltage
8.0V —
1.2V —
I/O Equivalent circuit Description
I/O
resistance
VCC
× 3
CC
V
Connects a resistor
and capacitor for
147
× 3
× 250
To each RFS
Vcc
obtaining stable
voltage with power
supply ripple rejected.
Connects a resistor
—
36
GND
Vcc
(12kΩ) for determining
equalizer gains.
× 2
—
37
48
147
5p
Connects a resistor for
determining the highband peak frequency
of recording equalizer.
GND
GND
Reference setting
resistance is 27kΩ.
38
47
39
46
PB OUT2
PB OUT1
PB FB22
PB FB21
2.8V O
2.8V —
147Ω
—
38
47
GND
39
46
Vcc
147
VCC
500
500
× 3
× 6
147
GND
× 3
15p
7k
× 3
× 4
Vcc
× 4
Playback equalizer
output.
RFS
2k2k
Connects a capacitor
for determining
playback equalizer
time constants, such
as 120µs and 70µs.
GND
– 8 –
GND GND
CXA1998AQ
Pin
No.
40
45
41
42
43
44
Symbol
PB FB12
PB FB11
PB INB2
PB INA2
PB INA1
PB INB1
DC
voltage
1.4V —
0.0V I
I/O Equivalent circuit Description
I/O
resistance
105kΩ
70kΩ
VCC
VCC
10k
5k
VCC
RFS
VCC
Playback equalizer
negative feedback.
1k
210k
× 2
1k
147
10p
210k
40
45
Playback equalizer
41
42
43
44
147
70k
× 6
30p
× 6
input.
GND
GND
GND
Note)
• AMS GND (Pin 10), DGND (Pin 28) and GND (Pin 33) are each independent in the IC and are not connected.
Be sure tp ground each of the ground pins listed above.
• The resistance of open collector outputs (Pins 15 to 22) can be connected Vcc.
– 9 –
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