Sony CXA1898Q Datasheet
Recording/Playback Equalizer Amplifier
Description
The CXA1898Q 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
• Recording equalizer Gp and Fp can be adjusted
externally.
• Recording mute function
• AGC (Automatic Gain Control)
• Comparator for AMS (Automatic Music Sensor)
• Recording/playback equalizer amplifier with
1.7 times speed switching
• 11-bit serial data interface
Absolute Maximum Ratings
• Supply voltage VCC 12 V
• Operating temperature Topr –20 to +75 °C
• Storage temperature Tstg –65 to +150 °C
• Allowable power dissipation PD 735 mW
Structure
Bipolar silicon monolithic IC
Applications
All analog signal processing in the cassette decks
of tape recorders and compact music centers
(Applicable to Sankyo Seiki mfg. Co., Ltd.
equivalent)
CXA1898Q
48 pin QFP (Plastic)
YK47R-KF202 R/P head or
Operating Conditions
Supply voltage VCC 6.5 to 10.0 V
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 –
E94329B78
Block Diagram and Pin Configuration (Top View)
CXA1898Q
IREF
PB OUT2
PB FB22
PB FB12
PB INB2
PB INA2
PB INA1
PB INB1
37
38
39
40
41
42
43
44
GND
210k
GND
GND
GND
GND
GND
GND
GND
GND
CC
RFC
36
V
35
210k
70k
70k
70k
70k
VG
34
IREF
GND
33
GND
AGC TC
32
AGC IN2
31
10k
40k
AGC
REC IN2
30
AGC OFF
D8
AGC OUT2
29
AGC GAIN 19.5dB
RECEQ
CTL
PBEQ
CTL
RECEQ
REC OUT2
28
DECK A/B
D10
SPEED
D9
B EQ
A EQ
D GND
27
GND
XRESET
26
SHIFT REGISTERS
DATA
25
CLK
24
LATCH
23
M2
22
D1
GND
D2
GND
D3
GND
D4
LATCHE S
GND
D5
GND
D6
M1
21
PL2
20
19
PL1
18
BPB
BPA
17
PB FB11
PB FB21
PB OUT1
AMS GAIN
45
210k
1
AMS
GND
AMS FIL
210k
MUTE
2
3
AMS OUT
4
AMS GND
5
FP CA L
GP CAL
GND
46
47
48
40k
AGC GAIN 19.5dB
10k
6
7
AGC IN1
REC IN1
8
AGC OUT1
SPEED
B EQ
RECEQ
D8
D10
D9
9
10
REC OUT1
A EQ
11
B EQ
D7
D9
D11
D11
12
GND
GND
GND
GND
GND
RMUTE1 I
16
15
14
13
PB MUTE
SPEED
R MUTE2
R MUTE1
– 2 –
Pin Description
CXA1898Q
Pin
No.
6
31
7
30
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
50kΩ
50kΩ
31
6
VCC
GND
7
30
147 3k
VCC
GND
147
50k
47k
VGS
VGS
× 4
V
GND
CC
VGS
V
23k
1.8k
CC
AGC signal input.
Input resistance
changes between
47kΩ and 3kΩ
Recording equalizer
input.
8
29
9
28
AGC OUT1
AGC OUT2
REC OUT1
REC OUT2
4.0V O
4.0V
VCC
× 2
147
147Ω
O
147Ω
8
29
GND
VCC
9
28
GND
500
500
× 4
GNDGND
× 3
500
147
× 10
GND
18.8k
47.8k
5.3k
VGS
× 2
500
V
CC
AGC output pin.
AGC is applied at
–11dBm or more.
VGS
V
CC
40k
5p
Recording equalizer
output.
– 3 –
CXA1898Q
Pin
No.
10
11
Symbol
A EQ
B EQ
DC
voltage
I/O Equivalent circuit Description
—I
2.5V
(when
I
open)
I/O
resistance
—
53kΩ
11
10
VCC
VCC
147
GND
147 50k
VCC
A deck equalizer
switch.
Low: 120µs EQ
High: 70µs EQ
GND
V
CC
B deck equalizer switch.
Low: Normal Tape,
5k
5k
120µs EQ
High: CrO2 Tape, 70µs
EQ
Medium: Metal Tape,
70µs EQ
12
13
14
15
16
RMUTE1 I
R MUTE1
R MUTE2
SPEED
PB MUTE
—I
5.0V
(when
reset)
(when
Pin 25
O
(DATA)
is set to
high)
—
—
VDD
GND
12
13
14
15
16
VCC
GND
GND
147
× 4
GND
GND
× 2
GND
5k
20k
20k
× 4
50µA
20k
× 2
5k
VCC
2.7V
Recording mute
ON/OFF switch.
Low: Mute OFF
High: Mute ON
∗
Fader function is
realized by the
external time
constant circuit.
Connects Pin 13
(RMUTE1).
Output for recording
mute ON/OFF switch
control signal.
Outputs D11 from Pin
25 (DATA).
VCC
Output for recording/
playback equalizer
speed switch control
signal. Outputs D9 from
Pin 25 (DATA).
Low: Normal Speed
High: High Speed
(1.7 times)
Output pin for playback
mute ON/OFF switch
control signal. Outputs
D7 from Pin 25 (DATA).
Connects a resistor to
VDD for Pins 13 to 16.
– 4 –
CXA1898Q
Pin
No.
17
18
19
20
21
22
23
26
Symbol
BPA
BPB
PL1
PL2
M1
M2
LATCH
XRESET
DC
voltage
I/O Equivalent circuit Description
5.0V
(when
reset)
(when
Pin 25
O
(DATA)
is set to
high)
—I
I/O
resistance
—
—
VDD
23
26
17
18
19
20
21
22
GND
× 4
GND
GND
× 4
GND
20k
2k
5p
10.5k
25µA
× 4
10k
100µA
24k
Outputs D6 from
VCC
Pin 25 (DATA).
Outputs D5 from
Pin 25 (DATA).
Outputs D4 from
Pin 25 (DATA).
Outputs D3 from
Pin 25 (DATA).
Outputs D2 from
Pin 25 (DATA).
Outputs D1 from
Pin 25 (DATA).
Serial data interface
VCC
latch input.
Serial data interface
reset input.
Low: Reset.
At this time
serial data
outputs
(Pins 13 to 22)
are all open
(high).
24
25
32
CLK
DATA
AGC TC
—I
0.0V
—
—
—
24
25
GND
32
× 4
GND
VCC
GND
× 2
200
147
4k
10.5k
× 2
25µA
500
500
× 2
100k
GND
5k
VCC
100µA
24k
× 4
200
VCC
Serial data interface
clock input.
Serial data interface
serial data input.
Connects a resistor and
capacitor for
determining AGC
attack/recovery time
constants.
– 5 –
CXA1898Q
Pin
No.
34
35
36
Symbol
VG
VCC
RFC
DC
voltage
4.0V —
8.0V
8.0V —
I/O Equivalent circuit Description
—
I/O
resistance
60kΩ
—
34
35
VCC
GND
VCC
× 2
147
45k
30k
30k
× 3
GND
× 2
500
500
× 4
CC
V
Signal reference
voltage. Connects a
To
each
capacitor for ripple
VSG
rejection.
CC
V
Power supply.
CC
V
Connects a resistor
and capacitor for
—
36
147
× 3
× 250
obtaining stable
voltage with power
supply ripple rejected.
38
47
PB OUT2
PB OUT1
2.8V
To each RFS
GND
V
VCC
× 3
500
38
O
147Ω
47
147
× 6
GND
GND
500
5p
5k
× 2
CC
Playback equalizer
× 2
output.
– 6 –
CXA1898Q
Pin
No.
39
46
40
45
41
42
43
44
Symbol
PB FB22
PB FB21
PB FB12
PB FB11
PB INB2
PB INA2
PB INA1
PB INB1
DC
voltage
2.8V —
1.4V —
0.0V I
I/O Equivalent circuit Description
I/O
resistance
—
39
46
VCC
147
× 3
7k
× 3
× 4
× 4
RFS
2k2k
Connects a capacitor
for determining
playback equalizer
time constants, such
as 120µs and 70µs.
105kΩ
70kΩ
GND
VCC
VCC
10k10k
41
42
43
44
GND
147
70k
× 6
× 6
GND
GND GND
VCC
RFS
VCC
1k
210k
1k
5p
× 2
147
210k
GND
Playback equalizer
negative feedback.
40
45
Playback equalizer
input.
VCC
10µ
VCC
Connects a resistor
for determining AMS
48
AMS GAIN
3.5V
—
—
48
100k
147
signal detection level
and a capacitor for
determining HPF
cut-off frequency.
GND
GND
Note)
The resistance of open collector outputs (Pins 2 and 13 to 22) can be also connected to VCC.
– 7 –
Electrical Characteristics
(Ta = 25°C, VCC = 8.0V, VDD = 5.0V, refer to Electrical Characteristics Measurement Circuit)
CXA1898Q
Item
Operating voltage
Current consumption
AGC ON output level
AGC ON channel
balance
AGC
AGC ON distortion
AGC OFF output
level
No signal detection
threshold level
AMS
120µs–NS
frequency response
120µs–NS
frequency response
70µs–NS
frequency response
120µs–HS
frequency response
Measurement conditions Min. Typ. Max. Unit
VCC
NORM–NS, VCC = 8V, No signal
Pin 32 external R300kΩ/ /C47µF
f = 1kHz, Vin = –25dBm
Pin 32 external R300kΩ/ /C47µF
f = 1kHz, Vin = –15dBm
Pin 32 external R300kΩ/ /C47µF
f = 1kHz, Vin = 0dBm
Pin 32 external R300kΩ/ /C 47µF
f = 1kHz, Vin = –25dBm
Pin 48 external R9.1kΩ, C0.015µF
Pin 1 external R100kΩ/ /C0.1µF
f = 5kHz, 0dB = –21dBm
(at PBEQ reference output level)
f = 315Hz, Vin = –70dBm
Reference for frequency response
f = 2.7kHz, Vin = –58.5dBm
at 120µs–NS, 315Hz
f = 4.5kHz, Vin = –53.8dBm
at 120µs–NS, 315Hz
f = 5.3kHz, Vin = –52.5dBm
at 120µs–NS, 315Hz
6.5
13.5
–13.0
–2.0
—
–7.5
–11.5
–23.0
–0.1
–0.1
1.8
8.0
18.0
–11.0
0.0
0.3
–5.5
–8.2
–21.0
1.3
1.7
3.0
10.0
22.5
–9.0
2.0
1.5
–3.5
—
–19.0
2.9
2.9
4.8
V
mA
dBm
dB
%
dBm
dB
dBm
dB
70µs–HS
frequency response
Signal handling
Total harmonic
Playback equalizer amplifier block
distortion
S/N ratio
Output offset voltage
f = 9.1kHz, Vin = –47.8dBm
at 120µs–NS, 315Hz
120µs–NS, RL = 2.7kΩ
f = 1kHz, THD + N = 1%
120µs–NS, RL = 2.7kΩ
f = 1kHz, Vin = –56.4dBm
120µs–NS, Rg = 2.2kΩ
"A" weighting filter
120µs–NS, Rg = 70kΩ
2.1
–10.0
—
55.0
2.4
3.6
–6.0
0.3
62.0
2.7
5.1
—
0.7
—
3.2
dBm
%
dB
V
– 8 –
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