Description
The CXA1498S/M is a bipolar IC designed as
equalizer amplifier for tape redorder recording/
playback. This IC is particularly well-suited for double
cassette deck applications. An on-chip filter serves to
greatly reduce the number of external parts.
Features
Recording equalizer amplifier
2
(Monolithic filter eliminates the need for external
resonance circuit)
AGC (automatic gain control)
2
Playback equalizer amplifier
2
(Variable resistor eliminates the need for external
feedback resistor)
Electronic switch for playback head
(Changes between A and B decks)
Electronic switch for tape equalization
(120s/70s) (Independently for A and B decks)
Electronic switch for metal tapes
Electronic switch for normal/high speed dubbing
(Effective for both REC EQ and PB EQ)
Recording mute function
(Soft mute is possible through use of an external
time constant circuit)
DC controllable for fade IN/OUT
(Controls recording mute function)
Playback mixing output pin provided
(For tune selection)
Use of this IC simplifies the construction of double
cassette dubbing system
Block Diagram and Pin Configuration (Top View)
Applications
Recording/playback equalizer amplifier, playback
mixing amplifier and AGC for analog stereo tape
recorders
Structure
Bipolar silicon monolithic IC
Absolute Maximum Ratings (Ta = 25C)
Supply voltage
V
CC
12
V
Operating temperature
Topr
20 to +75
C
Storage temperature
Tstg
65 to +150
C
Allowable power dissipation
P
D
SDIP
930
mW
SOP
630
mW
Recommended Operating Condition
Supply voltage
V
CC
4.5 to 10.0
V
1
CXA1498S/M
E91860C49-ST
Recording/Playback Equalizer Amplifier for Stereo Tape Recorder
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.
CXA1498S
30 pin SDIP (Plastic)
CXA1498M
30 pin SOP (Plastic)
REC EQ
CONTROL
PB IN1 (L)
PB IN2 (L)
PB FB1 (L)
PB FB2 (L)
PB OUT (L)
MS OUT
I REF
SPEED
DECK B EQ
METAL
AGC TC
AGC (L)
REC IN (L)
GND
REC OUT (L)
PB IN1 (R)
PB IN2 (R)
PB FB1 (R)
PB FB2 (R)
PB OUT (R)
RFS
RFC
DECK A/B
DECK A EQ
REC MUTE
VG
AGC (R)
REC IN (R)
V
CC
REC OUT (R)
PB EQ
CONTROL
MUTE
CONT
REC EQ
REC EQ
PB FB1
PB FB2
100k
210k
DECK
A/B
DECK- A
DECK- B
PB IN2
PB IN1
PB
OUT
DECK
A/B
210k
100k
PB FB1
PB FB2
PB IN2
PB IN1
DECK- A
DECK- B
I REF
SPEED
DECK
-B EQ
METAL
AGC
GND
REC
OUT
RFS
RFC
DECK
A/B
DECK
-A EQ
REC
MUTE
VG
AGC
REC
IN
V
CC
REC
OUT
MS
OUT
PB
OUT
AGC
TC
REC
IN
BIAS &
I REF
30k
30k
AGC DET
VGS
V
CC
GND
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
2
3
4
5
6
7
8
9
10
11
12
13
14
15
1
PB
PB
2
CXA1498S/M
Pin Description and Equivalent Circuit
(Ta = 25C, V
CC
= 8V, no signal)
Pin
No.
Symbol
DC
voltage
I/O
I/O
resistance
Equivalent circuit
Description
1
2
29
30
PBIN1 L
PBIN2 L
PBIN2 R
PBIN1 R
0V
1
I
--
Playback equalizer
amplifier input pins.
29
30
1
V
CC
RFS
147
2
6
6
GND
2
4
27
PBFB2 L
PBFB2 R
2.5V
1
--
--
Connection pins for
the capacitor that
determines the
playback equalizer
amplifier's time
constant
(120s, 70s, etc.)
4
27
V
CC
RFS
147
5
5
GND
7k
6
MS OUT
2.5V
1
O
147
Mixed output pin for
the L and R outputs of
the playback equalizer
amplifier.
V
CC
147
GND
4
500
5k
2
500
V
CC
6
3
28
PBFB1 L
PBFB1 R
0.8V
1
--
68k
Playback equalizer
amplifier negative
feedback pins.
5
26
PBOUT L
PBOUT R
2.5V
1
O
147
Playback equalizer
amplifier output pins.
5
26
28
V
CC
RFS
147
6
6
GND
V
CC
26
6
4
V
CC
3
5
7k
147
10k
100k
10k
210k
500
500
3
5
To
10p
10p
3
CXA1498S/M
7
I REF
1.2V
--
--
Recording/playback
equalizer reference
current setting pin.
V
CC
147
GND
2
V
CC
7
GND
5p
11
AGC TC
0V
--
--
Connection pin for
the resistance and
capacitor that
determines the AGC
attack recovery time
constant.
11
V
CC
147
GND
200
2
V
CC
2
500
500
100k
2
200
4
8
SPEED
9
B EQ
10
METAL
22
A EQ
23
DECK AB
--
I
--
Tape speed switching
pin.
High: high speed
Low: normal speed
B deck equalizer
switching pin.
High: 70s EQ
Low: 120s EQ
B deck metal tape
switching pin.
High: metal tape
Low: normal or CrO
2
tape
A deck equalizer
switching pin.
High: 70s EQ
Low: 120s EQ
A deck/B deck
playback switching pin.
High: PBIN2
Low: PBIN1
8
9
10
22
23
V
CC
147
GND
V
CC
Pin
No.
Symbol
DC
voltage
I/O
I/O
resistance
Equivalent circuit
Description
4
CXA1498S/M
12
19
AGC_L
AGC_R
4V
I/O
100k
AGC pins for varying
the input resistance
according to the input
signal level over a
range from 100k
to
several 10
.
12
19
V
CC
GND
4
V
CC
VGS
200
100k
5k
200
10k
13
18
RECIN L
RECIN R
4V
I
50k
Recording equalizer
amplifier input pins.
13
18
V
CC
GND
VGS
1.8k
5p
147
V
CC
24k
50k
15
16
RECOUT L
RECOUT R
4V
O
147
Recording equalizer
amplifier output pins.
16
5p
V
CC
147
GND
10
500
3
500
V
CC
40k
VG
15
20
VG
4V
--
15k
Connection pin for the
capacitor that eliminates
ripple at the signal
reference voltage.
To each
VGS
3p
V
CC
147
GND
V
CC
30k
20
4
500
2
500
30k
14
GND
0V
--
--
Ground pin.
GND
14
17
V
CC
8V
--
--
Power supply voltage
pin.
V
CC
17
Pin
No.
Symbol
DC
voltage
I/O
I/O
resistance
Equivalent circuit
Description
5
CXA1498S/M
21
MUTE
--
I
--
Recording mute control
pin.
Permits soft mute by
connecting an external
CR time constant circuit.
V
CC
147
3
3
GND
20k
20k
V
CC
2V
21
24
RFC
8V
2
--
--
Connection pin for the
resistance and
capacitor used for
generating stable
voltage by eliminating
ripple from the power
supply voltage.
25
RFS
7.2V
2
O
--
Stable voltage output
pin.
V
CC
147
GND
V
CC
250
V
CC
To each RFS
24
25
1
The values of DC voltage require connection of bias resistance between GND and Pins 1, 2, 29 and 30,
respectively.
2
The values of DC voltage require connection of a resistance between Pin 24 and V
CC
, and a capacitor
between Pin 24 and GND for eliminating ripple, respectively.
Pin
No.
Symbol
DC
voltage
I/O
I/O
resistance
Equivalent circuit
Description
6
CXA1498S/M
Electrical Characteristics
(Ta = 25C, V
CC
= 8.0V)
Operating voltage
Current consumption
Reference input level
Reference output level
S/N ratio
(NORM-NORM)
Signal handling
Total harmonic
distortion
Output offset voltage
Recording mute ratio
Recording mute
characteristics
AGC level
Channel balance
AGC distortion
Vopr
I
CC
VIN
VOUT
SN
(A-WTG)
SH
THD
VOFF
FNN-1
FNN-2
FNN-3
FCN-1
FCN-2
FCN-3
FMN-1
FMN-2
FMN-3
FNH-1
FNH-2
FNH-3
FCH-1
FCH-2
FCH-3
FMH-1
FMH-2
FMH-3
MT-1
MT-2
AGC-L
AGC-B
THD-A
Single power supply
NORM/120s-NORM, No signal
NORM-NORM, 315Hz
NORM-NORM, 315Hz
Rg = 5k
, "A"-WTG filter
R
L
= 2.7k
, 1kHz, THD = 1%
R
L
= 2.7k
, 1kHz, 0dB
NORM-NORM
3kHz, 20dB
8kHz, 20dB
12kHz, 20dB
3kHz, 20dB
8kHz, 20dB
12kHz, 20dB
3kHz, 20dB
8kHz, 20dB
12kHz, 20dB
5kHz, 20dB
15kHz, 20dB
20kHz, 20dB
5kHz, 20dB
15kHz, 20dB
20kHz, 20dB
5kHz, 20dB
15kHz, 20dB
20kHz, 20dB
NORM-NORM, 1kHz, +8dB
NORM-NORM, 1kHz, 2.0V
(pin voltage)
R
IN
= 10k
, 1kHz, 25dBm
R
IN
= 10k
, 1kHz, 15dBm
R
IN
= 10k
, 1kHz, 0.0dBm
4.5
7.0
34.5
--
60.0
8.0
--
3.8
1.6
2.4
6.4
3.4
6.1
9.4
3.2
5.1
7.6
1.4
3.9
7.0
3.1
7.6
10.3
3.7
7.7
9.8
--
8.0
31.0
2.0
--
8.0
11.5
33.0
6.0
63.5
10.0
0.19
4.13
0.4
3.9
8.9
4.6
7.6
11.4
4.4
6.6
9.6
0.2
5.7
9.5
4.3
9.4
12.8
4.9
9.2
12.3
85.0
6.0
29.0
0.0
0.8
10.0
15.5
31.5
--
--
--
0.5
4.5
0.8
5.4
11.4
5.8
9.1
13.4
5.6
8.1
11.6
1.0
7.5
12.0
5.5
11.2
15.3
6.1
10.7
14.8
80.0
4.0
27.0
2.0
1.5
V
mA
dBm
dBm
dB
dB
%
V
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dBm
dB
%
Item
Symbol
Unit
Min.
Typ.
Max.
Conditions
Recording equalizer amplifier
AGC
NORM-NORM mode
frequency
characteristics
CrO
2
-NORM mode
frequency
characteristics
METAL-NORM mode
frequency
characteristics
NORM-HIGH mode
frequency
characteristics
CrO
2
-HIGH mode
frequency
characteristics
METAL-HIGH mode
frequency
characteristics
For NORM-
NORM at 315Hz
20dB
For NORM-
NORM at 315Hz
20dB
For NORM-
NORM at 315Hz
20dB
For NORM-
NORM at 315Hz
20dB
For NORM-
NORM at 315Hz
20dB
For NORM-
NORM at 315Hz
20dB
7
CXA1498S/M
70s-NORM frequency
120s-HIGH frequency
70s-HIGH frequency
Signal handling
Total harmonic distortion
S/N ratio
(120s-NORM)
Output offset voltage
DC feedback resistance
Input bias resistance
MIX output voltage
Ripple filter output
current
PB-REF
F120-N
F70-N
F120-H
F70-H
SH
THD
SN (A-WTG)
VOFF
R
FB
R
IN
V-MIX
RFIO
VCH
VCL
315Hz, -70dBm, Frequency
characteristics standard (0dB)
For 2.7kHz, 58.5dBm, at 315Hz
For 4.5kHz, 53.8dBm, at 315Hz
For 5.3kHz, 52.5dBm, at 315Hz
For 9.1kHz, 47.8dBm, at 315Hz
R
L
= 2.7k
, 1kHz, THD = 1%
R
L
= 2.7k
, 1kHz, 52dBm
Rg = 2.2k
, "A"-WTG filter
120s-NORM, Rg = 100k
120s-NORM, 2.7kHz, 52dBm
Threshold voltage of mode
control pin
Threshold voltage of mode
control pin
27.0
1.5
1.2
0.7
1.1
10.0
--
55.0
2.2
150
--
1.5
10.0
2.5
GND
25.0
0.0
0.3
2.2
2.6
3.0
0.19
60.0
2.5
210
0.3
0.0
--
--
--
23.0
1.5
1.8
3.7
4.1
--
0.5
--
2.8
270
1.0
1.5
--
V
CC
1.0
dBm
dB
dB
dB
dB
dBm
%
dB
V
k
A
dB
mA
V
V
Item
Symbol
Unit
Min.
Typ.
Max.
Conditions
Playback equalizer amplifier
120s-NORM mode
frequency
characteristics
NORM-NORM = NORMAL Tape, NORMAL Speed
NORM-HIGH = NORMAL Tape, HIGH Speed
CrO
2
-NORM = CrO
2
Tape, NORMAL Speed
CrO
2
-HIGH = CrO
2
Tape, HIGH Speed
METAL-NORM = METAL Tape, NORMAL Speed
METAL-HIGH = METAL Tape, HIGH Speed
120s-NORM = EQ: 120s, NORMAL Speed
120s-HIGH = EQ: 120s, HIGH Speed
70s-NORM = EQ: 70s, NORMAL Speed
70s-HIGH = EQ: 70s, HIGH Speed
Control voltage "High"
level
Control voltage "Low"
level
8
CXA1498S/M
Electrical Characteristics Test Circuit
S2
S4
R3 2.2k
R5 100k
R7 680k
C2 4.7/25V
R9 100k
S6
R13 2.2k
R11 680k
S8
C6
100
25V
R15
180
C8
0.015
R1
620
GND
GND
Power
Supply
Audio
SG
A
DC
Ammeter
DC 5V
Supply
S10
R18 2.7k
C10
4.7
25V
S18
REC
MUTE
S14
DECK
A/B
R44
10k
C29
4.7
25V
R48
2.7k
S26
R52
100
S34
S35
R43
10k
C28
4.7
25V
R47
2.7k
S33
S25
S32
R51
100
S45
Amp
DIN Audio
R54
50k
GND
"A" WTG
1kHz BPF
Distortion
Analyzer
AC
Voltmeter
Oscillo
-scope
S41
S44
S43
S42
DC
Voltmeter
R22
2.4k
R19
2.4k
R16
5.6k
R33
6.2k
R32
1.1k
R29
3k
S12
R21 470
R24 10k
C12 100/25V
R26 1k
C14 1/25V
R28 1k
C16 1/25V
R31 1k
C18 1/25V
C19 47/25V
R36 10k
C22 10/25V
S20
R38 62k
S22
R40 5.1k
S24
C27 100/25V
C26
2.2
25V
PB IN1
(L)
PB IN2
(L)
PB FB1
(L)
PB FB2
(L)
PB OUT
(L)
MS OUT
I REF
SPEED
DECK-B
EQ
METAL
AGC
TC
AGC
(L)
REC IN
(L)
GND
REC OUT
(L)
PB IN1
(R)
PB IN2
(R)
PB FB1
(R)
PB FB2
(R)
PB OUT
(R)
RFS
RFC
DECK
A/B
DECK-A
EQ
REC
MUTE
VG
AGC
(R)
REC IN
(R)
V
CC
REC OUT
(R)
CXA1498S/M
S15
DECK
B EQ
S17
METAL
S13
TAPE
SPEED
R50
100
S31
R42
10k
R49
100
R41
10k
S30
S29
S28
S27
S40
S39
S37
S36
R46
10k
R53
100
R45
10k
C25
2.2
25V
R35 10k
C23 4.7/25V
R34 300k
C20 10/25V
R30 1k
C17 1/25V
R27 1k
C15 1/25V
R25 1k
C13 1/25V
C7
0.015
R2 2.2k
S1
R4 100k
S3
S5
S7
R6 680k
C1 4.7/25V
R8 100k
R10 680k
R12 2.2k
R14
180
C5
100
25V
C3 4.7/25V
C4 4.7/25V
C9
4.7
25V
R17 2.7k
S9
S11
R20 2.7k
R23 27k
C11
4.7
25V
R37 62k
R39 5.1k
S21
S23
S19
C21 10/25V
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
2
3
4
5
6
7
8
9
10
11
12
13
14
15
1
Noise Filter
S16
DECK
A EQ
0dB or
30dB
9
CXA1498S/M
REC EQ
CONTROL
PB EQ
CONTROL
MUTE
CONT
REC EQ
REC EQ
PB FB1
PB FB2
100k
210k
DECK
A/B
DECK- A
DECK- B
PB IN2
PB IN1
PB
OUT
DECK
A/B
210k
100k
PB FB1
PB FB2
PB IN2
PB IN1
DECK- A
DECK- B
I REF
SPEED
DECK
-B EQ
METAL
AGC
GND
REC
OUT
RFS
RFC
DECK
A/B
DECK
-A EQ
REC
MUTE
VG
AGC
REC
IN
V
CC
REC
OUT
MS
OUT
PB
OUT
AGC
TC
REC
IN
BIAS &
I REF
30k
30k
AGC DET
VGS
V
CC
GND
PB
PB
R12 10k
C17 4.7
GND
GND
R16
5.6k
C23 0.47
C21
2.2
R18 22k
C15 47
R11 1M
GND
GND
C13 4.7
R9 10k
GND
C11 4.7
R7 10k
GND
C9 4.7
R5 10k
GND
GND
GND
R1
180
C3
0.015
C1
100
R3
27k
C5
4.7
C7
4.7
GND
PB Only
HEAD
(DECK-A)
to Dolby NR IC
Dolby NR IC (PB IN)
to AMS
SPEED
DECK-B EQ
METAL
(METAL/METAL)
to Dolby NR IC
Dolby NR IC (RECIN)
LINE IN
from Dolby NR IC
Dolby NR IC
(REC OUT)
C26
2.2
C28
820p
C32
180p
R20
10k
C30
150p
GND
L1
12mH
REC
PB
REC/PB
GND
REC/PB
HEAD
(DECK-B)
R13 10k
C18 4.7
GND
GND
R17
5.6k
C24 0.47
C22
2.2
R19 22k
GND
C14 4.7
R10 10k
GND
C12 4.7
R8 10k
GND
C10 4.7
R6 10k
GND
GND
R2
180
C4
0.015
C2
100
C6
4.7
GND
PB Only
HEAD
(DECK-A)
to Dolby NR IC
Dolby NR IC (PB IN)
Filter OUT
DECK A/B
DECK-A EQ
REC MUTE
to Dolby NR IC
Dolby NR IC (REC IN)
LINE IN
from Dolby NR IC
Dolby NR IC
(RECOUT)
C27
2.2
C29
820p
C33
180p
R21
10k
C31
150p
GND
L2
12mH
REC
PB
REC/PB
GND
REC/PB
HEAD
(DECK-B)
C8 100
R4 10k
GND
C25 100
R15
22k
C20
10
C16
47
V
CC
Bias
OSC
C19
10
R14
22k
V
CC
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
2
3
4
5
6
7
8
9
10
11
12
13
14
15
1
Application circuits shown are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for
any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same.
Application Circuit
10
CXA1498S/M
Notes on Operation
(1) Operation mode control (each mode of recording and playback equalizers)
1: Playback equalizer switching (120s/70s)
(Pins 9, 22 and 23)
2: Normal/double speed switching
(Pin 8)
Both playback and recording equalizers are switched in normal/double speed switching.
For double speed, both playback and
recording systems are switched to
double speed characteristics of each
setting mode:
(PB-EQ: 120s, 70s)
(REC-EQ: NORMAL, CrO
2
, METAL)
3: Recording equalizer switching (NORMAL, CrO
2
, METAL)
(Pins 9 and 10)
(2) Recording mute (REC MUTE: ON/OFF)
(Pin 21)
The recording mute function of the CXA1498S is controlled by a recording mute circuit to vary the electric
volume for recording equalizer amplifier gain by applying the DC voltage to REC MUTE (Pin 21).
DECK A-EQ (Pin 22)
DECK B-EQ (Pin 9)
L
H
120s (A-DECK)
70s (A-DECK)
Follows B-EQ control.
DECK A/B
(Pin 23)
L
H
L
H
Follows A-EQ control.
120s (B-DECK)
70s (B-DECK)
Recording mute ON
Attenuation 6dB
2.0V
REC MUTE
Control voltage
GND
VCL
0.5V
Recording mute OFF
3.5V
VCH
V
CC
METAL (Pin 10)
L
H
NORMAL (Type-
I
)
METAL (Type-
IV
)
CrO
2
(Type-
II
)
METAL (Type-
IV
)
DECK B-EQ
(Pin 9)
L
H
L
H
Normal speed
Double speed
Normal speed
Double speed
Playback EQ
Recording EQ
SPEED Pin 8
11
CXA1498S/M
Recording equalizer vs. Frequency characteristics (Normal speed)
FREQ [kHz]
Response [dB]
0.125
1.0
10
50
5
0
5
10
15
20
25
METAL-NS
CrO
2
-NS
NORM-NS
0dB = NORM-NS mode
315Hz, 25dBm at Rec Out
Recording equalizer vs. Frequency characteristics (Double speed)
FREQ [kHz]
Response [dB]
0.125
1.0
10
50
5
0
5
10
15
20
25
METAL-HS
CrO
2
-HS
NORM-HS
0dB = NORM-NS mode
315Hz, 25dBm at Rec Out
Playback equalizer vs. Frequency characteristics
FREQ [kHz]
Gain [dB]
0.050 0.1
10
20
20
5
dB/
60
1.0
120s-NS
120s-HS
70s-NS
70s-HS
12
CXA1498S/M
AGC output voltage characteristics
Input level [dBm]
Output level [dBm]
35
30
25
20
15
10
5
0
5
35
10
30
25
20
15
AGC OFF
AGC ON
AGC total harmonic distortion
Input level [dBm]
35 30 25 20 15 10
5
0
5
0.01
0.1
1.0
T. H. D + N [%]
13
CXA1498S/M
Package Outline
Unit: mm
CXA1498S
CXA1498M
SONY CODE
EIAJ CODE
JEDEC CODE
PACKAGE STRUCTURE
MOLDING COMPOUND
LEAD TREATMENT
LEAD MATERIAL
PACKAGE WEIGHT
EPOXY / PHENOL RESIN
SOLDER PLATING
COPPER ALLOY
30PIN SDIP (PLASTIC) 400mil
26.9 0.1
+ 0.4
15
16
30
1.778
10.16
8.5 0.1
+ 0.3
0.25 0.05
+ 0.1
0 to 15
0.5 0.1
0.9 0.15
3.0 MIN
0.5 MIN
3.7 0.1
+ 0.4
SDIP-30P-01
SDIP030-P-0400-A
1.8g
1
30PIN SOP (PLASTIC) 375mil
0.45 0.1
1
15
16
30
10.3
0.4
0.5
0.2
1.27
0 to 10
M
0.12
9.3
A
18.8
+ 0.4
0.1
0.10
7.6
+ 0.3 0.1
0.2
+ 0.1
0.05
2.3
+ 0.4
0.05
0.1 0.1
SONY CODE
EIAJ CODE
JEDEC CODE
PACKAGE STRUCTURE
PACKAGE MATERIAL
LEAD TREATMENT
LEAD MATERIAL
PACKAGE WEIGHT
EPOXY RESIN
SOLDER PLATING
COPPER / 42 ALLOY
SOP-30P-L03
SOP030-P-0375-C
0.7g
DETAIL A
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