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PDF CXA1498S Data sheet ( Hoja de datos )
| Número de pieza | CXA1498S | |
| Descripción | Recording/Playback Equalizer Amplifier for Stereo Tape Recorder | |
| Fabricantes | Sony Corporation | |
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CXA1498S/M
Recording/Playback Equalizer Amplifier for Stereo Tape Recorder
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
(120µs/70µs) (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)
CXA1498S
30 pin SDIP (Plastic)
CXA1498M
30 pin SOP (Plastic)
Applications
Recording/playback equalizer amplifier, playback
mixing amplifier and AGC for analog stereo tape
recorders
Structure
Bipolar silicon monolithic IC
Absolute Maximum Ratings (Ta = 25°C)
• Supply voltage
VCC 12 V
• Operating temperature Topr –20 to +75 °C
• Storage temperature
Tstg –65 to +150 °C
• Allowable power dissipation
PD SDIP
930 mW
SOP
630 mW
Recommended Operating Condition
Supply voltage
VCC 4.5 to 10.0 V
30 29 28 27 26 25 24 23 22 21
PB IN1 PB IN2 PB FB1 PB FB2
PB RFS RFC DECK DECK REC
100k
OUT
A/B -A EQ MUTE
20 19 18
VG AGC REC
30k IN
210k
DECK
A/B
DECK- B PB
DECK- A
PB EQ
CONTROL
30k
MUTE
CONT
VGS
17 16
VCC REC
OUT
VCC
REC EQ
DECK- A
DECK
A/B
DECK- B PB
210k
BIAS &
I REF
REC EQ
CONTROL
AGC DET
REC EQ
GND
100k
PB IN1 PB IN2 PB FB1 PB FB2
123 4
PB
OUT
5
MS
DECK
AGC
REC
OUT I REF SPEED -B EQ METAL
TC AGC
IN GND
6 7 8 9 10 11 12 13 14
REC
OUT
15
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–
E91860C49-ST
1 page  
CXA1498S/M
Pin
No.
Symbol
DC
voltage
I/O
I/O
resistance
Equivalent circuit
VCC
VCC
21 MUTE
—I —
147 20k 20k
21
×3 ×3
2V
Description
Recording mute control
pin.
Permits soft mute by
connecting an external
CR time constant circuit.
GND
24 RFC
8V∗2 — —
25 RFS
7.2V∗2 O
—
VCC
VCC
VCC
147
24
× 250
To each RFS
GND
25
Connection pin for the
resistance and
capacitor used for
generating stable
voltage by eliminating
ripple from the power
supply voltage.
Stable voltage output
pin.
∗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 VCC, and a capacitor
between Pin 24 and GND for eliminating ripple, respectively.
–5–
5 Page 
Recording equalizer vs. Frequency characteristics (Normal speed)
25
0dB = NORM-NS mode
315Hz, –25dBm at Rec Out
20
15
10
5
0
–5
0.125
METAL-NS
CrO2-NS
NORM-NS
1.0
FREQ [kHz]
10
50
Recording equalizer vs. Frequency characteristics (Double speed)
25
0dB = NORM-NS mode
315Hz, –25dBm at Rec Out
20
15
10
5
0
–5
0.125
METAL-HS
CrO2-HS
NORM-HS
1.0
FREQ [kHz]
10
50
Playback equalizer vs. Frequency characteristics
60
CXA1498S/M
5
dB/
20
0.050 0.1
1.0
FREQ [kHz]
– 11 –
120µs-NS
120µs-HS
70µs-NS
70µs-HS
10 20
11 Page | ||
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| PDF Descargar | [ Datasheet CXA1498S.PDF ] | |
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