cxa1498m Sony Electronics, cxa1498m Datasheet

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cxa1498m

Manufacturer Part Number
cxa1498m
Description
Recording/playback Equalizer Amplifier For Stereo Tape Recorder
Manufacturer
Sony Electronics
Datasheet
Description
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
• AGC (automatic gain control)
• Playback equalizer amplifier
• Electronic switch for playback head
• Electronic switch for tape equalization
• Electronic switch for metal tapes
• Electronic switch for normal/high speed dubbing
• Recording mute function
• DC controllable for fade IN/OUT
• Playback mixing output pin provided
• Use of this IC simplifies the construction of double
Block Diagram and Pin Configuration (Top View)
The CXA1498S/M is a bipolar IC designed as
(Monolithic filter eliminates the need for external
resonance circuit)
(Variable resistor eliminates the need for external
feedback resistor)
(Changes between A and B decks)
(120µs/70µs) (Independently for A and B decks)
(Effective for both REC EQ and PB EQ)
(Soft mute is possible through use of an external
time constant circuit)
(Controls recording mute function)
(For tune selection)
cassette dubbing system
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.
Recording/Playback Equalizer Amplifier for Stereo Tape Recorder
PB IN1
PB IN1
30
1
PB IN2
PB IN2
DECK
DECK
A/B
A/B
29
2
PB FB1
PB FB1
DECK- B
DECK- B
DECK- A
DECK- A
28
3
100k
100k
PB FB2
PB FB2
210k
PB
210k
PB
2
27
4
2
2
OUT
OUT
PB
PB
26
5
OUT
RFS
MS
25
6
I REF
RFC
BIAS &
I REF
24
7
SPEED
DECK
– 1 –
A/B
23
8
PB EQ
CONTROL
Applications
mixing amplifier and AGC for analog stereo tape
recorders
Structure
Absolute Maximum Ratings (Ta = 25°C)
• Supply voltage
• Operating temperature
• Storage temperature
• Allowable power dissipation
Recommended Operating Condition
DECK
-A EQ
DECK
-B EQ
Recording/playback equalizer amplifier, playback
Bipolar silicon monolithic IC
Supply voltage
30 pin SDIP (Plastic)
REC EQ
CONTROL
CXA1498S/M
22
9
METAL
MUTE
CXA1498S
REC
MUTE
CONT
21
10
VGS
AGC
TC
30k
VG
20
11
30k
AGC
AGC
AGC DET
19
12
REC
REC
P
IN
IN
D
13
18
V
Topr
Tstg
SDIP
SOP
V
30 pin SOP (Plastic)
GND
CC
CC
V
REC EQ
REC EQ
CC
GND
V
14
17
CC
CXA1498M
–65 to +150 °C
–20 to +75
4.5 to 10.0
REC
OUT
REC
OUT
16
15
930
630
12
E91860C49-ST
mW
mW
°C
V
V

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cxa1498m Summary of contents

Page 1

... VGS BIAS & REC EQ I REF CONTROL PB MS DECK AGC OUT OUT I REF SPEED -B EQ METAL – 1 – CXA1498M 30 pin SOP (Plastic Topr –20 to +75 Tstg –65 to +150 °C P SDIP 930 mW D SOP 630 mW V 4 ...

Page 2

Pin Description and Equivalent Circuit Pin DC Symbol I/O No. voltage resistance 1 PBIN1 L 2 PBIN2 PBIN2 R 30 PBIN1 R 3 PBFB1 L 1 0.8V — 68k 28 PBFB1 R 5 PBOUT L ...

Page 3

Pin DC I/O Symbol I/O No. voltage resistance 7 I REF 1.2V — — 8 SPEED METAL — I — DECK AB 11 AGC TC 0V — — Equivalent circuit V V ...

Page 4

Pin DC I/O Symbol I/O No. voltage resistance 12 AGC_L 4V I/O 100k 19 AGC_R 13 RECIN 50k 18 RECIN R 14 GND 0V — — 15 RECOUT 147 16 RECOUT ...

Page 5

Pin DC I/O Symbol I/O No. voltage resistance 21 MUTE — I — RFC 8V — — RFS 7.2V O — 1 The values of DC voltage require connection of bias resistance between GND and Pins ...

Page 6

Electrical Characteristics Item Symbol Vopr Operating voltage I Current consumption CC VIN Reference input level VOUT Reference output level SN S/N ratio (A-WTG) (NORM-NORM) SH Signal handling Total harmonic THD distortion VOFF Output offset voltage FNN-1 NORM-NORM mode FNN-2 frequency ...

Page 7

Item Symbol 120µs-NORM mode PB-REF frequency characteristics F120-N F70-N 70µs-NORM frequency F120-H 120µs-HIGH frequency F70-H 70µs-HIGH frequency SH Signal handling THD Total harmonic distortion S/N ratio SN (A-WTG) (120µs-NORM) VOFF Output offset voltage R DC feedback resistance FB R Input ...

Page 8

CXA1498S/M ...

Page 9

CXA1498S/M ...

Page 10

Notes on Operation (1) Operation mode control (each mode of recording and playback equalizers) 1: Playback equalizer switching (120µs/70µs) (Pins 9, 22 and 23 120µs (A-DECK) DECK A/B (Pin 23) H Follows B-EQ control. 2: Normal/double speed switching ...

Page 11

Recording equalizer vs. Frequency characteristics (Normal speed) 25 0dB = NORM-NS mode 315Hz, –25dBm at Rec Out METAL-NS 5 CrO - NORM-NS –5 0.125 1.0 FREQ [kHz] Recording equalizer vs. Frequency characteristics (Double speed) 25 ...

Page 12

AGC output voltage characteristics –10 –15 –20 –25 –30 –35 –35 –30 –25 –20 –15 Input level [dBm] AGC total harmonic distortion 1.0 0.1 0.01 –35 –30 –25 –20 –15 –10 Input level [dBm] – 12 – AGC OFF AGC ...

Page 13

... Package Outline Unit: mm CXA1498S 30 1 SONY CODE EIAJ CODE JEDEC CODE CXA1498M 30 1 SONY CODE EIAJ CODE JEDEC CODE 30PIN SDIP (PLASTIC) 400mil + 0.4 26.9 – 0 1.778 0.5 ± 0.1 0.9 ± 0.15 PACKAGE STRUCTURE EPOXY / PHENOL RESIN MOLDING COMPOUND SDIP-30P-01 LEAD TREATMENT SOLDER PLATING LEAD MATERIAL ...

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