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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 x 2 (Monolithic filter eliminates the need for external resonance circuit) * AGC (automatic gain control) x 2 * Playback equalizer amplifier x 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)
DECK A EQ PB FB1 (R) PB FB2 (R) REC MUTE REC IN (R) PB IN1 (R) AGC (R) REC OUT (R) PB IN2 (R) PB OUT (R) DECK A/B
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 = 25C) * Supply voltage VCC 12 * Operating temperature Topr -20 to +75 * Storage temperature Tstg -65 to +150 * Allowable power dissipation PD SDIP 930 SOP 630 Recommended Operating Condition Supply voltage VCC 4.5 to 10.0
V C C mW mW
V
RFC
RFS
VG
27 30 28 29 PB IN1 PB IN2 PB FB1 PB FB2 100k 210k DECK A/B DECK- B PB DECK- A
26 PB OUT RFS
25
23 21 22 24 RFC DECK DECK REC A/B -A EQ MUTE
20 VG 30k
19 AGC 30k
18 REC IN
17 VCC VCC
VCC
REC EQ REC EQ GND GND 14
16 REC OUT
PB EQ CONTROL
MUTE CONT VGS
DECK- A DECK A/B DECK- B PB 210k 100k PB FB2 3 4 PB OUT MS OUT DECK -B EQ 8 AGC TC 11 BIAS & I REF REC EQ CONTROL
AGC DET
PB IN1 1
PB IN2 2
PB FB1
5
6
I REF 7
SPEED
9
METAL 10
AGC
12
REC IN
13
REC OUT 15
DECK B EQ
PB FB2 (L)
REC IN (L)
PB IN1 (L)
METAL
PB IN2 (L)
GND
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-
REC OUT (L)
PB FB1 (L)
MS OUT
PB OUT (L)
AGC TC
AGC (L)
I REF
SPEED
E91860C49-ST
CXA1498S/M
Pin Description and Equivalent Circuit Pin No. Symbol DC I/O I/O voltage resistance
VCC
(Ta = 25C, VCC = 8V, no signal) Equivalent circuit
RFS
Description
1 2 29 30
PBIN1 L PBIN2 L PBIN2 R PBIN1 R
x6
x6
0V1
I
--
1 2 29 30
147
x2
Playback equalizer amplifier input pins.
GND
VCC 10p 10p 147 3 28 x6 x6 x4 100k GND To 26 5 500 x6 210k 10k 10k 500 x5 147 5 26 x3 7k
VCC
RFS VCC
3 28
PBFB1 L PBFB1 R
0.8V1
--
68k
Playback equalizer amplifier negative feedback pins.
5 26
PBOUT L PBOUT R
2.5V1
O
147
Playback equalizer amplifier output pins.
VCC
RFS
147
x5 7k
x5
4 27
PBFB2 L PBFB2 R
2.5V1
4
--
--
27
GND
Connection pins for the capacitor that determines the playback equalizer amplifier's time constant (120s, 70s, etc.)
VCC VCC x2
6
MS OUT
2.5V1
147
500
5k
O
147
6 500 x4
Mixed output pin for the L and R outputs of the playback equalizer amplifier.
GND
-2-
CXA1498S/M
Pin No.
Symbol
DC I/O I/O voltage resistance
VCC
Equivalent circuit
VCC
Description
x2
7
I REF
1.2V
--
--
7 147 5p
Recording/playback equalizer reference current setting pin.
GND
GND
8
SPEED
Tape speed switching pin. High: high speed Low: normal speed
VCC VCC
9
B EQ
8 9
B deck equalizer switching pin. High: 70s EQ Low: 120s EQ B deck metal tape switching pin. High: metal tape Low: normal or CrO2 tape A deck equalizer switching pin. High: 70s EQ Low: 120s EQ A deck/B deck playback switching pin. High: PBIN2 Low: PBIN1
147
10
METAL
--
I
--
10 22 23
22
A EQ
GND
23
DECK AB
VCC x2 x2 200 500 x2 x4 500 100k 200
VCC
11
AGC TC
0V
--
--
11 147
Connection pin for the resistance and capacitor that determines the AGC attack recovery time constant.
GND
-3-
CXA1498S/M
Pin No.
Symbol
DC I/O I/O voltage resistance
VCC
Equivalent circuit
Description
VCC
12
12 19
AGC_L AGC_R
19
4V
I/O
100k
VGS x4 GND 200 10k 200 100k 5k
AGC pins for varying the input resistance according to the input signal level over a range from 100k to several 10.
VCC VGS
VCC
13 18
RECIN L RECIN R
50k
1.8k 5p 24k
4V
I
50k
13 18 147
Recording equalizer amplifier input pins.
GND
14
GND
0V
--
--
VCC
14
GND
Ground pin.
VCC
5p 40k x3
15 16
RECOUT L RECOUT R
4V
O
147
147 15 16 500 x 10 GND
500 VG
Recording equalizer amplifier output pins.
17
VCC
8V
--
--
VCC
17
VCC
VCC x2 500 500 x4 To each VGS
Power supply voltage pin.
3p 30k
147
20
VG
4V
--
15k
20 30k
Connection pin for the capacitor that eliminates ripple at the signal reference voltage.
GND
-4-
CXA1498S/M
Pin No.
Symbol
DC I/O I/O voltage resistance
VCC
Equivalent circuit
VCC
Description
147
21
MUTE
--
I
--
21
20k x3
20k x3 2V
Recording mute control pin. Permits soft mute by connecting an external CR time constant circuit.
GND VCC VCC VCC
24
RFC
8V2
--
--
24
147 x 250 25 To each RFS
Connection pin for the resistance and capacitor used for generating stable voltage by eliminating ripple from the power supply voltage. Stable voltage output pin.
25
RFS
7.2V2
O
--
GND
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-
CXA1498S/M
Electrical Characteristics Item Operating voltage Current consumption Reference input level Reference output level S/N ratio (NORM-NORM) Signal handling Total harmonic distortion Output offset voltage NORM-NORM mode frequency characteristics Recording equalizer amplifier CrO2-NORM mode frequency characteristics METAL-NORM mode frequency characteristics NORM-HIGH mode frequency characteristics CrO2-HIGH mode frequency characteristics METAL-HIGH mode frequency characteristics Recording mute ratio Recording mute characteristics AGC level AGC Channel balance AGC distortion Symbol Vopr ICC 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 Conditions Single power supply NORM/120s-NORM, No signal NORM-NORM, 315Hz NORM-NORM, 315Hz Rg = 5k, "A"-WTG filter RL = 2.7k, 1kHz, THD = 1% RL = 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 For NORMNORM at 315Hz -20dB For NORMNORM at 315Hz -20dB For NORMNORM at 315Hz -20dB For NORMNORM at 315Hz -20dB For NORMNORM at 315Hz -20dB For NORMNORM at 315Hz -20dB Min. 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 --
(Ta = 25C, VCC = 8.0V) Typ. 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 Max. 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 Unit 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 %
NORM-NORM, 1kHz, +8dB NORM-NORM, 1kHz, 2.0V (pin voltage) RIN = 10k, 1kHz, -25dBm RIN = 10k, 1kHz, -15dBm RIN = 10k, 1kHz, 0.0dBm
-6-
CXA1498S/M
Item 120s-NORM mode frequency characteristics
Symbol PB-REF F120-N
Conditions 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 RL = 2.7k, 1kHz, THD = 1% RL = 2.7k, 1kHz, -52dBm
Min. -27.0 -1.5 -1.2 0.7 1.1 -10.0 -- 55.0 2.2 150 --
Typ. -25.0 0.0 0.3 2.2 2.6 -3.0 0.19 60.0 2.5 210 0.3 0.0 -- -- --
Max. -23.0 1.5 1.8 3.7 4.1 -- 0.5 -- 2.8 270 1.0 1.5 -- VCC 1.0
Unit dBm dB dB dB dB dBm % dB V k A dB mA V V
70s-NORM frequency F70-N Playback equalizer amplifier 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 Control voltage "High" level Control voltage "Low" level F120-H F70-H SH THD
SN (A-WTG) Rg = 2.2k, "A"-WTG filter VOFF RFB RIN V-MIX RFIO VCH VCL Threshold voltage of mode control pin Threshold voltage of mode control pin 120s-NORM, 2.7kHz, -52dBm 120s-NORM, Rg = 100k
-1.5 10.0 2.5 GND
NORM-NORM = NORMAL Tape, NORMAL Speed CrO2-NORM = CrO2 Tape, NORMAL Speed METAL-NORM = METAL Tape, NORMAL Speed 120s-NORM = EQ: 120s, NORMAL Speed 70s-NORM = EQ: 70s, NORMAL Speed
NORM-HIGH = NORMAL Tape, HIGH Speed CrO2-HIGH = CrO2 Tape, HIGH Speed METAL-HIGH = METAL Tape, HIGH Speed 120s-HIGH = EQ: 120s, HIGH Speed 70s-HIGH = EQ: 70s, HIGH Speed
-7-
Electrical Characteristics Test Circuit
R29 3k R33 6.2k R16 5.6k S39 S37 S36 R19 R22 2.4k 2.4k S14 DECK A/B S16 DECK A EQ R32 1.1k S18 REC MUTE R45 R53 R46 10k 100 10k S40 DC Voltmeter
DC 5V Supply
S2 S26 R48 2.7k
S4
S6 S10 S20 S22 S24 S12 C6 100 25V
S8
R44 10k Amp S35 R54 50k GND 0dB or 30dB 16 R52 S34 100 S45
R7 680k
R18 2.7k
R21 470 R24 10k
R38 62k
C2 4.7/25V
R9 100k R11 680k
C4 4.7/25V
C10 4.7 25V C26 2.2 25V 18 17 27 26 25 24 22 20 21 23 19
30
29
28
C12 100/25V
C14 1/25V
C16 1/25V
C18 1/25V
C19 47/25V
VG
C22 10/25V
RFS
RFC
DECK A/B
PB IN1 (R)
PB IN2 (R)
REC MUTE
AGC (R)
PB FB1 (R)
PB FB2 (R)
REC IN (R)
VCC
C27 100/25V
DC A Ammeter
R3 2.2k
R5 100k
R13 2.2k
R26 1k
R28 1k
R31 1k
R36 10k
R40 5.1k
R15 180 C8 0.015 C29 4.7 25V
PB OUT (R)
Audio SG CXA1498S/M
R1 620
DECK-A EQ
"A" WTG S44 DIN Audio
PB IN1 (L)
PB IN2 (L)
PB FB1 (L)
PB FB2 (L)
PB OUT (L)
DECK-B EQ
AGC (L)
REC IN (L)
MS OUT
I REF
SPEED
METAL
AGC TC
GND
REC OUT REC OUT (R) (L)
C1 4.7/25V
R4 100k
R2 2.2k
R6 680k
R12 2.2k
R20 2.7k
R27 1k
R17 2.7k
R23 27k
R25 1k
R37 62k
C3 4.7/25V
R30 1k
R34 300k
C23 4.7/25V
R39 5.1k
R10 680kR8 100k
S5
S7 S11
R35 10k C21 10/25V
S1
S3
C5 100 25V S9
C13 1/25V
C15 1/25V
C17 1/25V
C20 10/25V
-8-
4 7 11 C11 4.7 25V C7 0.015 R14 180 C9 4.7 25V 5 8 9 10 6 12 13 S21 S19 S13 TAPE SPEED S15 DECK B EQ S17 METAL
S43 1kHz BPF 14 C25 2.2 25V 15 C28 4.7 25V R51 100 R47 2.7k S25 S23 R43 10k S32 AC Voltmeter Distortion Analyzer S31 S30 S29 S28 S27 R41 R49 R42 R50 10k 100 10k 100 Oscillo -scope S33 S42 Noise Filter S41
GND
1
2
3
Power Supply
GND
CXA1498S/M
Application Circuit
GND GND GND PB C27 2.2 C31 150p R21 10k 16 REC OUT C29 C33 820p 180p L2 12mH REC VCC GND REC/PB
Filter OUT
DECK A/B
DECK-A EQ
to Dolby NR IC Dolby NR IC (PB IN)
REC MUTE
to Dolby NR IC Dolby NR IC (REC IN) LINE IN
R15 22k
GND R17 5.6k
GND
GND
GND C16 47 R19 22k C20 10 C22 2.2 17 VCC VCC 18 REC IN
GND
GND
GND
R4 10k
R6 10k
R8 10k
C8 100
C12 4.7
C14 4.7
25 24 RFC 30k PB EQ CONTROL VGS REC EQ AGC DET BIAS & I REF REC EQ CONTROL REC EQ GND MUTE CONT VG 20 RFS
27 30 28 29 PB IN1 PB IN2 PB FB1 PB FB2 100k 26 PB OUT
23 21 22 REC DECK DECK MUTE A/B -A EQ
19 AGC 30k
210k
DECK A/B
DECK- B PB
DECK- A
C18 4.7
R2 180
C4 0.015
C10 4.7
R10 10k
C6 4.7
C24 0.47 C25 100
PB Only HEAD (DECK-A)
R13 10k
C2 100
from Dolby NR IC Dolby NR IC (RECOUT)
VCC
REC/PB HEAD (DECK-B)
C23 0.47
C9 4.7
R5 10k
R7 10k
R9 10k
C11 4.7
R12 10k
C1 100
C13 4.7
R11 1M
PB Only HEAD (DECK-A)
C15 47
R1 180 C7 4.7 R3 27k
C17 4.7
to AMS
SPEED
LINE IN
DECK-B EQ
METAL (METAL/METAL)
to Dolby NR IC Dolby NR IC (PB IN)
CXA1498S/M
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.
to Dolby NR IC Dolby NR IC (RECIN)
from Dolby NR IC Dolby NR IC (REC OUT)
-9-
PB OUT 5 7 11 8 9 6 I REF SPEED DECK -B EQ METAL 10 MS OUT AGC TC AGC 12 REC IN 13 C19 10 R14 22k GND GND GND R16 5.6k R18 22k GND GND GND
DECK- A
Bias OSC
DECK A/B
DECK- B PB
210k
PB IN1
PB IN2
PB FB1
100k PB FB2
GND 14 C21 2.2
1
2
3
4
REC OUT 15
C28 820p R20 10k C26 2.2 GND GND
C32 180p L1 12mH C30 150p GND PB REC/PB GND REC
C3 0.015
C5 4.7
REC/PB HEAD (DECK-B)
GND
GND
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) DECK A-EQ (Pin 22) L DECK A/B (Pin 23) L H 120s (A-DECK) H 70s (A-DECK) L DECK B-EQ (Pin 9) H
Follows A-EQ control. 120s (B-DECK) 70s (B-DECK)
Follows B-EQ control.
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 L H SPEED Pin 8 recording systems are switched to Playback EQ Normal speed Double speed double speed characteristics of each Recording EQ Normal speed Double speed setting mode: (PB-EQ: 120s, 70s) (REC-EQ: NORMAL, CrO2, METAL) 3: Recording equalizer switching (NORMAL, CrO2, METAL) (Pins 9 and 10) METAL (Pin 10) L DECK B-EQ (Pin 9) L H NORMAL (Type-I) CrO2 (Type-II) H METAL (Type-IV) METAL (Type-IV)
(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). REC MUTE Control voltage Recording mute ON GND VCL 0.5V Attenuation -6dB 2.0V Recording mute OFF 3.5V VCH VCC
- 10 -
CXA1498S/M
Recording equalizer vs. Frequency characteristics (Normal speed)
25 0dB = NORM-NS mode 315Hz, -25dBm at Rec Out 20
Response [dB]
15
10 METAL-NS CrO2-NS 0 NORM-NS -5 0.125 1.0 FREQ [kHz] 10 50
5
Recording equalizer vs. Frequency characteristics (Double speed)
25 0dB = NORM-NS mode 315Hz, -25dBm at Rec Out
20
Response [dB]
15
10 METAL-HS CrO2-HS 0 NORM-HS -5 0.125 1.0 FREQ [kHz] 10 50
5
Playback equalizer vs. Frequency characteristics
60
Gain [dB]
5 dB/
120s-NS 120s-HS 70s-NS 70s-HS 1.0 FREQ [kHz] 10 20
20 0.050 0.1
- 11 -
CXA1498S/M
AGC output voltage characteristics
-10 AGC OFF -15
Output level [dBm]
-20 -25 AGC ON -30 -35
-35
-30
-25
-20
-15
-10
-5
0
5
Input level [dBm]
AGC total harmonic distortion
1.0
T. H. D + N [%]
0.1
0.01
-35 -30 -25 -20 -15 -10
-5
0
5
Input level [dBm]
- 12 -
CXA1498S/M
Package Outline CXA1498S
Unit: mm
30PIN SDIP (PLASTIC) 400mil
+ 0.1 05 0.25 - 0.
+ 0.4 26.9 - 0.1
30
16
+ 0.3 8.5 - 0.1
10.16
0 to 15
1 1.778
15
0.5 0.1 0.9 0.15
PACKAGE STRUCTURE
MOLDING COMPOUND SONY CODE EIAJ CODE JEDEC CODE SDIP-30P-01 SDIP030-P-0400-A LEAD TREATMENT LEAD MATERIAL PACKAGE WEIGHT EPOXY / PHENOL RESIN SOLDER PLATING COPPER ALLOY 1.8g
CXA1498M
30PIN SOP (PLASTIC) 375mil
+ 0.4 18.8 - 0.1 30 16 0.10 + 0.4 2.3 - 0.05
3.0 MIN
0.5 MIN
+ 0.4 3.7 - 0.1
10.3 0.4
+ 0.3 7.6 - 0.1
0.1 0.1
9.3
A
1 0.45 0.1
15 1.27
+ 0.1 0.2 - 0.05
0 to 10 0.12 M DETAIL A
PACKAGE STRUCTURE
PACKAGE MATERIAL SONY CODE EIAJ CODE JEDEC CODE SOP-30P-L03 SOP030-P-0375-C LEAD TREATMENT LEAD MATERIAL PACKAGE WEIGHT EPOXY RESIN SOLDER PLATING COPPER / 42 ALLOY 0.7g
- 13 -
0.5 0.2

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