Sanyo LA3241 Specifications

Ordering number : ENN2564B

22502TN (OT)/10700TH (KT)/O147TA, TS No. 2564-1/15

Overview

The LA3241 is a preamp IC for compact cassette player
recording-only use. The distinctive feature of the LA3241
is that it contains mechanical switches which have been so
far connected externally as peripheral parts.

Applications

• Radio-cassette tape recorder/tape deck-use stereo
compact cassette player.

Features

• Wide ALC : ALCW=60dB typ.

• 2-step ALC level : ALCVo=0.42V, 0.65V.

• On-chip electronic select switches permitting selection
of normal/metal tape and normal/higher speed mode
recording equalizer.

• On-chip mike amp : Gain 25dB typ fixed.

• Low-voltage operaton because the Schottky barrier
diode is used for ALC rectifier diode.

• Wide operating voltage : VCC=4.5 to 14.0V.

Functions

• Recording preamp ×2

• Mike amp ×1

• ALC ×1

• Electronic switch ×6

Package Dimensions

unit: mm

3067A-DIP24S

0.48

(3.25)

3.3

3.9max

0.51min

21.0

(0.71)

1.78

0.25

7.62

6.4

1

12

24

13

0.95

0.9

SANYO: DIP24S (300 mil)

[LA3241]

LA3241

SANYO Electric Co.,Ltd. Semiconductor Company

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN

Preamplifier for

Compact Cassette Recording-Only Use

Monolithic Linear IC

Any and all SANYO products described or contained herein do not have specifications that can handle
applications that require extremely high levels of reliability, such as life-support systems, aircraft’s
control systems, or other applications whose failure can be reasonably expected to result in serious
physical and/or material damage. Consult with your SANYO representative nearest you before using
any SANYO products described or contained herein in such applications.

SANYO assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other
parameters) listed in products specifications of any and all SANYO products described or contained
herein.

Parameter Symbol Conditions Ratings Unit

Maximum Supply Voltage V

CC

max 16 V
Allowable Power Dissipation Pd max 720 mW
Operating Temperature Topr –20 to +75 °C
Storage Temperature Tstg –40 to +125 °C

Specifications

Maximum Ratings at Ta = 25°C

No. 2564-2/15

LA3241

Parameter Symbol Conditions

Ratings

Unit

min typ max

Quiescent Current I

CCO

Me/Nor, Nor/High SW off 5 7.5 12 mA

Quiescent Current I

CCS

Me/Nor, Nor/High SW on 10 15 20 mA
[REC Amp]
Voltage Gain (Open) VG

O1

75 85 dB
Voltage Gain (Closed) VG1 VO=0dBm 41.5 43.5 46.0 dB
Total Harmonic Distortion THD1 VO=0.4V 0.1 0.7 %
Maximum Output Voltage V

O

max THD=1% 0.7 1.0 V

Equivalent Input Noise Voltage V

NI1

Rg=2.2kW, BPF : 20Hz to 20kHz 1.2 1.8 µV

Input Resistance Ri1 40 50 60 kΩ

Crosstalk

CT1 Between REC amps 50 70 dB

CT2 REC amp → Mike amp 60 80 dB
Channel Balance CB Vi=–50dBm 0 2 dB
[Mike Amp]
Voltage Gain VG

O2

40 50 dB
Voltage Gain VG2 VO=0dBm 23 25 27 dB
Total Harmonic Distortion THD2 VO=0.4V 0.1 0.7 V
Maximum Output Voltage VO2 THD=1% 0.8 1.1 V
Equivalent Input Noise Voltage VNI2 Rg=2.2kΩ, BPF : 20Hz to 20kHz 1.2 1.7 µV
Input Resistance Ri2 40 50 60 kΩ
Crosstalk CT3 Mike amp → REC amp 45 60 dB
[ALC]

ALC Range ALC

W

Input range when output distortion becomes

45 55 dB

1% aftrer ALC begins to be applied.

ALC Balance ALC

B

Output difference between CH1 and CH2. 0 2 dB

ALC Distortion ALC

THD

Vi=–40dBm 0.15 0.80 %

ALC Output Voltage ALC

Vo

Vi=–40dBm, pin 17 Gnd 0.37 0.46 0.57 V
Vi=–40dBm, pin 17 open 0.6 0.7 0.85 V

Crosstalk CT4 Between REC amps 45 60 dB

CT5 REC amp → Mike amp 50 70 dB
[Switch]
On-State Resistance R

ON

30 70 Ω

DC Feedback Resistance R

F1

40 50 60 kΩ

Operating Characteristics at Ta = 25°C, VCC= 6 V, RL= 10kΩ, f = 1 kHz, 0dB = 0.775 V

Parameter Symbol Conditions Ratings Unit

Recommended Supply Voltage V

CC

6 V

Operating Voltage range V

CC

op 4.5 to 14.0 V

Recommended Operating Conditions at Ta = 25°C

No. 2564-3/15

LA3241

Equivalent Circuit Block Diagram

24 23 22 21

20

19

18

17

16

15

14

13

1 2 3 4 5 6 7 8 9 10 11 12

3.6kΩ3.6kΩ

50kΩ

50kΩ

50kΩ

50kΩ

10kΩ

50kΩ

IN2 NF2 OUT2 RFC V

CC

Nor / High

OUT2

Me / Nor

OUT2-1

Me / Nor

OUT2-2

ALC

IN2

ALC

CONT

Nor / HighSWMIC

OUT

IN1 NF1 OUT1 MICINGNDNor / High

OUT1

Me / Nor

OUT1-1

Me / Nor

OUT1-2

ALC

IN1

ALC Me / NorSWMIC

NF

+

--

--

--

+

+

preamp1

preamp2

ALC

MIC

SBD

Me / Nor SW

SBD

Nor / High

Speed

ILA00602

R
F

Top view

Equivalent Circuit

1

24 23

2 3 4 5 6 7 8 9 10 11 12

TR18

High

Speed

Charge

TR12

TR11

TR10TR9

TR8

TR1

TR7

TR5

TR2

TR3 TR4

TR6

TR14

TR13

TR15TR16

TR17

VR2

3.6kΩ
50kΩ

VR1

D1D2

D4 D5

TR9

50kΩ

10kΩ

100µA

100Ω

50Ω

50kΩ

50kΩ

50kΩ

3.6kΩ

50Ω

10kΩ

10kΩ

100Ω

22 21

20 19 18 17 16 15 14 13

ILA00603

--

~

No. 2564-4/15

LA3241

Test Circuit Diagram

24123222321420519

6

1781691510141113

12

S14

S13

S4 1/2

SW4

VNF2V

NFS

2 VO2 MIC OUT

2

21

S9

S1

S11

S10

I

CC

V

CC

GND

1 2

2 1

2

1

2

1

+

+

+

+

+

+

+

+ + +

+

+

+ +

+

+

+

1µF

1µF

47µF

47µF

220µF

4.7µF

4.7µF

4.7µF

100µF

100µF

8.2kΩ

100kΩ

1µF

300Ω

300Ω

300Ω

300Ω

8.2kΩ

100kΩ

1µF

470kΩ

220µF

4.7µF

100µF

16kΩ

2.2kΩ

680Ω

10µF

10kΩ

300Ω

300Ω

300Ω

300Ω

10kΩ

10kΩ

10kΩ

2

S3

1

1

VIN1

VNF1V

NFS

1 VO1

2

2

1

1 2

2

S5

S6

MIC IN

S7

S8

1

1 2

2 1 2 1

1

2/2

1/2

2/2

A

7

18

LA3241

ILA00604

Top view

No. 2564-5/15

LA3241

Sample Application Circuit

23

100kΩ

22 21

20

19

18

17 15 14

13

1 2 3 4 5 6 7 8 10 12

+

+ +

+ +

+

+

bias

Z3

Z2

Z1

ILA00605

SW(10)

Level select

V

CC

V

CC

V

CC

100µF

4.7µF

4.7µF

47µF

0.7V
OFF

0.46V
ON

100µF

PB Amp IN

8.2kΩ

300Ω

radio
OUT

radio
OUT

100kΩ

10kΩ

1µF

bias

Z3

Z2

Z1

V

CC

47µF

PB Amp IN

8.2kΩ

470kΩ

10kΩ

680Ω

300Ω

1µF

V

CC

4.7µF

4.7µF

10µF

100µF

MIC

SW(9)

+

+

+

+ +

++

9

16

3.6kΩ

3.6kΩ

50kΩ

50kΩ

50kΩ

50kΩ

10kΩ

50kΩ

+

+

--

--

preamp1

preamp2

ALC

RF

SBD

SBD

Me / Not SW

SBD

SBD

Nor / High

Speed

MIC

24

11

Top view

(Notes)

1. The electronic select switch level is approximately (VCC–0.9)/2.

2. REC amplifier NF parameters Z1 through Z3 should be selected to accommodate the recording level and frequency
response that will be required in metal/normal tape and normal/higher speed modes.

3. Z1 through Z3 may be configured with coil “L”, capacitor “C”, and resistor “R”.

4. The electronic select switch mode illustrated above shown no VCCbeing impressed on Me/Nor SW⑨ or Nor/High
SW⑩.

5. The ALC level on pin 7 should not be changed over while VCCis impressed.