Sanyo LA3241 Specifications
Ordering number : ENN2564B
Monolithic Linear IC
LA3241
Preamplifier for
Compact Cassette Recording-Only Use
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.
Package Dimensions
unit: mm
3067A-DIP24S |
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[LA3241] |
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21.0 |
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24 |
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13 |
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7.62 |
6.4 |
0.25 |
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1 |
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12 |
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0.9 |
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(3.25) |
3.9max |
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(0.71) |
1.78 |
0.48 |
0.51min |
3.3 |
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0.95 |
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SANYO: DIP24S (300 mil) |
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Functions
• Recording preamp |
×2 |
• Mike amp |
×1 |
• ALC |
×1 |
• Electronic switch |
×6 |
Specifications
Maximum Ratings at Ta = 25°C
Parameter |
Symbol |
Conditions |
Ratings |
Unit |
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Maximum Supply Voltage |
VCC max |
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16 |
V |
Allowable Power Dissipation |
Pd max |
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720 |
mW |
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Operating Temperature |
Topr |
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–20 to +75 |
°C |
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Storage Temperature |
Tstg |
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–40 to +125 |
°C |
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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.
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
22502TN (OT)/10700TH (KT)/O147TA, TS No. 2564-1/15
LA3241
Recommended Operating Conditions at Ta = 25°C
Parameter |
Symbol |
Conditions |
Ratings |
Unit |
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Recommended Supply Voltage |
VCC |
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6 |
V |
Operating Voltage range |
VCC op |
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4.5 to 14.0 |
V |
Operating Characteristics at Ta = 25°C, VCC = 6 V, RL = 10kΩ , f = 1 kHz, 0dB = 0.775 V
Parameter |
Symbol |
Conditions |
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Ratings |
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Unit |
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min |
typ |
max |
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Quiescent Current |
ICCO |
Me/Nor, Nor/High SW off |
5 |
7.5 |
12 |
mA |
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Quiescent Current |
ICCS |
Me/Nor, Nor/High SW on |
10 |
15 |
20 |
mA |
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[REC Amp] |
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Voltage Gain (Open) |
VGO1 |
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75 |
85 |
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dB |
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Voltage Gain (Closed) |
VG1 |
VO=0dBm |
41.5 |
43.5 |
46.0 |
dB |
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Total Harmonic Distortion |
THD1 |
VO=0.4V |
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0.1 |
0.7 |
% |
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Maximum Output Voltage |
VO max |
THD=1% |
0.7 |
1.0 |
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V |
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Equivalent Input Noise Voltage |
VNI1 |
Rg=2.2kW, BPF : 20Hz to 20kHz |
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1.2 |
1.8 |
µV |
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Input Resistance |
Ri1 |
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40 |
50 |
60 |
kΩ |
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Crosstalk |
CT1 |
Between REC amps |
50 |
70 |
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dB |
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CT2 |
REC amp → Mike amp |
60 |
80 |
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dB |
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Channel Balance |
CB |
Vi=–50dBm |
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0 |
2 |
dB |
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[Mike Amp] |
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Voltage Gain |
VGO2 |
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40 |
50 |
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dB |
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Voltage Gain |
VG2 |
VO=0dBm |
23 |
25 |
27 |
dB |
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Total Harmonic Distortion |
THD2 |
VO=0.4V |
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0.1 |
0.7 |
V |
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Maximum Output Voltage |
VO2 |
THD=1% |
0.8 |
1.1 |
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V |
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Equivalent Input Noise Voltage |
VNI2 |
Rg=2.2kΩ , BPF : 20Hz to 20kHz |
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1.2 |
1.7 |
µV |
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Input Resistance |
Ri2 |
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40 |
50 |
60 |
kΩ |
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Crosstalk |
CT3 |
Mike amp → REC amp |
45 |
60 |
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dB |
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[ALC] |
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ALC Range |
ALCW |
Input range when output distortion becomes |
45 |
55 |
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dB |
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1% aftrer ALC begins to be applied. |
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ALC Balance |
ALCB |
Output difference between CH1 and CH2. |
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0 |
2 |
dB |
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ALC Distortion |
ALCTHD |
Vi=–40dBm |
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0.15 |
0.80 |
% |
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ALC Output Voltage |
ALCVo |
Vi=–40dBm, pin 17 Gnd |
0.37 |
0.46 |
0.57 |
V |
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Vi=–40dBm, pin 17 open |
0.6 |
0.7 |
0.85 |
V |
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Crosstalk |
CT4 |
Between REC amps |
45 |
60 |
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dB |
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CT5 |
REC amp → Mike amp |
50 |
70 |
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dB |
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[Switch] |
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On-State Resistance |
RON |
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30 |
70 |
Ω |
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DC Feedback Resistance |
RF1 |
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40 |
50 |
60 |
kΩ |
No. 2564-2/15
LA3241
Equivalent Circuit Block Diagram
IN2
24
Ω50k
Ω3.6k
Ω3.6k
Ω50k
1
IN1
Equivalent Circuit
24
Ω50k Ω3.6k
VR2 TR17
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Nor / High |
Me / Nor Me / Nor |
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ALC |
ALC |
Nor / High |
MIC |
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NF2 |
OUT2 |
OUT2-1 OUT2-2 |
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OUT2 |
IN2 |
CONT |
SW |
OUT |
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23 |
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22 |
21 |
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20 |
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19 |
18 |
17 |
16 |
15 |
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SBD |
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50kΩ |
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Nor / High |
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Speed |
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-- |
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+ |
preamp2 |
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ALC |
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Ω |
MIC |
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10k |
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preamp1 |
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-- |
+ |
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+ |
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-- |
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SBD |
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Ω |
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50k |
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50kΩ |
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Me / Nor SW |
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2 |
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3 |
4 |
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5 |
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6 |
7 |
8 |
9 |
10 |
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NF1 |
Nor / High Me / Nor Me / Nor |
OUT1 |
ALC |
ALC |
Me / Nor |
MIC |
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OUT1 |
OUT1-1 OUT1-2 |
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IN1 |
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SW |
NF |
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23 |
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22 |
21 |
20 |
19 |
18 17 |
16 |
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15 |
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D4 D5 |
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Ω |
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TR13 |
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100 |
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50kΩ |
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TR18
TR16 |
TR15 |
TR14 
RFC VCC
14 13
R
F
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11 |
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12 |
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MIC |
GND |
Top view |
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IN |
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ILA00602 |
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14 13
High
Speed
Charge
TR12
TR6 
TR3 |
TR4 |
50kΩ |
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TR5
D2 D1
VR1 TR2
3.6kΩ
50kΩ
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10kΩ |
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TR1 |
TR7 |
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50Ω |
50Ω |
100Ω |
10kΩ |
TR9 |
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TR8 |
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10kΩ |
TR9 |
TR10 |
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µA |
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~--100 |
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TR11
50kΩ
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
12 |
ILA00603
No. 2564-3/15
LA3241
Test Circuit Diagram
VNF2VNFS2
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SW4 2/2 |
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1 |
2 |
S14 |
2 |
2 |
Ω |
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300 |
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1 |
S3 |
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2/2 |
Fµ |
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47µF |
300Ω |
300Ω |
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1 |
+ |
+ |
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1 |
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24 |
23 |
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22 |
21 |
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1 |
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2 |
3 |
4 |
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1µF |
+ |
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300Ω |
300Ω |
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47µF |
+ |
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1 |
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S13 |
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2 |
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Ω |
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2 |
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µF |
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300 |
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1/2 |
1 |
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220 |
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+ |
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VIN1 |
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1 |
2 |
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S4 |
1/2 |
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VNF1VNFS1 |
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VO2 |
MIC OUT |
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S9 |
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Ω |
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10k |
1 |
2 |
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1µF |
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+ |
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4.7µF |
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8.2kΩ |
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4.7µF |
Ω |
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Ω |
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100µF |
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300Ω |
+ |
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+ |
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10k |
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+ |
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100k10k |
Ω |
µF |
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+ |
4.7 |
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20 |
19 |
18 |
17 |
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16 |
15 |
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14 |
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LA3241 |
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5 |
6 |
7 |
8 |
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9 |
10 |
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11 |
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+ |
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µF |
100kΩ |
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300Ω |
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470kΩ |
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+ |
4.7 |
+ |
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+ |
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2.2kΩ |
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10kΩ |
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100µF |
16kΩ |
680Ω |
10µF |
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220 |
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1µF |
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+ |
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8.2kΩ |
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µF |
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S5 |
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1 2 S7 |
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+ |
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S8 |
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2 1 |
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S6 |
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2 |
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1 |
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2 1 |
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S1 |
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2 |
1 |
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ICC |
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A |
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+ |
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2 |
µF |
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S11 |
100 |
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13 |
1 |
VCC |
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S10 |
1 |
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2 |
GND |
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12 |
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VO1 |
MIC IN |
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Top view |
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ILA00604
No. 2564-4/15
LA3241
Sample Application Circuit
+ |
radio OUT
PB Amp IN
1µF 8.2kΩ + 
bias
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SW(10) |
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300Ω |
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VCC |
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Level select |
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VCC |
+ |
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4.7µF |
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4.7µF |
Ω |
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µF |
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ON |
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10k |
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radio |
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0.7V |
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+ |
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0.46V |
+ |
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OUT |
+47 |
Z1 |
Z2 |
Z3 |
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OFF |
100kΩ |
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µF |
µF |
100 |
100 |
+ |
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VCC
+
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24 |
3.6kΩ |
Ω |
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50k |
3.6kΩ |
50kΩ |
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1
PB Amp IN
23 |
22 |
21 |
20 |
19 |
18 |
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17 |
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16 |
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15 |
14 |
13 |
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SBD |
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RF |
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50kΩ |
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SBD |
Nor / High |
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Speed |
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-- |
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+ |
preamp2 |
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ALC |
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Ω |
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MIC |
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10k |
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preamp1 |
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+ |
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-- |
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Ω |
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SBD |
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50k |
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50kΩ |
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Me / Not SW |
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SBD |
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2 |
3 |
4 |
5 |
6 |
7 |
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8 |
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9 |
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10 |
11 |
12 |
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100kΩ |
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+ |
Z1 |
Z2 |
Z3 |
+ |
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100µF |
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470kΩ |
4.7µF |
10kΩ |
+ |
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47µF |
4.7µF |
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+ |
680Ω 10µF |
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+ |
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300Ω |
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VCC |
MIC |
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1µF |
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SW(9) |
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Top view |
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bias |
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8.2kΩ |
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VCC |
ILA00605 |
(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 VCC being impressed on Me/Nor SW or Nor/High SW .
5.The ALC level on pin 7 should not be changed over while VCC is impressed.
No. 2564-5/15
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