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Ordering number: EN2619B
Monolithic Linear IC
LA3335M
PLL FM Multiplex Demodulator
for 3 V Headphone Stereos and
Radio-cassette Recorders
Overview
The LA3335M is PLL FM stereo multiplex demodulator IC
designed for use in headphone stereos, etc. which operate from
a low supply voltage.
Applications
.
FM Multiplex IC for 3 V headphones, radio-cassette
recorders
Functions
.
PLL FM stereo decoder, VCO stop, stereo indicator
Features
.
Wide operating voltage range : 1.8 to 6 V
.
Low current dissipation : 1.6 mA
.
Minimum number of external parts required
Package Dimensions
unit : mm
3086A-MFP10S
[LA3335M]
SANYO : MFP10S
Specifications
Maximum Ratings atTa=25°C
Parameter Symbol Conditions Ratings Unit
Maximum supply voltage V
Lamp drive current I
Allowable power dissipation Pd max Ta % 70 °C 50 mW
Operating temperature Topr –20 to +70 °C
Storage temperature Tstg –40 to +125 °C
max 8 V
CC
max 10 mA
L
Operating Conditions atTa=25°C
Parameter Symbol Conditions Ratings Unit
Recommended supply voltage V
Operating voltage range V
Input signal voltage V
CC
op 1.8 to 6 V
CC
IN
3V
150 mV
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
O3096HA(II)/40594HK/O307TA,TS No.2619-1/6
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LA3335M
Operating Characteristics at Ta = 25 °C, VCC= 3 V, input 150 mV, L + R = 90%, pilot = 10%,
f = 1 kHz, See specified Test Circuit.
Parameter Symbol Conditions min typ max Unit
Quiescent current I
Input resistance Ri 35 50 65 kΩ
Output resistance Ro 5.3 7.5 9.7 kΩ
Channel separation CHsep 30 45 dB
Total harmonic distortion THD
Output voltage V
Channel balance CB Monaural 0 1.5 dB
Lamp lighting level V
Lamp hysteresis hy 3.5 dB
Capture range CR Pilot 15 mV ±3%
Allowable input level V
Signal to noise ratio S/N Monaural 82 dB
CCO
O
L
max Monaural, THD = 5% 350 mV
IN
Equivalent Circuit Block Diagram and Test Circuit
No input 1.6 2.5 mA
Monaural 0.6 1.5 %
Stereo main 0.3 1.5 %
Monaural 90 130 180 mV
Pilot 1.5 3.5 6 mV
Decoder
Sync
detection
Lamp
trigger
Stereo
Switch
Phase
comparison
S1: VCO STOP when ON
AMP: Bandwidth of 100 kHz or more, THD = 0.01% or less, input impedance of 330 kΩ or more
* Styrol capacitor
No.2619-2/6
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LA3335M
External Parts
Part Name Symbol Kind Value Remarks
Resistor
Semifixed
resistor
Capacitor
Typical Voltage and Name of Each Pin
Pin No. Voltage Name Remarks
1 1.2 V Input
2
3
4 — VCO
5—NC
6 0 V GND
7 — Stereo indicator Open collector
8
9 1.3 V Decoder output (low)
10 1.3 V Decoder output (high)
V
CC
V
CC
R1 Carbon resistor 27 kΩ VCO time constant
R2 Carbon resistor 560 Ω Limiting resistor
VR1 Carbon resistor 10 kΩ VCO OSC frequency adjust
C1 Electrolytic capacitor 2.2 µF DC blocking
C2 Electrolytic capacitor 0.1 µF Loop filter
C3 Polystyrol capacitor 1000 pF VCO time constant
C4 Electrolytic capacitor 1 µF Pilot detection
C5 Ceramic capacitor 6800 pF De-emphasis
C6 Ceramic capacitor 6800 pF De-emphasis
C7 Electrolytic capacitor Power supply ripple filter
–0.7 V
V
CC
–0.7 V
PLL loop filter
Power supply
Pilot sync detection filter
V
–0.2 V
CC
0.65 V
CC
Proper cares in using IC
1. VCO stop method
Short pin 7 and pin 3 (V
(Note) The maximum voltage to be applied to pin 7 must not exceed the voltage on pin 3.
2. Free-running frequency check method : Use either of the following two methods.
a) Connect pin 4 to a frequency counter through the high input impedance amplifier.
pin) to stop the VCO.
CC
Figure 1
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LA3335M
b) Connect the connection point of the semifixed resistor connected to pin 4 and the fixed resistor to a frequency counter
through the R
3. Separation setting mothod
The LA3335M is so designed that the sub-signal gain is approximately 1.25 times as high as the main signal gain. The
separation can be set by attenuating the sub-signal of the FM detection output. (See Figure 3)
of 240 kΩ. Fig. 2 shows how the error changes as the RXvalue is decreased.
X
∆F–R
X
Error, ∆f–%
RX–Ω
Figure 2
Ro 6 Output impedance
Figure 3
The value of capacitor Co depends on the attenuation of the sub-signal of the FM detection output and the IF IC output
impedance Ro. Fig. 4 shows the value of separation setting capacitor Co when Ro is set to 3 kΩ.
For example, when the attenuation of sub-signal of the IF IC output is 0.9 time that of the main signal, it is seen from
Figure 4 that the value of Co is approximately 500 pF.
Co – Attenuation
Vs = Sub-signal peak value
Vm = main signal peak value
Separation : 35 to 40 dB,
set to double hump response.
Capacitor value, Co – pF
Input sub-signal attenuation,m–dB
Figure 4
No.2619-4/6
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LA3335M
THD–f
Total harmonic distortion, THD – %
Total harmonic distortion, THD – %
Frequency,f–Hz
THD–V
IN
THD–V
CC
Free-running frequency:
=3V
V
CC
Supply voltage, VCC–V
CHsep – f
Total harmonic distortion, THD – %
Free-running frequency:
VCC=3V
Separation, Sep – dB
Input voltage, VIN–mV
Sep–V
CC
Supply voltage, VCC–V
Lamp ON/OFF level – V
Free-running frequency :
=3V
V
CC
ON level
CC
Channel separation, CHsep – dB
–mV
Output level, V
Frequency,f–Hz
V
O–VCC
O
Free funning frequency:
VCC=3V
Supply voltage, VCC–V
Capture range
OFF level
Pilot level – mV
Lamp ON/OFF Level – mV
Supply voltage, VCC–V
Capture range, CzR–%
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LA3335M
– kHz
F
Free-running frequency, f
fF–V
CC
Supply voltage, VCC–V
No input
–mA
CCO
Quiescent current, I
I
CCO–VCC
Supply voltage, VCC–V
No input
No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment,
nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or
indirectly cause injury, death or property loss.
Anyone purchasing any products described or contained herein for an above-mentioned use shall:
1 Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors
and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and
expenses associated with such use:
2 Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO
ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally.
Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume
production. SANYO believes information herein is accurate and reliable, but noguaranteesaremadeorimpliedregardingits use
or any infringements of intellectual property rights or other rights of third parties.
This catalog provides information as of October, 1996. Specifications and information herein are subject to change without notice.
No.2619-6/6
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This datasheet has been download from:
www.datasheetcatalog.com
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