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Stereo Demodulator. LM4500A Datasheet

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Stereo Demodulator. LM4500A Datasheet






LM4500A Demodulator. Datasheet pdf. Equivalent




LM4500A Demodulator. Datasheet pdf. Equivalent





Part

LM4500A

Description

High Fidelity FM Stereo Demodulator



Feature


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Manufacture

National Semiconductor

Datasheet
Download LM4500A Datasheet


National Semiconductor LM4500A

LM4500A; .


National Semiconductor LM4500A

.


National Semiconductor LM4500A

.

Part

LM4500A

Description

High Fidelity FM Stereo Demodulator



Feature


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Manufacture

National Semiconductor

Datasheet
Download LM4500A Datasheet




 LM4500A
July 1987
LM4500A High Fidelity FM Stereo
Demodulator with Blend
General Description
The LM4500A is an improved stereo demodulator IC offer-
ing very low audio distortion A new demodulator technique
minimizes adjacent station interference caused by subcarri-
er harmonics and prevents lock-up problems from pilot car-
rier frequency harmonics The IC features a blend circuit
which optimizes the signal-to-noise ratio under weak signal
conditions by gradually combining left and right channel in-
formation
Features
Y Low distortion 0 1% typ
Y High subcarrier harmonic rejection
Y Large input dynamic range 2 5 Vp-p
Y Voltage controlled blend
Y High separation fixed or adjustable
Y Adjustable gain
Y Reduced stereo-mono DC shift 5 mV typ
Y 55 dB supply ripple rejection
Y Low output impedance
Y Requires no external inductors
Y Wide supply range 8V-16V
Y Excellent rejection of 57 kHz ARI subcarrier
Typical Application
Metal film zero temperature coefficient resistor recommended
FIGURE 1
Order Number LM4500AN
See NS Package Number N16A
C1995 National Semiconductor Corporation TL H 7973
TL H 7973 – 1
RRD-B30M115 Printed in U S A




 LM4500A
Absolute Maximum Ratings
If Military Aerospace specified devices are required
please contact the National Semiconductor Sales
Office Distributors for availability and specifications
Power Supply Voltage
16V
Power Dissipation (Package Limitation)
1800 mW
Derate above TA e a25 C
15 mW C
Operating Temperature Range (Ambient) b40 C to a85 C
Storage Temperature Range
b65 C to a150 C
Lamp Drive Voltage
Max Voltage at Pin 7 with Lamp ‘‘Off’’
30V
Lamp Current
100 mA
Blend Control Input Voltage (Pin 11)
10V
Lead Temperature (Soldering 10 sec )
260 C
Electrical Characteristics Unless otherwise noted VCC e 12 VDC TA e 25 C Vp-p standard multiplex com-
posite signal with L or R channel only modulated at 1 0 kHz and with 10% pilot level using circuit of Figure 1
Parameter
Conditions
Min Typ Max Units
Stereo Channel Separation
Unadjusted
Optimized on Other Channel (Note 1)
30
40
dB
dB
Measured Voltage Gain (Note 1)
08 1
12
THD
2 5 Vp-p Composite Input Signal
1 5 Vp-p Composite Input Signal
0 15 0 3
0 08
%
%
Signal-to-Noise Ratio
DIN45405 Quasi Peak Reading
rms 20 Hz-15 kHz
83 dB
88 dB
Ultrasonic Frequency Rejection
19 kHz
38 kHz
31 dB
45 dB
Stereo Switch Level
19 kHz Input Level for Lamp ‘‘On’’
12 16
20 mVrms
Hysteresis
8 dB
Output Voltage Change
Stereo Blend Control Voltage (Pin 11)
(See Figure 8 )
With Mono Stereo Switching (Note 2)
3 dB Separation
30 dB Separation
3 20 mVDC
07 V
17 V
Minimum Separation
Pin 11 at 0V
1 dB
Monaural Channel Imbalance
Pilot Tone Off
0 03 0 3
dB
Sub-Carrier Harmonic Rejection
76 kHz
114 kHz
152 kHz
80 dB
70 dB
83 dB
Supply Ripple Rejection
f e 1 kHz
57 dB
Input Impedance
50 kX
Output Impedance
100 X
Blend Control Current (Note 1)
b100
b300
mA
Capture Range
g4 %
Operating Supply Voltage
8 16 V
Current Drain
Lamp Disconnected
35 mA
Note 1 See Applications Information and Circuit Description
Note 2 This test is done with the stereo indicator lamp disconnected in order to remove DC shift due to thermal changes These shifts have long time constants
(100 ms) and therefore do not produce audible transients
2




 LM4500A
Typical Performance Characteristics
Supply Current vs
Supply Voltage
Power Supply Rejection vs
Supply Voltage
VCO Free Running
Frequency vs
Supply Voltage
Channel Separation vs
Supply Voltage
Total Harmonic Distortion
vs Composite Input Level
Lamp Pin Saturation
Voltage vs Current
Stereo Separation vs
Temperature
VCO Free Running
Frequency Drift vs
Temperature
Input Impedance vs
Temperature
Gain vs Temperature
Stereo Switch Threshold
vs Temperature
Lamp Pin Saturation
Voltage vs
Temperature
TL H 7973 – 2
3



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