NTE1226 Integrated Circuit
NTE1226
Integrated Circuit
FM Multiplex Stereo Demodulator
Description:
The NTE1226is a silicon monolithic integrated circuit designed for FM multiplex stereo demodulator
applications in FM stereo radio receivers that use phase locked loop techniques. The device contains
a demodulator system, a voltage controlled oscillator, phase detectors, low pass filters, dividers and
a DC amplifier plus a stereo−monoaural switching circuit and a driver circuit for a stereo indicator
lamp. The features available make possible a system delivering high fidelity sound within the cost restrains of inexpensive stereo receivers.
Features:
D No Coil Necessary, all tuning performed with a Single Potentiometer
D Automatic Stereo/Monaural Switching
D High Voltage Gain: GV = 1.5dB (RL = 3.9k)
Absolute Maximum Ratings: (TA = +25C, unless otherwise specified)
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16V
Package Dissipation (TA = +75C), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 350mW
Lamp Driver Current (Pin 6), IL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100mA
Operating Temperature Range, Topg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −20 to +75C
Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −40 to +125C
Electrical Characteristics:(TA = +25C, VCC = 10V, VIN = 160mV, f = 1kHz, RL = 3.9k,
unless otherwise specified)
Parameter
Symbol
Suppy Voltage
VCC
Circuit Current
ICC
Input Impedance
Zi
Stereo Channel Seperation
Voltage Gain
Channel Balance
Total Harmonic Distortion
Lamp Indicator Input Level
Lamp Hysteresis
Sep.
GV
Ch.B
THD
Lamp ON
Test Conditions
Min
Typ Max Unit
7
−
16
V
7
13
18
mA
−
50
−
k
f = 100Hz, Vin (Pilot) = 15mV
30
40
−
dB
f = 1kHz, Vin (Pilot) = 15mV
35
45
−
dB
f = 10kHz, Vin (Pilot) = 15mV
30
40
−
dB
−4.5 −1.5
2.0
dB
−1.5
0
1.5
dB
Monoaural Input, Vin (L+R) = 15mV
−1.5
0
1.5
dB
Monoaural Input, Vin (L+R) = 150mV
−
0.15
0.5
%
Stereo Input, Vin (Pilot) = 15mV
−
0.15
0.5
%
Pilot Level
5
8
11
mV
3
6
9
dB
Quiescent
Monoaural Input, Vin (L+R) = 150mV
Rev. 5−13
Electrical Characteristics (Cont’d):(TA = +25C, VCC = 10V, VIN = 160mV, f = 1kHz, RL = 3.9k,
unless otherwise specified)
Parameter
Symbol
Capture Range
Min
Typ Max Unit
1.5
3
−
%
19kHz Rej. 19kHz, Vin(Pilot) = 15mV
−
35
−
dB
38kHz Rej. 38kHz, Vin(Pilot) = 15mV
−
45
−
dB
−
70
−
dB
0.4
0.6
−
Vrms
CR
Ultrasonic Frequency Rejection
SCA Rejection
Test Conditions
Vin(Pilot) = 15mV
SCA Rej.
Max. Input Level
Vi
Monoaural Input, THD = 1%
Pin Connection Diagram
VCC
1
14 VCO Sample Output
Audio Amp Input
2
Audio Amp Output
3
13 Sample Output
12 Low Pass Filter
Lt Stereo Output
4
11 MPX Input
Rt Stereo Output
5
10 19kHz Pilot
Stereo Indicator Lamp
6
9
GND
7
8
Low Pass Filter
Sample Output
14
8
1
7
Low Pass Filter
Sample
Low Pass Filter
Sample
.785 (19.95)
Max
.300
(7.62)
.200 (5.08)
Max
.100 (2.45)
.600 (15.24)
.099 (2.5) Min
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