Datasheet for Ic-fm Stereo Transmitter

Datasheet for Ic-fm Stereo Transmitter
NTE7200
Intergrated Circuit
FM Stereo Transmitter
Description:
The NTE7200 is a monolithic intergrated circuit in an 18-Lead DIP type package designed for use
as a stereo transmitter. This device consists of a stereo modulator that creates stereo composite sig‐
nals, an FM modulator that creates FM signals, and an RF amplifier. The stereo modulator develops
composite signals made up of a MAIN (L+R) signal, a SUB (L-R) signal and a pilot (19kHz) signal
using 38kHz crystal oscillators.
The FM modulator has carriers on the FM broadcast band (75 to 108MHz).
The RF amplifier transmits the stereo encoded FM signals and is also a buffer for the FM modulator.
The stereo transmitter is equipped with a constant voltage pin for a variable capacitor that is used to
finly adjust the FM frequency.
Features:
D Low Operating Voltage Range (1.0V to 2.0V)
D Low Power Consumption (3mA Typ)
D Few External Components Required
Applications:
D FM Stereo Transmitters
D Wireless Microphones
Absolute Maximum Ratings: (TA = +25°C unless otherwise specified)
Power Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5V
Power Dissipation, Pd . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1200mW
Derate Above 25°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12mW/°C
Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -25 ° to +75°C
Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -50 ° to +125°C
Recommended Operating Conditions: (TA = +25°C unless otherwise specified)
Parameter
Power Supply Range
Symbol
VCC
Test Conditions
Min
Typ
Max
Unit
1.0
1.25
2.0
V
Electrical Characteristics: (TA = +25°C, VCC = 1.25V unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
0.5
3.0
5.0
mA
Quiescent Current
IQ
Input Impedance
ZIN
fIN = 1kHz
360
540
720
Ω
Input/Output Gain
GV
VIN = 0.5mV
30
37
-
dB
Channel Balance
CB
VIN = 0.5mV
-
-
2
dB
Multiplexer Output Voltage
VOM
THD ≤ 3%
200
-
-
mVpk- pk
Multiplexer 38kHz Leakage
VOO
No Signal
-
1
-
mV
Pilot Output Voltage
VOP
No Load
460
580
-
mVpk- pk
Channel Separation
Sep
With a Standard Demodulation
25
45
-
dB
Input Conversion Noise Voltage
VNIN
IHF- A when 38kHz is Terminated
-
1
-
μVrms
RF Output Voltage
VOSC
350
600
-
mVrms
Pin Connection Diagram
R-Ch Audio Input
1
18 L-Ch Audio Input
Input Amp Bypass
2
17 Multiplexer Modulator Balance
AF GND 3
16 Multiplexer Modulator Balance
38kHz OSC Bypass 4
15 VCC
38kHz OSC 5
14 Multiplexer Signal Output
38kHz OSC 6
13 Pilot Signal Output
RF Output 7
12 Modulation Signal Input
RF GND 8
11 VREF
RF OSC 9
10 RF OSC
18
10
1
9
.256 (6.5)
.902 (22.9)
.156
(3.96)
.129
(3.29)
.100 (2.54)
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