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LOW VOLTAGE/POWER NARROW BAND FM IF
S1T3361D
INTRODUCTION
The S1T3361D is designed for use in FM dual conversion communication. It contains a complete narrow band FM demodulation system operable to less than 2.5V supply voltage. This low-power narrow-band FM IF system provides the second converter, second IF, demodulator. Filter Amp and squelch circuitry for communications and scanning receivers.
16-DIP-300A
FEATURES
* * * * Low power consumption (4.0mA typ. at VCC = 4.0V) Excellent input sensitivity (-3dB limiting, 2.0Vrms typ.) Minimum number of external components required. Operating Voltage: 2.5 to 7.0V
16-SOP-225A
APPLICATIONS
* * Cordless phone (for home usage) FM dual conversion communications equipment
ORDERING INFORMATION
Device S1T3361D01-D0B0 S1T3361D01-S0B0
Package 16-DIP-300A 16-SOP-225A
Operating Temperature - 20C to +70C
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S1T3361D
LOW VOLTAGE/POWER NARROW BAND FM IF
PIN CONFIGURATION
OSC
1 2 3 4 S1T3361D 5 6 7 8
16 15 14 13 12 11 10 9
RF INPUT GND
OSC MIXER OUTPUT VCC LIMITER INPUT DECOUPLING
MUTE SCAN CONTROL SQUELCH INPUT FILTER OUTPUT FILTER INPUT AUDIO OUTPUT
DECOUPLING QUADRATURE INPUT
ABSOLUTE MAXIMUM RATINGS
Characteristic Max. Supply Voltage Supply Voltage Range Detector Input Voltage RF Input Voltage (VCC 4.0V) Mute Function Operating Temperature Storage Temperature Symbol VCC (MAX) VCC VI (DET) VI (RF) VMUTE TOPR TSTG Value 10 2.5 to 7.0 1.0 1.0 - 0.5 to + 0.5 - 20 to + 70 - 65 to + 150 Unit V V VP-P Vrms Vpeak C C
NOTE: Absolute maximum ratings are those values beyond which permanent damage to the device may occur. These are stress ratings only and functional operation of the device at or beyond them is not implied. Long exposure to these conditions may affect device reliability.
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LOW VOLTAGE/POWER NARROW BAND FM IF
S1T3361D
ELECTRICAL CHARACTERISTICS
(VCC = 4.0V, fo = 10.7MHz, f = 3kHz, fMOD = 1kHz, Ta = 25C, unless otherwise specified) Characteristic Operating Current Symbol ICC VI (LIM) VO (DET) ZO (DET) VO GV VO (DC) VTH RON (MUTE) ROFF(MUTE) VL (SCAN) VH (SCAN) GV (MIXER) RI (MIXER) CI (MIXER) Mute Low Mute High Mute off (V12 = 2V) Mute on (V12 = GND) - - - Vin = 10mV f = 10kHz, Vin = 5mV - - Test Conditions Squelch off (V12 = 2V) Squelch on (V12 = GND) Input Limiting Voltage Detector Output Voltage Detector Output Impedance Recoverd audio output voltage Filter Gain Filter Output DC Voltage Trigger Hysteresis of Filter Mute Switch-on Resistance Mute Switch-off Resistance Scan Control Low Output Scan Control High Output Mixer Conversion Gain Mixer Input Resistance Mixer Input Capacitance -3.0dB limiting - - Min. 2.0 3.0 - - - 134 40 1.0 - - 1 - 3.0 30 - - Typ. 4.0 6.0 2.0 2.0 400 150 48 1.5 50 10 - - 36 3.3 2.2 Max. 8.0 10 6.0 - - 168 52 2.0 - 40 10 0.5 - - - - Unit mA mA V Vdc W mVrms dB Vdc mV M Vdc Vdc dB k pF
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S1T3361D
LOW VOLTAGE/POWER NARROW BAND FM IF
CHARACTERISTIC GRAPH
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LOW VOLTAGE/POWER NARROW BAND FM IF
S1T3361D
APPLICATION CIRCUIT
Mixer input 10.7MHz 51 10nF 16 MIXIN 15 GND
Audio Mute
Scan Control Squelch SW input 10k
Audio Filter Filter Amp out Amp in output 1.0uF 510k 470k 8.2k 9 AUDIO 10nF
1.0uF
14 MUTE
13 SCAN
12 SQ
11 FOUT
10 FIN
S1T3361D OSC 1 OSC MIXOUT VCC 2 3
455MHz Filter
4
LIMIN DECOLP LING 5 6 7
QUAD 8
68pF 10.24MHz Vcc 220pF
20k 0.1uF 0.1uF 0.1uF Quad coil
In the above application circuit, the audio signal is recovered using a conventional quadrature FM detector. The absence of an input signal is indicated by the presence of noise above the desired audio frequencies. This "noise band" is monitored by an active filter and a detector. A squelch trigger circuit indicates the presence of noise (or a tone) by an output which can be used to control scanning. At the same time, an internal switch is operated which can be used to mute the audio.
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S1T3361D
LOW VOLTAGE/POWER NARROW BAND FM IF
NOTES
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