S1T3361D SAMSUNG | Alldatasheet
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Technical content
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.
FEATURES
- Low power consumption (4.0mA typ. at V CC = 4.0V)
- Excellent input sensitivity (-3dB limiting, 2.0 µV rms typ.)
- Minimum number of external components required.
- Operating Voltage: 2.5 to 7.0V
APPLICATIONS
- Cordless phone (for home usage)
- FM dual conversion communications equipment
ORDERING INFORMATION
Device Package Operating Temperature S1T3361D01-D0B0 16 −DIP −300A − 20 °C to +70 °C S1T3361D01-S0B0 16 −SOP −225A 16 −DIP −300A 16 −SOP −225A
S1T3361D LOW VOLTAGE/POWER NARROW BAND FM IF PIN CONFIGURATION ABSOLUTE MAXIMUM RATINGS 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. Characteristic Symbol Value Unit Max. Supply Voltage V CC (MAX) 10 V Supply Voltage Range V CC 2.5 to 7.0 V Detector Input Voltage V I (DET) 1.0 V P-P RF Input Voltage (V CC ≥ 4.0V) V I (RF) 1.0 V rms Mute Function V MUTE − 0.5 to + 0.5 V peak Operating Temperature T OPR − 20 to + 70 °C Storage Temperature T STG − 65 to + 150 °C 8 9 S1T3361D OSC OSC MIXER V CC LIMITER DECOUPLING DECOUPLING QUADRATURE MUTE SCAN SQUELCH FILTER FILTER AUDIO OUTPUT INPUT INPUT CONTROL INPUT OUTPUT INPUT OUTPUT RF INPUT GND
LOW VOLTAGE/POWER NARROW BAND FM IF S1T3361D
ELECTRICAL CHARACTERISTICS
(V CC = 4.0V, fo = 10.7MHz, Δf = ± 3kHz, f MOD = 1kHz, Ta = 25 °C, unless otherwise specified) Characteristic Symbol Test Conditions Min. Typ. Max. Unit Operating Current ICC Squelch off (V 12 = 2V) Squelch on (V 12 = GND) 2.0 3.0 4.0 6.0 8.0 mA mA Input Limiting Voltage V I (LIM) -3.0dB limiting − 2.0 6.0 µV Detector Output Voltage V O (DET) − − 2.0 − V dc Detector Output Impedance Z O (DET) − − 400 − W Recoverd audio output voltage V O V in = 10mV 134 150 168 mV rms Filter Gain G V f = 10kHz, V in = 5mV 40 48 52 dB Filter Output DC Voltage V O (DC) − 1.0 1.5 2.0 V dc Trigger Hysteresis of Filter V TH − − 50 − mV Mute Switch-on Resistance R ON (MUTE) Mute Low − 10 40 Ω Mute Switch-off Resistance R OFF(MUTE) Mute High 1 - 10 M Ω Scan Control Low Output V L (SCAN) Mute off (V 12 = 2V) − − 0.5 V dc Scan Control High Output V H (SCAN) Mute on (V 12 = GND) 3.0 − − V dc Mixer Conversion Gain G V (MIXER) − 30 36 − dB Mixer Input Resistance R I (MIXER) − − 3.3 − k Ω Mixer Input Capacitance C I (MIXER) − − 2.2 − pF
S1T3361D LOW VOLTAGE/POWER NARROW BAND FM IF CHARACTERISTIC GRAPH
LOW VOLTAGE/POWER NARROW BAND FM IF S1T3361D APPLICATION CIRCUIT 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. 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 Mixer input 10.7MHz 10nF 51 Ω Audio Mute Scan Control 10k Ω Squelch SW input 1.0uF Filter Amp out 470k Ω 510k Ω 1.0uF Filter Amp in Audio output 10nF 8.2k Ω 20k Ω Quad coil0.1uF0.1uF 0.1uF 455MHz Filter68pF 220pF Vcc 10.24MHz OSC OSC MIXOUT VCC LIMIN DECOLP LING QUAD S1T3361D AUDIOFINFOUTSQSCANMUTEGNDMIXIN
S1T3361D LOW VOLTAGE/POWER NARROW BAND FM IF NOTES