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3848 Datasheet(PDF) 2 Page - Allegro MicroSystems |
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3848 Datasheet(HTML) 2 Page - Allegro MicroSystems |
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2 / 3 page  3848 DUAL-CONVERSION AM RECEIVER 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Limits Characteristic Symbol Test Conditions Min Typ Max Units Supply Current ICC I2, Vin = 0 — 50 65 mA I2, Vin = 0, V27 = 0 (Muted) — 1.0 6.0 mA Sensitivity Vin Vout = 50 mV — 6.0 10 µV Usable Sensitivity Vin S + N/N = 20 dB — 14 21 µV Recovered Audio Vout 165 215 265 mV Total Harmonic Dist. THD Mod = 90% — 0.4 2.0 % Oscillator Output Vo V17 80 120 — mV Stop Output Voltage VSTP V8, Vin = 0 4.7 5.0 — V V8, Mod = 0% — 0.10 0.16 V Stop Sensitivity Vstp V12 = 2.5 V, Mod = 0% 30 45 60 µV Stop Bandwidth BWSTP V8 = 2.5 V, = 0% 5.0 6.5 8.0 kHz Wide-Band AGC VAGC Vin = 0 5.0 6.7 8.0 V Vin = 11 mV, Mod = 0% 3.7 5.0 — V Vin = 26 mV, Mod = 0% — — 1.0 V VFSI Vin = 0 — 0.1 0.4 V Vin = 30 µV, Mod = 0% 0.25 0.60 1.05 V Vin = 100 µV, Mod = 0% 1.1 1.6 2.2 V Vin = 1 mV, Mod = 0% 1.8 2.5 3.2 V Vin = 10 mV, Mod = 0% 3.1 3.7 4.4 V VFSI Vin = 0 — — 0.5 V Vin = 30 µV, Mod = 0% 0.9 1.1 1.5 V Vin = 100 µV, Mod 0% 1.3 1.6 2.0 V Vin = 1 mV, Mod = 0% 2.3 2.9 3.5 V Vin = 10 mV, Mod = 0% 2.5 3.7 4.0 V Overload Vin Vout = 3% THD, Mod = 90% 60 100 — mV First Mixer (Note 2) 350 450 — mV -3dB Limiting Vin Mod = 3 kHz peak deviation — 12 — µV IF Output Voltage Vout Vin = 1 mV 200 250 320 mV FM Recovered Audio Vout V7, Mod = 3 kHz peak deviation — 380 — mV Signal to Noise Ratio S+N/N Vin = 1 mV 50 53 — dB Vin = 10 mV 53 56 — dB AGC Figure of Merit FOM Ref. at Vin = 10 mV, Vin for Vout = -10 dB 7.0 10 14 µV ELECTRICAL CHARACTERISTICS at TA = +25°C, VCC = 10 V, fo = 1 MHz, fif1 = 10.7 MHz, fif2 = 450 kHz, Vin = 10 mV; fm = 1 kHz , Mod = 30% (except as noted). Field-Strength Indicator Output Voltage (unmodulated, AGC Reset Low) Field-Strength Indicator Output Voltage (unmodulated, AGC Reset High) Continued next page... W Copyright © 1993, Allegro MicroSystems, Inc. |
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