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MAX3580 Datasheet(PDF) 4 Page - Maxim Integrated Products |
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MAX3580 Datasheet(HTML) 4 Page - Maxim Integrated Products |
4 / 21 page Direct-Conversion TV Tuner 4 _______________________________________________________________________________________ AC ELECTRICAL CHARACTERISTICS (continued) (MAX3580 EV kit, VCC = +3.1V to +3.5V, GND = 0V. RF_AGC = BB_AGC = +2.85V, RF input terminated into a 75Ω load, BBI_ and BBQ_ loaded by RL greater than 2kΩ and CL less than 10pF, VCO active, registers are set according to the recommended default register conditions, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VCC = +3.3V, TA = +25°C, unless otherwise noted.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS SIGMA-DELTA FRACTIONAL-N SYNTHESIZER REFERENCE OSCILLATOR Frequency fREF 4 27 MHz Input Impedance ZIN 10 k Ω Voltage Gain 30 V/V Output Impedance ZOUT 15 Ω Buffered Output 10k Ω || 10pF load 0.7 VP-P DIVIDERS RF N Divider Ratio (Notes 12, 13) 12 251 — RF R Divider Ratio VHF band operation requires R divider = 2 1 2 — Fractional-N Resolution 20 Bits LO PHASE DETECTOR AND CHARGE PUMP Phase-Detector Frequency 4 27 MHz Gain = 0 600 Charge-Pump Current ICP Gain = 1 1200 µA Charge-Pump Tri-State Current -10 +10 µA Charge-Pump Compliance Range Charge-pump positive to negative current matching of ≤ ±5% 0.4 VCC - 0.4 V LOCAL OSCILLATOR Tuning Frequency Range fOSC Tank Frequency 2160 4400 MHz VCO Dividers 4 16 — BASEBAND STAGE Nominal Output Voltage (Note 2) 1 VP-P 1dB Output Compression Point P1dB Differential voltage at 3MHz 1.6 2 VP-P Output Impedance Differential 60 Ω Passband AGC Range BB_AGC = 0.5V to 2.85V 30 50 dB Passband Cutoff Attenuation At 3.8MHz (UHF Mode); at 3.325MHz (VHF Mode) 2 5 dB Passband Differential Gain Error 2MHz to 3.8MHz, I channel vs. Q channel (UHF mode) -0.45 +0.45 dB Passband Group Delay From DC to 3.8MHz over any 1.1kHz band (UHF mode) 5 ns Group Delay Mismatch From 0.1MHz to 3.8MHz, I channel vs. Q channel (UHF mode) (Note 9) < 2 ns |
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