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MAX2108 Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX2108 Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 12 page Direct-Conversion Tuner IC _______________________________________________________________________________________ 7 Power-Supply Sequencing The MAX2108 has several +5V supply pins. Configure the supply layout in a star format, with a bypass capac- itor that dominates the rise time of the supply at the center of the star to ensure that all pins see approxi- mately the same voltage during power-up. Filters in Direct-Conversion Tuners Typically, a 5th- or 7th-order L-C lowpass filter is used for anti-aliasing the ADCs following the MAX2108. Table 1 offers suggested component values for these lowpass filters. Figures 1 and 2 describe typical filtering requirements. Table 1. Suggested Component Values for Discrete Lowpass Filters 0.1dB Chebyshev, fC = 30MHz 60 0.1dB Chebyshev, fC = 20MHz 40 FILTER TYPE ADC SAMPLING RATE (Msps) 50 50 RS ( Ω) 11 20 C1 (pF) 620 910 L1 (nH) 41 60 C2 (pF) 910 1500 L2 (nH) 50 75 C3 (pF) 1000 1500 L3 (nH) 41 60 C4 (pF) 20 20 RL (k Ω) 50 15 680 39 820 33 Short Open 20 0.1dB Chebyshev, fC = 20MHz 90 50 9 390 28 620 34 680 28 20 0.1dB Chebyshev, fC = 45MHz |
Similar Part No. - MAX2108 |
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Similar Description - MAX2108 |
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