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AD608AR Scheda tecnica(PDF) 10 Page - Analog Devices |
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AD608AR Scheda tecnica(HTML) 10 Page - Analog Devices |
10 / 12 page REV. B –10– AD608 Applications Figure 22 shows the AD608 configured for operation in a digital system at a 10.7 MHz IF. The filter’s input and output imped- ance are parallel terminated using 330 Ω resistors and the con- version gain is 24 dB. The RF port is terminated in 50 Ω; in a typical application the input would be matched to a SAW filter using the impedance data shown previously in Table I. Figure 23 shows the AD608 configured for narrowband FM op- eration at a 450 kHz or 455 kHz with an external discriminator. The IF filter has 1500 Ω input and output impedances— the input is matched via a resistive divider and the output is termi- nated in 1500 Ω. The discriminator requires 1 V p-p drive from a 1 k Ω source impedance, here provided by a gain-of-2.5 Class A amplifier. 10.7MHz BPF Z = 330 Ω R2 330 Ω C5 0.1µF R1 330 Ω C2 100pF C3 100pF C4 100pF C1 1µF VPOS LIMO C6 10nF SUPPLY 2.7V TO 5.5V POWER-UP 3V CMOS LIMITER OUTPUT VPOS –1V ±200mV RSSI OUTPUT +0.2V TO +1.8V (20mV/dB) LO INPUT –16dBm RF INPUT –95dBm TO –15dBm BIAS POINT AT VPOS/2 IF BIAS POINT DECOUPLING BPF REVERSE TERMINATION OFFSET-CONTROL LOOP FILTER BPF TERMINATION C7 18nF 16 15 12 11 10 14 13 9 1 2 5 6 7 3 4 8 AD608 VPS1 COM1 RFHI RFLO MXOP LOHI COM2 VMID PRUP LMOP COM3 RSSI IFLO VPS2 FDBK IFHI R3 100 Ω R4 47k Ω R6 51.1 Ω R5 51.1 Ω Figure 22. Application at 10.7 MHz. The Bandpass Filter Can Be a Toko Type SK107 or Murata Type SFE10.7 +5V R1 51.1 Ω C1 0.1µF C2 1nF GND R2 51.1 Ω 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 AD608 VPS1 COM1 RFHI RFLO MXOP LOHI COM2 VMID PRUP LMOP COM3 RSSI IFLO VPS2 FDBK IFHI R3 374 Ω R4 1.5k Ω R6 1k Ω LOHI RFHI C3 1nF R7 1130 Ω F1 C7 0.1µF C6 0.1µF C8 0.1µF C9 0.2µF R5 200 Ω C5 0.1µF R14 8.66k R15 24.9k R13 402 R12 1k CR1 CR2 R8 1k R9 1k C10 0.01µF R11 3.3k AUDIO PRUP RSSI JUMPER F1: TOKO HCFM2–455B F2: MURATA CFY455S CR1, CR2: 1N60 Q1: 2N3906 F2 R10 3.3k Ω R16 47k Ω Q1 C11 0.1µF C4 1nF Figure 23. Narrowband FM Application at 450 kHz or 455 kHz |
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