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ADMV1455BBCZ-R7 Scheda tecnica(PDF) 75 Page - Analog Devices |
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ADMV1455BBCZ-R7 Scheda tecnica(HTML) 75 Page - Analog Devices |
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75 / 141 page  Data Sheet ADMV1455 THEORY OF OPERATION analog.com Rev. 0 | 75 of 141 LO TUNABLE FILTERS The LO tunable filters are set using Register 0x800, Register 0x801, Register 0x802, Register 0x803, Register 0x804, and Regis- ter 0x80C. See Table 21 for guidance on setting these filters based upon the LO input frequency. For wideband applications, where the LO input frequency is contin- uously changing, it can be beneficial to set the LO tunable filters for wideband operation. Setting the filters to wideband operation allows the mixer to be driven with healthy input power level, at the expense of spurious mixer products. See Table 22 for guidance on setting these filters based upon the wideband LO input frequencies. Table 21. LO Tunable Filter Narrow-Band Recommended Settings LO Frequency 1×LO 3×LO 4×LO LO Trap LO Band LO Doubler Register 0x800, Bits[4:0] Register 0x801, Bits[4:0] Register 0x802, Bits[3:0] Register 0x803, Bits[7:0] Register 0x804, Bits[1:0] Register 0x80A, Bit 5 Register 0x80C, Bits[7:0] Minimum Maximum 8.85 9.99 0x1F 0x1C 0x08 0x18 0x03 0x00 0x1F 10 11.99 0x1F 0x1C 0x00 0x18 0x03 0x00 0x1D 12 12.49 0x0A 0x07 0x00 0xAA 0x03 0x00 0x04 12.5 12.99 0x0A 0x07 0x00 0xAA 0x03 0x00 0x04 13 13.99 0x0A 0x07 0x00 0xAA 0x03 0x01 0x04 14 14.49 0x0A 0x07 0x05 0xAA 0x03 0x01 0x08 14.5 14.99 0x0A 0x07 0x05 0xA3 0x01 0x01 0x08 15 16.99 0x05 0x05 0x05 0xA3 0x01 0x01 0x08 17 17.99 0x01 0x04 0x05 0xA3 0x01 0x01 0x08 18 18.49 0x01 0x04 0x07 0xA3 0x01 0x01 0x80 18.5 18.99 0x01 0x04 0x07 0xA7 0x01 0x01 0x80 19 20.99 0x01 0x03 0x07 0xA7 0x01 0x01 0x80 21 23.99 0x00 0x02 0x07 0xE7 0x01 0x01 0x80 24 27.5 0x00 0x00 0x07 0xE7 0x01 0x01 0xC0 Table 22. LO Tunable Filter Wideband Recommended Settings LO Frequency 1×LO 3×LO 4×LO LO Trap LO Band LO Doubler Register 0x800, Bits[4:0] Register 0x801, Bits[4:0] Register 0x802, Bits[3:0] Register 0x803, Bits[7:0] Register 0x804, Bits[1:0] Register 0x80A, Bit 5 Register 0x80C, Bits[7:0] Minimum Maximum 8.85 12.99 0x1F 0x00 0x05 0x18 0x03 0x00 0x08 13 27.5 0x1F 0x00 0x05 0xA7 0x01 0x01 0x80 |
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