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AD9546/PCBZ Scheda tecnica(PDF) 12 Page - Analog Devices |
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AD9546/PCBZ Scheda tecnica(HTML) 12 Page - Analog Devices |
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12 / 205 page  AD9546 Data Sheet Rev. 0 | Page 12 of 205 REFERENCE TO REFERENCE COUPLING The reference to reference coupling measurement always involves two reference inputs: a target reference input and an aggressor reference input. The device configuration comprises a frequency translation from the target reference input to an appropriate OUTxyP/OUTxyN output pair. The target reference frequency is 10 MHz, whereas the aggressor reference frequency deviates from the target reference frequency over a range of ±100 ppm in steps of 0.5 ppm. The values shown in Table 7 are the levels of the worst spur appearing at the OUTxyP/OUTxyN output pair, measured at the appropriate offset frequency relative to the aggressor reference input frequency. To prevent the DPLL from suppressing the coupling spur, the DPLL loop bandwidth is always twice the aggressor reference offset frequency. Table 7. Parameter Min Typ Max Unit TARGET REFERENCE AND INPUT MODE REFA 1.2 V CMOS Aggressor Reference and Input Mode REFAA 1.2 V CMOS −62 dBc REFAA 1.8 V CMOS −59 dBc REFAA Single-Ended AC-Coupled −69 dBc REFA 1.8 V CMOS Aggressor Reference and Input Mode REFAA 1.2 V CMOS −65 dBc REFAA 1.8 V CMOS −66 dBc REFAA Single-Ended AC-Coupled −67 dBc REFA Single-Ended AC-Coupled Aggressor Reference and Input Mode REFAA 1.2 V CMOS −60 dBc REFAA 1.8 V CMOS −58 dBc REFAA Single-Ended AC-Coupled −71 dBc REFA Differential AC-Coupled Aggressor Reference and Input Mode REFB Differential AC-Coupled −76 dBc REFB Differential LVDS −76 dBc REFBB 1.2 V CMOS −75 dBc REFBB 1.8 V CMOS −74 dBc REFBB Single-Ended AC-Coupled −76 dBc REFA Differential LVDS Aggressor Reference and Input Mode REFB Differential AC-Coupled −76 dBc REFB Differential LVDS −76 dBc REFBB 1.2 V CMOS −76 dBc REFBB 1.8 V CMOS −75 dBc REFBB Single-Ended AC-Coupled −68 dBc REFAA 1.2 V CMOS Aggressor Reference and Input Mode REFB Differential AC-Coupled −76 dBc REFB Differential LVDS −75 dBc REFBB 1.2 V CMOS −74 dBc REFBB 1.8 V CMOS −76 dBc REFBB Single-Ended AC-Coupled −76 dBc |
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