AD9546SLASHPCBZ datasheet(49/205 Pages) AD

49 / 205 page

Data Sheet

AD9546

Rev. 0 | Page 49 of 205

INPUT/OUTPUT TERMINATION RECOMMENDATIONS

SYSTEM CLOCK INPUTS

XOA

XOB

AD9546

25MHz TO 80MHz

FUNDAMENTAL

AT CUT CRYSTAL

CTUNE

Figure 30. System Clock Input (XOA/XOB) Using the Crystal Path

(CTUNE = 2 × (CLOAD − CSTRAY), Where Typical CSTRAY = 2 pF to 5 pF); see the Crystal

Path Section for Capacitor Definitions)

XOA

649Ω

221Ω

0.1µF

XOB

AD9546

3.3V

CMOS

TCXO

0.1µF

Figure 31. System Clock Input (XOA, XOB) Using the Direct

Path with a TCXO or Oven Controlled Crystal Oscillator (OCXO) Having a

3.3 V CMOS Output

REFERENCE CLOCK INPUTS

REFx

REFxx

INTERNAL DC THRESHOLD

FOR 1.2V OR 1.8V CMOS

AD9546

1.8V RECEIVER

CMOS

DRIVER

High-Z

INPUT

Figure 32. Single-Ended DC-Coupled Mode, 1.2 V or 1.8 V CMOS

(OPTIONAL)

0.1µF

REFx

REFxx

AD9546

1.8V RECEIVER

DRIVER

1.2V

47kΩ

0.6V

Figure 33. Single-Ended AC-Coupled Interface Mode

REFx

REFxx

AD9546

DRIVER

1.2V

47kΩ

0.6V

Figure 34. Single-Ended Internal Pull-Up Resistor Mode

100Ω

REFx

REFxx

LVDS DRIVER

(1.2V COMMON MODE)

LVDS

RECEIVER

AD9546

–

Figure 35. Differential LVDS Input Mode

REFx

DIFFERENTIAL

DRIVER

REFxx

47kΩ

0.6V

0.1µF

1.2V

0.6V

47kΩ

AD9546

Figure 36. Differential AC-Coupled Mode

(RL = 100 Ω Is Recommended, Except For HCSL)

REFx

DIFFERENTIAL DRIVER

(0.6V COMMON MODE)

REFxx

AD9546

Figure 37. Differential DC-Coupled Mode

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