8.28 Typical Power Supply Noise Rejection Characteristics(1)
VDD_IN, VDD_PLL, VDD_LDO, VDD_DIG = 3.3 V, VDDO_x = 3.3 V, TA = 25°C, Reference Input = 50 MHz, PFD = 100 MHz, PLL bandwidth = 400 kHz, VCO Ffrequency = 5 GHz, post divider = 8, output divider = 4, AC-LVPECL/AC-LVDS/CML output pair AC-coupled to 100-Ω differential load, HCSL outputs with 50 Ω || 2 pF to GND, sinusoidal noise injected in either of the following supply nodes: VDD_IN, VDD_PLL, VDD_DIG or VDDO_x.
| PARAMETER |
50 mV RIPPLE ON SUPPLY TYPE |
UNIT |
| VDD_IN |
VDD_PLL |
VDD_LDO |
VDD_DIG |
VDDO_x |
| PSNR50k
|
50-kHz spur on 156.25-MHz output |
-86 |
-87 |
-87 |
-110 |
-103 |
dBc |
| PSNR100k
|
100-kHz spur on 156.25-MHz output |
-85 |
-86 |
-86 |
-110 |
-98 |
dBc |
| PSNR500k
|
500-kHz spur on 156.25-MHz output |
-87 |
-89 |
-89 |
-110 |
-97 |
dBc |
| PSNR1M
|
1-MHz spur on 156.25-MHz output |
-91 |
-92 |
-92 |
-110 |
-94 |
dBc |