8.8 PLL1 Specification Characteristics
3.135 V < VDD_PLL2OSC, VDD_PLL1, VDD_PLL2CORE, VDD_CORE < 3.465 V;
1.7 V < VDD_IO, VDD_OSC, VDDO_x < 3.465 V; –40°C < TA < 85°C and TPCB ≤ 105°C. Typical values at VDD_PLL2OSC, VDD_PLL1, VDD_PLL2CORE, VDD_CORE = 3.3 V, VDD_IO, VDD_OSC, VDDOx = 1.8 V, TA = 25°C, at the Recommended Operating Conditions and are not assured.
PARAMETER |
TEST CONDITIONS |
MIN |
TYP |
MAX |
UNIT |
fPD1 |
PLL1 phase detector frequency |
|
|
|
4 |
MHz |
VTUNE |
CTRL_VCXO tune voltage |
|
0 |
|
3.3 |
V |
PN10kHz |
PLL 1/f noise at 10-kHz offset. Normalized to 1 GHz output frequency. (1) |
10-Hz loop bandwidth |
|
–130 |
|
dBc/Hz |
300-Hz loop bandwidth |
|
–131 |
|
BWmin |
Minimum PLL1 bandwidth |
|
|
3 |
|
Hz |
BWmax |
Maximum PLL1 bandwidth |
|
|
300 |
|
Hz |
PFDspur |
PLL1 PFD update spur |
Measured with PLL1 only. PLL1 Bandwidth set to 50 Hz. PLL1 PFD update frequency 1 MHz. |
|
–150 |
–100 |
dBc/Hz |
(1) A specification in modeling PLL in-band phase noise is the 1/f flicker noise, LPLL_flicker(f), which is dominant close to the carrier. Flicker noise has a 10 dB/decade slope. PN10kHz is normalized to a 10-kHz offset and a 1-GHz carrier frequency. PN10kHz = LPLL_flicker(10 kHz) – 20log(Fout / 1 GHz), where LPLL_flicker(f) is the single side band phase noise of only the flicker noise's contribution to total noise, L(f). To measure LPLL_flicker(f) it is important to be on the 10 dB/decade slope close to the carrier. A high compare frequency and a clean crystal are important to isolating this noise source from the total phase noise, L(f). LPLL_flicker(f) can be masked by the reference oscillator performance if a low power or noisy source is used. The total PLL in-band phase noise performance is the sum of LPLL_flicker(f) and LPLL_flat(f).