MC68HC08AS20 Datasheet, PDF (375/386 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

21.11 CGM Acquisition/Lock Time Information
Description
Filter Capacitor Multiply Factor
Acquisition Mode Time Factor
Tracking Mode Time Factor
Symbol Min
C_fact
—
K_acq
—
K_trk
—
Typ
0.0154
0.1135
0.0174
Max
Unit
—
F/sV
—
V
—
V
Manual Mode Time to Stable⁽¹⁾
t_acq
— ----8-----^×-----V----^D---^D---^A------
f_xclk × K_acq
—
s
Manual Stable to Lock Time⁽¹⁾
Manual Acquisition Time
Tracking Mode Entry Frequency Tolerance
Acquisition Mode Entry Frequency Tolerance
LOCK Entry Frequency Tolerance
LOCK Exit Frequency Tolerance
Reference Cycles per Acquisition Mode Measurement
Reference Cycles per Tracking Mode Measurement
t_al
t_Lock
∆_trk
∆_acq
∆_Lock
∆_unl
n_acq
n_trk
— ---⁴-----^×----V-----^D---^D---^A----
f_xclk × K_trk
—
t_acq + t_al
0
—
±6.3
—
%
0
—
±0.9
—
%
—
32
—
128
—
—
± 3.6%
± 7.2%
± 0.9%
± 1.8%
—
—
s
s
—
—
—
—
Cyc.
Cyc.
Automatic Mode Time to Stable⁽¹⁾
t_acq
-n---^a---^c---^q-
f_xclk
----8-----^×-----V----^D---^D---^A------
f_xclk × K_acq
—
s
Automatic Stable to Lock Time⁽¹⁾
t_al
-n----^t-^r--^k-- ---⁴-----^×----V-----^D---^D---^A----
f_xclk f_xclk × K_trk
—
s
Automatic Lock Time
t_Lock
—
t_acq+t_al
—
s
PLL Jitter⁽²⁾
f_J
0
—
± f_crys ×
0.025%
Hz
× N/4
1. If C_F chosen correctly
2. Deviation of average bus frequency over 2 ms. This parameter is guaranteed but not tested. N = VCO frequency multiplier.
MC68HC08AS20 — Rev. 4.1
Freescale Semiconductor
Advance Information
375