CS2100-OTP Datasheet, PDF (7/28 Pages) Cirrus Logic – Fractional-N Clock Multiplier

CS2100-OTP
AC ELECTRICAL CHARACTERISTICS
Test Conditions (unless otherwise specified): VD = 3.1 V to 3.5 V; T_A = -10°C to +70°C (Commercial Grade);
C_L = 15 pF.
Parameters
Symbol
Conditions
Min Typ Max Units
Crystal Frequency
f_XTAL
Fundamental Mode
8
-
50 MHz
Reference Clock Input Frequency
f_{REF_CLK}
8
-
75 MHz
Reference Clock Input Duty Cycle
D_{REF_CLK}
45
-
55
%
Internal System Clock Frequency
f_{SYS_CLK}
8
18.75 MHz
Clock Input Frequency (Auto R-Mod Disabled)
f_{CLK_IN}
50 Hz -
30 MHz
Clock Input Frequency (Auto R-mod Enabled)
f_{CLK_IN}
Auto R Modifier = 1
4
Auto R Modifier = 0.5
72
-
59
kHz
-
138 kHz
Auto R Modifier = 0.25 168
-
256 kHz
Clock Input Pulse Width (Note 3)
Clock Skipping Timeout
Clock Skipping Input Frequency
PLL Clock Output Frequency
PLL Clock Output Duty Cycle
Clock Output Rise Time
Clock Output Fall Time
Period Jitter
Base Band Jitter (100 Hz to 40 kHz)
pw_{CLK_IN} f_{CLK_IN} < f_{SYS_CLK}/96
2
-
f_{CLK_IN} > f_{SYS_CLK}/96
10
-
t_CS
(Notes 4, 5)
20
-
f_{CLK_SKIP}
(Note 5)
50 Hz -
f_{CLK_OUT}
6
-
t_OD
Measured at VD/2
48
50
t_OR
20% to 80% of VD
-
1.7
t_OF
80% to 20% of VD
-
1.7
t_JIT
(Note 6)
-
70
(Notes 6, 7)
-
50
-
UI
-
ns
-
ms
80
kHz
75 MHz
52
%
3.0
ns
3.0
ns
150 ps rms
- ps rms
Wide Band JItter (100 Hz Corner)
(Notes 6, 8)
-
175
- ps rms
PLL Lock Time - CLK_IN (Note 9)
t_LC
PLL Lock Time - REF_CLK
t_LR
Output Frequency Synthesis Resolution (Note 10) f_err
f_{CLK_IN} < 200 kHz
-
f_{CLK_IN} > 200 kHz
-
f_{REF_CLK} = 8 to 75 MHz
-
High Resolution
0
High Multiplication
0
100 200
UI
1
3
ms
1
2
ms
-
±0.5 ppm
-
±112 ppm
Notes: 3.
4.
5.
1 UI (unit interval) corresponds to t_{SYS_CLK} or 1/f_{SYS_CLK}.
t_CS represents the time from the removal of CLK_IN by which CLK_IN must be re-applied to ensure that
PLL_OUT continues while the PLL re-acquires lock. This timeout is based on the internal VCO frequen-
cy, with the minimum timeout occurring at the maximum VCO frequency. Lower VCO frequencies will
result in larger values of t_CS.
Only valid in clock skipping mode; See “CLK_IN Skipping Mode” on page 11 for more information.
6. f_{CLK_OUT} = 24.576 MHz; Sample size = 10,000 points; AuxOutSrc[1:0] = 11.
7. In accordance with AES-12id-2006 section 3.4.2. Measurements are Time Interval Error taken with 3rd
order 100 Hz to 40 kHz bandpass filter.
8. In accordance with AES-12id-2006 section 3.4.1. Measurements are Time Interval Error taken with 3rd
order 100 Hz Highpass filter.
9. 1 UI (unit interval) corresponds to t_{CLK_IN} or 1/f_{CLK_IN}.
10. The frequency accuracy of the PLL clock output is directly proportional to the frequency accuracy of the
reference clock.
DS841PP1
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