SI5338 Datasheet, PDF (7/170 Pages) Silicon Laboratories – I2C-PROGRAMMABLE ANY-FREQUENCY, ANY-OUTPUT QUAD CLOCK GENERATOR

Si5338
Table 5. Performance Characteristics (Continued)
(V_DD = 1.8 V –5% to +10%, 2.5 V ±10%, or 3.3 V ±10%, T_A = –40 to 85 °C)
Parameter
Phase Increment/Decrement
Update Time
Symbol
Test Condition
Min Typ Max
Unit
P_UPDATE
Pin control^2,3
—
12
— Periods
MultiSynth output <18 MHz
Number of periods of
MultiSynth output frequency
Frequency Increment/
Decrement Step Size
Frequency Increment/
Decrement Range
Frequency Increment/
Decrement Update Time
Frequency Increment/
Decrement Update Time
Spread Spectrum PP
Frequency Deviation
Spread Spectrum Modulation
Rate
f_STEP
R divider not used
1
f_RANGE
R divider not used
—
f_UPDATE
Pin control^2,3
667
MultiSynth output >18 MHz
f_UPDATE
Pin control^2,3
—
MultiSynth output <18 MHz
Number of periods of
MultiSynth output frequency
SS_DEV MultiSynth Output < ~Fvco/8 0.1
SS_DEV MultiSynth Output < ~Fvco/8 30
—
See
ppm
Note ²
—
350²
MHz
—
—
ns
12
— Periods
—
5.0⁴
%
—
63⁵
kHz
Notes:
1. Outputs at integer-related frequencies and using the same driver format. See "3.9.3. Initial Phase Offset" on page 24.
2. The maximum step size is only limited by the register lengths; however, the MultiSynth output frequency must be kept
between 5 MHz and Fvco/8.
3. Update rate via I²C is also limited by the time it takes to perform a write operation.
4. Default value is 0.5% down spread.
5. Default value is ~31.5 kHz.
Table 6. Input and Output Clock Characteristics
(V_DD = 1.8 V –5% to +10%, 2.5 V ±10%, or 3.3 V ±10%, T_A = –40 to 85 °C)
Parameter
Symbol
Test Condition
Min
Typ
Max
Input Clock (AC Coupled Differential Input Clocks on Pins IN1/2, IN5/6)
Frequency
f_IN
5
—
710
Differential Voltage
Swing
V_PP
710 MHz input
0.4
—
2.4
Rise/Fall Time
Duty Cycle¹
t_R/t_F
20%–80%
DC
< 1 ns tr/tf
—
—
1.0
40
—
60
Notes:
1. For best jitter performance, keep the input slew rate on pins 1,2,5,6 faster than 0.3 V/ns
2. Not in PLL bypass mode.
3. For best jitter performance, keep the input single ended slew rate on pins 3 or 4 faster than 1 V/ns
4. Only two unique frequencies above 350 MHz can be simultaneously output, Fvco/4 and Fvco/6.
5. Includes effect of internal series 22  resistor.
Units
MHz
V_PP
ns
%
Rev. 0.6
7