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S i 5 3 4 1 / 4 0
8
Preliminary Rev. 0.9
Output Voltage Swing
1
Normal Swing Mode
V
OUT
V
DDO
= 3.3 V,
2.5 V, or 1.8 V
LVDS
370
470
570
mVpp_se
LVPECL
650
820
1050
High Swing Mode
V
OUT
V
DDO
= 3.3 V,
2.5 V, or 1.8 V
LVDS
310
420
530
mVpp_se
V
DDO
= 3.3 V
or 2.5 V
LVPECL
590
830
1060
Common Mode Voltage
1, 2, 3
Normal Swing or High Swing Modes
V
CM
V
DDO
= 3.3 V
LVDS
1.12
1.23
1.34
V
LVPECL
1.90
2.0
2.13
V
DDO
= 2.5 V
LVPECL
LVDS
1.17
1.23
1.3
Rise and Fall Times
(20% to 80%)
t
R
/t
F
Normal Swing Mode
—
170
220
ps
High Swing Mode
—
250
320
Differential Output Impedance
4
Z
O
Normal Swing Mode
—
100
—
High Swing Mode
—
Hi-Z
—
Table 5. Differential Clock Output Specifications (Continued)
(V
DD
= 1.8 V ±5%, V
DDA
= 3.3V ±5%, V
DDO
= 1.8 V ±5%, 2.5 V ±5%, or 3.3 V ±5%, T
A
= –40 to 85 °C)
Parameter
Symbol
Test Condition
Min
Typ
Max
Units
Notes:
1.
Normal swing mode, high swing mode, Vswing and Cmode settings are programmable through register settings and
can be stored in NVM. Each output driver can be programmed independently.
2.
Not all combinations of voltage swing and common mode voltages settings are possible.
3.
Common mode voltage min/max variation = ±4% from typical value
4.
Driver output impedance depends on selected output mode (Normal, High).
5.
Measured for 156.25 MHz carrier frequency. Sinewave noise added to VDDO (1.8 V = 50 mVpp, 2.5 V/
3.3 V = 100 mVpp) and noise spur amplitude measured.
OUTx
OUTx
Vpp_se
Vpp_se
Vpp_diff = 2*Vpp_se
Vcm
Vcm
Vcm