844S012 Datasheet, PDF (12/24 Pages) Integrated Device Technology – Crystal-to-LVDS/LVCMOS Frequency Synthesizer

844S012 Data Sheet
Parameter Measurement Information, continued
CRYSTAL-TO-LVDS/LVCMOS FREQUENCY SYNTHESIZER
Offset Voltage Setup
Differential Output Voltage Setup
Applications Information
Recommendations for Unused Input and Output Pins
Inputs:
LVCMOS Control Pins
All control pins have internal pullups or pulldowns; additional
resistance is not required but can be added for additional protection.
A 1k resistor can be used.
Crystal Inputs
For applications not requiring the use of the crystal oscillator input,
both XTAL_IN and XTAL_OUT can be left floating. Though not
required, but for additional protection, a 1k resistor can be tied from
XTAL_IN to ground.
REF_IN Input
For applications not requiring the use of the reference clock, it can be
left floating. Though not required, but for additional protection, a 1k
resistor can be tied from the REF_IN to ground.
Outputs:
LVCMOS Outputs
All unused LVCMOS output can be left floating. We recommend that
there is no trace attached.
LVDS Outputs
All unused LVDS outputs can be left floating. We recommend that
there is no trace attached. Both sides of the differential output pair
should either be left floating or terminated.
844S012 REVISION B 08/25/15
12
©2015 Integrated Device Technology, Inc.