85401AKLFT IDT, Integrated Device Technology Inc, 85401AKLFT Datasheet - Page 6

• Manufacturer Part Number: 85401AKLFT
• Manufacturer: IDT, Integrated Device Technology Inc
• Type: Clock Multiplexerr

Specifications of 85401AKLFT

• Number Of Clock Inputs: 2
• Mode Of Operation: Differential
• Output Frequency: >2500MHz
• Output Logic Level: LVDS
• Operating Supply Voltage (min): 3.135V
• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (max): 3.465V
• Package Type: VFQFN
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 16
• Lead Free Status / RoHS Status: Compliant

Parameter Measurement Information, continued
Offset Voltage Setup
Application Information
Wiring the Differential Input to Accept Single Ended Levels
Figure 1 shows how the differential input can be wired to accept
single ended levels. The reference voltage V_REF = V
generated by the bias resistors R1, R2 and C1. This bias circuit
should be located as close as possible to the input pin. The ratio of
R1 and R2 might need to be adjusted to position the V_REF in the
center of the input voltage swing. For example, if the input clock
swing is only 2.5V and V
R2/R1 = 0.609.
IDT™ / ICS™ LVDS MULTIPLEXER
ICS85401
2:1 DIFFERENTIAL-TO-LVDS MULTIPLEXER
DC Input
V
DD
LVDS
➤
DD
= 3.3V, V_REF should be 1.25V and
out
out
V
➤
OS
DD
/∆ V
/2 is
OS
6
Differential Output Voltage Setup
Figure 1. Single-Ended Signal Driving Differential Input
DC Input
Single Ended Clock Input
V
DD
LVDS
C1
0.1u
V_REF
ICS85401AK REV. A MARCH 6, 2007
R1
1K
R2
1K
V
DD
CLKx
nCLKx
100
out
out
V
OD
➤
➤
/∆ V
OD