LTC6905IS5 Linear Technology, LTC6905IS5 Datasheet - Page 9

• Manufacturer Part Number: LTC6905IS5
• Manufacturer: Linear Technology
• Type: Silicon Oscillatorr

Specifications of LTC6905IS5

• Mounting Style: Surface Mount
• Screening Level: Industrial
• Product Length (mm): 2.9mm
• Product Depth (mm): 1.75mm
• Product Height (mm): 0.9mm
• Package / Case: TSOT-23
• Lead Free Status / RoHS Status: Not Compliant

APPLICATIONS INFORMATION
JITTER AND DIVIDE RATIO
At a given output frequency, a higher master oscillator
frequency and a higher divide ratio will result in lower
jitter and higher power supply dissipation. Indeterminate
jitter percentage will decrease by a factor of slightly less
than the square root of the divider ratio, while determinate
jitter will not be similarly attenuated. Please consult the
specifi cation tables and Jitter vs Frequency graph showing
jitter at various divider ratios.
JITTER AND STRAY CAPACITANCE ON THE SET PIN
(PIN 3)
The stray capacitance on the SET pin (Pin 3) should be
limited to 10pF or less to avoid increased jitter or unstable
oscillation.
LTC6905 SUGGESTED CRITICAL COMPONENT LAYOUT
In order to provide the specifi ed performance, it is re-
quired that the frequency setting resistor R
supply bypass capacitor be placed as close as possible
to the LTC6905. The following additional rules should be
followed for best performance:
SET
and the
1) The bypass capacitor must be placed as close as possible
2) The resistor R
3) If a ground plane is used, the connection of the LTC6905
to the LTC6905, and no vias should be placed between
the capacitor and the LTC6905. The bypass capacitor
must be on the same side of the circuit board as the
LTC6905.
to the LTC6905, and the connection of R
should be closely shared with the bypass capacitor.
The resistor R
of the board from the LTC6905, directly underneath the
bypass capacitor.
to the ground plane should be as close as possible
to the LTC6905 GND pin and should be composed of
multiple, high current capacity vias.
Figure 2. LTC6905 Suggested Critical Component Layout
R
SET
SET
should be placed as close as possible
may be placed on the opposite side
C
LTC6905
6905 F02
LTC6905
SET
to V
6905fd
9
CC