LTC6905 Linear Technology, LTC6905 Datasheet - Page 7

• Manufacturer Part Number: LTC6905
• Description: 17MHz to 170MHz Resistor Set SOT-23 Oscillator
• Manufacturer: Linear Technology

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PACKAGE DESCRIPTIO
APPLICATIO S I FOR ATIO
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 specified 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:
1) The bypass capacitor must be placed as close as
possible 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.
0.20 BSC
NOTE:
1. DIMENSIONS ARE IN MILLIMETERS
2. DRAWING NOT TO SCALE
3. DIMENSIONS ARE INCLUSIVE OF PLATING
4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
5. MOLD FLASH SHALL NOT EXCEED 0.254mm
6. JEDEC PACKAGE REFERENCE IS MO-193
U
3.85 MAX
DATUM ‘A’
U
2.62 REF
RECOMMENDED SOLDER PAD LAYOUT
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
MAX
0.62
0.30 – 0.50 REF
PER IPC CALCULATOR
W
U
0.95
REF
SET
(Reference LTC DWG # 05-08-1635)
U
1.22 REF
1.4 MIN
0.09 – 0.20
(NOTE 3)
and the
5-Lead Plastic TSOT-23
S5 Package
2.80 BSC
1.00 MAX
1.50 – 1.75
2) The resistor R
3) If a ground plane is used, the connection of the LTC6905
(NOTE 4)
0.80 – 0.90
PIN ONE
to the LTC6905, and the connection of R
should be closely shared with the bypass capacitor. The
resistor R
board from the LTC6905, directly underneath the by-
pass 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
0.95 BSC
SET
R
may be placed on the opposite side of the
SET
2.90 BSC
(NOTE 4)
1.90 BSC
should be placed as close as possible
C
S5 TSOT-23 0302
0.30 – 0.45 TYP
5 PLCS (NOTE 3)
0.01 – 0.10
LTC6905
6905 F02
LTC6905
SET
to V
6905fa
7
CC