LTC6902IMS Linear Technology, LTC6902IMS Datasheet - Page 15

• Manufacturer Part Number: LTC6902IMS
• Description: IC OSC MULTIPHASE PREC LP 10MSOP
• Manufacturer: Linear Technology
• Type: Oscillator, Siliconr

Specifications of LTC6902IMS

• Frequency: 20MHz
• Voltage - Supply: 2.7 V ~ 5.5 V
• Current - Supply: 2.5mA
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 10-MSOP, Micro10™, 10-uMAX, 10-uSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Count: -
• Lead Free Status / Rohs Status: Not Compliant

APPLICATIO S I FOR ATIO
POWER SUPPLY SENSITIVITY
Figure 6 shows the output frequency sensitivity to power
supply voltage at several different temperatures. The
LTC6902 has a guaranteed voltage coefficient of 0.1%/V
but, as Figure 6 shows, the typical supply sensitivity is
twice as low.
START-UP TIME
The start-up time and settling time to within 1% of the final
value can be estimated by t
10 s. Note the start-up time depends on R
–0.05
0.15
0.10
0.05
0
2.5
R
PIN 4 = FLOATING ( 10)
SET
Figure 6. Supply Sensitivity
3.0
= 63.2k
U
SUPPLY VOLTAGE (V)
3.5
U
4.0
START
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.
4.5
–40 C
25 C
W
5.0
85 C
R
69012 F06
SET
5.5
(3.7 s/k ) +
SET
U
and is
independent from the setting of the divider pin. For in-
stance with R
of its 200kHz final value (N = 10) in approximately 380 s.
Figure 7 shows start-up times for various R
Jitter
The Peak-to-Peak Jitter vs Output Frequency graph, in the
Typical Performance Characteristics section, shows the
typical clock jitter as a function of oscillator frequency and
power supply voltage. The capacitance from the SET pin,
(Pin 3), to ground must be less than 10pF. If this require-
ment is not met, the jitter will increase.
–10
30
10
70
60
50
40
20
0
0
SET
20k
= 100k, the LTC6902 will settle with 1%
TIME AFTER POWER APPLIED ( s)
63.2k
Figure 7. Start-Up Time
200
400
400k
600
T
V
800
A
+
= 25 C
= 5V
LTC6902
69012 F07
1000
SET
resistors.
15
6902f