LTC6902 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC6902' PDF : 16 Pages View PDF
LTC6902
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 tSTART ≅ RSET(3.7µs/kΩ) +
10µs. Note the start-up time depends on RSET and is
independent from the setting of the divider pin. For in-
stance with RSET = 100k, the LTC6902 will settle with 1%
of its 200kHz final value (N = 10) in approximately 380µs.
Figure 7 shows start-up times for various RSET resistors.
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.
0.15
RSET = 63.2k
PIN 4 = FLOATING (÷10)
0.10
0.05
25°C
–40°C
85°C
0
–0.05
2.5
3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
69012 F06
Figure 6. Supply Sensitivity
70
60
VTA+
=
=
25°C
5V
50
40
30
20
400k
10
63.2k
0
20k
–10
0
200 400 600 800 1000
TIME AFTER POWER APPLIED (µs)
69012 F07
Figure 7. Start-Up Time
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.
6902f
15
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