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LTC6906
10
6906fc
APPLICATIONS INFORMATION
Start-Up Time
When the LTC6906 is powered up, it holds the OUT pin
low. After the master oscillator has settled, the OUT pin
is enabled and the first output cycle is guaranteed to be
within specification. The time from power-up to the first
output transition is given approximately by:
tSTART 64 tOSC + 100μs
The digital divider ratio, N, does not affect the start-up time.
Power Supply Rejection
The LTC6906 has a very low supply voltage coefficient,
meaning that the output frequency is nearly insensitive
to the DC power supply voltage. In most cases, this error
term can be neglected.
High frequency noise on the power supply (V+) pin has the
potential to interfere with the LTC6906’s master oscilla-
tor. Periodic noise, such as that generated by a switching
power supply, can shift the output frequency or increase
jitter. The risk increases when the fundamental frequency
or harmonics of the noise fall near the master oscillator
frequency. It is relatively easy to filter the LTC6906 power
supply because of the very low supply current. For ex-
ample, an RC filter with R = 160Ω and C = 10μF provides
a 100Hz lowpass filter while dropping the supply voltage
only about 10mV.
Operating the LTC6906 with Supplies Higher Than 3.6V
The LTC6906 may also be used with supply voltages
between 3.6V and 5.5V under very specific conditions.
To ensure proper functioning above 3.6V, a filter circuit
must be attached to the power supply and located within
1cm of the device. A simple RC filter consisting of a 100Ω
resistor and 1μF capacitor (Figure 16) will ensure that sup-
ply resonance at higher supply voltages does not induce
unpredictable oscillator behavior. Accuracy under higher
supplies may be estimated from the typical Frequency vs
Supply Voltage curves in the Typical Performance Char-
acteristics section of this data sheet.
Figure 12. Test Circuit with an Inductive Power Supply
Figure 13. Output Waveforms with
an Inductive Supply (See Figure 12)
Figure 14. Test Circuit with a Resistive Power Supply
Figure 15. Output Waveforms with
a Resistive Supply (See Figure 14)
V+
GND
DIV
OUT
GRD
SET
LTC6906
RSET
100k
LS
330nH
3.3V
6906 F12
CLOAD
1MHz
V+
GND
DIV
OUT
GRD
SET
LTC6906
RSET
100k
RS
100Ω
3.3V
6906 F14
CLOAD
1MHz
TIME (s)
4.65
V
OUT
(V)
2
3
5.05
6906 F13
1
0
4.75
4.85
5.15
3.5
4.95
CLOAD = 5pF
CLOAD = 10pF
CLOAD = 20pF
CLOAD = 50pF
TIME (s)
0.4
V
OUT
(V)
2
3
1.0
6906 F15
1
0
0.7
0.6
0.5
0.8
1.1
3.5
0.9
CLOAD = 5pF
CLOAD = 10pF
CLOAD = 20pF
CLOAD = 50pF
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