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LTC1799
10
1799fc
applicaTions inForMaTion
Once RIN/RSET is known, calculate RSET from:
RSET =
10MHz
N
10k
fOSC(MAX)
VIN(MAX) V+
(
)+V
RES 1+
RIN
RSET
VRES
RIN
RSET
(3)
Maximum VCO Modulation Bandwidth
The maximum VCO modulation bandwidth is 10kHz; that
is, the LTC1799 will respond to changes in VIN at a rate
up to 25kHz. In lower frequency applications however, the
modulation frequency may need to be limited to a lower
rate to prevent an increase in output jitter. This lower limit
is the master oscillator frequency divided by 20, (fOSC/20).
In general, for minimum output jitter the modulation fre-
quency should be limited to fOSC/20 or 10kHz, whichever
is less. For best performance at all frequencies, the value
for fOSC should be the master oscillator frequency (N=1)
when VIN is at the lowest level.
Table 2. Variation of VRES for Various Values of RIN || RSET
RIN || RSET (VIN = V+)
VRES, V+ = 3V
VRES, V+ = 5V
10k
0.98V
1.06V
20k
1.03V
1.11V
40k
1.09V
1.17V
80k
1.13V
1.21V
160k
1.16V
1.24V
VRES = Voltage across RSET
Note: All of the calculations above assume VRES = 1.1V, although VRES ≈ 1.1V. For completeness,
Table 2 shows the variation of VRES against various parallel combinations of RIN and RSET
(VIN = V+). Calulate first with VRES ≈ 1.1V, then use Table 2 to get a better approximation of
VRES, then recalculate the resistor values using the new value for VRES.
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