LTC1799CS5#TRPBF Linear Technology, LTC1799CS5#TRPBF Datasheet - Page 10

• Manufacturer Part Number: LTC1799CS5#TRPBF
• Description: ICREF LDO BANDGP MCRPWR TSOT23-5
• Manufacturer: Linear Technology
• Type: Oscillator, Siliconr

Specifications of LTC1799CS5#TRPBF

• Frequency: 33MHz
• Voltage - Supply: 2.7 V ~ 5.5 V
• Current - Supply: 7mA
• Operating Temperature: 0°C ~ 70°C
• Package / Case: TSOT-23-5, TSOT-5, TSOP-5
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Count: -

applicaTions inForMaTion
LTC1799
Once R
Maximum VCO Modulation Bandwidth
The maximum VCO modulation bandwidth is 10kHz; that
is, the LTC1799 will respond to changes in V
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
10
R







(
SET
V
IN(MAX)
IN
=
/R
10MHz
SET
N
− V
is known, calculate R
V
RES
+
•
)
f

 
OSC(MAX)
+ V
R
R
10k
SET
RES
IN

 

 
1+
•
R
R
SET
IN
SET

 







from:
IN
at a rate
(3)
is the master oscillator frequency divided by 20, (f
In general, for minimum output jitter the modulation fre-
quency should be limited to f
is less. For best performance at all frequencies, the value
for f
when V
Table 2. Variation of V
R
10k
20k
40k
80k
160k
V
Note: All of the calculations above assume V
Table 2 shows the variation of V
(V
V
RES
IN
RES
IN
= V
, then recalculate the resistor values using the new value for V
|| R
OSC
= Voltage across R
+
). Calulate first with V
SET
IN
should be the master oscillator frequency (N = 1)
(V
is at the lowest level.
IN
= V
+
)
RES
SET
RES
RES
≈ 1.1V, then use Table 2 to get a better approximation of
against various parallel combinations of R
for Various Values of R
V
RES
0.98V
1.03V
1.09V
1.13V
1.16V
RES
, V
= 1.1V, although V
OSC
+
= 3V
/20 or 10kHz, whichever
RES
RES
.
≈ 1.1V. For completeness,
V
IN
RES
|| R
1.06V
1.11V
1.17V
1.21V
1.24V
, V
IN
and R
SET
+
OSC
= 5V
SET
/20).
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