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LTC6930 データシート(PDF) 20 Page - Linear Technology

部品番号 LTC6930
部品情報  TimerBlox: Long Timer, Low Frequency Oscillator
PDF  28 Pages
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メーカー  LINER [Linear Technology]
ホームページ  http://www.linear.com
Logo LINER - Linear Technology

LTC6930 データシート(HTML) 20 Page - Linear Technology

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LTC6995-1/LTC6995-2
20
699512f
For more information www.linear.com/6995
Digital Frequency Control
The control voltage can be generated by a DAC (digital-
to-analog converter), resulting in a digitally-controlled
frequency. Many DACs allow for the use of an external
reference. If such a DAC is used to provide the VCTRL
voltage, the VSET dependency can be eliminated by buffer-
ing VSET and using it as the DAC’s reference voltage, as
shown in Figure 21. The DAC’s output voltage now tracks
any VSET variation and eliminates it as an error source.
The SET pin cannot be tied directly to the reference input
of the DAC because the current drawn by the DAC’s REF
input would affect the frequency.
ISET Extremes (Master Oscillator Frequency Extremes)
When operating with ISET outside of the recommended
1.25µA to 20µA range, the master oscillator operates
outside of the 62.5kHz to 1MHz range in which it is most
accurate.
The oscillator can still function with reduced accuracy for
ISET<1.25µA.Atapproximately500nA,theoscillatoroutput
will be frozen in its current state. The output could halt in
a high or low state. This avoids introducing short pulses
when frequency modulating a very low frequency output.
At the other extreme, it is not recommended to operate
the master oscillator beyond 2MHz because the accuracy
of the DIV pin ADC will suffer.
applicaTions inForMaTion
LTC6995-1
2.25V TO 5.5V
0.1µF
OUT
R1
1M
R2
523k
RSET
178k
RST
GND
SET
OUT
V+
DIV
CPW
470pF
RPW
2.26k
699512 F19a
60 SECONDS
1µs PULSE WIDTH
VRST(RISING)
V+
tPULSE = –RPW • CPW • In
tPULSE ≈ –2.26kΩ • 470pF • In(1 – 0.61)
tPULSE ≈ 1µs
1–
(
)
LTC6995-2
2.25V TO 5.5V
0.1µF
699512 F19b
OUT
R1
523k
R2
1M
60 SECONDS
0.9µs PULSE WIDTH
VRST(FALLING)
V+
tPULSE = –RPW • CPW • In
tPULSE ≈ –2.26kΩ • 470pF • In(0.43)
tPULSE ≈ 0.9µs
RSET
178k
RST
GND
SET
OUT
V+
DIV
CPW
470pF
RPW
2.26k
(
)
699512 F20
LTC6995-1
RST
GND
SET
OUT
V+
DIV
R1
C1
0.1µF
R2
RSET
RVCO
VCTRL
V+
Figure 19a. Self-Resetting Circuit (DIVCODE = 4)
Figure 19b. Self-Resetting Circuit (DIVCODE = 11)
Figure 20. Voltage-Controlled Oscillator



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