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LTC6990CS6PBF Datasheet(PDF) 20 Page - Linear Technology

Part No. LTC6990CS6PBF
Description  TimerBlox: Voltage Controlled Silicon Oscillator
Download  28 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC6990CS6PBF Datasheet(HTML) 20 Page - Linear Technology

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LTC6990
20
6990f
APPLICATIONS INFORMATION
Modulation Bandwidth and Settling Time
The LTC6990 will respond to changes in ISET up to a –3dB
bandwidth of 0.4 • fOUT (see Figure 15). This makes it easy
to stabilize a feedback loop around the LTC6990, since it
does not introduce a low-frequency pole.
Settling time depends on the master oscillator frequency.
Following a 2x or 0.5x step change in ISET, the output
frequency takes approximately six master clock cycles
(6 • tMASTER) to settle to within 1% of the final value. An
example is shown in Figure 16.
Power Supply Current
The power supply current varies with frequency, supply
voltage and output loading. It can be estimated under any
condition using the following equation:
IS(TYP) ≈ V+•fMASTER •7pF + V+•fOUT•(13pF +CLOAD)
+ V
+
480kΩ
+
V+
2•RLOAD
+ 1.75 •ISET + 50µA
The equation is also valid for OE = 0 (output disabled),
with fOUT = 0Hz.
Figure 15. Modulation Frequency Response
Figure 16. Settling Time
fMOD/fOUT (Hz/Hz)
0.1
0
–20
–30
–10
–40
1
6990 F15
10
VCTRL = 0.536V + 0.278V
• SIN(2π•fMOD•t)
fOUT =18.75kHz ±10%
–3dB AT 0.4•fOUT
RSET = 200k
RVCO = 464k
DIVCODE = 4(÷16)
10μs/DIV
6990 F16
VCTRL
2V/DIV
fOUT
50kHz/DIV
OUT
2V/DIV
V+ = 3.3V, DIVCODE = 0
RSET = 200k, RVCO = 464k
fOUT = 175kHz AND 350kHz


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