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LTC6990CS6PBF Datasheet(PDF) 18 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) 18 Page - Linear Technology

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LTC6990
18
6990f
APPLICATIONS INFORMATION
Depending on the application’s requirements, the non-
inverting VCO circuit in Figure 13 may be preferred for
this wide of a frequency variation as its maximum inac-
curacy due to VSET error is only ±9% and can be reduced
to only ±3% with a small change to the voltage tuning
range specification.
Reducing VSET Error Effects in VCO Applications
Figure 13 shows a VCO that reduces the effect of
ΔVSET
by adding an op-amp to make VCTRL dependent on VSET.
This circuit also has a positive transfer function (the out-
put frequency increases as VIN increases). Furthermore,
for positive VIN voltages, this circuit places the greatest
absolute frequency error at the highest output frequency.
Compared to the simple VCO circuit of Figure 11, the
absolute frequency error is unchanged. However, with
the maximum absolute frequency error (in Hertz) now
occurring at the highest output frequency, the relative
frequency error (in percent) is greatly improved.
Additionally, by choosing the VCO’s specifications shrewdly,
the frequency error (in percent) due to VSET variation is
reduced to
ΔVSET/VSET = ±3%. To realize this improve-
ment, the design must abide by three conditions. First,
the VIN voltage must be positive throughout the range.
Second, choose VMAX/VMIN ≥ fMAX/fMIN. Last, choose
RVCO/RSET ≥ R4/R3.
Figure 13 shows a design similar to the previous design
example where the VMIN voltage is now specified to be
0.4V. This satisfies the VMAX/VMIN ≥ fMAX/fMIN condition
and the design assures that the output frequency error
due to VSET variation is only ±3%.
Figure 13. VCO with Reduced
ΔVSET Sensitivity
6990 F13
LTC6990
OE
GND
SET
OUT
V+
DIV
C1
0.1μF
R1
1M
R2
280k
DIVCODE = 3
(NDIV = 8, Hi-Z = 0)
RSET
249k
3V
RVCO
75k
+
3V
3V
10kHz TO 100kHz
fOUT
VCTRL
VSET
1/2
LTC6078
R4
30.1k
C4
33pF
R3
100k
0.4V TO 4V
VIN
fOUT
1MHz • 50k
NDIV •RVCO
RVCO
RSET
VIN
VSET
1 •
R4
R3
IF
R4
R3
RVCO
RSET
, THE EQUATION REDUCES TO:
fOUT =
1MHz • 50k
NDIV •RSET
VIN
VSET
VIN •25kHz/V


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