LTC1799CS5 Linear Technology, LTC1799CS5 Datasheet - Page 10
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LTC1799CS5
Manufacturer Part Number
LTC1799CS5
Description
Manufacturer
Linear Technology
Type
Silicon Oscillatorr
Datasheet
1.LTC1799CS5.pdf
(12 pages)
Specifications of LTC1799CS5
Mounting Style
Surface Mount
Screening Level
Commercial
Product Length (mm)
2.9mm
Product Depth (mm)
1.75mm
Product Height (mm)
0.9mm
Package / Case
TSOT-23
Lead Free Status / RoHS Status
Not Compliant
Available stocks
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Part Number
Manufacturer
Quantity
Price
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Quantity:
380
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Part Number:
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Part Number:
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Quantity:
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LTC1799
Once R
Maximum VCO Modulation Bandwidth
The maximum VCO modulation bandwidth is 10kHz; that
is, the LTC6900 will respond to changes in V
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
TYPICAL APPLICATIO S
0.1µF
10
C1
R
⎡
⎢
⎢
⎢
⎢
⎣
(
SET
3V
V
IN MAX
IN
(
=
/R
R
SET
10
SET
800Hz ≤ f
80Hz ≤ f
)
1
2
3
MHz
N
−
V
GND
SET
is known, calculate R
V
LTC1799
+
V
RES
SINE
+
SINE
OUT
•
DIV
)
≤ 800Hz, N = 100
⎛
⎜
⎝
f
≤ 8kHz, N = 10
+
OSC MAX
R
SW1
R
5
4
V
SET
10
0.1µF
RES
IN
3V
(
C2
OPEN, N = 10
k
⎞
⎟
⎠
3V, N = 100
⎛
⎜
⎝
3V
1
)
+
•
R
f
R
U
Low Power 80Hz to 8kHz Sine Wave Generator (I
OSC
SET
IN
16
10
15
1
2
7
8
9
SET
CLOCK A
ENABLE A
V
ENABLE B
RESET A
V
CLOCK B
RESET B
⎞
⎟
⎠
DD
SS
⎤
⎥
⎥
⎥
⎥
⎦
74HC4520
from:
IN
at a rate up
Q1A
Q2A
Q3A
Q4A
Q1B
Q2B
Q3B
Q4B
3
4
5
6
11
12
13
14
÷128
÷256
÷16
÷32
÷64
÷2
÷4
÷8
(3)
1µF
C4
f
100k
OSC
R11
64
is the master oscillator frequency divided by 20, (f
In general, for minimum output jitter the modulation
frequency should be limited to f
ever is less. For best performance at all frequencies, the
value for f
(N = 1) 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 VRES against various parallel combinations of R
(V
then recalculate the resistor values using the new value for V
IN
RES
IN
= V
|| R
= Voltage across R
R61
+
10k
). Calulate first with V
SET
0.1µF
3V
C3
R31 51.1k
(V
R51 5.11k
R21 20k
IN
OSC
A STOPBAND NOTCH AT THE 3rd HARMONIC
= V
CLOCK-TUNABLE LOWPASS FILTER WITH
should be the master oscillator frequency
+
Q
IN
)
< 4mA)
is at the lowest level.
1
2
3
4
5
6
7
8
RES
SET
V
NC
V
SA
LPA
BPA
HPA/NA
INV A
RES
≈ 1.1V, then use Table 2 to get a better approximation of V
+
+
LTC1067-50
(
V
R
R
f
OSC
L1
64
for Various Values of R
H1
RES
51.1k
249k
HPB/NB
0.98V
1.03V
1.09V
1.13V
1.16V
• 3
, V
RES
AGND
INV B
)
BPB
CLK
LPB
SB
+
V
= 1.1V, although V
–
= 3V
16
15
14
13
12
11
10
9
OSC
R32 51.1k
R22 20k
/20 or 10kHz, which-
RES
R62 14k
.
R52
5.11k
RES
V
≈ 1.1V. For completeness,
RES
1799 TA05
IN
f
SINE
SINEWAVE
OUT
1.06V
1.11V
1.17V
1.21V
1.24V
, V
|| R
=
+
sn1799 1799fbs
10MHz
SET
= 5V
OSC
N
IN
and R
•
/20).
64R
10k
RES
SET
SET
,