LTC1799CS5 Linear Technology, LTC1799CS5 Datasheet - Page 10

• Manufacturer Part Number: LTC1799CS5
• Manufacturer: Linear Technology
• Type: Silicon Oscillatorr

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

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
,