LTC1569CS8-6#PBF Linear Technology, LTC1569CS8-6#PBF Datasheet - Page 7

• Manufacturer Part Number: LTC1569CS8-6#PBF
• Description: IC FILTER 10TH ORDR LOWPASS8SOIC
• Manufacturer: Linear Technology

Specifications of LTC1569CS8-6#PBF

• Filter Type: Linear Phase, Lowpass Switched Capacitor
• Frequency - Cutoff Or Center: 300kHz
• Number Of Filters: 1
• Max-order: 10th
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Supply: -

APPLICATIONS
Example 2: LTC1569-6, R
mode, DIV/CLK (Pin 5) connected to V
Using the equation in Figure 1, the approximate filter
cutoff frequency is f
• (1/16) = 2kHz.
For a more precise f
a value of f
in Figure 6 to find the correct divide ratio when V
and R
= 32kHz • (20.18k/20k) • (1/16.02) = 2.01kHz.
From Table 1, the part-to-part variation of f
be 2%. From the graph in Figure 7, the 0 C to 70 C
drift of f
EXT
CUTOFF
= 20k. Based on Table 1 and Figure 6, f
1.04
1.03
1.02
1.01
1.00
0.99
0.98
0.97
0.96
4.08
4.04
4.00
3.96
Figure 4. Typical Divide Ratio in the
Divide-by-4 Mode, T
CUTOFF
Figure 2. Filter Cutoff vs V
Divide-by-1 Mode, T
2
2
will be – 0.2% to 0.2%.
U
R
R
R
R
R
R
R
R
when R
EXT
EXT
EXT
EXT
EXT
EXT
EXT
EXT
CUTOFF
4
4
= 5k
= 10k
= 20k
= 40k
= 5k
= 10k
= 20k
= 40k
INFORMATION
CUTOFF
EXT
U
V
V
SUPPLY
SUPPLY
EXT
estimate, use Table 1 to get
= 10k, V
6
6
A
A
= 25 C
= 20k and use the graph
(V)
(V)
= 25 C
= 64kHz • (10k/20k)
W
SUPPLY
–
S
8
8
(Pin 4), T
= 5V, divide-by-1
1569-6 F02
1569-6 F04
,
10
10
CUTOFF
U
A
= 25 C.
CUTOFF
S
= 3V
will
The oscillator is sensitive to transients on the positive
supply. The IC should be soldered to the PC board and the
PCB layout should include a 1 F ceramic capacitor be-
tween V
the IC to minimize inductance. Avoid parasitic capacitance
on R
Using the equation in Figure 1, the approximate filter
cutoff frequency is f
• (1/1) = 64kHz.
For a more precise f
correct for the supply voltage when V
Table 1 and Figure 2, f
= 62.1kHz.
X
and avoid routing noisy signals near R
+
(Pin 7) and V
Figure 3. Filter Cutoff vs Temperature,
Divide-by-1 Mode, R
Figure 5. Filter Cutoff vs Temperature,
Divide-by-4 Mode, R
1.010
1.008
1.006
1.004
1.002
1.000
0.998
0.996
0.994
0.992
0.990
1.010
1.008
1.006
1.004
1.002
1.000
0.998
0.996
0.994
0.992
0.990
–50
–50
–25
–25
V
V
V
V
V
V
S
S
S
S
S
S
= 3V
= 5V
= 10V
= 3V
= 5V
= 10V
–
CUTOFF
TEMPERATURE ( C)
TEMPERATURE ( C)
CUTOFF
(Pin 4) , as close as possible to
0
0
CUTOFF
EXT
EXT
25
25
estimate, use Figure 2 to
= 64k • (10k/10k) • 0.970
= 10k
= 10k
= 64kHz • (10k/10k)
50
50
LTC1569-6
75
75
1569-6 F03
1569-6 F05
S
X
100
100
= 5V. From
(Pin 6). Use
7