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參數(shù)資料
| 型號： | LTC1569-6 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Linear Phase, DC Accurate, Low Power, 10th Order Lowpass Filter |
| 中文描述： | 線性相位，直流精確度，低功耗，第10階低通濾波器 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 217K |
| 代理商： | LTC1569-6 |
7
LTC1569-6
APPLICATIO
S I
N
FOR
ATIO
U
W
U
Figure 6. Typical Divide Ratio in the
Divide-by-16 Mode, T
A
= 25
°
C
Figure 7. Filter Cutoff vs Temperature,
Divide-by-16 Mode, R
EXT
= 10k
TEMPERATURE (
°
C)
–50
N
1569-6 F07
1.010
1.008
1.006
1.004
1.002
1.000
0.998
0.996
0.994
0.992
0.990
–25
0
25
50
75
100
V
S
= 3V
V
S
= 5V
V
S
= 10V
V
SUPPLY
(V)
2
D
1569-6 F06
16.32
16.16
16.00
15.84
4
6
8
10
R
EXT
= 5k
R
EXT
= 10k
R
EXT
= 20k
R
EXT
= 40k
Example 1: LTC1569-6, R
EXT
= 20k, V
S
= 3V, divide-by-16
mode, DIV/CLK (Pin5) connected to V
+
(Pin 7), T
A
= 25
°
C.
Using the equation in Figure 1, the approximate filter
cutoff frequency is f
CUTOFF
= 64kHz (10k/20k)
(1/16) = 2kHz.
For a more precise f
CUTOFF
estimate, use Table 1 to get
a value of f
CUTOFF
when R
EXT
= 20k and use the graph
in Figure 6 to find the correct divide ratio when V
S
= 3V
and R
EXT
= 20k. Based on Table 1 and Figure 6, f
CUTOFF
= 32kHz (20.18k/20k) (1/16.02) = 2.01kHz.
From Table 1, the part-to-part variation of f
CUTOFF
will
be
±
2%. From the graph in Figure 7, the 0
°
C to 70
°
C
drift of f
CUTOFF
will be –0.2% to 0.2%.
Example 2: LTC1569-6, R
EXT
= 10k, V
S
= 5V, divide-by-1
mode, DIV/CLK (Pin5) connected to V
–
(Pin 4), T
A
= 25
°
C.
Using the equation in Figure 1, the approximate filter
cutoff frequency is f
CUTOFF
= 64kHz (10k/10k)
(1/1) = 64kHz.
For a more precise f
CUTOFF
estimate, use Figure 2 to
correct for the supply voltage when V
S
= 5V. From
Table1 and Figure 2, f
CUTOFF
= 64k (10k/10k) 0.970
= 62.1kHz.
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
μ
F ceramic capacitor be-
tween V
+
(Pin 7) and V
–
(Pin 4) , as close as possible to
the IC to minimize inductance. Avoid parasitic capacitance
on R
X
and avoid routing noisy signals near R
X
(Pin 6). Use
a ground plane connected to V
–
(Pin 4) for single supply
applications. Connect a ground plane to GND (Pin 3) for
dual supply applications and connect V
–
(Pin 4) to a
copper trace with low thermal resistance.
Input and Output Voltage Range
The input signal range includes the full power supply
range. For a single 3V supply, the output voltage swing is
typciallly 2.1V
P-P
and at least 1.9V
P-P
over the commercial
temperature range. For single 5V and
±
5V supplies, the
output swing depends on clock frequency and divider
setting.
For R
EXT
= 10k, divide-by-1 mode (f
CUTOFF
= 64kHz) and
V
S
= 5V, the output swing is typically 3.6V
P-P
(3.2V
P-P
0
°
C to 70
°
C). For R
EXT
= 10k, divide-by-4 or
divide-by-16 modes (f
CUTOFF
= 16kHz or 4kHz) and
V
S
= 5V, the output swing is typically limited to
V
MIN
= V
–
+ 80mV and V
MAX
= V
+
– 1V or 3.92V
P-P
.
For R
EXT
= 10k, divide-by-1 mode and V
S
=
±
5V, the output
voltage is typically 5V
P-P
(4.3V
P-P
0
°
C to 70
°
C). For
R
EXT
= 10k, divide-by-4 mode (f
CUTOFF
= 16kHz) and
V
S
=
±
5V, the output voltage range is typically 6.3V
P-P
(5.8V
P-P
0
°
C to 70
°
C). For R
EXT
= 10k, divide-by-16 mode
(f
CUTOFF
= 4kHz) and V
S
=
±
5V, the output voltage is
typically 8.5V
P-P
(7.5V
P-P
0
°
C to 70
°
C). In each case, the
output voltage range increases as R
EXT
is increased until
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