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參數(shù)資料
| 型號： | LTC1264CSW |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 運(yùn)動控制電子 |
| 英文描述： | High Speed, Quad Universal Filter Building Block |
| 中文描述： | QUAD SWITCHED CAPACITOR FILTER, BUTTERWORTH/CHEBYSHEV, UNIVERSAL, PDSO24 |
| 封裝： | 0.300 INCH, PLASTIC, SOP-24 |
| 文件頁數(shù)： | 5/16頁 |
| 文件大?。?/td> | 227K |
| 代理商： | LTC1264CSW |
5
LTC1264
1264fb
V
+
, V
–
(Pins 7, 19):
Power Supply Pins. The V
+
(Pin 7) and
the V
–
(Pin 19) should each be bypassed with a 0.1
μ
F
capacitor to an adequate analog ground. The filter’s power
supplies should be isolated from other digital or high
voltage analog supplies. A low noise linear supply is
recommended. Using a switching power supply will lower
the signal-to-noise ratio of the filter. The supply during
power-up should have a slew rate less than 1V/
μ
s. When
V
+
is applied before V
–
and V
–
is allowed to go above
ground, a diode should clamp V
–
to prevent latch-up.
Figures 1 and 2 show typical connections for dual and
single supply operation.
AGND (Pin 6):
Analog Ground Pin. The filter performance
depends on the quality of the analog signal ground. For
either dual or single supply operation, an analog ground
plane surrounding the package is recommended. The
analog ground plane should be connected to any digital
ground at a single point. For dual supply operation, Pin 6
should be connected to the analog ground plane. For
single supply operation, Pin 6 should be biased at 1/2
supply and should be bypassed to the analog ground plane
with at least a 1
μ
F capacitor (Figure 2). For single 5V
operation and f
CLK
greater than 1MHz, pin 6 should be
biased at 2V. This minimizes passband gain and phase
variations.
Figure 2. Single Supply Ground Plane Connections
Figure 1. Dual Supply Ground Plane Connections
1
μ
F
1264 F02
200
V
+
LTC1264
CLOCK
SOURCE
ANALOG
GROUND
PLANE
24
23
22
21
20
*
19
18
17
*
16
15
14
13
1
2
3
4
*
5
6
7
*
8
9
10
11
12
DIGITAL
GROUND
PLANE
5k
V
+
/2
5k
V
+
*
FOR MODE 3, THE S NODE PINS 5, 8,
17, 20 SHOULD BE TIED TO PIN 6
STAR
SYSTEM
GROUND
+
0.1
μ
F
–7.5V
1264 F01
200
7.5V
LTC1264
CLOCK
SOURCE
0.1
μ
F
ANALOG
GROUND
PLANE
24
23
22
21
20
19
18
17
16
15
14
13
1
2
3
4
5
6
7
8
9
10
11
12
STAR
SYSTEM
GROUND
DIGITAL
GROUND
PLANE
*
*
OPTIONAL, 1N4148, 1N5819
PI FU
U
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