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參數(shù)資料
| 型號： | LT1061 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | High Performance Triple Universal Filter Building Block(高性能通用型三濾波器組件) |
| 中文描述： | 三高性能通用濾波器積木（高性能通用型三濾波器組件） |
| 文件頁數(shù)： | 6/16頁 |
| 文件大?。?/td> | 290K |
| 代理商： | LT1061 |
6
LTC1061
PU
U U
U U
Clock Feedthrough
This is defined as the amplitude of the clock frequency
appearing at the output pins of the device, Figure 2. Clock
feedthrough is measured with all three sides of the LTC1061
connected as filters. The clock feedthrough mainly de-
pends on the magnitude of the power supplies and it is
independent from the input clock levels, clock frequency
and modes of operation.
The Table 2 illustrates the typical clock feedthrough num-
bers for various power supplies.
Figure 1. the 6th Order LP Butterworth Filter of Figure 5
Operating with a Single 5V Supply.
20
19
18
17
16
15
14
13
12
11
1
2
3
4
5
6
7
8
9
10
R3
V
OUT
R1
V
IN
0.1
μ
F
LTC1061 F01
LTC1061
+
R2
R1
R3
R2
R4
R1
R3
R2
T
2
L CLOCK
IN
f
CLK
< 1MHz
1
μ
F
5V
2.49k
2.49k
C
IN
50/100/Hold (Pin 7)
By tying Pin 7 to V
+
, the filter operates with a clock-to-
center frequency internally set at 50:1. When Pin 7 is at
mid-supplies, the filter operates with a 100:1 clock-to-
center frequency ratio. Table 1 shows the allowable varia-
tion of the potential at Pin 7 when the 100:1 mode is
sought.
When Pin 7 is shorted to the negative supply pin, the filter
operation is stopped and the bandpass and lowpass
output act as a sample-and-hold circuit holding the last
sample of the input voltage. The hold step is around 2mV
and the droop rate is 150
μ
V/sec.
Table 1
TOTAL POWER SUPPLY
(V)
VOLTAGE RANGE OF PIN 7
FOR 100:1 OPERATION (V)
5
2.5
±
0.5
5
±
1
7.5
±
1.5
10
15
Figure 2. Typical Clock Feedthrogh of the LTC1061 Operating
with
±
5V Supplies. Top Trace is the Input Clock Swinging 0V to
5V and Bottom Trace is One of the Lowpass Outputs with Zero or
DC Input Signals.
A = 2V/DIV
B = 10mV/DIV
HORIZONTAL = 10
μ
s/DIV
POWER SUPPLY (V)
CLOCK FEEDTHROUGH (V
RMS
)
0.2
0.4
0.8
±
2.5
±
5
±
8
Table 2
Definition of Filter Functions
Refer to LTC1060 data sheet.
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