參數(shù)資料
型號(hào)： LTC1264-7M
廠商： Linear Technology Corporation
英文描述： Linear Phase, Group Delay Equalized, 8th Order Lowpass Filter
中文描述： 線性相位，群時(shí)延均衡，8階低通濾波器
文件頁(yè)數(shù)： 11/12頁(yè)
文件大小： 301K
代理商： LTC1264-7M
11
LTC1264-7
U
S
A
Table 9. Maximum V
IN
vs V
S
and Clock
O
PPLICATI
U
U
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
Aliasing
Aliasing is an inherent phenomenon of sampled data
systems and it occurs when input frequencies close to the
sampling frequency are applied. For the LTC1264-7 case
at 50:1, an input signal whose frequency is in the range of
f
CLK
±
10%, will be aliased back into the filter’s passband.
If, for instance, an LTC1264-7 operating with a 100kHz
clock and 2kHz cutoff frequency receives a 95kHz 10mV
input signal, a 5kHz 56
μ
V
RMS
alias signal will appear at its
output. When the LTC1264-7 operates with a clock-to-
cutoff frequency of 25:1, aliasing occurs at twice the clock
frequency. Table 10 shows details.
Table 10. Aliasing (f
CLK
= 100kHz )
INPUT FREQUENCY
(V
IN
= 1V
RMS
,
f
IN
= f
CLK
±
f
OUT
)
(kHz)
25:1, f
CUTOFF
= 4kHz
175 (or 225)
180 (or 220)
185 (or 215)
190 (or 210)
195 (or 205)
50:1, f
CUTOFF
= 2kHz
75 (or 125)
80 (or 120)
85 (or 115)
90 (or 110)
95 (or 105)
99 (or 101)
OUTPUT LEVEL
(Relative to Input,
0dB = 1V
RMS
)
(dB)
OUTPUT FREQUENCY
(Aliased Frequency
f
OUT
= ABS [f
CLK
±
f
IN
])
(kHz)
–76
–69
–62
–43
–7
25
20
15
10
5
–96
–90
–82
–72
–45
25
20
15
10
5
1
0
POWER SUPPLY
±
7.5V
MAXIMUM f
CLK
5.0MHz
4.5MHz
4.0MHz
≥
3.5MHz
3.0MHz
≥
3.0MHz
2.0MHz
MAXIMUM V
IN
1.6V
RMS
(f
IN
≥
160kHz)
2.0V
RMS
(f
IN
≥
160kHz)
2.5V
RMS
(f
IN
≥
160kHz)
1.6V
RMS
(f
IN
≥
500kHz)
1.6V
RMS
(f
IN
≥
100kHz)
0.7V
RMS
(f
IN
≥
500kHz)
0.5V
RMS
(f
IN
≥
400kHz)
±
5V
Single 5V
Transient Response
INPUT = 10kHz
±
3V
f
= 2.5MHz
RATIO = 25:1
INPUT
90%
50%
10%
OUTPUT
tr
td
ts
1164-7 F06
RISE TIME (t
r
) = f
CUTOFF
SETTLING TIME (t
s
) = f
(TO 1% of OUTPUT)
TIME DELAY (t
d
) = GROUP DEL
≈
f
(TO 50% OF OUTPUT)
CUTOFF
CUTOFF
Figure 6.
Table 11. Transient Response of LTC Lowpass Filters
DELAY
TIME*
(SEC)
0.50/f
C
0.43/f
C
0.43/f
C
1.15/f
C
1.20/f
C
1.20/f
C
0.80/f
C
0.85/f
C
0.90/f
C
0.85/f
C
RISE
TIME**
(SEC)
0.34/f
C
0.34/f
C
0.34/f
C
0.36/f
C
0.39/f
C
0.39/f
C
0.48/f
C
0.54/f
C
0.54/f
C
0.54/f
C
SETTLING OVER-
TIME***
(SEC)
0.80/f
C
0.85/f
C
1.15/f
C
2.05/f
C
2.20/f
C
2.20/f
C
2.40/f
C
4.30/f
C
4.50/f
C
6.50/f
C
SHOOT
(%)
0.5
0
1
5
5
5
11
18
20
20
LOWPASS FILTER
LTC1064-3 Bessel
LTC1164-5 Bessel
LTC1164-6 Bessel
LTC1264-7 Linear Phase
LTC1164-7 Linear Phase
LTC1064-7 Linear Phase
LTC1164-5 Butterworth
LTC1164-6 Elliptic
LTC1064-4 Elliptic
LTC1064-1 Elliptic
* To 50%
±
5%, ** 10% to 90%
±
5%, *** To 1%
±
0.5%
Figure 5.
2
10
μ
s/DIV
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