參數(shù)資料
型號: LTC1264-7CSW#TRPBF
廠商: Linear Technology
文件頁數(shù): 5/16頁
文件大小: 0K
描述: IC FILTER 8TH ORDR LOWPASS16SOIC
標(biāo)準(zhǔn)包裝: 1,000
濾波器類型: 線性相位,低通開關(guān)電容器
頻率 - 截止或中心: 200kHz
濾波器數(shù): 1
濾波器階數(shù): 8th
電源電壓: ±2.37 V ~ 8 V
安裝類型: 表面貼裝
封裝/外殼: 16-SOIC(0.295",7.50mm 寬)
供應(yīng)商設(shè)備封裝: 16-SOIC
包裝: 帶卷 (TR)
LTC1264-7
12647fa
13
U
S
A
O
PPLICATI
WU
U
I FOR ATIO
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
fCLK ±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
VRMS 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 (fCLK = 100kHz)
INPUT FREQUENCY
OUTPUT LEVEL
OUTPUT FREQUENCY
(VIN = 1VRMS,
(Relative to Input,
(Aliased Frequency
fIN = fCLK ± fOUT)
0dB = 1VRMS)fOUT = ABS [fCLK ± fIN])
(kHz)
(dB)
(kHz)
25:1, fCUTOFF = 4kHz
175 (or 225)
–76
25
180 (or 220)
– 69
20
185 (or 215)
– 62
15
190 (or 210)
– 43
10
195 (or 205)
– 7
5
50:1, fCUTOFF = 2kHz
75 (or 125)
–96
25
80 (or 120)
– 90
20
85 (or 115)
– 82
15
90 (or 110)
– 72
10
95 (or 105)
– 45
5
99 (or 101)
0
1
Table 9. Maximum VIN vs VS and Clock
POWER SUPPLY
MAXIMUM fCLK
MAXIMUM VIN
±7.5V
5.0MHz
1.6VRMS (fIN ≥ 160kHz)
4.5MHz
2.0VRMS (fIN ≥ 160kHz)
4.0MHz
2.5VRMS (fIN ≥ 160kHz)
≥ 3.5MHz
1.6VRMS (fIN ≥ 500kHz)
±5V
3.0MHz
1.6VRMS (fIN ≥ 100kHz)
≥ 3.0MHz
0.7VRMS (fIN ≥ 500kHz)
Single 5V
2.0MHz
0.5VRMS (fIN ≥ 400kHz)
Transient Response
2V/DIV
INPUT = 10kHz
± 3V
fCLK = 2.5MHz
RATIO = 25:1
INPUT
90%
50%
10%
OUTPUT
tr
td
ts
1164-7 F06
RISE TIME (tr) =
±5%
0.36
fCUTOFF
SETTLING TIME (ts) =
±5%
(TO 1% of OUTPUT)
2
fCUTOFF
TIME DELAY (td) = GROUP DELAY ≈
(TO 50% OF OUTPUT)
1.15
fCUTOFF
Figure 6
Table 11. Transient Response of LTC Lowpass Filters
DELAY
RISE
SETTLING OVER-
TIME*
TIME**
TIME***
SHOOT
LOWPASS FILTER
(SEC)
(%)
LTC1064-3 Bessel
0.50/fC
0.34/fC
0.80/fC
0.5
LTC1164-5 Bessel
0.43/fC
0.34/fC
0.85/fC
0
LTC1164-6 Bessel
0.43/fC
0.34/fC
1.15/fC
1
LTC1264-7 Linear Phase
1.15/fC
0.36/fC
2.05/fC
5
LTC1164-7 Linear Phase
1.20/fC
0.39/fC
2.20/fC
5
LTC1064-7 Linear Phase
1.20/fC
0.39/fC
2.20/fC
5
LTC1164-5 Butterworth
0.80/fC
0.48/fC
2.40/fC
11
LTC1164-6 Elliptic
0.85/fC
0.54/fC
4.30/fC
18
LTC1064-4 Elliptic
0.90/fC
0.54/fC
4.50/fC
20
LTC1064-1 Elliptic
0.85/fC
0.54/fC
6.50/fC
20
* To 50%
±5%, ** 10% to 90% ±5%, *** To 1% ±0.5%
10
s/DIV
Figure 5
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