RISE TIME (tr)" />
參數(shù)資料
型號(hào)： LTC1066-1CSW#PBF
廠商： Linear Technology
文件頁(yè)數(shù)： 4/20頁(yè)
文件大?。?/td> 0K
描述： IC FILTR 8TH ORDR LOWPASS 18SOIC
標(biāo)準(zhǔn)包裝： 40
濾波器類型： 貝塞爾，低通開(kāi)關(guān)電容器
頻率 - 截止或中心： 50kHz
濾波器數(shù)： 1
濾波器階數(shù)： 8th
電源電壓： 4.75 V ~ 16 V，±2.375 V ~ 8 V
安裝類型： 表面貼裝
封裝/外殼： 18-SOIC（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝： 18-SOIC
包裝： 管件
產(chǎn)品目錄頁(yè)面： 1324 (CN2011-ZH PDF)
LTC1066-1
12
10661fa
INPUT
90%
50%
10%
OUTPUT
tr
td
ts
1066-1 F05
RISE TIME (tr)
SETTLING TIME (ts)
DELAY TIME (td)
50:1 ELLIPTIC
0.43
fCUTOFF
3.4
fCUTOFF
0.709
fCUTOFF
±5%
0.43
fCUTOFF
2.05
fCUTOFF
0.556
fCUTOFF
±5%
100:1 LINEAR PHASE
APPLICATIONS INFORMATION
WU
U
Transient Response and Settling Time
The LTC1066-1 exhibits two different transient behaviors.
First, during power-up the DC correcting loop will settle
after the voltage offset of the internal switched-capacitor
network is stored across the feedback capacitor CF (see
Block Diagram). It takes approximately five time constants
(5RFCF) for settling to 1%. Second, following DC loop
settling, the filter reaches steady state. The filter transient
response is then defined by the frequency characteristics
of the internal switched-capacitor lowpass filter. Figure 5
shows details.
DC loop settling is also observed if, at steady state, the DC
offset of the internal switched-capacitor network suddenly
changes. A sudden change may occur if the clock fre-
quency is instantaneously stepped to a value above 1MHz.
and on the value of the power supplies. With proper layout
techniques the values of the clock feedthrough are shown
on Table 7.
Table 7. Clock Feedthrough
POWER SUPPLY
50:1
100:1
Single 5V
70
VRMS
90
VRMS
±5V
100
VRMS
200
VRMS
±7.5V
160
VRMS
650
VRMS
Wideband Noise
The wideband noise of the filter is the total RMS value of
the device’s noise spectral density and is used to deter-
mine the operating signal-to-noise ratio. Most of its fre-
quency contents lie within the filter passband and cannot
be reduced with post filtering. For instance, the LTC1066-
1 wideband noise at
±5V supply is 100VRMS, 95VRMS of
which have frequency contents from DC up to the filter’s
cutoff frequency. The total wideband noise (
VRMS) is
nearly independent of the value of the clock. The clock
feedthrough specifications are not part of the wideband
noise. Table 8 lists the typical wideband noise for each
supply.
Table 8. Wideband Noise
POWER SUPPLY
50:1
100:1 (Pin 8 to GND)
Single 5V
90
VRMS
80
VRMS
±5V
100
VRMS
85
VRMS
±7.5V
106
VRMS
90
VRMS
Speed Limitations
To avoid op amp slew rate limiting at maximum clock
frequencies, the signal amplitude should be kept below a
specified level as shown in Table 9.
Table 9. Maximum VIN
INPUT FREQUENCY
MAXIMUM VIN
≥250kHz
0.50VRMS
≥700kHz
0.25VRMS
Clock Feedthrough
Clock feedthrough is defined as the RMS value of the clock
frequency and its harmonics that are present at the filter’s
output pin (9). The clock feedthrough is tested with the
input pin (2) grounded and depends on PC board layout
Figure 5. Transient Response
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