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LTC1069-1

更新时间： 2022-11-25 12:22:29
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
8页 242K
描述
Low Power, 8th Order Progressive Elliptic, Lowpass Filter

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LTC1069-1 数据手册

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LTC1069-1  
U
W U U  
APPLICATIONS INFORMATION  
the input pin (4) shorted to the AGND pin and depends on  
PC board layout and on the value of the power supplies.  
With proper layout techniques the values of the clock  
feedthrough are shown on Table 2.  
supplyvoltage(seeTable3). Theclockfeedthroughspeci-  
fications are not part of the wideband noise.  
Table 3. Wideband Noise  
V
WIDEBAND NOISE  
S
3.3V  
5V  
±5V  
100µV  
108µV  
112µV  
Table 2. Clock Feedthrough  
RMS  
RMS  
RMS  
V
CLOCK FEEDTHROUGH  
S
3.3V  
5V  
10µV  
40µV  
RMS  
RMS  
Aliasing  
±5V  
160µV  
RMS  
Aliasing is an inherent phenomenon of sampled data  
systems and it occurs for input frequencies approaching  
the sampling frequency. The internal sampling frequency  
of the LTC1069-1 is 100 times its cutoff frequency. For  
instance, if a 98kHz, 100mVRMS signal is applied at the  
input of an LTC1069-1 operating with a 100kHz clock, a  
2kHz, 28µVRMS alias signal will appear at the filter output.  
Table 4 shows details.  
Any parasitic switching transients during the rise and fall  
edges of the incoming clock are not part of the clock  
feedthroughspecifications.Switchingtransientshavefre-  
quency contents much higher than the applied clock; their  
amplitude strongly depends on scope probing techniques  
as well as grounding and power supply bypassing. The  
clock feedthrough can be reduced, if bothersome, by  
addingasingleRClowpassfilterattheoutputpin(8)ofthe  
LTC1069-1.  
Table 4. Aliasing (fCLK = 100kHz)  
INPUT FREQUENCY  
(V = 1V  
OUTPUT LEVEL  
(Relative to Input)  
(dB)  
OUTPUT FREQUENCY  
(Aliased Frequency)  
(kHz)  
)
RMS  
IN  
Wideband Noise  
(kHz)  
/f = 100:1, f = 1kHz  
CUTOFF  
f
The wideband noise of the filter is the total RMS value of  
the device’s noise spectral density and determines the  
operating signal-to-noise ratio. Most of the wideband  
noise frequency contents lie within the filter passband.  
The wideband noise cannot be reduced by adding post  
filtering. Thetotalwidebandnoiseisnearlyindependentof  
the clock frequency and depends slightly on the power  
CLK  
C
96 (or 104)  
97 (or 103)  
98 (or 102)  
985. (or 101.5)  
99 (or 101)  
99.5 (or 100.5)  
–90.0  
–86.0  
–71.0  
–56.0  
–1.1  
4.0  
3.0  
2.0  
1.5  
1.0  
0.5  
–0.21  
U
TYPICAL APPLICATIONS  
Single 3.3V Supply Operation with Output Buffer  
Single 5V Operation with Power Shutdown  
3.3V  
5V  
SHUTDOWN  
ON  
CMOS LOGIC  
0.1µF  
1
2
3
4
8
7
6
5
AGND  
V
V
OUT  
OUT  
1
2
3
4
8
AGND  
V
OUT  
+
+
–
0.47µF  
0.47µF  
0.1µF  
V
V
7
6
5
1/2 LT1366  
+
–
V
OUT  
V
V
LTC1069-1  
NC  
0.1µF  
LTC1069-1  
NC  
NC  
–
NC  
f
≤
CLK  
750kHz  
5V  
V
IN  
V
CLK  
IN  
f
CLK  
500kHz  
3.3V  
0V  
1069-1 TA05  
0V  
V
V
CLK  
IN  
IN  
1069-1 TA04  
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-  
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.  
7
1...45678

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