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參數(shù)資料
型號(hào)： LTC6605CDJC-7#TRPBF
廠商： Linear Technology
文件頁(yè)數(shù)： 9/20頁(yè)
文件大?。?/td> 0K
描述： IC FILTER 7MHZ DUAL 22-DFN
標(biāo)準(zhǔn)包裝： 2,500
濾波器類型： 抗混迭
頻率 - 截止或中心： 5MHz
濾波器數(shù)： 2
濾波器階數(shù)： 2nd
電源電壓： 2.7 V ~ 5.25 V
安裝類型： 表面貼裝
封裝/外殼： 22-WFDFN 裸露焊盤(pán)
供應(yīng)商設(shè)備封裝： 22-DFN（6x3）裸露焊盤(pán)
包裝： 帶卷 (TR)
LTC6605-7
17
66057f
Figure 8. Driving an ADC
66057 F08
3.3V
0.1μF
2.2μF
1μF
BIAS
τ = R (C1 + 2 C2)
CONTROL
ADC
3V
D15
D0
VOCM
VIN
–
+
21
19
AIN
+
AIN
–
VCM
GND
22
18
10nF
2
3
4
1
5
20
C1
C2
10Ω
R
C1
+
–
1/2 LTC6605-7
CHANNEL A
APPLICATIONS INFORMATION
the sampling transient of the ADC (see Figure 8). The
capacitance serves to provide the bulk of the charge
during the sampling process, while the two resistors at
the outputs of the LTC6605-7 are used to dampen and
attenuate any charge injected by the ADC. The RC lter
gives the additional benet of band limiting broadband
output noise. The selection of the RC time constant is trial
and error for a given ADC, but the following guidelines are
recommended. Choose an RC time constant that is smaller
than the reciprocal of the lter cutoff frequency congured
by the LTC6605-7. Time constants on the order of 2ns
do a good job of ltering broadband noise. Longer time
constants improve SNR at the expense of settling time.
The resistors in the decoupling network should be at least
25Ω. Too large of a resistor will leave insufcient settling
time. Too small of a resistor will not properly dampen the
load transient of the sampling process, prolonging the
time required for settling. In 16-bit applications, this will
typically require a minimum of eleven RC time constants.
The 10Ω resistors at the inputs to the ADC minimize the
sampling transients that charge the RC lter capacitors.
For lowest distortion, choose capacitors with low dielectric
absorption, such as a C0G multilayer ceramic capacitor.
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