For example, for an LTC1264 bandpass filter with fCENTER
參數(shù)資料
型號(hào)： LTC1264CN
廠商： Linear Technology
文件頁(yè)數(shù)： 3/16頁(yè)
文件大小： 0K
描述： IC FILTR BUILDNG BLK HISPD 24DIP
標(biāo)準(zhǔn)包裝： 15
濾波器類型： 通用開關(guān)電容器
頻率 - 截止或中心： 250kHz
濾波器數(shù)： 4
濾波器階數(shù)： 2nd
電源電壓： ±2.37 V ~ 8 V
安裝類型： 通孔
封裝/外殼： 24-DIP（0.300"，7.62mm）
供應(yīng)商設(shè)備封裝： 24-PDIP
包裝： 管件
11
LTC1264
1264fb
U
S
A
O
PPLICATI
WU
U
I FOR ATIO
For example, for an LTC1264 bandpass filter with fCENTER
= 100kHz and fCLK = 2MHz, a 3.9MHz, 10mV input will
produce a 100kHz, 10mV output. A 1st or 2nd order
prefilter will reduce aliasing to acceptable levels in most
cases.
A GUIDE TO BANDPASS DESIGN
Filter design tools like FCAD require design specification
inputs such as passband ripple, attenuation, passband
width and stopband width in order to calculate filter
parameters fO, Q, fn or poles and zeroes. The results of
these filter approximations most often require Q values
which make excessive demands on the gain-bandwidth
products of active filter realizations. The active filter de-
signer should define a gain response so that the filter’s
mathematical approximation has practical requirements.
Table 4 is a guide to practical design specifications for
realizing bandpass filters with LTC1264 (please also refer
to the Typical Maximum Q vs Clock Frequency and Band-
pass Gain Error graphs under Typical Performance Char-
acteristics).
A Bandpass Design Example
Filter Type:
Bandpass
Filter Response:
Butterworth
Passband Ripple:
3dB
Attenuation:
60dB
Center Frequency:
40kHz (fCENTER)
Passband Width:
10kHz
Stopband Width:
60kHz
Implementing the Bandpass Design
With the LTC1264 in Mode 1b, Butterworth and Chebyshev
bandpass designs with fCLK to fCENTER ratios greater than
20:1 are possible.
First choose the clock frequency which in Mode 1b must
be greater than 20 times the bandpass center frequency of
40kHz. For this example, let’s choose fCLK to be 1MHz.
Table 6 lists the resistors for for the bandpass design
example and Figure 11 shows the complete circuit.
Table 4. Bandpass Design Specifications (fCENTER is center
frequency of passband.)
PASSBAND
STOPBAND
ATTENU-
RIPPLE
WIDTH
ATION
(dB)
(Hz)
(dB)
≤ 3dB for Butterworth
≥ fCENTER/20
≥ 5 × Passband –40 to –60
≤0.1 for Chebyshev
≥ fCENTER/20
≥ 5 × Passband –40 to –60
Note: Reducing passband ripple or attenuation will decrease Q values. The
filter order may also increase.
Table 5. Calculated Filter Parameters
STAGE
fO
Q
1
38.1201kHz
4.3346
2
41.9726kHz
4.3346
3
35.6418kHz
10.5221
4
44.8911kHz
10.5221
Table 6. Calculated Mode 1b Resistors to Nearest 1% Value
Using Table 5 Filter Parameters and Figure 10 Equations
STAGE
R1
R2
R3
R5
R6
1
52.3k
10k
56.2k
5k
6.98k
2
47.5k
10k
51.1k
5k
11.8k
3
56.2k
10k
147k
5k
5.11k
4
44.2k
10k
118k
5k
20.5k
Figure 10. Equations for Resistors in Mode 1b Operation
R2 = 10k
R5 = 5k
fi =
R1 =
(FOR BANDPASS)
R6 =
HOBP =
+ 1
R3 =
R3
HOBP
R5fO
2
fi
2
– fO
2
()
√ ()
Q
2
fO
fCENTER
–
fCENTER
fO
() 2
R2Q
R6
R6 + 5
()
√
1264 F10
fCLK
20
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