TYPICAL APPLICATIONS U (Basic) 8th Order Lowpass Filters Ampli" />
參數(shù)資料
型號(hào): LTC1562AIG#TR
廠商: Linear Technology
文件頁數(shù): 7/28頁
文件大?。?/td> 0K
描述: IC FILTER UNIV RC QUAD LN 20SSOP
標(biāo)準(zhǔn)包裝: 1,800
濾波器類型: 通用連續(xù)計(jì)時(shí)
頻率 - 截止或中心: 150kHz
濾波器數(shù): 4
濾波器階數(shù): 8th
電源電壓: 4.75 V ~ 10.5 V,±4.75 V ~ 5.25 V
安裝類型: 表面貼裝
封裝/外殼: 20-SSOP(0.209",5.30mm 寬)
供應(yīng)商設(shè)備封裝: 20-SSOP
包裝: 帶卷 (TR)
15
LTC1562
1562fa
TYPICAL APPLICATIONS
U
(Basic)
8th Order Lowpass Filters
Amplitude Response
R21 = RIN1 = 10k
Quick Design Formulas for Some Popular Response Types:
2
100kHz
C
Butterworth
(Maximally Flat Passband)
for fC 10kHz to 140kHz
R21 = 7.51k
, RIN1 = 2.2R21*
, RIN4 =
2
100kHz
C
Chebyshev
(Equiripple Passband)
for fC 20kHz to 120kHz
Bessel
(Good Transient Response)
for fC 10kHz to 70kHz
RQ1 = 6.01k
100kHz
C
RQ1 = 119.3k
100kHz
C
100kHz
C + 560kHz
100kHz
C + 530kHz
R24*
2.2
100kHz
C + 2440kHz
R22 = RIN2 = 10k
2
100kHz
C
R22 = RIN2 = 14.99k
2
100kHz
C
RQ2 = 9k
Notes: fC is the cutoff frequency: For Butterworth and Bessel, response is 3dB down at fC. For Chebyshev filters with
±0.1dB passband ripple up to 0.95 fC, use LTC1562 “A” grade. *The resistor values marked with an asterisk (*) in the
Chebyshev formulas (R21 and R24) should be rounded to the nearest standard finite-tolerance value
before computing
the values dependent on them (RIN1 and RIN4 respectively).
Example: Chebyshev response, fC = 100kHz. The formulas above give R21 = 7.51k, nearest standard 1% value 7.50k.
Using this 1% value gives RIN1 = 16.5k, already a standard 1% value. RQ1 = 18.075k, nearest 1% value 18.2k.
R22 = RIN2 = 14.99k, nearest 1% value 15k. RQ2 = 11.02k, nearest 1% value 11k. R23 = RIN3 = 7.15k, already a
standard 1% value. RQ3 = 18.75k, nearest 1% value 18.7k. R24 = 26.7k, already a standard 1% value. This gives
RIN4 = 12.14k, nearest 1% value 12.1k. RQ4 = 8.75k, nearest 1% value 8.66k.
100kHz
C
RQ2 = 279.9k
100kHz
C
R23 = RIN3 = 10k
2
100kHz
C
R23 = RIN3 = 7.15k
2
100kHz
C
RQ3 = 5.1k
100kHz
C
RQ3 = 118.1k
100kHz
C
R24 = RIN4 = 10k
2
100kHz
C
R24 = 26.7k
2
100kHz
C
RQ4 = 25.63k
100kHz
C
R21 = RIN1 = 2.61k
2
100kHz
C
RQ1 = 3.63k
100kHz
C
R22 = RIN2 = 2.07k
2
100kHz
C
RQ2 = 5.58k
100kHz
C
R23 = RIN3 = 2.96k
2
100kHz
C
RQ3 = 3.05k
100kHz
C
R24 = RIN4 = 3.14k
2
100kHz
C
RQ4 = 2.84k
100kHz
C
RQ4 = 8.75k
100kHz
C
1562 TA04 TABLE
1
2
3
5
6
8
9
10
20
19
18
16
15
13
12
11
INV B
V1 B
V2 B
V+
SHDN
V2 A
V1 A
INV A
INV C
V1 C
V2 C
V
AGND
V2 D
V1 D
INV D
LTC1562
RIN2
RIN4
RIN1
VIN
VOUT
1562 TA04a
RIN3
–5V
5V
RQ1
R21
R23
0.1
F
0.1
F
RQ3
R24
RQ4
RQ2
R22
SCHEMATIC INCLUDES PIN NUMBERS FOR 20-PIN PACKAGE.
PINS 4, 7, 14, 17 (NOT SHOWN) ALSO CONNECT TO V
FREQUENCY (Hz)
GAIN
(dB)
10
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
10k
100k
500k
1562 TA04b
CHEBYSHEV
fC = 100kHz
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