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參數(shù)資料
| 型號(hào)： | LTC1061AM |
| 廠商： | Linear Technology Corporation |
| 英文描述： | High Performance Triple Universal Filter Building Block |
| 中文描述： | 三高性能通用濾波器積木 |
| 文件頁(yè)數(shù)： | 14/16頁(yè) |
| 文件大?。?/td> | 352K |
| 代理商： | LTC1061AM |
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LTC1061
ODES OF OPERATIO
W
U
Description and Applications
1. Primary Modes: There are two basic modes of opera-
tion, Mode 1 and Mode 3. In Mode 1, the ratio of the
external clock frequency to the center frequency of each
2nd order section is internally fixed at 50:1 or 100:1. In
Mode 3, this ratio can be adjusted above or below 50:1 or
100:1. The side C of the LTC1061 can be connected only
in Mode 3. Figure 3 illustrates Mode 1 providing 2nd order
notch, lowpass, and bandpass outputs (for definition of
filter functions, refer to the LTC1060 data sheet). Mode 1
can be used to make high order Butterworth lowpass
filters; it can also be used to make low Q notches and for
cascading 2nd order bandpass functions tuned at the
same center frequency and with unity-gain. Mode 3,
Figure 4, is the classical state variable configuration pro-
viding highpass, bandpass and lowpass 2nd order filter
functions.
Since the input amplifier is within the resonant loop, its
phase shift affects the high frequency operation of the
filter and therefore, Mode 3 is slower than Mode 1. Mode
3 can be used to make high order all-pole bandpass,
lowpass, highpass and notch filters. Mode 3 as well as
Mode 1 is a straightforward mode to use and the filter’s
dynamics can easily be optimized. Figure 5 illustrates a 6th
order lowpass Butterworth filter operating with up to
40kHz cutoff frequency and with up to 200kHz input
frequency. Sides A, B are connected in Mode 1 while side
C is connected in Mode 3. The lower Q section was placed
in side C, Mode 3, to eliminate any early Q enhancement.
This could happen when the clock approaches 2MHz. The
measured frequency response is shown in Figure 6. The
attenuation floor is limited by the crosstalk between the
three different sections operating with a clock frequency
above 1MHz. The measured wideband noise was
150
VRMS. For limited temperature range the filter of
Figure 5 works up to 2.5MHz clock frequency thus yielding
a 50kHz cutoff.
Figure 4. Mode 3: 2nd Order Filter Providing Highpass,
Bandpass, Lowpass
Figure 3. Mode 1: 2nd Order Filter Providing Notch,
Bandpass, Lowpass
20
19
18
17
16
15
14
13
12
11
1
2
3
4
5
6
7
8
9
10
R32
VOUT
R13
VIN
LTC1061 F05
LTC1061
R22
R12
R31
R21
R41
R33
R23
T2L CLOCK
< 2.5MHz
V –
R11
V +
HARMONIC DISTORTION WITH fCLK = 2MHz
fIN
2ND HARMONIC
10kHz, 1VRMS
20kHz, 1VRMS
30kHz, 1VRMS
40kHz, 1VRMS
–74dB
–62dB
STANDARD 1%
RESISTOR VALUES
R11 = 20k
R31 = 11k
R12 = 20k
R32 = 14k
R13 = 10k
R21 = 20k
R41 = 20k
R22 = 20k
R23 = 10k
R33 = 17.8k
Figure 5. 6th Order Butterworth Lowpass Filter with
Cutoff Frequency up to 45kHz
–
+
Σ
∫
AGND
R1
N
BP
LP
VIN
1061 F03
+
–
S
1/3 LTC1061
R2
R3
fO =
; fn = fO
HOLP = –
; HOBP = –
; HON1 = –
Q =
fCLK
100(50)
R2
R1
R3
R1
R2
R1
R3
R2
–
+
Σ
∫
AGND
R1
HP
BP
LP
VIN
1061 F04
+
–
S
1/3 LTC1061
R2
R3
R4
fO =
; Q =
HOHP = –
; HOBP = –
; HOLP = –
fCLK
100(50)
R2
R1
R3
R1
R4
R1
R3
R2
√R2
R4
√R2
R4
CC
NOTE: ADD CC FOR Q > 5 AND fCLK > 1MHz, SUCH AS CC
0.16
R4
× 1.2MHz
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1061AMJ | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Performance Triple Universal Filter Building Block |
| LTC1061C | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Performance Triple Universal Filter Building Block |
| LTC1061CJ | 制造商:Linear Technology 功能描述:Active Filter Triple SW-CAP UNIV 6th Order 35kHz 20-Pin CDIP |
| LTC1061CN | 功能描述:IC FILTER BUILDNG BLK TRPL 20DIP RoHS:否 類別:集成電路 (IC) >> 接口 - 濾波器 - 有源 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1,000 系列:- 濾波器類型:連續(xù)時(shí)間，帶通低通 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:4.74 V ~ 11 V，±2.37 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:28-SOIC W 包裝:帶卷 (TR) |
| LTC1061CN#PBF | 功能描述:IC FILTER BUILDNG BLK TRPL 20DIP RoHS:是 類別:集成電路 (IC) >> 接口 - 濾波器 - 有源 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1,000 系列:- 濾波器類型:連續(xù)時(shí)間，帶通低通 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:4.74 V ~ 11 V，±2.37 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:28-SOIC W 包裝:帶卷 (TR) |
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