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参数资料
| 型号： | LTC1061CSW#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/16页 |
| 文件大小： | 0K |
| 描述： | IC FILTR BUILDNG BLK TRPL 20SOIC |
| 标准包装： | 38 |
| 滤波器类型： | 通用开关电容器 |
| 频率 - 截止或中心： | 35kHz |
| 滤波器数： | 3 |
| 滤波器阶数： | 6th |
| 电源电压： | 4.74 V ~ 16 V，±2.37 V ~ 8 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 20-SOIC |
| 包装： | 管件 |
7
LTC1061
1061fe
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
–
+
Σ
∫
AGND
R1
HP
BP
LP
VIN
1061 F04
+
–
S
1/3 LTC1061
R2
R3
R4
CC
NOTE: ADD CC FOR Q > 5 AND fCLK > 1MHz, SUCH AS CC
0.16
R4
× 1.2MHz
fO =
; Q =
HOHP = –
; HOBP = –
; HOLP = –
fCLK
100(50)
R2
R1
R3
R1
R4
R1
R3
R2
√R2
R4
√R2
R4
–
+
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
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
Figure 5. 6th Order Butterworth Lowpass Filter with
Cutoff Frequency up to 45kHz
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