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参数资料
| 型号： | LTC1060CSW#TR |
| 厂商： | Linear Technology |
| 文件页数： | 7/20页 |
| 文件大小： | 0K |
| 描述： | IC BUILDING BLK DUAL FLTR 20SOIC |
| 标准包装： | 1,000 |
| 滤波器类型： | 通用开关电容器 |
| 频率 - 截止或中心： | 30kHz |
| 滤波器数： | 2 |
| 滤波器阶数： | 4th |
| 电源电压： | ±2.37 V ~ 5 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： | 带卷 (TR) |
15
LTC1060
1060fb
COMM E TS ON THE M ODES OF OPERATIO
U
W
U
There are basically three modes of operation: mode 1,
mode 2, mode 3. In the mode 1 (Figure 4), the input
amplifier is outside the resonant loop. Because of this,
mode 1 and its derivatives (mode 1a, 1b, 1c) are faster
than modes 2 and 3. In mode 1, for instance, the Q errors
are becoming noticeable above 1MHz clock frequency.
Mode 1a (Figure 5), represents the most simple hook-up
of the LTC1060. Mode 1a is useful when voltage gain at the
bandpass output is required. The bandpass voltage gain,
however, is equal to the value of Q; if this is acceptable,
a second order, clock tunable, BP resonator can be achiev-
ed with only 2 resistors. The filter center frequency directly
depends on the external clock frequency. For high order
filters, mode 1a is not practical since it may require several
clock frequencies to tune the overall filter response.
Mode 1 (Figure 4), provides a clock tunable notch; the
depth is shown in Graph 14. Mode 1 is a practical
configuration for second order clock tunable bandpass/
notch filters. In mode 1, a bandpass output with a very
high Q, together with unity gain, can be obtained without
creating problems with the dynamics of the
remaining notch and lowpass outputs.
Modes 1b and 1c (Figures 6 and 7), are similar. They both
produce a notch with a frequency which is always equal to
the filter building block center frequency. The notch and
the center frequency, however, can be adjusted with an
external resistor ratio.
The practical clock-to-center frequency ratio range is:
≥≥
fCLK
f0
500
1
100
1
or
; mode 1b
50
1
≥≥
fCLK
fo
100
1
100
√2
or
; mode 1c
50
1
50
√2
The input impedance of the S1 pin is clock dependent,
and in general R5 should not be larger than 5k. Mode 1b
can be used to increase the clock-to-center frequency
ratio beyond 100:1. For this mode, a practical limit for the
(fCLK/f0) ratio is 500:1. Beyond this, the filter will exhibit
large output offsets. Mode 1c is the fastest mode of
operation: In the 50:1 mode and with (R5 = 0, R6 = ∞) the
clock-to-center frequency ratio becomes (50/√2) and cen-
ter frequencies beyond 20kHz can easily be achieved as
shown in Graph 25. Figure 19 illustrates how to cascade
the two sections of the LTC1060 connected in mode 1c to
obtain a sharp fourth order, 1dB ripple, BP Chebyshev
filter. Note that the center frequency to the BW ratio for this
fourth order bandpass filter is 20/1. By varying the clock
frequency to sweep the filter, the center frequency of the
overall filter will increase proportionally and so will the BW
to maintain the 20:1 ratio constant. All the modes of
operation yield constant Q’s; with any filter realization the
BW’s will vary when the filter is swept. This is shown in
Figure 19, where the BP filter is swept from 1kHz to 20kHz
center frequency.
Figure 17. Mode 6b: 1st Order Filter Providing Lowpass
Figure 18. Mode 7: 1st Order Filter Providing Allpass, Lowpass
1/2 LTC1060
SA/B
VIN
fC =; HOLP1 = 1 ; HOLP2 = –
fCLK R2
100(50) R3
TLC1060 MOO14
1
–
+
–
+
R3
R2
LP1
(18)
(20)
LP2
(19)
S1A
(16)
V –
(17)
R3
R2
15
4
3
5
2
Σ
6
∫∫
1/2 LTC1060
SA/B
VIN
fP =; fz =; GAIN AT AP OUTPUT = 1 FOR 0 ≤ f ≤
HOLP = 2 x
fCLK R2
100(50) R3
TLC1060 MOO15
1
–
+
–
+
R3
R2=R1
R1=R2
AP
(18)
(20)
LP
(19)
S1A
(16)
V –
(17)
fCLK R2
100(50) R3
fCLK
2
R3
R2
15
3
5
2
Σ
6
4
∫∫
ODES OF OPERATIO
UW
相关PDF资料 |
PDF描述 |
|---|---|
| LTC1060CSW#PBF | IC FILTER BUILDING BLOCK 20-SOIC |
| VE-2T3-IY-F3 | CONVERTER MOD DC/DC 24V 50W |
| VE-2T2-IY-F1 | CONVERTER MOD DC/DC 15V 50W |
| VE-2T1-IY-F3 | CONVERTER MOD DC/DC 12V 50W |
| LTC1067IS#TR | IC FILTR BLD BLK DUAL R-R 16SOIC |
相关代理商/技术参数 |
参数描述 |
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| LTC1060M | 制造商:LINER 制造商全称:Linear Technology 功能描述:Universal Dual Filter Building Block |
| LTC1060MJ | 制造商:LINER 制造商全称:Linear Technology 功能描述:Universal Dual Filter Building Block |
| LTC1060MJ/883 | 制造商:Linear Technology 功能描述:Active Filter Dual SW-CAP UNIV 4th Order 20kHz 20-Pin CDIP |
| LTC1060S | 制造商:LINER 制造商全称:Linear Technology 功能描述:Universal Dual Filter Building Block |
| LTC1061 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Performance Triple Universal Filter Building Block |
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