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LTC1068IN-PBF

更新时间： 2024-11-23 12:19:15
品牌 Logo 应用领域
凌特 - Linear 时钟
页数 文件大小 规格书
30页 388K
描述
Clock-Tunable, Quad Second Order, Filter Building Blocks

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LTC1068IN-PBF 数据手册

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LTC1068 Series  
Clock-Tunable, Quad  
Second Order, Filter Building Blocks  
FEATURES  
DESCRIPTION  
The LTC®1068 product family consists of four monolithic  
clock-tunablefilterbuildingblocks.Eachproductcontains  
fourmatched,lownoise,highaccuracy2ndorderswitched-  
capacitorfiltersections. Anexternalclocktunesthecenter  
frequency of each 2nd order filter section. The LTC1068  
products differ only in their clock-to-center frequency  
ratio. The clock-to-center frequency ratio is set to 200:1  
(LTC1068-200), 100:1 (LTC1068), 50:1 (LTC1068-50) or  
25:1(LTC1068-25).Externalresistorscanmodifytheclock-  
to-center frequency ratio. High performance, quad 2nd  
order, dual 4th order or 8th order filters can be designed  
with an LTC1068 family product. Designing filters with an  
LTC1068 product is fully supported by FilterCAD™ filter  
design software for Windows.  
n
Four Identical 2nd Order Filter Sections in an  
SSOP Package  
2nd Order Section Center Frequency Error:  
0.3% Typical and 0.ꢀ% ꢁaꢂiꢃuꢃ  
Low Noise per 2nd Order Section, Q ≤ 5:  
n
n
LTC106ꢀ-200 50µV  
LTC106ꢀ-50 75µV  
, LTC106ꢀ 50µV  
RꢁS  
RꢁS  
, LTC106ꢀ-25 90µV  
Low Power SuppRlyꢁCSurrent: 4.5mA, SinRgꢁleS5V,  
LTC1068-50  
n
n
Operation with 5V Power Supply, Single 5V  
Supply or Single 3.3V Supply  
APPLICATIONS  
n
Lowpass or Highpass Filters:  
LTC1068-200, 0.5Hz to 25kHz; LTC1068, 1Hz to  
50kHz; LTC1068-50, 2Hz to 50kHz; LTC1068-25,  
4Hz to 200kHz  
The LTC1068 products are available in a 28-pin SSOP  
surface mount package. A customized version of an  
LTC1068 family product can be obtained in a 16-lead SO  
package with internal thin-film resistors. Please contact  
LTC Marketing for details.  
n
Bandpass or Bandreject (Notch) Filters:  
LTC1068-200, 0.5Hz to 15kHz; LTC1068, 1Hz to  
30kHz; LTC1068-50, 2Hz to 30kHz; LTC1068-25,  
4Hz to 140kHz  
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and  
FilterCAD is a trademark of Linear Technology Corporation. All other trademarks are the property  
of their respective owners.  
TYPICAL APPLICATION  
Dual, ꢁatched, 4th Order Butterworth Lowpass Filters, Clock-Tunable Up  
to 200kHz f – 3dB = fCLK/25, 4th Order Filter Noise = 60µVRꢁS  
R12 14k  
R11 20k  
Gain vs Frequency  
1
2
28  
27  
26  
25  
24  
23  
22  
21  
20  
19  
18  
17  
16  
15  
V
INV B  
HPB/NB  
BPB  
INV C  
HPC/NC  
BPC  
IN1  
R21 14k  
R31 20k  
R22 20k  
R32 10k  
10  
0
3
4
–10  
–20  
–30  
–40  
–50  
–60  
–70  
–80  
V
LPB  
LPC  
OUT1  
5
SB  
SC  
LTC1068-25  
6
–
–5V  
NC  
V
1µF  
7
AGND  
NC  
CLK  
8
+
5V  
f
= (25)(f – 3dB)  
CLK  
V
0.1µF  
9
NC  
NC  
10  
11  
12  
13  
14  
SA  
SD  
0.1  
1
10  
V
LPA  
LPD  
OUT2  
R33 20k  
R23 14k  
R34 10k  
R24 20k  
RELATIVE FREQUENCY [f /(f – 3dB)]  
IN  
BPA  
HPA/NA  
INVA  
BPD  
1068 TA02  
HPD/ND  
INVD  
R13 20k  
V
IN2  
R14 14k  
1068 TA01  
1068fc  
1
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