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LTC1569-6_1 PDF预览

LTC1569-6_1

更新时间: 2024-10-28 05:43:39
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
12页 192K
描述
Linear Phase, DC Accurate, Low Power, 10th Order Lowpass Filter

LTC1569-6_1 数据手册

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LTC1569-6  
Linear Phase, DC Accurate,  
Low Power, 10th Order Lowpass Filter  
tems. Furthermore, its root raised cosine response offers  
the optimum pulse shaping for PAM data communica-  
tions. The filter attenuation is 50dB at 1.5 • fCUTOFF, 60dB  
at 2 • fCUTOFF, and in excess of 80dB at 6 • fCUTOFF. DC-  
accuracy-sensitive applications benefit from the 5mV  
maximum DC offset.  
FEATURES  
One External R Sets Cutoff Frequency  
Root Raised Cosine Response  
3mA Supply Current with a Single 3V Supply  
Up to 64kHz Cutoff on a Single 3V Supply  
10th Order, Linear Phase Filter in an SO-8  
The LTC1569-6 sampled data filter does not require an  
external clock yet its cutoff frequency can be set with a  
single external resistor with a typical accuracy of 3.5% or  
better. The external resistor programs an internal oscilla-  
tor whose frequency is divided by either 1, 4 or 16 prior to  
being applied to the filter network. Pin 5 determines the  
divider setting. Thus, up to three cutoff frequencies can be  
obtained for each external resistor value. Using various  
resistor values and divider settings, the cutoff frequency  
can be programmed over a range of six octaves. Alterna-  
tively, the cutoff frequency can be set with an external  
clock and the clock-to-cutoff frequency ratio is 64:1. The  
ratio of the internal sampling rate to the filter cutoff  
frequency is 128:1.  
DC Accurate, VOS(MAX) = 5mV  
Low Power Modes  
Differential or Single-Ended Inputs  
80dB CMRR (DC)  
82dB Signal-to-Noise Ratio, VS = 5V  
Operates from 3V to ±5V Supplies  
U
APPLICATIO S  
Data Communication Filters for 3V Operation  
Linear Phase and Phase Matched Filters for I/Q  
Signal Processing  
Pin Programmable U Cutoff Frequency Lowpass Filters  
DESCRIPTIO  
The LTC1569-6 is fully tested for a cutoff frequency of  
64kHz with a single 3V supply.  
The LTC®1569-6 is a 10th order lowpass filter featuring  
linear phase and a root raised cosine amplitude response.  
The high selectivity of the LTC1569-6 combined with its  
linear phase in the passband makes it suitable for filtering  
both in data communications and data acquisition sys-  
The LTC1569-6 features power saving modes and it is  
available in an SO-8 surface mount package.  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
U
TYPICAL APPLICATIO  
Frequency Response, fCUTOFF = 64kHz/16kHz/4kHz  
0
Single 3V Supply, 64kHz/16kHz/4kHz Lowpass Filter  
–20  
–40  
1
2
8
7
+
V
IN  
IN  
OUT  
V
OUT  
IN  
R
EXT  
= 10k  
1/4  
3V  
+
3V  
1µF  
V
LTC1569-6  
GND  
3.48k  
2k  
3
4
6
5
R
X
–60  
3V  
1µF  
1/16  
1/1  
V
DIV/CLK  
–80  
100pF  
EASY TO SET f  
:
CUTOFF  
–100  
64kHz (10k/R  
)
EXT  
1
10  
100  
1000  
f
=
CUTOFF  
1569-6 TA01  
1, 4 OR 16  
FREQUENCY (kHz)  
1569-6 TA01a  
1

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