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參數資料
| 型號： | LTC1569IS8-7 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 運動控制電子 |
| 英文描述： | Linear Phase, DC Accurate, Tunable, 10th Order Lowpass Filter |
| 中文描述： | CONTINUOUS TIME FILTER, PIN OR RESISTOR PROGRAMMABLE, LOWPASS, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SO-8 |
| 文件頁數： | 1/12頁 |
| 文件大?。?/td> | 217K |
| 代理商： | LTC1569IS8-7 |
1
LTC1569-6
Linear Phase, DC Accurate,
Low Power, 10th Order Lowpass Filter
September 1999
Final Electrical Specifications
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
I
One External R Sets Cutoff Frequency
I
Root Raised Cosine Response
I
3mA Supply Current with a Single 3V Supply
I
Up to 64kHz Cutoff on a Single 3V Supply
I
10th Order, Linear Phase Filter in an SO-8
I
DC Accurate, V
OS(MAX)
= 5mV
I
Low Power Modes
I
Differential or Single-Ended Inputs
I
80dB CMRR (DC)
I
82dB Signal-to-Noise Ratio, V
S
= 5V
I
Operates from 3V to
±
5V Supplies
APPLICATIOU
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-
I
Data Communication Filters for 3V Operation
I
Linear Phase and Phase Matched Filters for I/Q
Signal Processing
I
Pin Programmable Cutoff Frequency Lowpass Filters
DESCRIPTIO
U
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 f
CUTOFF
, 60db
at 2 f
CUTOFF
, and in excess of 80dB at 6 f
CUTOFF
. DC-
accuracy-sensitive applications benefit from the 5mV
maximum DC offset.
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.
The LTC1569-6 is fully tested for a cutoff frequency of
64kHz with a single 3V supply.
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.
FREQUENCY (kHz)
1
G
0
–20
–40
–60
–80
–100
10
100
1000
1569-6
TA01a
1
8
2
7
3
6
4
5
1
μ
F
3V
1/4
1/16
1/1
3V
R
EXT
= 10k
100pF
1
μ
F
2k
3.48k
3V
LTC1569-6
EASY TO SET f
CUTOFF
:
f
CUTOFF
= 64kHz (10k/R
EXT
)
1, 4 OR 16
1569-6 TA01
IN
+
IN
–
GND
V
–
OUT
V
IN
V
OUT
V
+
R
X
DIV/CLK
Frequency Response, f
CUTOFF
= 64kHz/16kHz/4kHz
Single 3V Supply, 64kHz/16kHz/4kHz Lowpass Filter
FEATURES
TYPICAL APPLICATIO
U
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