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LTC1569IS8-7 Datasheet

  • LTC1569IS8-7

  • Linear Phase, DC Accurate, Tunable, 10th Order Lowpass Filte...

  • 226.37KB

  • 12頁

  • LINER

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LTC1569-7
Linear Phase, DC Accurate,
Tunable, 10th Order Lowpass Filter
FEATURES
s
s
s
s
s
s
s
s
s
s
s
One External R Sets Cutoff Frequency
Root Raised Cosine Response
Up to 300kHz Cutoff on a Single 5V Supply
Up to 150kHz Cutoff on a Single 3V Supply
10th Order, Linear Phase Filter in an SO-8
DC Accurate, V
OS(MAX)
= 5mV
Low Power Modes
Differential or Single-Ended Inputs
80dB CMRR (DC)
80dB Signal-to-Noise Ratio, V
S
= 5V
Operates from 3V to
鹵5V
Supplies
Furthermore, its root raised cosine response offers the
optimum pulse shaping for PAM data communications.
The filter attenuation is 50dB at 1.5 鈥?f
CUTOFF
, 60dB at 2 鈥?/div>
f
CUTOFF
, and in excess of 80dB at 6 鈥?f
CUTOFF
. DC-accuracy-
sensitive applications benefit from the 5mV maximum DC
offset.
The LTC1569-7 is the first sampled data filter which 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 oscillator 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
seven octaves. Alternatively, the cutoff frequency can be
set with an external clock and the clock-to-cutoff fre-
quency ratio is 32:1. The ratio of the internal sampling rate
to the filter cutoff frequency is 64:1.
The LTC1569-7 is fully tested for a cutoff frequency of
256kHz/128kHz with single 5V/3V supply although up to
300kHz cutoff frequencies can be obtained.
The LTC1569-7 features power savings modes and it is
available in an SO-8 surface mount package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s
s
s
Data Communication Filters for 3V Operation
Linear Phase and Phase Matched Filters for I/Q
Signal Processing
Pin Programmable Cutoff Frequency Lowpass Filters
DESCRIPTIO
廬
The LTC 1569-7 is a 10th order lowpass filter featuring
linear phase and a root raised cosine amplitude response.
The high selectivity of the LTC1569-7 combined with its
linear phase in the passband makes it suitable for filtering
both in data communications and data acquisition sytems.
TYPICAL APPLICATION
Frequency Response, f
CUTOFF
= 128kHz/32kHz/8kHz
Single 3V Supply, 128kHz/32kHz/8kHz Lowpass Filter
V
IN
3V
3.48k
3
2k
1碌F
4
V
鈥?/div>
DIV/CLK
5
1/1
1
IN
+
IN
鈥?/div>
OUT
V
+
8
V
OUT
R
EXT
= 10k
1碌F
6
1/16
1/4
鈥?0
0
2
7
LTC1569-7
GND
R
X
GAIN (dB)
EASY TO SET f
CUTOFF
:
f
CUTOFF
=
1, 4 OR 16
128kHz (10k/R
EXT
)
1569-7 TA01
U
U
U
鈥?0
3V
鈥?0
鈥?0
3V
100pF
鈥?00
1
10
100
FREQUENCY (kHz)
1000
1569-7 TA01a
1

LTC1569IS8-7 產(chǎn)品屬性

  • LTC1569-7

  • 100

  • 集成電路 (IC)

  • 接口 - 濾波器 - 有源

  • -

  • 線性相位，低通開關(guān)電容器

  • 300kHz

  • 1

  • 10th

  • -

  • 表面貼裝

  • 8-SOIC（0.154"，3.90mm 寬）

  • 8-SOIC

  • 管件

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