LTC1569I Linear Technology, LTC1569I Datasheet

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LTC1569I

Manufacturer Part Number
LTC1569I
Description
Linear Phase/ DC Accurate/ Tunable/ 10th Order Lowpass Filter
Manufacturer
Linear Technology
Datasheet

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FEATURES
DESCRIPTIO
APPLICATIO S
The LTC
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
Data Communication Filters for 3V Operation
Linear Phase and Phase Matched Filters for I/Q
Signal Processing
Pin Programmable Cutoff Frequency Lowpass Filters
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
Low Power Modes
Differential or Single-Ended Inputs
80dB CMRR (DC)
80dB Signal-to-Noise Ratio, V
Operates from 3V to 5V Supplies
Single 3V Supply, 128kHz/32kHz/8kHz Lowpass Filter
3V
3.48k
2k
®
1569-7 is a 10th order lowpass filter featuring
APPLICATION
1 F
V
IN
EASY TO SET f
f
OS(MAX)
CUTOFF
1
2
3
4
U
U
IN
IN
GND
V
LTC1569-7
+
=
128kHz (10k/R
DIV/CLK
= 5mV
1, 4 OR 16
CUTOFF
OUT
V
R
+
X
:
8
7
6
5
S
EXT
U
V
1/16
R
= 5V
OUT
1/1
)
EXT
= 10k
1/4
1569-7 TA01
1 F
100pF
3V
3V
Tunable, 10th Order Lowpass Filter
Furthermore, its root raised cosine response offers the
optimum pulse shaping for PAM data communications .
The filter attenuation is 50dB at 1.5 • f
f
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.
CUTOFF
, LTC and LT are registered trademarks of Linear Technology Corporation.
Linear Phase, DC Accurate,
Frequency Response, f
, and in excess of 80dB at 6 • f
–100
–20
–40
–60
–80
0
1
10
FREQUENCY (kHz)
CUTOFF
= 128kHz/32kHz/8kHz
100
CUTOFF
LTC1569-7
CUTOFF
1569-7 TA01a
. DC-accuracy-
1000
, 60dB at 2 •
1

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LTC1569I Summary of contents

Page 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. Frequency Response, f OUT R = 10k ...

Page 2

... XI U (Note 1) Total Supply Voltage ................................................ 11V Power Dissipation .............................................. 500mW Operating Temperature LTC1569C ............................................... LTC1569I ............................................ – Storage Temperature ............................ – 150 C Lead Temperature (Soldering, 10 sec).................. 300 C ELECTRICAL C HARA TERISTICS C The denotes the specifications which apply over the full operating temperature range, otherwise specifications are – ...

Page 3

ELECTRICAL C HARA TERISTICS C The denotes the specifications which apply over the full operating temperature range, otherwise specifications are – 3V 0V 4.096MHz CLK PARAMETER ...

Page 4

LTC1569 TYPICAL PERFOR A CE CHARACTERISTICS Gain vs Frequency 10 – 100 FREQUENCY (kHz) THD vs Input Frequency –68 – PIN –72 – 1.5V IN P-P f ...

Page 5

PIN FUNCTIONS + – IN /IN (Pins 1, 2): Signals can be applied to either or both input pins. The DC gain from IN (Pin 8) is 1.0, and the DC gain from Pin 2 to Pin ...

Page 6

LTC1569 APPLICATIONS INFORMATION Self-Clocking Operation The LTC1569-7 features a unique internal oscillator which sets the filter cutoff frequency using a single external resistor . The design is optimized for V 128kHz, where the filter cutoff frequency error is ...

Page 7

U U APPLICATIONS INFORMATION 1.010 1.008 1.006 V = 10V S 1.004 1.002 1.000 0.998 0.996 0.994 0.992 0.990 –50 – TEMPERATURE ( C) Figure 5. Filter Cutoff vs Temperature, ...

Page 8

LTC1569 APPLICATIONS INFORMATION The oscillator is sensitive to transients on the positive supply. The IC should be soldered to the PC board and the PCB layout should include ceramic capacitor be- + – tween V ...

Page 9

U U APPLICATIONS INFORMATION Table 2. Wideband Noise vs Supply Voltage, Single 3V Supply Bandwidth Total Integrated Noise CUTOFF • f CUTOFF CLK Table 3. Wideband Noise vs Supply Voltage, f ...

Page 10

LTC1569 APPLICATIONS INFORMATION every clock period. Therefore, the sampling frequency is twice the clock frequency and 64 times the filter cutoff frequency. Input signals with frequencies near 2 • will be aliased to the passband of ...

Page 11

... FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE 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. ...

Page 12

... TA08 = 75/1 or 150/1, Very Low Noise = 50/1 or 100/ 100kHz CUTOFF(MAX) = 25/1, 50/1, 100/1 or 200/ 200kHz CUTOFF(MAX) = 25/ 200kHz, SO-8 CUTOFF(MAX) = 50/1 or 100/ 2.5mA 25/1 or 50/ 200kHz CUTOFF(MAX) = 150kHz (LTC1562) = 300kHz (LTC1562-2) 15697f LT/TP 0300 4K • PRINTED IN THE USA LINEAR TECHNOLOGY CORPORATION 1998 = 8.56k + 1569-7 TA10 ...

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