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PDF LTC1069-7I Data sheet ( Hoja de datos )
| Número de pieza | LTC1069-7I | |
| Descripción | Linear Phase 8th Order Lowpass Filter | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC1069-7
Linear Phase
8th Order Lowpass Filter
FEATURES
s 8th Order, Linear Phase Filter in SO-8 Package
s Raised Cosine Amplitude Response
s – 43dB Attenuation at 2× fCUTOFF
s Wideband Noise: 140µVRMS
s Operates from Single 5V Supply to
±5V Power Supplies
s Clock-Tunable to 200kHz with ±5V Supplies
s Clock-Tunable to 120kHz with Single 5V Supply
U
APPLICATIONS
s Digital Communication Filter
s Antialiasing Filter with Linear Phase
s Smoothing Filters
DESCRIPTION
The LTC®1069-7 is a monolithic, clock-tunable, linear
phase, 8th order lowpass filter. The amplitude response
of the filter approximates a raised cosine filter with an
alpha of one. The gain at the cutoff frequency is – 3dB and
the attenuation at twice the cutoff frequency is 43dB. The
cutoff frequency of the LTC1069-7 is set by an external
clock and is equal to the clock frequency divided by 25.
The ratio of the internal sampling frequency to the cutoff
frequency is 50:1 that is, the input signal is sampled twice
per clock cycle to lower the risk of aliasing. The LTC1069-
7 can be operated from a single 5V supply up to dual ±5V
supplies.
The gain and phase response of the LTC1069-7 can be
used in digital communication systems where pulse shap-
ing and channel bandwidth limiting must be carried out.
Any system that requires an analog filter with linear phase
and sharper roll off than conventional Bessel filters can
use the LTC1069-7.
The LTC1069-7 has a wide dynamic range. With ±5V
supplies and an input range of 0.1VRMS to 2VRMS, the
signal-to-(noise + THD) ratio is ≥ 60dB. The wideband
noise of the LTC1069-7 is 140µVRMS. Unlike other
LTC1069-X filters, the typical passband gain of the
LTC1069-7 is equal to –1V/V.
The LTC1069-7 is available in an SO-8 package.
Other filter responses with lower power/speed specifica-
tions can be obtained. Please contact LTC Marketing.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
Single 5V Supply, Linear Phase 100kHz Lowpass Filter
0.47µF
5V
0.1µF
AGND
VOUT
V+ V–
LTC1069-7
NC NC
VIN VIN
CLK
VOUT
fCLK = 2.5MHz
1069-7 TA01
10
0
–10
– 20
– 30
– 40
– 50
– 60
– 70
10
Frequency Response
100
FREQUENCY (kHz)
1000
1069-7 TA02
1
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS
Phase Matching vs Frequency
2.50
2.25 70°C
2.00
1.75
25°C
1.50
1.25
1.00
0.75 VS = ±5V
fCLK ≤ 2.5MHz
0.50 PHASE DIFFERENCE BETWEEN
ANY TWO UNITS (SAMPLE OF
0.25 20 REPRESENTATIVE UNITS)
0
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
FREQUENCY (fCUTOFF/FREQUENCY)
LTC1069-7 • TPC11
THD + Noise vs Input (VP-P)
–40
fCLK = 1MHz
–45 fC = 40kHz
fIN = 1kHz
–50
–55 VS = 5V
–60
–65
–70 VS = ±5V
–75
0.1
1
INPUT (VP-P)
10
LTC1609-7 • TPC13
Transient Response
VS = ±5V
0.1ms/DIV
fCLK = 500kHz
fCUTOFF = 20kHz
VIN = 4VP-P SQUARE WAVE AT 1kHz
LTC1069-7 • TPC15
Output Voltage Swing vs
Temperature
4.2
4.1
4.0 VS = ±5V
fCLK = 2.5MHz
fCUTOFF = 100kHz
–4.5
RL = 10k
ISOURCE/ISINK = 1mA
–4.6
–4.7
–40 –20
0 20 40 60 80 100
TEMPERATURE (°C)
LTC1069-7 • TPC18
Output Offset vs Clock Frequency
– 10
–15
–20
VS = 5V
–25
–30
–35 VS = ±5V
–40
–45
–50
0.25
1.25 2.25 3.25 4.25 5.25
CLOCK FREQUENCY (MHz)
LTC1069-7 • TPC16
Supply Current vs
Supply Voltage
25 fCLK = 10Hz
20
25°C 85°C
15 –40°C
10
5
0
01 2 3 4 5 6
SUPPLY VOLTAGE (±V)
LTC1069-7 • TPC19
LTC1069-7
THD + Noise vs Frequency
–40
fCLK = 2.5MHz
–45 fC = 100kHz
–50
–55
–60 VS = 5V, VIN = 1VP-P
–65
–70
–75
–80
1
VS = ±5V, VIN = 2VP-P
10
FREQUENCY (kHz)
100
LTC1069-7 • TPC14
Output Voltage Swing vs
Temperature
4.3
4.2
4.1 VS = 5V (AGND AT 2.5V)
fCLK = 500kHz
fCUTOFF = 20kHz
1.2
RL = 10k
ISOURCE/ISINK ≤ 1mA
1.1
1.0
–40 –20
0 20 40 60 80 100
TEMPERATURE (°C)
LTC1069-7 • TPC17
Supply Current vs
Clock Frequency
22
21
20
19
18
17
16
15
14
13
12
11
10
0.25
VS = ±5V
VS = 5V
1.25 2.25 3.25 4.25
CLOCK FREQUENCY (MHz)
5.25
LTC1263 • TPC20
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet LTC1069-7I.PDF ] | |
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