ltc1565-31is8-trpbf Linear Technology Corporation, ltc1565-31is8-trpbf Datasheet

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ltc1565-31is8-trpbf

Manufacturer Part Number
ltc1565-31is8-trpbf
Description
650khz Continuous Time, Linear Phase Lowpass Filter
Manufacturer
Linear Technology Corporation
Datasheet
FEATURES
TYPICAL APPLICATIO
APPLICATIO S
7th Order, 650kHz Linear Phase Filter in an SO-8
Differential Inputs and Outputs
Operates on a Single 5V or a 5V Supply
Low Offset: 5mV Typical
75dB THD and SNR
78dB SNR
Shutdown Mode
Requires No External Components
Requires No External Clock Signal
CDMA Base Stations
Data Communications
Antialiasing Filters
Smoothing or Reconstruction Filters
Matched Filter Pairs
Replacement for LC Filters
Single 5V Supply, Differential 650kHz Lowpass Filter
0.1 F
V
V
IN
IN
+
1
2
3
4
+IN
–IN
GND
V
U
LTC1565-31
SHDN
+OUT
–OUT
V
+
8
7
6
5
U
V
V
5V
OUT
OUT
15645-31 TA01
+
0.1 F
5V
Linear Phase Lowpass Filter
DESCRIPTIO
The LTC
phase lowpass filter. The selectivity of the LTC1565-31,
combined with its linear phase and dynamic range, make it
suitable for filtering in data communications or data acqui-
sition systems. The filter attenuation is 36dB at 2 f
and at least 72dB for frequencies above 3 f
comparable LC filters, the LTC1565-31 achieves this selec-
tivity with a linear phase response in the passband.
With 5% accuracy of the cutoff frequency, the LTC1565-31
can be used in applications requiring pairs of matched filters,
such as transceiver I and Q channels. Furthermore, the
differential inputs and outputs provide a simple interface for
these wireless systems.
With a single 5V supply and a 2V
features an impressive spurious free dynamic range of 75dB.
The maximum signal-to-noise ratio is 78dB and it is achieved
with a 2.5V
The LTC1565-31 features a shutdown mode where power
supply current is typically less than 10 A.
For W-CDMA, 3G, CDMA 2000 and other cellular and
noncellular cutoff frequencies or single-ended I/O, please
contact LTC Marketing for additional information.
, LTC and LT are registered trademarks of Linear Technology Corporation.
650kHz Continuous Time,
®
–100
1565-31 is a 7th order, continuous time, linear
–10
–20
–30
–40
–50
–60
–70
–80
–90
P-P
10
0
10
4
input signal.
Frequency Response
U
10
FREQUENCY (Hz)
DELAY
5
GAIN
P-P
10
6
input, the LTC1565-31
LTC1565-31
1565 G01
10
CUTOFF
7
2.0
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0.9
. Unlike
CUTOFF
1

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ltc1565-31is8-trpbf Summary of contents

Page 1

... LC filters, the LTC1565-31 achieves this selec- tivity with a linear phase response in the passband. With 5% accuracy of the cutoff frequency, the LTC1565-31 can be used in applications requiring pairs of matched filters, such as transceiver I and Q channels. Furthermore, the differential inputs and outputs provide a simple interface for these wireless systems ...

Page 2

... MAXIMUM (Note 1) Total Supply Voltage ............................................... 11V Power Dissipation ............................................. 500mW Operating Temperature Range LTC1565-31CS8 ..................................... LTC1565-31IS8 ................................. – Storage Temperature Range ................ – 150 C Lead Temperature (Soldering, 10 sec)................. 300 C ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T unless otherwise specified. ...

Page 3

... G01 LTC1565-31 MIN TYP MAX – 400 – 400 2.49 2.51 2.52 4.2 3.3 2.9 2 specified for a 3.8 square inch test JA Passband Gain and Delay vs Frequency 2.0 GAIN 1.9 ...

Page 4

... LTC1565- TYPICAL PERFOR A CE CHARACTERISTICS Passband Gain vs Frequency Over Temperature 0 0.4 0.3 0.2 – –0.1 –0.2 –0.3 –0.4 –0.5 25k 100k 400k FREQUENCY (Hz) 1565 G03 Common Mode Rejection Ratio 110 P 100 ...

Page 5

... LTC1565-31 goes into the current saving shutdown mode. Pin 5 has pull-up current. Leaving Pin 5 open will place the LTC1565-31 in its normal operating mode. – OUT, + OUT (Pins 7, 8): Output Pins. Pins 7 and 8 are the filter differential output. Each pin can drive 1k or 300pF loads ...

Page 6

... U U APPLICATIONS INFORMATION Interfacing to the LTC1565-31 The difference between the voltages at Pin 1 and Pin 2 is the “differential input voltage.” The average of the voltages at Pin 1 and Pin 2 is the “common mode input voltage.” The difference between the voltages at Pin 7 and Pin 8 is the “ ...

Page 7

... THD versus output common mode voltage for a 2V mode input voltage that is 0.5V below mid supply. Figure 7. THD vs Common Mode Output Voltage 3.0 3.5 ) P-P 1565-31 F06 Figure 8. THD vs Common Mode Output Voltage LTC1565-31 differential input voltage and a common P 100kHz IN P-P V ...

Page 8

... F AMPLIFIERS A4 AND A5 ALLOW MONITORING/MEASURING THE DIFFERENTIAL OUTPUT WITH A SINGLE-ENDED, GROUND- 6 REFERENCED INSTRUMENT 0 +IN +OUT 6 – –IN –OUT LTC1565- GND V 0 – V SHDN 0 TOTAL INTEGRATED NOISE 104 V RMS 118 V RMS = 650kHz CUTOFF TOTAL INTEGRATED NOISE • ...

Page 9

... LTC1565- GND 0.1 F 2.49k 4 5 – V SHDN NOTE: FOR SINGLE 5V SUPPLY CONNECTION, PIN 4 (LTC1565-31) AND PIN 4 (LT1809) SHOULD BE GROUNDED AND RESISTOR R2 SHOULD BE DC BIASED AT APPROXIMATELY 2.5V (SEE TEST CIRCUIT FOR SINGLE SUPPLY OPERATION +IN +OUT – ...

Page 10

... DATA 2 –IN 4.99k LTC1565-31 3 GND 0 – V Simple Pulse Shaping Circuit for Single 5V Operation, 2Mbps (1Msps) 4 Level Data 5V 4.99k 4.99k D1 1Msps 1 +IN DATA 10k 2 D0 –IN 4.99k LTC1565-31 3 GND 0 – +OUT OUT 7 – V –OUT OUT 0.1 F SHDN ...

Page 11

... TYP 0.014 – 0.019 (0.355 – 0.483) TYP LTC1565-31 ADC I DSP Q ADC 1565-31 TA03 0.150 – 0.157** (3.810 – 3.988) 2 ...

Page 12

... FREQUENCY (Hz) 1565 TA12 COMMENTS +IN +OUT V OUT1 –IN –OUT OUT2 U2 LTC1565-31 FGND GND 0.1 F – 0 SHDN 15645-31 TA11 5V = 500kHz or 1MHz CUTOFF = 150kHz (LTC1562), CUTOFF(MAX) = 300kHz (LTC1562-2) CUTOFF(MAX) = 256kHz CUTOFF(MAX) /f ...

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