LTC1565-31 Linear Technology, LTC1565-31 Datasheet

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LTC1565-31

Manufacturer Part Number
LTC1565-31
Description
650kHz Continuous Time/ Linear Phase Lowpass Filter
Manufacturer
Linear Technology
Datasheet

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FEATURES
APPLICATIO S
TYPICAL APPLICATIO
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
+
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.
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 37dB 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 reduced to less than 10 A.
Other cutoff frequencies and single-ended I/O can be pro-
vided upon request. Please contact LTC Marketing.
, LTC and LT are registered trademarks of Linear Technology Corporation.
650kHz Continuous Time,
®
–100
1565-31 is a 7th order, continuous time, linear
–20
–40
–60
–80
P-P
20
0
10
4
input signal.
GROUP DELAY
U
Frequency Response
GAIN
10
FREQUENCY (Hz)
Final Electrical Specifications
5
P-P
10
6
input, the LTC1565-31
LTC1565-31
1565-31 TA02
March 2000
10
CUTOFF
7
2.0
1.8
1.6
1.4
1.2
1.0
0.8
. Unlike
CUTOFF
1

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LTC1565-31 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

... 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 and Pin 5 open unless otherwise specified. ...

Page 3

... Pin 6 to Pin 3 and Pin 4 to Pin 3 with a quality 0.1 F ceramic capacitor. The maximum voltage difference between the ground pin (Pin 3) and the positive supply pin (Pin 6) should not exceed 5.5V. LTC1565-31 = 10k from each output to AC ground, LOAD MIN TYP ...

Page 4

... U U PIN FUNCTIONS SHDN (Pin 5): Shutdown. When the Pin 5 voltage is low, the 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. W BLOCK DIAGRA + +IN 1 – – ...

Page 5

... 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 6

... LTC1565- APPLICATIONS INFORMATION –30 THD THD –40 SNR f = 100kHz IN –50 –60 –70 –80 –90 0.5 1.0 1.5 2.0 2.5 DIFFERENTIAL INPUT ( P-P Figure 5. Dynamic Range Diff-In, Diff-Out input voltages are Pin 1 = 2.5V DC 0.5V and Pin 2 = 2.5V DC 0.5V. Also note Figure 5 shows a 78dB SNR ratio for higher THD levels. ...

Page 7

... Table 2. Wideband Noise vs Supply Voltage 150pF. For POWER SUPPLY Offset The output DC offset of the LTC1565-31 is trimmed to less than 5mV. The trimming is done with V output DC offset will typically change by 1mV when the power supply varies from 5V to 5V. U Dimensions in inches (millimeters) unless otherwise noted. ...

Page 8

... Self Clocked, 10th Order Linear Phase Lowpass Filters Linear Technology Corporation 8 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 www.linear-tech.com Narrowband Cellular Base Station Receiver LTC1565-31 ADC LPF LTC1565-31 ADC LPF COMMENTS f CUTOFF f CUTOFF(MAX) f CUTOFF(MAX) f CUTOFF(MAX) f CLK ...

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