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LTC1565-31_1 Datasheet, PDF (1/12 Pages) Linear Technology – 650kHz Continuous Time, Linear Phase Lowpass Filter | |||
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FEATURES
s 7th Order, 650kHz Linear Phase Filter in an SO-8
s Differential Inputs and Outputs
s Operates on a Single 5V or a ±5V Supply
s Low Offset: 5mV Typical
s 75dB THD and SNR
s 78dB SNR
s Shutdown Mode
s Requires No External Components
s Requires No External Clock Signal
U
APPLICATIO S
s CDMA Base Stations
s Data Communications
s Antialiasing Filters
s Smoothing or Reconstruction Filters
s Matched Filter Pairs
s Replacement for LC Filters
LTC1565-31
650kHz Continuous Time,
Linear Phase Lowpass Filter
DESCRIPTIO
The LTC®1565-31 is a 7th order, continuous time, linear
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 2Ã fCUTOFF
and at least 72dB for frequencies above 3Ã fCUTOFF. Unlike
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 2VP-P input, the LTC1565-31
features an impressive spurious free dynamic range of 75dB.
The maximum signal-to-noise ratio is 78dB and it is achieved
with a 2.5VP-P input signal.
The LTC1565-31 features a shutdown mode where power
supply current is typically less than 10µA.
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.
TYPICAL APPLICATIO
Single 5V Supply, Differential 650kHz Lowpass Filter
VIN+
VINâ
0.1µF
1
+IN
2
âIN
8
+OUT
7
âOUT
LTC1565-31
3
GND
V+ 6
4 Vâ
5
SHDN
VOUT+
VOUTâ
5V
5V
0.1µF
15645-31 TA01
10
0
â10
â20
â30
â40
â50
â60
â70
â80
â90
â100
104
Frequency Response
2.0
GAIN
1.9
1.8
1.7
1.6
DELAY
1.5
1.4
1.3
1.2
1.1
1.0
105
106
FREQUENCY (Hz)
0.9
107
1565 G01
1
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