LTC1565-31 Datasheet, PDF (1/8 Pages) Linear Technology – 650kHz Continuous Time, Linear Phase Lowpass Filter

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}
Final Electrical Specifications
LTC1565-31
650kHz Continuous Time,
Linear Phase Lowpass Filter
March 2000
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 37dB at 2× f_CUTOFF
and at least 72dB for frequencies above 3× f_CUTOFF. 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 2V_P-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 2.5V_P-P input signal.
The LTC1565-31 features a shutdown mode where power
supply current is reduced to less than 10µA.
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.
TYPICAL APPLICATIO
Single 5V Supply, Differential 650kHz Lowpass Filter
V_IN+
V_IN–
0.1µF
1
+IN
2
–IN
8
+OUT
7
–OUT
LTC1565-31
3
GND
V^{+ 6}
4 _V–
5
SHDN
V_OUT+
V_OUT–
5V
5V
0.1µF
15645-31 TA01
Frequency Response
20
2.0
GAIN
0
1.8
–20
1.6
GROUP DELAY
–40
1.4
–60
1.2
–80
1.0
–100
10⁴
10⁵
10⁶
FREQUENCY (Hz)
0.8
10⁷
1565-31 TA02
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.
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