LTC1565-31_15 Datasheet, PDF (1/12 Pages) Linear Technology – 650kHz Continuous Time, Linear Phase Lowpass Filter

FEATURES
n _{7th Order, 650kHz Linear Phase Filter in an SO-8}
n _{Differential Inputs and Outputs}
n _{Operates on a Single 5V or a ±5V Supply}
n _{Low Offset: 5mV Typical}
n _{75dB THD and SNR}
n _{78dB SNR}
n _{Shutdown Mode}
n _{Requires No External Components}
n _{Requires No External Clock Signal}
APPLICATIONS
n _{CDMA Basestations}
n _{Data Communications}
n _{Antialiasing Filters}
n _{Smoothing or Reconstruction Filters}
n _{Matched Filter Pairs}
n _{Replacement for LC Filters}
TYPICAL APPLICATION
Single 5V Supply, Differential 650kHz Lowpass Filter
V_IN+
V_IN–
0.1μF
1 _+IN
2
–IN
+OUT ⁸
7
–OUT
LTC1565-31
3
GND
V^{+ 6}
4 _V–
SHDN ⁵
V_OUT+
V_OUT–
5V
5V
0.1μF
15645-31 TA01
LTC1565-31
650kHz Continuous Time,
Linear Phase Lowpass Filter
DESCRIPTION
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
acquisition systems. The filter attenuation is 36dB at
2× f_CUTOFF and at least 72dB for frequencies above 3×
f_CUTOFF. Unlike comparable LC filters, the LTC1565-31
achieves this selectivity 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 inter-
face 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 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.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
10
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–10010₄
Frequency Response
GAIN
DELAY
10⁵
10⁶
FREQUENCY (Hz)
2.0
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
10^70.9
1565 G01
156531fa
1