LTC1566-1_15 Datasheet, PDF (1/8 Pages) Linear Technology – Low Noise 2.3MHz Continuous Time Lowpass Filter

LTC1566-1
Low Noise 2.3MHz
Continuous Time Lowpass Filter
FEATURES
■ _{7th Order, 2.3MHz Lowpass Filter in an SO-8}
■ _{62µVRMS Input Referred Noise}
■ _{Operates on a Single 5V or a ±5V Supply}
■ _{Differential Inputs and Outputs}
■ _{Low Offset (3mV typical, 10mVMAX)}
■ _{Adjustable Output Common Mode Voltage}
■ _{40dB Attenuation at 1.5 × fCUTOFF}
■ _{Requires No External Components}
U
APPLICATIO S
■ _{WCDMA Basestations}
■ _{Communication Filters}
■ _{Antialiasing Filters}
■ _{Smoothing or Reconstruction Filters}
■ _{Matched Filter Pairs}
■ _{Replacement for LC Filters}
, LTC and LT are registered trademarks of Linear Technology Corporation.
DESCRIPTIO
The LTC^®1566-1 is a 7th order continuous time lowpass
filter with 12dB of passband gain. The selectivity, linearity
and dynamic range makes the LTC1566-1 suitable for
filtering in data communications or data acquisition
systems. The filter attenuation is 40dB at 1.5 × f_CUTOFF and
at least 60dB for frequencies above 10MHz.
The LTC1566-1 has an input referred noise of 62µV_RMS in
a 2MHz bandwidth. In receiver applications where the
signal levels are small, the filter features 71dB of spurious
free dynamic range.
With 5% accuracy of the cutoff frequency, the LTC1566-1
can be used in applications requiring pairs of matched
filters, such as transceiver I and Q channels.
The differential inputs and outputs provide a simple inter-
face for wireless systems. The high impedance inputs are
easily coupled to differential demodulators or D/A con-
verters. The output DC common mode voltage and output
DC offset voltage are adjustable so the signal path can be
optimized for driving an A/D converter or differential
modulator.
Other cutoff frequencies and single-ended I/O can be
provided upon request. Please contact LTC Marketing.
TYPICAL APPLICATIO
Single 5V Supply, Differential
2.3MHz Lowpass Filter
+ ¹ IN ⁺
OUT ^{+ 8} +
V_IN
LTC1566-1
V_OUT
– ² IN ^–
OUT ^{– 7} –
3
GND
10k
0.1µF
4 _V–
V^{+ 6}
5V
10k
5
V_ODC
0.1µF
1566-1 TA01
20
10
0
–10
–20
–30
–40
–50
–60
–70
–80
0.1
Frequency Response
GAIN
DELAY
1.0
10
FREQUENCY (MHz)
1000
900
800
700
600
500
400
300
200
100
0
100
1566-1 G01
15661fa
1