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LT1567
1
1567fa
, LTC, LT and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
The LT
1567 is an analog building block optimized for
very low noise high frequency filter applications. It con-
tains two wideband rail-to-rail operational amplifiers, one
of them internally configured as a unity-gain inverter.
With the addition of a few passive components, the
LT1567 becomes a flexible second order filter section
with cutoff frequency (fC) up to 5MHz, ideal for antialias-
ing or for channel filtering in high speed data communi-
cations systems. A spreadsheet-based design tool is
available at www.linear.com for designing lowpass and
bandpass filters using the LT1567.
In addition to low noise and high speed, the LT1567
features single-ended to differential conversion for direct
driving of high speed differential input A/D converters. The
LT1567 operates from a total power supply voltage of 2.7V
to 12V and supports signal-to-noise ratios above 100dB.
The LT1567 is available in an 8-lead MSOP package.
■ Low Noise, High Speed Filters to 5MHz
■ Low Noise Differential Circuits
■
Communication Channel or Roofing Filters
■ Antialias or Reconstruction Filtering
■ Video Signal Processing
■
Single-Ended to Differential Conversion
2MHz 3-Pole Antialias Filter with
Single-Ended to Differential Conversion
Frequency Response
■ Single-Ended to Differential Conversion
■
Low Noise: 1.4nV/
√Hz
■ 20
VRMS Total Wideband Noise in Filter
with 2MHz fC
■
Dynamic Range: 104dB SNR at
±5V
■ Total Supply Voltage: 2.7V to 12V
■ Rail-to-Rail Outputs
■
DC Accurate: Op Amp VOS 0.5mV (Typ)
■ Trimmed Bandwidth for Accurate Filters
■ No External Clock Required
■
MSOP-8 Surface Mount Package
1.4nV/
√Hz 180MHz
Filter Building Block
FREQUENCY (Hz)
100
GAIN
(dB)
12
6
0
–6
–12
–18
–24
–30
–36
1M
10M
1567 TA01a
NOTE: 6dB GAIN RESULTS FROM
SINGLE-ENDED TO DIFFERENTIAL
CONVERSION
DESCRIPTIO
U
FEATURES
APPLICATIO S
U
TYPICAL APPLICATIO
U
–AIN
+AIN
ADC
1567 TA01
VIN
0.1
F
0.1
F
C1
270pF
C3
270pF
C2
270pF
0.1
F
V–
V+
1
2
3
4
8
7
6
5
R2
536
R3
147
R1
536
R4
147
R5
147
LTC1420
96dB DIFFERENTIAL SNR WITH 3V TOTAL SUPPLY
LT1567
R2
R1
GAIN =
≤ 2.5MHz
f–3dB
R3 = R4 = R5, C1 = C2 = C3
1.82
2
πR2C2
f–3dB =
=
f–3dB ≤ 2.5MHz
;
1
4
πR3C3
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