LT1567_15 Datasheet, PDF (1/16 Pages) Linear Technology – Filter Building Block

LT1567
1.4nV/√Hz 180MHz
Filter Building Block
FEATURES
■ _{Single-Ended to Differential Conversion}
■ _{Low Noise: 1.4nV/√Hz}
■ _{20µVRMS Total Wideband Noise in Filter}
with 2MHz f_C
■ _{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}
U
APPLICATIO S
■ _{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}
DESCRIPTIO
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 (f_C) 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.
, LTC, LT and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
R1
536Ω
V_IN
C1
270pF
2MHz 3-Pole Antialias Filter with
Single-Ended to Differential Conversion
R2
536Ω
V⁺
0.1µF
C2
R3 _270pF
147Ω
1
8
0.1µF
2
7
3 ^LT1567
6
R4
147Ω
C3
270pF
4
0.1µF
5
R5
147Ω
1567 TA01
V^–
96dB DIFFERENTIAL SNR WITH 3V TOTAL SUPPLY
GAIN
=
R2
R1
≤
2.5MHz
f_–3dB
R3 = R4 = R5, C1 = C2 = C3
f_–3dB
=
1.82
2πR2C2
=
1;
4πR3C3
f_–3dB
≤
2.5MHz
+A_IN
ADC
–A_IN
LTC1420
Frequency Response
12
6
0
–6
–12
–18
–24
NOTE: 6dB GAIN RESULTS FROM
–30 _{SINGLE-ENDED TO DIFFERENTIAL}
CONVERSION
–36
100
1M
FREQUENCY (Hz)
10M
1567 TA01a
1567fa
1