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LT6600CS8-15-PBF

Description
Very Low Noise, Differential Amplifi er and 15MHz Lowpass Filter
File Size156KB,12 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LT6600CS8-15-PBF Overview

Very Low Noise, Differential Amplifi er and 15MHz Lowpass Filter

LT6600-15
Very Low Noise, Differential
Amplifier and 15MHz Lowpass Filter
FEATURES
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DESCRIPTION
The LT
®
6600-15 combines a fully differential amplifier with a
4th order 15MHz lowpass filter approximating a Chebyshev
frequency response. Most differential amplifiers require
many precision external components to tailor gain and
bandwidth. In contrast, with the LT6600-15, two external
resistors program differential gain, and the filter’s 15MHz
cutoff frequency and passband ripple are internally set.
The LT6600-15 also provides the necessary level shifting
to set its output common mode voltage to accommodate
the reference voltage requirements of A/Ds.
Using a proprietary internal architecture, the LT6600-15
integrates an antialiasing filter and a differential amplifier/
driver without compromising distortion or low noise perfor-
mance. At unity gain the measured in band signal-to-noise
ratio is an impressive 76dB. At higher gains the input
referred noise decreases so the part can process smaller
input differential signals without significantly degrading
the output signal-to-noise ratio.
The LT6600-15 also features low voltage operation. The
differential design provides outstanding performance for
a 2V
P-P
signal level while the part operates with a single
3V supply.
The LT6600-15 is packaged in an SO-8 and is pin compat-
ible with stand alone differential amplifiers.
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Programmable Differential Gain via Two External
Resistors
Adjustable Output Common Mode Voltage
Operates and Specified with 3V, 5V, ±5V Supplies
0.5dB Ripple 4th Order Lowpass Filter with 15MHz
Cutoff
76dB S/N with 3V Supply and 2V
P-P
Output
Low Distortion, 2V
P-P
, 800Ω Load, V
S
= 3V
1MHz: 86dBc 2nd, 90dBc 3rd
10MHz: 63dBc 2nd, 69dBc 3rd
Fully Differential Inputs and Outputs
Compatible with Popular Differential Amplifier
Pinouts
SO-8 Package
APPLICATIONS
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High Speed ADC Antialiasing and DAC Smoothing in
Networking or Cellular Base Station Applications
High Speed Test and Measurement Equipment
Medical Imaging
Drop-in Replacement for Differential Amplifiers
L,
LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
LT6600-15
3V
0.1μF
R
IN
536Ω 1
7
0.01μF
V
IN
R
IN
536Ω
2
8
3
5.6pF
3V
V
+
D
OUT
V
CM
2.2μF
GAIN = 536Ω/R
IN
660015 TA01a
An 8192 Point FFT Spectrum
LTC2249
0
–10
–20
AMPLITUDE (dB)
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
0
10
20
FREQUENCY (MHz)
660015 TA01b
INPUT 10.7MHz
2V
P-P
f
SAMPLE
= 80MHz
V
MID
V
OCM
+
4
25Ω
5.6pF
5.6pF
+
A
IN
25Ω
5
+
6
V
30
40
660015fa
1

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LT6600CS8-15-PBF LT6600-15 LT6600CS8-15 LT6600IS8-15-PBF
Description Very Low Noise, Differential Amplifi er and 15MHz Lowpass Filter Very Low Noise, Differential Amplifi er and 15MHz Lowpass Filter Very Low Noise, Differential Amplifi er and 15MHz Lowpass Filter Very Low Noise, Differential Amplifi er and 15MHz Lowpass Filter
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