LT6600CS8-15-PBF LINER [Linear Technology], LT6600CS8-15-PBF Datasheet

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LT6600CS8-15-PBF

Manufacturer Part Number
LT6600CS8-15-PBF
Description
Very Low Noise, Differential Amplifi er and 15MHz Lowpass Filter
Manufacturer
LINER [Linear Technology]
Datasheet
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APPLICATIONS
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L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
FEATURES
V
IN
Programmable Differential Gain via Two External
Resistors
Adjustable Output Common Mode Voltage
Operates and Specifi ed with 3V, 5V, ±5V Supplies
0.5dB Ripple 4th Order Lowpass Filter with 15MHz
Cutoff
76dB S/N with 3V Supply and 2V
Low Distortion, 2V
Fully Differential Inputs and Outputs
Compatible with Popular Differential Amplifi er
Pinouts
SO-8 Package
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 Amplifi ers
0.01μF
1MHz: 86dBc 2nd, 90dBc 3rd
10MHz: 63dBc 2nd, 69dBc 3rd
536Ω
R
IN
536Ω
R
IN
GAIN = 536Ω/R
1
7
2
8
LT6600-15
V
V
+
MID
OCM
3
6
3V
+
0.1μF
4
5
IN
P-P
, 800Ω Load, V
25Ω
25Ω
5.6pF
5.6pF
5.6pF
P-P
A
+
IN
Output
S
V
= 3V
CM
LTC2249
3V
V
+
2.2μF
D
Amplifi er and 15MHz Lowpass Filter
V
OUT
660015 TA01a
DESCRIPTION
The LT
4th order 15MHz lowpass fi lter approximating a Chebyshev
frequency response. Most differential amplifi ers require
many precision external components to tailor gain and
bandwidth. In contrast, with the LT6600-15, two external
resistors program differential gain, and the fi lter’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 fi lter and a differential amplifi er/
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 signifi cantly degrading
the output signal-to-noise ratio.
The LT6600-15 also features low voltage operation. The
differential design provides outstanding performance for
a 2V
3V supply.
The LT6600-15 is packaged in an SO-8 and is pin compat-
ible with stand alone differential amplifi ers.
P-P
®
Very Low Noise, Differential
6600-15 combines a fully differential amplifi er with a
signal level while the part operates with a single
–120
–100
–110
–10
–20
–30
–40
–50
–60
–70
–80
–90
0
0
An 8192 Point FFT Spectrum
10
FREQUENCY (MHz)
20
INPUT 10.7MHz
2V
f
SAMPLE
P-P
30
LT6600-15
= 80MHz
660015 TA01b
40
660015fa
1

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