LT6600-5
Very Low Noise, Differential
Amplifier and 5MHz Lowpass Filter
FEATURES
DESCRIPTION
TheLT®6600-5combinesafullydifferentialamplifierwitha
4thorder5MHzlowpassfilterapproximatinga Chebyshev
frequency response. Most differential amplifiers require
many precision external components to tailor gain and
bandwidth. In contrast, with the LT6600-5, two external
resistors program differential gain, and the filter’s 5MHz
cutoff frequency and passband ripple are internally set.
The LT6600-5 also provides the necessary level shifting
to set its output common mode voltage to accommodate
the reference voltage requirements of A/Ds.
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Programmable Differential Gain via Two External
Resistors
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Adjustable Output Common Mode Voltage
Operates and Specified with 3V, 5V, 5V Supplies
0.5dB Ripple 4th Order Lowpass Filter with 5MHz
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Cutoff
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82dB S/N with 3V Supply and 2V Output
Low Distortion, 2V , 800Ω Load
P-P
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P-P
1MHz: 93dBc 2nd, 96dBc 3rd
Fully Differential Inputs and Outputs
Compatible with Popular Differential Amplifier
Pinouts
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Using a proprietary internal architecture, the LT6600-5
integrates an antialiasing filter and a differential ampli-
fier/driver without compromising distortion or low noise
performance. At unity gain the measured in band sig-
nal-to-noise ratio is an impressive 82dB. 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.
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Available in an SO-8 Package
APPLICATIONS
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High Speed ADC Antialiasing and DAC Smoothing in
Networking or Cellular Base Station Applications
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High Speed Test and Measurement Equipment
Medical Imaging
Drop-in Replacement for Differential Amplifiers
The LT6600-5 also features low voltage operation. The
differential design provides outstanding performance for
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a 2V signal level while the part operates with a single
P-P
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
3V supply.
For similar devices with other cutoff frequencies, refer to
the LT6600-20, LT6600-10 and LT6600-2.5.
TYPICAL APPLICATION
Dual, Matched, 5MHz Lowpass Filter
5MHz Phase Distribution
(50 Units)
3V
0.1μF
30
25
20
15
10
5
R
IN
3
1
4
–
+
0.01μF
7
2
8
I
IN
LT6600-5
Q
OUT
–
6
+
5
R
IN
806ꢀ
GAIN =
R
V
IN
OCM
(1V-1.5V)
3V 0.1μF
R
3
4
IN
1
–
+
LT6600-5
–
0.01μF
7
2
8
Q
I
IN
OUT
0
–135 –134.5–134–133.5–133–132.5–132–131.5
+
5
5MHz PHASE (DEG)
R
6
IN
66005 TA01
66005fa
1