LT6600-10
1
66001fe
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
Very Low Noise, Differential
Amplifi
er and 10MHz Lowpass Filter
The LT
®
6600-10 combines a fully differential amplifi er with a
4th order 10MHz 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 LT6600-10, two external
resistors program differential gain, and the fi lter’s 10MHz
cutoff frequency and passband ripple are internally set.
The LT6600-10 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 LT6600-10
integrates an antialiasing fi lter and a differential ampli-
fi er/driver without compromising distortion or low noise
performance. At unity gain the measured in band signal-
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 signifi cantly
degrading the output signal-to-noise ratio.
The LT6600-10 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.
For similar devices with other cutoff frequencies, refer to
the LT6600-20, LT6600-15, LT6600-5 and LT6600-2.5.
An 8192 Point FFT Spectrum
n
Programmable Differential Gain via Two External
Resistors
n
Adjustable Output Common Mode Voltage
n
Operates and Specifi ed with 3V, 5V, ±5V Supplies
n
0.5dB Ripple 4th Order Lowpass Filter with 10MHz
Cutoff
n
82dB S/N with 3V Supply and 2V
P-P
Output
n
Low Distortion, 2V
P-P
, 800 Load
1MHz: 88dBc 2nd, 97dBc 3rd
5MHz: 74dBc 2nd, 77dBc 3rd
n
Fully Differential Inputs and Outputs
n
Compatible with Popular Differential Amplifi er Pinouts
n
SO-8 and DFN-12 Packages
n
High Speed ADC Antialiasing and DAC Smoothing in
Networking or Cellular Base Station Applications
n
High Speed Test and Measurement Equipment
n
Medical Imaging
n
Drop-In Replacement for Differential Amplifi ers
–
+
–
+
R
IN
402
R
IN
402
0.01µF
0.1µF
49.9
49.9
18pF
5V
5V
–
+
V
MID
V
OCM
V
IN
V
CM
A
IN
V
+
V
–
D
OUT
LT6600-10
LTC1748
3
4
1
7
2
8
5
6
6600 TA01a
GAIN = 402/R
IN
1µF
FREQUENCY (MHz)
0
FREQUENCY (dB)
4 8 12 16 20 24 28
32
6600 TA01b
–10
0
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
INPUT IS A 4.7MHz SINEWAVE
2V
P-P
f
SAMPLE
= 66MHz
(S8 pin numbers shown)
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
