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LT6600CS8-10 Datasheet, PDF (1/12 Pages) Linear Technology – Very Low Noise, Differential Amplifier and 10MHz Lowpass Filter | |||
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LT6600-10
Very Low Noise, Differential
Amplifier and 10MHz Lowpass Filter
FEATURES
s Programmable Differential Gain via Two External
Resistors
s Adjustable Output Common Mode Voltage
s Operates and Specified with 3V, 5V, ±5V Supplies
s 0.5dB Ripple 4th Order Lowpass Filter with 10MHz
Cutoff
s 82dB S/N with 3V Supply and 2VP-P Output
s Low Distortion, 2VP-P, 800⦠Load
1MHz: 88dBc 2nd, 97dBc 3rd
5MHz: 74dBc 2nd, 77dBc 3rd
s Fully Differential Inputs and Outputs
s SO-8 Package
s Compatible with Popular Differential Amplifier
Pinouts
U
APPLICATIO S
s High Speed ADC Antialiasing and DAC Smoothing in
Networking or Cellular Base Station Applications
s High Speed Test and Measurement Equipment
s Medical Imaging
s Drop-in Replacement for Differential Amplifiers
, LTC and LT are registered trademarks of Linear Technology Corporation.
DESCRIPTIO
The LT®6600-10 combines a fully differential amplifier
with a 4th order 10MHz lowpass filter 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 filterâs
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 accom-
modate the reference voltage requirements of A/Ds.
Using a proprietary internal architecture, the LT6600-10
integrates an antialiasing filter and a differential amplifier/
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 2VP-P signal level while the part operates with a single 3V
supply.
For similar devices with other cutoff frequencies, refer to
the LT6600-20 and LT6600-2.5.
TYPICAL APPLICATIO
LT6600-10
5V
0.1µF
RIN
402â¦
1
7
3
â +4
VMID
0.01µF
VIN
2
8
VOCM
+
â
5
RIN
6
402â¦
49.9â¦
49.9â¦
GAIN = 402â¦/RIN
5V
V+
+
18pF
AIN LTC1748
â
VCM
DOUT
Vâ
1µF
6600 TA01a
An 8192 Point FFT Spectrum
0
INPUT IS A 4.7MHz SINEWAVE
â10
2VP-P
â20
fSAMPLE = 66MHz
â30
â40
â50
â60
â70
â80
â90
â100
â110
0 4 8 12 16 20 24 28 32
FREQUENCY (MHz)
6600 TA01b
6600f
1
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