LT6600 Linear Technology Corporation, LT6600 Datasheet
LT6600
Manufacturer Part Number
LT6600
Description
Very Low Noise, Differential Ampli?er And 2.5mhz Lowpass Filter
Manufacturer
Linear Technology Corporation
Datasheet
1.LT6600.pdf
(16 pages)
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APPLICATIONS
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
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DISCRETE MULTI-TONE
16 BIT 4kHz to 2.5MHz
SIGNAL AT 50MSPS
±0.6dB (Max) Ripple 4th Order Lowpass Filter with
2.5MHz Cutoff
Programmable Differential Gain via Two External
Resistors
Adjustable Output Common Mode Voltage
Operates and Specifi ed with 3V, 5V, ±5V Supplies
86dB S/N with 3V Supply and 1V
Low Distortion, 1V
Fully Differential Inputs and Outputs
Compatible with Popular Differential Amplifi er
Pinouts
SO-8 and DFN-12 Packages
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
1MHz: 95dBc 2nd, 88dBc 3rd
LTC1668
–5V
5V
LADCOM
50MHz
CLK
DAC Output Filter
I
I
OUT A
OUT B
RMS
, 800Ω Load
52.3Ω
52.3Ω
RMS
1580Ω
1580Ω
(S8 Pin Numbers Shown)
Output
1
7
2
8
Amplifi er and 2.5MHz Lowpass Filter
LT6600-2.5
+
–
–5V
5V
3
6
+
–
0.1μF
0.1μF
4
5
660025 TA01a
V
V
OUT
OUT
+
–
–10
–20
–30
–40
–50
–60
–70
–80
–90
Very Low Noise, Differential
0
DESCRIPTION
The LT
with a 4th order 2.5MHz lowpass fi lter approximating a
Chebyshev frequency response. Most differential ampli-
fi ers require many precision external components to tail
or gain and bandwidth. In contrast, with the LT6600-2.5,
two external resistors program differential gain, and the
fi lter’s 2.5MHz cutoff frequency and passband ripple are
internally set. The LT6600-2.5 also provides the necessary
level shifting to set its output common mode voltage to ac-
commodate the reference voltage requirements of A/Ds.
Using a proprietary internal architecture, the LT6600-2.5
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 86dB. 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 LT6600-2.5 also features low voltage operation. The
differential design provides outstanding performance for a
4V
supply. The LT6600-2.5 is available in SO-8 and DFN-12
packages.
For similar devices with higher cutoff frequency, refer
to the LT6600-5, LT6600-10, LT6600-15 and LT6600-20
data sheets.
0
12
P-P
BASEBAND SIGNAL
DAC Output Spectrum
24
signal level while the part operates with a single 3V
®
36
FREQUENCY (MHz)
6600-2.5 combines a fully differential amplifi er
48
DAC OUTPUT IMAGE
60
72
84
96
660025 TA01b
108
120
–10
–20
–30
–40
–50
–60
–70
–80
–90
0
LT6600-2.5 Output Spectrum
0
12
24
LT6600-2.5
36
FREQUENCY (MHz)
48
60
72
84
96
660025 TA01c
660025fb
108
1
120
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