LT6600-2.5
Very Low Noise, Differential
Ampli er and 2.5MHz Lowpass Filter
FEATURES DESCRIPTION
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0.6dB (Max) Ripple 4th Order Lowpass Filter with
The LT 6600-2.5 combines a fully differential ampli er
2.5MHz Cutoff
with a 4th order 2.5MHz lowpass lter approximating a
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Programmable Differential Gain via Two External
Chebyshev frequency response. Most differential ampli-
Resistors
ers require many precision external components to tail
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Adjustable Output Common Mode Voltage
or gain and bandwidth. In contrast, with the LT6600-2.5,
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Operates and Speci ed with 3V, 5V, 5V Supplies
two external resistors program differential gain, and the
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86dB S/N with 3V Supply and 1V Output
lters 2.5MHz cutoff frequency and passband ripple are
RMS
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Low Distortion, 1V , 800 Load
internally set. The LT6600-2.5 also provides the necessary
RMS
1MHz: 95dBc 2nd, 88dBc 3rd
level shifting to set its output common mode voltage to ac-
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Fully Differential Inputs and Outputs
commodate the reference voltage requirements of A/Ds.
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Compatible with Popular Differential Ampli er
Using a proprietary internal architecture, the LT6600-2.5
Pinouts
integrates an antialiasing lter and a differential ampli-
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SO-8 and DFN-12 Packages
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
APPLICATIONS
input referred noise decreases so the part can process
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High Speed ADC Antialiasing and DAC Smoothing in
smaller input differential signals without signi cantly
Networking or Cellular Basestation Applications
degrading the output signal-to-noise ratio.
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High Speed Test and Measurement Equipment
The LT6600-2.5 also features low voltage operation. The
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Medical Imaging
differential design provides outstanding performance for a
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Drop-in Replacement for Differential Ampli ers
4V signal level while the part operates with a single 3V
P-P
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.
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.
(S8 Pin Numbers Shown)
TYPICAL APPLICATION
DAC Output Filter DAC Output Spectrum LT6600-2.5 Output Spectrum
0 0
5V
10 10
0.1F
5V
20 20
BASEBAND SIGNAL
52.3 1580
3
1
30 30
LADCOM
4
+
V
I OUT
OUT A 7 +
16-BIT 4kHz to 2.5MHz
40 40
LT6600-2.5
52.3
DISCRETE MULTI-TONE LTC1668 2
DAC OUTPUT IMAGE
50 50
SIGNAL AT 50MSPS
I V
OUT B 8
OUT
5
+
CLK 60 60
6
1580
0.1F
70 70
5V 50MHz
80 80
5V
90 90
660025 TA01a
0 12 24 36 48 60 72 84 96 108 120 0 12 24 36 48 60 72 84 96 108 120
FREQUENCY (MHz) FREQUENCY (MHz)
660025 TA01b 660025 TA01c
660025fe
1
(dBm)
(dBm)LT6600-2.5
(Note 1)
ABSOLUTE MAXIMUM RATINGS
Total Supply Voltage .................................................11V Junction Temperature ........................................... 150C
Input Current (Note 8) ..........................................10mA Storage Temperature Range ................... 65C to 150C
Operating Temperature Range (Note 6).... 40C to 85C Lead Temperature (Soldering, 10 sec) .................. 300C
Speci ed Temperature Range (Note 7) .... 40C to 85C
PIN CONFIGURATION
TOP VIEW
TOP VIEW
+
1 12 IN
IN
+
2 NC IN 1 8 IN
NC 11
3 V
V 10
OCM MID
V 2 7 V
OCM MID
12
+
4
V 9 V
+
V 3 6 V
NC 5 8 V
+
+ OUT 4 5 OUT
OUT 6 7 OUT
S8 PACKAGE
DF PACKAGE
8-LEAD PLASTIC SO
12-LEAD (4mm 4mm) PLASTIC DFN
T = 150C, = 100C/W
T = 150C, = 43C/W, = 4C/W JMAX JA
JMAX JA JC
EXPOSED PAD (PIN 13) IS V , MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE
LT6600CS8-2.5#PBF LT6600CS8-2.5#TRPBF 660025 8-Lead Plastic SO 0C to 70C
LT6600IS8-2.5#PBF LT6600IS8-2.5#TRPBF 600I25 8-Lead Plastic SO 40C to 85C
LT6600CDF-2.5#PBF LT6600CDF-2.5#TRPBF 60025 12-Lead (4mm 4mm) Plastic DFN 0C to 70C
LT6600IDF-2.5#PBF LT6600IDF-2.5#TRPBF 60025 12-Lead (4mm 4mm) Plastic DFN 40C to 85C
LEAD BASED FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE
LT6600CS8-2.5 LT6600CS8-2.5#TR 660025 8-Lead Plastic SO 0C to 70C
LT6600IS8-2.5 LT6600IS8-2.5#TR 600I25 8-Lead Plastic SO 40C to 85C
Consult LTC Marketing for parts speci ed with wider operating temperature ranges.
*The temperature grade is identi ed by a label on the shipping container for the DFN Package.
Consult LTC Marketing for information on nonstandard lead based nish parts.
For more information on lead free part marking, go to: