LT6604-10
Dual Very Low Noise,
Differential Amplifier and
10MHz Lowpass Filter
DESCRIPTION
FEATURES
TheLT®6604-10consistsoftwomatched, fullydifferential
amplifiers,eachwitha4thorder,10MHzlowpassfilter.The
fixed frequency lowpass filter approximates a Chebyshev
response. By integrating a filter and a differential ampli-
fier, distortion and noise are made exceptionally low. At
unity gain, the measured in band signal-to-noise ratio is
an impressive 82dB. At higher gains, the input referred
noise decreases, allowing the part to process smaller
input differential signals without significantly degrading
the signal-to-noise ratio.
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Dual Differential Amplifier with 10MHz Lowpass Filters
4th Order Filters
Approximates Chebyshev Response
Guaranteed Phase and Gain Matching
Resistor-Programmable Differential Gain
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82dB Signal-to-Noise (3V Supply, 2V Output)
P-P
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Low Distortion, 2V , 800Ω Load
P-P
1MHz: 88dBc 2nd, 97dBc 3rd
5MHz: 74dBc 2nd, 77dBc 3rd
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n
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Specified for Operation with 3V, 5V and 5V Supplies
Fully Differential Inputs and Outputs
Adjustable Output Common Mode Voltage
Small 4mm × 7mm × 0.75mm QFN Package
Gain and phase are highly matched between the two chan-
nels. Gain for each channel is independently programmed
using two external resistors. The LT6604-10 enables level
shifting by providing an adjustable output common mode
voltage, making it ideal for directly interfacing to ADCs.
APPLICATIONS
The LT6604-10 is fully specified for 3V operation. The
differential design enables outstanding performance at
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Dual Differential ADC Driver Plus Filter
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Single-Ended to Differential Converter
a 2V signal level for a single 3V supply. See the back
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P-P
Matched, Dual, Differential Filter Stage
page of this data sheet for a complete list of related single
and dual differential amplifiers with integrated 2.5MHz to
20MHz lowpass filters.
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Common Mode Translation of Differential Signals
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High Speed ADC Antialiasing and DAC Smoothing in
Wireless Infrastructure or Networking Applications
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L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
High Speed Test and Measurement Equipment
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Medical Imaging
TYPICAL APPLICATION
Channel to Channel Gain Matching, VS = 5V
3V
20
50 TYPICAL UNITS
DUAL ADC
LT6604-10
+INA
LTC22xx
+
18
16
14
12
10
8
T
= 25°C
V A
3V
3V
A
402Ω
GAIN = 1
= 10MHz
50Ω
50Ω
0.01μF
+
+
–OUTA
+OUTA
f
IN
V
V
+
AIN
–
–
+
MIDA
18pF
18pF
DOUT
DOUT
OCMA
402Ω
402Ω
–INA
–
+
–
+
+
V B
+INB
V
50Ω
0.01μF
6
–OUTB
+OUTB
+
AIN
–
–
MIDB
4
V
OCMB
50Ω
2
402Ω
+
–INB
–
–
0
–
V
–0.15 –0.1 –0.05
0
0.05 0.1 0.15 0.2 0.25
660410 TA01
GAIN MATCH (dB)
660410 TA01b
660410fb
1
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