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LT6604-2.5 Datasheet(PDF) 1 Page - Linear Technology

Part No. LT6604-2.5
Description  Dual Very Low Noise, Differential Amplifi er and 2.5MHz Lowpass Filter
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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 1 page
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LT6604-2.5
1
660425f
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
Dual Very Low Noise,
Differential Amplifier and
2.5MHz Lowpass Filter
The LT®6604-2.5 consists of two matched, fully differential
amplifiers, each with a 4th order, 2.5MHz lowpass filter. 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 86dB. 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.
Gain and phase are well matched between the two chan-
nels. Gain for each channel is independently programmed
using two external resistors. The LT6604-2.5 enables level
shifting by providing an adjustable output common mode
voltage, making it ideal for directly interfacing to ADCs.
The LT6604-2.5 is fully specified for 3V operation. The
differential design enables outstanding performance up
to a 4VP-P signal level for a single 3V supply.
See the back page of this datasheet for a complete list of
related single and dual differential amplifiers with integrated
2.5MHz to 20MHz lowpass filters.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.v
n Dual Differential Amplifier with 2.5MHz Lowpass Filters
4th Order Filters
Approximates Chebyshev Response
Guaranteed Phase and Gain Matching
Resistor-Programmable Differential Gain
n >86dB Signal-to-Noise (3V Supply, 1VRMS Output)
n Low Distortion (1MHz, 1VRMS Output, 800Ω Load)
HD2: 92dBc
HD3: 88dBc
n Specified for Operation with 3V, 5V and ±5V Supplies
n Fully Differential Inputs and Outputs
n Adjustable Output Common Mode Voltage
n Small 4mm
× 7mm × 0.75mm QFN Package
n Dual Differential ADC Driver and Filter
n Single-Ended to Differential Converter
n Matched, Dual, Differential Gain or Filter Stage
n Common Mode Translation of Differential Signals
n High Speed ADC Antialiasing and DAC Smoothing in
Wireless Infrastructure or Networking Applications
n High Speed Test and Measurement Equipment
n Medical Imaging
Channel to Channel Gain Matching
GAIN MATCH (dB)
18
16
14
12
10
8
6
4
2
660425 TA01b
0
50 TYPICAL UNITS
TA = 25°C
GAIN = 1
fIN = 2.5MHz
–0.25
0.05
–0.05
0.15
–0.15
0.25
0
1580Ω
50Ω
50Ω
1580Ω
3V
3V
+
+
660425 TA01
+
DOUT
DUAL ADC
AIN
LT6604-2.5
LTC22xx
+
1580Ω
1580Ω
3V
V+A
–OUTA
+OUTA
–OUTB
+OUTB
V+B
V+B
+INA
+INB
VMIDA
VMIDB
VOCMA
VOCMB
–INA
–INB
V
+
+
+
DOUT
AIN
+
50Ω
50Ω
18pF
0.01μF
0.01μF
18pF



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