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LT6604-5 Datasheet, PDF (1/16 Pages) Linear Technology – Dual Very Low Noise, Differential Amplifi er and 5MHz Lowpass Filter | |||
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FEATURES
n Dual Differential Ampliï¬er with 5MHz Lowpass Filters
4th Order Filters
Approximates Chebyshev Response
Guaranteed Phase and Gain Matching
Resistor-Programmable Differential Gain
n >82dB Signal-to-Noise (3V Supply, 2VP-P Output)
n Low Distortion (1MHz, 2VP-P Output, 800Ω Load)
HD2: 93dBc
HD3: 96dBc
n Speciï¬ed for Operation with 3V, 5V and ±5V Supplies
n Fully Differential Inputs and Outputs
n Adjustable Output Common Mode Voltage
n Small 4mm à 7mm à 0.75mm QFN Package
APPLICATIONS
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
LT6604-5
Dual Very Low Noise,
Differential Ampliï¬er and
5MHz Lowpass Filter
DESCRIPTION
The LT®6604-5 consists of two matched, fully differential
ampliï¬ers, each with a 4th order, 5MHz lowpass ï¬lter. The
ï¬xed frequency lowpass ï¬lter approximates a Chebyshev
response. By integrating a ï¬lter and a differential ampli-
ï¬er, 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 signiï¬cantly 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 LT6604-5 enables level
shifting by providing an adjustable output common mode
voltage, making it ideal for directly interfacing to ADCs.
The LT6604-5 is fully speciï¬ed for 3V operation. The dif-
ferential design enables outstanding performance at a
2VP-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 ampliï¬ers with integrated
2.5MHz to 20MHz lowpass ï¬lters.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
TYPICAL APPLICATION
806Ω
â
0.01μF
+
806Ω
806Ω
â
0.01μF
+
806Ω
LT6604-5
+INA +
VMIDA
â
VOCMA
âINA â +
+INB +
VMIDB
â
VOCMB
âINB â +
Vâ
V+A
âOUTA
3V
50Ω
+OUTA
50Ω
V+B
âOUTB
3V
50Ω
+OUTB
50Ω
3V
LTC22xx
DUAL ADC
18pF AIN
DOUT
18pF AIN
DOUT
66045 TA01
Channel to Channel Gain Matching
25
50 TYPICAL UNITS
TA = 25°C
GAIN = 1
20 fIN = 5MHz
15
10
5
0
â0.20
â0.10
0
0.10
GAIN MATCH (dB)
0.20
66045 TA01b
66045f
1
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