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AD604
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AD604
Rev. E | Page 32 of 32
NOTES
©1996–2008 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the prop
erty of their respective owners.
D00540-0-10/08(E)
Contents
Main
Dual, Ultralow Noise Variable Gain Amplifier
FEATURES
APPLICATIONS
FUNCTIONAL BLOCK DIAGRAM
GENERAL DESCRIPTION
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TABLE OF CONTENTS
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SPECIFICATIONS
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ABSOLUTE MAXIMUM RATINGS
ESD CAUTION
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PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
Table 3. Pin Function Descriptions
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Figure 8. Gain Error vs. VGN at Different Frequencies
Figure 5. Gain vs. VGN for Different Gain Scalings
GAIN SCALING (dB/V)
Figure 9. Gain Error vs. VGN for Two Gain Scaling Values
Figure 14. Output Referred Noise vs. VGN for Three Temperatures
Figure 11. Gain Match; VGN1 = VGN2 = 2.50 V
PERCENTAGE
Figure 15. Input Referred Noise vs. VGN
Figure 20. Noise Figure vs. VGN
00.40.81.21.62.02.42.8
0
2
Rev. E | Page 10 of 3
Figure 21. Harmonic Distortion vs. Frequency
Figure 26. Third-Order Intercept vs. VGN
100ns/DIV
Figure 32. DSX Common-Mode Rejection Ratio vs. Frequency
CROSSTALK (dB)
100ns/DIV
INPUT IMPEDANCE ()
DELAY (ns)
Figure 34. Input Bias Current vs. Temperature
SUPPLY CURRENT (mA)
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THEORY OF OPERATION
PREAMPLIFIER
()
()
[]
()
DIFFERENTIAL LADDER (ATTENUATOR)
AC COUPLING
GAIN CONTROL INTERFACE
ACTIVE FEEDBACK AMPLIFIER (FIXED-GAIN AMP)
Page
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APPLICATIONS INFORMATION
ULTRALOW NOISE AGC AMPLIFIER WITH 82 dB TO 96 dB GAIN RANGE
Page
Rev. E | Page 21 of 3
500mV
100 90 80 70 60 50 40 30 20 10 0 10
ULTRALOW NOISE, DIFFERENTIAL INPUT- DIFFERENTIAL OUTPUT VGA
the signal amplitude compared with when they are driven single-ended.
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Figure 50. Ultralow Noise, Differential Input-Differential Output VGA
20ns20mV
MEDICAL ULTRASOUND TGC DRIVING THE AD9050, A 10-BIT, 40 MSPS ADC
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AD9050
AD7226
AD9631
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Figure 53. Basic Test Board
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Figure 54. Setup for Gain Measurements
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EVALUATION BOARD
DSX INPUT CONNECTIONS
Differential DSX Inputs
USING THE PREAMPLIFIER
PREAMPLIFIER GAIN
OUTPUTS
DC OPERATING CONDITIONS
EVALUATION BOARD ARTWORK AND SCHEMATIC
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Figure 61. Evaluation Board Schematic
Table 6. Bill of Materials
40 MHz dual low noise VGA
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OUTLINE DIMENSIONS
ORDERING GUIDE