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Analog Devices Semiconductor Electronic Components Datasheet

ADA4937-1 Datasheet

Ultra-Low Distortion Differential ADC Driver

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ADA4937-1 pdf
Data Sheet
FEATURES
Extremely low harmonic distortion (HD)
−112 dBc HD2 at 10 MHz
−84 dBc HD2 at 70 MHz
−77 dBc HD2 at 100 MHz
−102 dBc HD3 at 10 MHz
−91 dBc HD3 at 70 MHz
−84 dBc HD3 at 100 MHz
Low input voltage noise: 2.2 nV/√Hz
High speed
−3 dB bandwidth of 1.9 GHz, G = 1
Slew rate: 6000 V/μs, 25% to 75%
Fast overdrive recovery of 1 ns
0.5 mV typical offset voltage
Externally adjustable gain
Differential-to-differential or single-ended-to-differential
operation
Adjustable output common-mode voltage
Single-supply operation: 3.3 V to 5 V
APPLICATIONS
ADC drivers
Single-ended-to-differential converters
IF and baseband gain blocks
Differential buffers
Line drivers
GENERAL DESCRIPTION
The ADA4937-1/ADA4937-2 are low noise, ultralow distortion,
high speed differential amplifiers. They are an ideal choice for
driving high performance ADCs with resolutions up to 16 bits
from dc to 100 MHz. The adjustable level of the output common
mode allows the ADA4937-1/ADA4937-2 to match the input
of the ADC. The internal common-mode feedback loop also
provides exceptional output balance as well as suppression of
even-order harmonic distortion products.
With the ADA4937-1/ADA4937-2, differential gain configurations
are easily realized with a simple external feedback network of
four resistors that determine the closed-loop gain of the amplifier.
The ADA4937-1/ADA4937-2 are fabricated using Analog Devices,
Inc., proprietary silicon-germanium (SiGe), complementary
bipolar process, enabling them to achieve very low levels of
distortion with an input voltage noise of only 2.2 nV/√Hz.
The low dc offset and excellent dynamic performance of the
ADA4937-1/ADA4937-2 make them well-suited for a wide
variety of data acquisition and signal processing applications.
Rev. E
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
Ultralow Distortion
Differential ADC Driver
ADA4937-1/ADA4937-2
FUNCTIONAL BLOCK DIAGRAMS
ADA4937-1
–FB 1
+IN 2
–IN 3
+FB 4
12 PD
11 –OUT
10 +OUT
9 VOCM
Figure 1. ADA4937-1
ADA4937-2
–IN1 1
+FB1 2
+VS1 3
+VS1 4
–FB2 5
+IN2 6
18 +OUT1
17 VOCM1
16 –VS2
15 –VS2
14 PD2
13 –OUT2
Figure 2. ADA4937-2
–55 HD2, VS = 5.0V
–60 HD3, VS = 5.0V
–65
HD2, VS = 3.3V
HD3, VS = 3.3V
–70
–75
–80
–85
–90
–95
–100
–105
–110
–115
1
10
FREQUENCY (MHz)
100
Figure 3. Harmonic Distortion vs. Frequency
The ADA4937-1/ADA4937-2 are available in a Pb-free, 3 mm ×
3 mm, 16-lead LFCSP (ADA4937-1, single) or a Pb-free, 4 mm ×
4 mm, 24-lead LFCSP (ADA4937-2, dual). The pinout has been
optimized to facilitate PCB layout and minimize distortion.
The ADA4937-1/ADA4937-2 are specified to operate over the
automotive (−40°C to +105°C) temperature range and between
3.3 V and 5 V supplies.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2007–2015 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com


Analog Devices Semiconductor Electronic Components Datasheet

ADA4937-1 Datasheet

Ultra-Low Distortion Differential ADC Driver

No Preview Available !

ADA4937-1 pdf
ADA4937-1/ADA4937-2
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagrams............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
5 V Operation ............................................................................... 3
3.3 V Operation ............................................................................ 5
Absolute Maximum Ratings............................................................ 7
Thermal Resistance ...................................................................... 7
ESD Caution.................................................................................. 7
Pin Configurations and Function Descriptions ........................... 8
Typical Performance Characteristics ............................................. 9
Test Circuits..................................................................................... 16
Terminology .................................................................................... 17
Theory of Operation ...................................................................... 18
REVISION HISTORY
5/15—Rev. D to Rev. E
Changes to Table 6............................................................................ 7
Updated Outline Dimensions ....................................................... 26
Changes to Ordering Guide .......................................................... 26
8/13—Rev. C to Rev. D
Changes to Input Bias Current Parameter, Table 1 ...................... 3
Changes to Input Bias Current Parameter, Table 3 ...................... 5
Updated Outline Dimensions ....................................................... 26
3/10—Rev. B to Rev. C
Changes to Table 2, Power Supply Parameter............................... 4
Changes to Table 4, Power Supply Parameter............................... 6
Changes to Figure 43...................................................................... 15
Added the Power-Down Operation Section ............................... 20
10/09—Rev. A to Rev. B
Changes to General Description Section ...................................... 1
Changes to Table 1............................................................................ 3
Changes to Operating Temperature Range Parameter, Table 2.. 4
Changes to Table 3............................................................................ 5
Changes to Figure 4.......................................................................... 7
Changes to Figure 5 and Figure 6................................................... 8
Added EP Row to Table 7 and EP Row to Table 8........................ 8
Data Sheet
Analyzing an Application Circuit ............................................ 18
Setting the Closed-Loop Gain .................................................. 18
Estimating the Output Noise Voltage ...................................... 18
Impact of Mismatches in the Feedback Networks................. 19
Calculating the Input Impedance for an Application Circuit
....................................................................................................... 19
Input Common-Mode Voltage Range in Single-Supply
Applications ................................................................................ 20
Setting the Output Common-Mode Voltage .......................... 20
Power-Down Operation ............................................................ 20
Layout, Grounding, and Bypassing.............................................. 22
High Performance ADC Driving ................................................. 23
3.3 V Operation .......................................................................... 25
Outline Dimensions ....................................................................... 26
Ordering Guide .......................................................................... 26
Added Figure 46, Figure 47, and Figure 48; Renumbered
Sequentially ..................................................................................... 15
Changes to Table 9.......................................................................... 18
Changes to Input Common-Mode Voltage Range in Single-
Supply Applications Section.......................................................... 20
Changes to Ordering Guide .......................................................... 26
11/07—Rev. 0 to Rev. A
Added the ADA4937-2 ......................................................Universal
Changes to Features ..........................................................................1
Changes to Specifications.................................................................3
Changes to Figure 4...........................................................................7
Changes to Typical Performance Characteristics..........................9
Inserted Figure 44........................................................................... 15
Added the Terminating a Single-Ended Input Section ............. 19
Changes to Table 10 and Table 11 ................................................ 21
Changes to Layout, Grounding, and Bypassing Section ........... 22
Inserted Figure 59, Figure 60, and Figure 61 .............................. 22
Updated Outline Dimensions....................................................... 26
Changes to Ordering Guide .......................................................... 26
5/07—Revision 0: Initial Version
Rev. E | Page 2 of 28


Part Number ADA4937-1
Description Ultra-Low Distortion Differential ADC Driver
Maker Analog Devices
Total Page 28 Pages
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