ADA4939-1YCPZ-R2 Analog Devices Inc, ADA4939-1YCPZ-R2 Datasheet

IC,Differential Amplifier,SINGLE,BIPOLAR,LLCC,16PIN,PLASTIC

ADA4939-1YCPZ-R2

Manufacturer Part Number
ADA4939-1YCPZ-R2
Description
IC,Differential Amplifier,SINGLE,BIPOLAR,LLCC,16PIN,PLASTIC
Manufacturer
Analog Devices Inc
Datasheet

Specifications of ADA4939-1YCPZ-R2

Amplifier Type
Differential
Number Of Circuits
1
Output Type
Differential
Slew Rate
6800 V/µs
-3db Bandwidth
1.4GHz
Current - Input Bias
10µA
Voltage - Input Offset
500µV
Current - Supply
36.5mA
Current - Output / Channel
100mA
Voltage - Supply, Single/dual (±)
3 V ~ 5.25 V, ±1.5 V ~ 2.625 V
Operating Temperature
-40°C ~ 105°C
Mounting Type
Surface Mount
Package / Case
16-LFCSP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Gain Bandwidth Product
-
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
FEATURES
Extremely low harmonic distortion
Low input voltage noise: 2.3 nV/√Hz
High speed
±0.5 mV typical offset voltage
Externally adjustable gain
Stable for differential gains ≥2
Differential-to-differential or single-ended-to-differential
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 ADA4939 is a low noise, ultralow distortion, high speed
differential amplifier. It is an ideal choice for driving high
performance ADCs with resolutions up to 16 bits from dc to
100 MHz. The output common-mode voltage is user adjustable
by means of an internal common-mode feedback loop, allowing
the ADA4939 output to match the input of the ADC. The internal
feedback loop also provides exceptional output balance as well as
suppression of even-order harmonic distortion products.
With the ADA4939, 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 ADA4939 is fabricated using Analog Devices, Inc., proprietary
silicon-germanium (SiGe), complementary bipolar process,
enabling it to achieve very low levels of distortion with an input
voltage noise of only 2.3 nV/√Hz. The low dc offset and excellent
dynamic performance of the ADA4939 make it well suited for a
wide variety of data acquisition and signal processing applications.
Rev. 0
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.
Trademarks and registered trademarks are the property of their respective owners.
−102 dBc HD2 @ 10 MHz
−83 dBc HD2 @ 70 MHz
−77 dBc HD2 @ 100 MHz
−101 dBc HD3 @ 10 MHz
−97 dBc HD3 @ 70 MHz
−91 dBc HD3 @ 100 MHz
−3 dB bandwidth of 1.4 GHz, G = 2
Slew rate: 6800 V/μs, 25% to 75%
Fast overdrive recovery of <1 ns
operation
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
The ADA4939 is available in a Pb-free, 3 mm × 3 mm 16-lead
LFCSP (ADA4939-1, single) or a Pb-free, 4 mm × 4 mm 24-lead
LFCSP (ADA4939-2, dual). The pinout has been optimized to
facilitate PCB layout and minimize distortion. The ADA4939-1
and the ADA4939-2 are specified to operate over the −40°C to
+105°C temperature range; both operate on supplies between
3.3 V and 5 V.
–100
–105
–110
–60
–65
–70
–75
–80
–85
–90
–95
1
FUNCTIONAL BLOCK DIAGRAMS
V
OUT, dm
Figure 3. Harmonic Distortion vs. Frequency
ADA4939-1/ADA4939-2
+FB1
HD2
HD3
Differential ADC Driver
–FB2
+V
+V
–IN1
+IN2
–FB
+FB
+IN
–IN
S1
S1
= 2V p-p
1
2
3
4
5
6
1
2
3
4
Figure 1. ADA4939-1
Figure 2. ADA4939-2
©2008 Analog Devices, Inc. All rights reserved.
Ultralow Distortion
ADA4939-1
ADA4939-2
FREQUENCY (MHz)
10
12 PD
11 –OUT
10 +OUT
9 V
18 +OUT1
17 V
16 –V
15 –V
14 PD2
13 –OUT2
OCM
OCM1
S2
S2
www.analog.com
100

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ADA4939-1YCPZ-R2 Summary of contents

Page 1

... FREQUENCY (MHz) Figure 3. Harmonic Distortion vs. Frequency The ADA4939 is available in a Pb-free × 16-lead LFCSP (ADA4939-1, single Pb-free × 24-lead LFCSP (ADA4939-2, dual). The pinout has been optimized to facilitate PCB layout and minimize distortion. The ADA4939-1 and the ADA4939-2 are specified to operate over the −40°C to +105° ...

Page 2

... ADA4939-1/ADA4939-2 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 General Description ......................................................................... 1 Functional Block Diagrams............................................................. 1 Revision History ............................................................................... 2 Specifications..................................................................................... Operation ............................................................................... 3 3.3 V Operation ............................................................................ 5 Absolute Maximum Ratings............................................................ 7 Thermal Resistance ...................................................................... 7 Maximum Power Dissipation ..................................................... 7 ESD Caution.................................................................................. 7 Pin Configurations and Function Descriptions ........................... 8 Typical Performance Characteristics ............................................. 9 Test Circuits..................................................................................... 15 Operational Description................................................................ 16 Definition of Terms.................................................................... 16 REVISION HISTORY 5/08— ...

Page 3

... OUT p-p, 70 MHz OUT p-p, 100 MHz OUT MHz 70.1 MHz p OUT 140 MHz 140.1 MHz p OUT 100 kHz f = 100 kHz f = 100 MHz, ADA4939 / 2.5 V OS, dm OUT, dm DIN+ DIN− variation MIN MAX variation MIN MAX Differential Common mode ∆V /∆V , ∆ ...

Page 4

... ADA4939-1/ADA4939 Performance OCM OUT, cm Table 2. Parameter V DYNAMIC PERFORMANCE OCM −3 dB Bandwidth Slew Rate Input Voltage Noise (RTI) V INPUT CHARACTERISTICS OCM Input Voltage Range Input Resistance Input Offset Voltage V CMRR OCM Gain General Performance Table 3. Parameter POWER SUPPLY Operating Range Quiescent Current per Amplifier ...

Page 5

... V p-p, 10 MHz OUT p-p, 70 MHz OUT p-p, 100 MHz OUT MHz 70.1 MHz p OUT 140 MHz 140.1 MHz p OUT 100 kHz f = 100 kHz f = 100 MHz, ADA4939 / OS, dm OUT, dm DIN+ DIN− variation MIN MAX variation MIN MAX Differential Common mode ∆ ...

Page 6

... ADA4939-1/ADA4939 Performance OCM OUT, cm Table 5. Parameter V DYNAMIC PERFORMANCE OCM −3 dB Bandwidth Slew Rate Input Voltage Noise (RTI) V INPUT CHARACTERISTICS OCM Input Voltage Range Input Resistance Input Offset Voltage V CMRR OCM Gain General Performance Table 6. Parameter POWER SUPPLY Operating Range Quiescent Current per Amplifier ...

Page 7

... ADA4939-1, 16-Lead LFCSP (Exposed Pad) ADA4939-2, 24-Lead LFCSP (Exposed Pad) MAXIMUM POWER DISSIPATION The maximum safe power dissipation in the ADA4939 package is limited by the associated rise in junction temperature (T the die. At approximately 150°C, which is the glass transition temperature, the plastic changes its properties. Even temporarily ...

Page 8

... Scale) + Figure 5. ADA4939-1 Pin Configuration Table 9. ADA4939-1 Pin Function Descriptions Pin No. Mnemonic 1 −FB 2 +IN 3 − OCM 10 +OUT 11 −OUT −V S Table 10. ADA4939-2 Pin Function Descriptions Pin No. Mnemonic 1 −IN1 2 +FB1 −FB2 6 +IN2 7 −IN2 8 +FB2 OCM2 12 +OUT2 13 −OUT2 14 PD2 15, 16 −V S2 ...

Page 9

... Figure 11. Large Signal Frequency Response for Various Supplies –1 –2 –3 –4 –5 –6 –7 –8 –9 –10 –11 –12 1k Figure 12. Large Signal Frequency Response for Various Temperatures Rev Page ADA4939-1/ADA4939 kΩ, unless otherwise noted p-p OUT 200Ω 60.4Ω +2. 127Ω 66.3Ω +3. 80.6Ω 76.8Ω ...

Page 10

... ADA4939-1/ADA4939 100mV p-p OUT –1 –2 –3 –4 –5 –6 –7 –8 –9 – 1kΩ L – 200Ω L – 100 FREQUENCY (MHz) Figure 13. Small Signal Frequency Response for Various Loads 100mV p-p OUT –3 – 1.0V OCM V = 3.9V OCM V = 2.5V OCM – ...

Page 11

... HD2 10MHz HD3 10MHz –65 HD2 70MHz HD3 70MHz –70 1 Rev Page ADA4939-1/ADA4939-2 HD2, V HD3, V HD2, V HD3 p-p) OUT, dm and Supply Voltage MHz OUT p-p OUT ±2.5V S 69.6 69.7 69 ...

Page 12

... ADA4939-1/ADA4939-2 – HD2 p-p OUT HD3 p-p OUT HD2 p-p –70 OUT HD3 p-p OUT, dm –80 –90 –100 –110 –120 1 10 FREQUENCY (MHz) Figure 25. Harmonic Distortion vs. Frequency at Various Output Voltages – 200Ω –40 –50 –60 –70 –80 –90 –100 1 10 FREQUENCY (MHz) Figure 26 ...

Page 13

... Rev Page ADA4939-1/ADA4939-2 – 200Ω –50 –60 –70 INPUT AMP 1 TO OUTPUT AMP 2 –80 –90 INPUT AMP 2 TO OUTPUT AMP 100 FREQUENCY (MHz) Figure 34. Crosstalk vs. Frequency for ADA4939 –1 –2 –3 – TIME (ns) Figure 35. Large Signal Pulse Response 4.5 4.0 3 ...

Page 14

... ADA4939-1/ADA4939-2 3.5 3.0 V OUT, dm 2.5 2.0 PD 1.5 1.0 0.5 0 –0.5 0 100 200 300 400 500 600 TIME (ns) Figure 37. PD Response Time R = 200Ω 100 700 800 900 1000 Rev Page 100 1k 10k 100k FREQUENCY (Hz) Figure 38. Voltage Noise Spectral Density, RTI 1M 10M ...

Page 15

... LOW-PASS FILTER V ADA4939 60.4Ω OCM 0.1µF 200Ω 0.1µF 402Ω Figure 41. Test Circuit for Distortion Measurements Rev Page ADA4939-1/ADA4939-2 1kΩ NETWORK ANALYZER INPUT 49.9Ω AC-COUPLED 50Ω 49.9Ω 200Ω 50Ω 442Ω 2:1 ...

Page 16

... ADA4939-1/ADA4939-2 OPERATIONAL DESCRIPTION DEFINITION OF TERMS – +IN –OUT + ADA4939 OCM –D IN –IN +OUT +FB Figure 42. Circuit Definitions Differential Voltage Differential voltage refers to the difference between two node voltages. For example, the output differential voltage (or equivalently, output differential-mode voltage) is defined − OUT, dm +OUT −OUT ...

Page 17

... THEORY OF OPERATION The ADA4939 differs from conventional op amps in that it has two outputs whose voltages move in opposite directions and an additional input Like an op amp, it relies on high open- OCM loop gain and negative feedback to force these outputs to the desired voltages. The ADA4939 behaves much like a standard ...

Page 18

... ADA4939-1/ADA4939-2 Table 11. Output Noise Voltage Density Calculations for Matched Feedback Networks Input Noise Contribution Input Noise Term Differential Input v nIN Inverting Input i nIN Noninverting Input i nIN V Input v OCM nCM Gain Resistor nRG1 Gain Resistor nRG2 Feedback Resistor nRF1 Feedback Resistor nRF2 Table 12 ...

Page 19

... R Terminating a Single-Ended Input This section deals with how to properly terminate a single- ended input to the ADA4939 with a gain between the inputs R = 200 Ω. An example using an input source with a terminated . ...

Page 20

... F G without modifying p-p, R OUT = Desired 227 − = OUT , 422Ω p 50Ω 200Ω 60.4Ω ADA4939 OCM R G 200Ω 27.4Ω – 422Ω is increased G . This TH must Ω Ω 417 − OUT 2.02V p-p ...

Page 21

... MINIMUM R VALUE OF 50 Ω G Due to the wide bandwidth of the ADA4939, the value greater than or equal to 50 Ω to provide sufficient damping in the amplifier front end. In the terminated case, R Thevenin resistance of the source and load terminations. ...

Page 22

... ADA4939-1/ADA4939-2 LAYOUT, GROUNDING, AND BYPASSING As a high speed device, the ADA4939 is sensitive to the PCB environment in which it operates. Realizing its superior performance requires attention to the details of high speed PCB design. This section shows a detailed example of how the ADA4939-1 was addressed. The first requirement is a solid ground plane that covers as much of the board area around the ADA4939-1 as possible ...

Page 23

... SIGNAL GENERATOR 0.1µF Figure 54. ADA4939 Driving an AD9445 ADC with AC-Coupled Input and Output In this example, the signal generator has p-p symmetric, ground-referenced bipolar output when terminated in 50 Ω. The V OCM and left floating such that the internal divider sets the output common-mode voltage nominally at midsupply ...

Page 24

... SEATING PLANE PIN 1 INDICATOR 1.00 0.85 0.80 SEATING PLANE ORDERING GUIDE Model Temperature Range 1 ADA4939-1YCPZ-R2 −40°C to +105°C 1 ADA4939-1YCPZ-RL −40°C to +105°C 1 ADA4939-1YCPZ-R7 −40°C to +105°C 1 ADA4939-2YCPZ-R2 −40°C to +105°C 1 ADA4939-2YCPZ-RL −40°C to +105°C 1 ADA4939-2YCPZ-R7 − ...

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