ad8476armz-rl Analog Devices, Inc., ad8476armz-rl Datasheet

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ad8476armz-rl

Manufacturer Part Number
ad8476armz-rl
Description
Low Power, Unity Gain, Fully Differential Amplifier And Adc Driver
Manufacturer
Analog Devices, Inc.
Datasheet
Data Sheet
FEATURES
Very low power
Fully differential or single-ended inputs/outputs
Differential output designed to drive precision ADCs
VOCM pin adjusts output common mode
Robust overvoltage up to 18 V beyond supplies
High performance
Single supply: 3 V to 18 V
Dual supplies: ±1.5 V to ±9 V
APPLICATIONS
ADC driver
Differential instrumentation amplifier building block
Single-ended-to-differential converter
Battery-powered instruments
GENERAL DESCRIPTION
The
amplifier with integrated gain resistors for unity gain. It is an ideal
choice for driving low power, high performance ADCs as a
single-ended-to-differential or differential-to-differential
amplifier. It provides a precision gain of 1, common-mode level
shifting, low temperature drift, and rail-to-rail outputs for
maximum dynamic range.
The
industrial input voltages up to ±23 V while operating on a dual 5 V
supply. Power dissipation on a single 5 V supply is only 1.5 mW.
The
The high current output stage of the part allows it to drive the
Rev. A
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.
330 μA supply current
Drives switched capacitor and Σ-Δ ADCs
Rail-to-rail outputs
Suitable for driving 16-bit converter up to 250 kSPS
39 nV/√Hz output noise
1 ppm/°C gain drift maximum
200 μV maximum output offset
10 V/μs slew rate
5 MHz bandwidth
AD8476
AD8476
AD8476
works well with SAR, Σ-Δ, and pipeline converters.
is a very low power, fully differential precision
also provides overvoltage protection from large
Low Power, Unity Gain, Fully Differential
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
switched capacitor front-end circuits of many ADCs with
minimal error.
Unlike many differential drivers on the market, the
a high precision amplifier. With 200 µV maximum output
offset, 39 nV/√Hz noise, and −102 dB THD + N at 10 kHz, the
AD8476
Considering its low power consumption and high precision, the
slew-enhanced
precision for 250 kSPS acquisition times.
The
package. It is fully specified over the −40°C to +125°C
temperature range.
AD8476
pairs well with low power, high accuracy converters.
Amplifier and ADC Driver
FUNCTIONAL BLOCK DIAGRAM
is available in a space-saving 8-lead MSOP
AD8476
NOTES
1. NC = NO CONNECT.
DO NOT CONNECT TO THIS PIN.
10kΩ
10kΩ
©2011 Analog Devices, Inc. All rights reserved.
has excellent speed, settling to 16-bit
Figure 1.
AD8476
10kΩ
10kΩ
AD8476
www.analog.com
AD8476
is

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ad8476armz-rl Summary of contents

Page 1

... One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 Fax: 781.461.3113 AD8476 10kΩ 10kΩ AD8476 10kΩ 10kΩ DO NOT CONNECT TO THIS PIN. Figure 1. AD8476 has excellent speed, settling to 16-bit www.analog.com ©2011 Analog Devices, Inc. All rights reserved. is ...

Page 2

AD8476 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 Functional Block Diagram .............................................................. 1 General Description ........................................................................... 1 Revision History ............................................................................... 2 Specifications ..................................................................................... 3 Absolute Maximum Ratings ............................................................ 5 Thermal Resistance ...................................................................... 5 Maximum Power Dissipation ..................................................... 5 ...

Page 3

Data Sheet SPECIFICATIONS ±5 V, VOCM = midsupply otherwise noted. Table 1. Parameter Test Conditions/Comments DYNAMIC PERFORMANCE −3 dB Small Signal Bandwidth V = 200 mV p-p OUT −3 dB Large Signal Bandwidth V ...

Page 4

AD8476 Parameter Test Conditions/Comments POWER SUPPLY Specified Supply Voltage Operating Supply Voltage Range Supply Current ± Over Temperature −40°C ≤ T TEMPERATURE RANGE Specified Performance Range 1 Includes amplifier ...

Page 5

Data Sheet ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Supply Voltage Maximum Voltage at Any Input Pin Minimum Voltage at Any Input Pin Storage Temperature Range Specified Temperature Range Package Glass Transition Temperature (T ESD (Human Body Model) Stresses above those ...

Page 6

AD8476 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 4. 8-Lead MSOP Pin Function Descriptions Pin No. Mnemonic Description 1 INN Negative Input . 2 +V Positive Supply VOCM Output Common-Mode Adjust. 4 +OUT Noninverting Output. 5 −OUT Inverting Output. ...

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Data Sheet TYPICAL PERFORMANCE CHARACTERISTICS VOCM connected to 2 NORMALIZED TO 25° –10 –20 –30 –40 –50 –40 –25 – ...

Page 8

AD8476 100 1k 10k 100k FREQUENCY (Hz) Figure 9. Maximum Output Voltage vs. Frequency +V S 0.025 0.050 0.075 0.100 0.125 0.150 0.175 0.175 0.150 0.125 0.100 0.075 0.050 ...

Page 9

Data Sheet –5 –10 –15 –20 –25 –30 –35 – ±5V S – +5V S –50 100 1k 10k 100k FREQUENCY (Hz) Figure 15. Small Signal Frequency Response for Various Supplies 10 5 ...

Page 10

AD8476 5 0 –5 –10 –15 –20 VOCM = 1.0V VOCM = 2.5V VOCM = 4.0V –25 1k 10k 100k FREQUENCY (Hz) Figure 21. Small Signal Frequency Response for Various VOCM Levels 5 POSITIVE OUTPUT (2kΩ LOAD) NEGATIVE OUTPUT (2kΩ ...

Page 11

Data Sheet 500ns/DIV Figure 27. Small Signal Step Response for Various Resistive Loads, V 500ns/DIV Figure 28. Small Signal Step Response for Various Capacitive Loads, V 500ns/DIV Figure 29. VOCM Small Signal Step Response = 10kΩ 2kΩ ...

Page 12

AD8476 3.0 2.5 2.0 1.5 1.0 0.5 0 –0.5 –1.0 –1.5 –2.0 –2.5 –3 TIME (Seconds) Figure 33. 0 Voltage Noise –20 HD2 LOAD L –30 ...

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Data Sheet 0 –10 HD2 (SINGLE-ENDED INPUT) HD3 (SINGLE-ENDED INPUT) –20 HD2 (DIFFERENTIAL INPUT) HD3 (DIFFERENTIAL INPUT) –30 –40 –50 –60 –70 –80 –90 –100 –110 –120 –130 –140 100 1k 10k FREQUENCY (Hz) Figure 39. Harmonic Distortion vs. Input ...

Page 14

AD8476 –30 –40 –50 –60 –70 –80 –90 –100 100 1k 10k 100k FREQUENCY (Hz) Figure 45. Output Balance Error vs. Frequency 10 0 –10 –20 –30 –40 –50 –60 –70 –80 –90 –100 100 105 ...

Page 15

Data Sheet TERMINOLOGY 10kΩ 10kΩ –OUT +IN VOCM AD8476 –IN 10kΩ +OUT 10kΩ Figure 48. Signal and Circuit Definitions Differential Voltage Differential voltage refers to the difference between two node voltages. For example, the output differential voltage (or equivalently, output ...

Page 16

AD8476 THEORY OF OPERATION OVERVIEW The AD8476 is a fully differential amplifier, with integrated laser- trimmed resistors, that provides a precision gain of 1. The internal differential amplifier of the AD8476 conventional operational amplifiers in that it has two outputs ...

Page 17

Data Sheet The AD8476 integrated resistors are precision wafer-laser- trimmed to guarantee a minimum CMRR (32 μV/V), and gain error of less that 0.02%. To achieve equivalent precision and performance using a discrete solution, resistors must be ...

Page 18

AD8476 APPLICATIONS INFORMATION TYPICAL CONFIGURATION The AD8476 is designed to facilitate single-ended-to-differential conversion, common-mode level shifting, and precision processing of signals so that they are compatible with low voltage ADCs. Figure 52 shows a typical connection diagram of the AD8476. ...

Page 19

... ORDERING GUIDE Model 1 Temperature Range AD8476BRMZ −40°C to +125°C AD8476BRMZ-R7 −40°C to +125°C AD8476BRMZ-RL −40°C to +125°C AD8476ARMZ −40°C to +125°C AD8476ARMZ-R7 −40°C to +125°C AD8476ARMZ-RL −40°C to +125°C AD8476-EVALZ RoHS Compliant Part. 3.20 3.00 2.80 5. 4.90 4. ...

Page 20

... AD8476 NOTES ©2011 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D10195-0-11/11(A) Rev Page Data Sheet ...

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