ADA4897-2 Datasheet PDF - Analog Devices

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ADA4897-2
Analog Devices

Part Number ADA4897-2
Description Rail-to-Rail Output Amplifiers
Page 29 Pages


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Data Sheet
1 nV/√Hz, Low Power,
Rail-to-Rail Output Amplifiers
ADA4896-2/ADA4897-1/ADA4897-2
FEATURES
Low wideband noise
1 nV/√Hz
2.8 pA/√Hz
Low 1/f noise: 2.4 nV/√Hz at 10 Hz
Low distortion: −115 dBc at 100 kHz, VOUT = 2 V p-p
Low power: 3 mA per amplifier
Low input offset voltage: 0.5 mV maximum
High speed
−3 dB bandwidth: 230 MHz (G = +1)
Slew rate: 120 V/μs
Settling time to 0.1%: 45 ns
Rail-to-rail output
Wide supply range: 3 V to 10 V
Disable feature (ADA4897-1/ADA4897-2)
APPLICATIONS
Low noise preamplifier
Ultrasound amplifiers
PLL loop filters
High performance ADC drivers
DAC buffers
GENERAL DESCRIPTION
The ADA4896-2/ADA4897-1/ADA4897-2 are unity-gain stable,
low noise, rail-to-rail output, high speed voltage feedback amplifiers
that have a quiescent current of 3 mA. With a 1/f noise of
2.4 nV/√Hz at 10 Hz and a spurious-free dynamic range of −80 dBc
at 2 MHz, the ADA4896-2/ADA4897-1/ADA4897-2 are ideal
solutions in a variety of applications, including ultrasound, low
noise preamplifiers, and drivers of high performance ADCs. The
Analog Devices, Inc., proprietary next-generation SiGe bipolar
process and innovative architecture enable such high performance
amplifiers.
The ADA4896-2/ADA4897-1/ADA4897-2 have 230 MHz
bandwidth, 120 V/μs slew rate, and settle to 0.1% in 45 ns.
With a wide supply voltage range of 3 V to 10 V, the ADA4896-2/
ADA4897-1/ADA4897-2 are ideal candidates for systems that
require high dynamic range, precision, low power, and high speed.
The ADA4896-2 is available in 8-lead LFCSP and 8-lead MSOP
packages. The ADA4897-1 is available in 8-lead SOIC and 6-lead
SOT-23 packages. The ADA4897-2 is available in a 10-lead MSOP
package. The ADA4896-2/ADA4897-1/ADA4897-2 operate over
the extended industrial temperature range of −40°C to +125°C.
FUNCTIONAL BLOCK DIAGRAM
NC 1
–IN 2
+IN 3
–VS 4
8 DISABLE
7 +VS
6 OUT
5 NC
Figure 1. 8-Lead SOIC (ADA4897-1)
8 VS = ±5V
7
6
5
4
3
2
1
0
1 10 100 1k 10k 100k 1M 5M
FREQUENCY (Hz)
Figure 2. Voltage Noise vs. Frequency
Table 1. Other Low Noise Amplifiers
VN (nV/√Hz)
Part No.
At 1 kHz At 100 kHz BW (MHz)
AD797
0.9
0.9
8
AD8021
5
2.1 490
AD8099
3
0.95 510
AD8045
6
3
1000
ADA4899-1 1.4
1
600
ADA4898-1/ 0.9
ADA4898-2
0.9
65
Supply
Voltage (V)
10 to 30
5 to 24
5 to 12
3.3 to 12
5 to 12
10 to 32
Table 2. Complementary ADCs
Part No.
Bits
Speed (MSPS)
AD7944
14
2.5
AD7985
16
2.5
AD7986
18
2
Power (mW)
15.5
15.5
15
Rev. B
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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.
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Tel: 781.329.4700
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©2012 Analog Devices, Inc. All rights reserved.



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IMPORTANT LINKS for the ADA4896-2_4897-1_4897-2*
Last content update 07/24/2013 06:07 pm
PARAMETRIC SELECTION TABLES
Find Similar Products By Operating Parameters
DESIGN TOOLS, MODELS, DRIVERS & SOFTWARE
Analog Filter Wizard 2.0
ADA44896/7 SPICE Macro Model, Ver. 2.1
DOCUMENTATION
AN-0991: Active Filter Evaluation Board for Standard SOIC Op Amps
AN-581: Biasing and Decoupling Op Amps in Single Supply
Applications
AN-402: Replacing Output Clamping Op Amps with Input Clamping
Amps
ADA4895 / 6 / 7 Fastest, Low Noise, Low Power, Rail-to-Rail Amps
Op Amp Applications Handbook
MT-032: Ideal Voltage Feedback (VFB) Op Amp
MT-033: Voltage Feedback Op Amp Gain and Bandwidth
MT-047: Op Amp Noise
MT-048: Op Amp Noise Relationships: 1/f Noise, RMS Noise, and
Equivalent Noise Bandwidth
MT-049: Op Amp Total Output Noise Calculations for Single-Pole
System
MT-050: Op Amp Total Output Noise Calculations for Second-Order
System
MT-052: Op Amp Noise Figure: Don't Be Mislead
MT-053: Op Amp Distortion: HD, THD, THD + N, IMD, SFDR, MTPR
MT-056: High Speed Voltage Feedback Op Amps
MT-058: Effects of Feedback Capacitance on VFB and CFB Op Amps
MT-059: Compensating for the Effects of Input Capacitance on VFB
and CFB Op Amps Used in Current-to-Voltage Converters
MT-060: Choosing Between Voltage Feedback and Current Feedback
Op Amps
(For the ADA4897-1 & ADA4897-2) ADA4897-1-EP/ADA4897-2-EP: 1
nV/√Hz, Low Power, Rail-to-Rail Output Amplifiers Data Sheet
(For the ADA4897-1 & ADA4897-2) CN-0307 A 16-Bit, 6 MSPS SAR ADC
System with Low Power Input Drivers and Reference Optimized for
Multiplexed Applications
(For the ADA4896-2) UG-267: Evaluation Board User Guide
(For the ADA4896-2) UG-129: Evaluation Board User Guide
(For the ADA4897-1) UG-127: Universal Evaluation Board for High
Speed Op Amps in SOT-23-5/SOT-23-6 Packages
(For the ADA4897-1) UG-101: Evaluation Board User Guide
EVALUATION KITS & SYMBOLS & FOOTPRINTS
View the Evaluation Boards and Kits page for the ADA4896-2
View the Evaluation Boards and Kits page for the ADA4897-1
View the Evaluation Boards and Kits page for the ADA4897-2
Symbols and Footprints for the ADA4896-2
Symbols and Footprints for the ADA4897-1
Symbols and Footprints for the ADA4897-2
DESIGN COLLABORATION COMMUNITY
Collaborate Online with the ADI support team and other designers
about select ADI products.
Follow us on Twitter: www.twitter.com/ADI_News
Like us on Facebook: www.facebook.com/AnalogDevicesInc
DESIGN SUPPORT
Submit your support request here:
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Embedded Processing and DSP
Telephone our Customer Interaction Centers toll free:
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1800-419-0108
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8-800-555-45-90
Quality and Reliability
Lead(Pb)-Free Data
PRODUCT RECOMMENDATIONS & REFERENCE DESIGNS
(For the ADA4897-1 & ADA4897-2) CN-0307: A 16-Bit, 6 MSPS SAR
ADC System with Low Power Input Drivers and Reference Optimized
for Multiplexed Applications
SAMPLE & BUY
ADA4896-2
ADA4897-1
ADA4897-2
Find Local Distributors
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ADA4896-2/ADA4897-1/ADA4897-2
TABLE OF CONTENTS
Features .............................................................................................. 1 
Applications....................................................................................... 1 
General Description ......................................................................... 1 
Functional Block Diagram .............................................................. 1 
Revision History ............................................................................... 2 
Specifications..................................................................................... 3 
±5 V Supply ................................................................................... 3 
+5 V Supply ................................................................................... 4 
+3 V Supply ................................................................................... 6 
Absolute Maximum Ratings............................................................ 8 
Thermal Resistance ...................................................................... 8 
Maximum Power Dissipation ..................................................... 8 
ESD Caution.................................................................................. 8 
Pin Configurations and Function Descriptions ........................... 9 
Typical Performance Characteristics ........................................... 11 
REVISION HISTORY
4/12—Rev. A to Rev. B
Changed 6-Lead Single SOT-23 (ADA4897-1) Thermal
Reistance from 306°C/W to 150°C/W........................................... 8
Changes to Figure 3.......................................................................... 8
10/11—Rev. 0 to Rev. A
Added ADA4897-2 and 10-Lead MSOP .........................Universal
Change to Table 1 ............................................................................. 1
Changes to Table 3............................................................................ 3
Changes to Table 4............................................................................ 4
Changes to Table 5............................................................................ 6
Changes to Table 7 and Figure 3..................................................... 8
Changes to Figure 4, Table 8, and Table 9 ..................................... 9
Added Figure 8 and Table 10; Renumbered Sequentially ......... 10
Changed Summary Statement for Typical Performance
Characteristics Section................................................................... 11
Changes to Figure 18...................................................................... 12
Change to Figure 20 ....................................................................... 12
Data Sheet
Theory of Operation ...................................................................... 17 
Amplifier Description................................................................ 17 
Input Protection ......................................................................... 17 
Disable Operation ...................................................................... 17 
DC Errors .................................................................................... 18 
Bias Current Cancellation ......................................................... 18 
Noise Considerations................................................................. 19 
Capacitance Drive ...................................................................... 19 
Applications Information .............................................................. 20 
Typical Performance Values...................................................... 20 
Low Noise, Gain Selectable Amplifier..................................... 21 
Medical Ultrasound Applications ............................................ 22 
Layout Considerations............................................................... 24 
Outline Dimensions ....................................................................... 25 
Ordering Guide .......................................................................... 27 
Change to Figure 26; Moved Figure 26........................................ 13
Changes to Figure 37...................................................................... 15
Changes to Amplifier Description Section, Disable Operation
Section, Figure 44, and Figure 45 ................................................. 17
Added Bias Current Cancellation Section, Figure 47,
Table 11, and Table 12.................................................................... 18
Changes to Table 13 ....................................................................... 20
Changes to Low Noise, Gain Selectable Amplifier Section
and Figure 52................................................................................... 21
Deleted Figure 51............................................................................ 22
Changes to Power Supply Bypassing Section ............................. 24
Moved Figure 57 ............................................................................. 25
Moved Figure 58 ............................................................................. 26
Added Figure 60 ............................................................................. 27
Changes to Ordering Guide .......................................................... 27
7/11—Revision 0: Initial Version
Rev. B | Page 2 of 28



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Data Sheet
ADA4896-2/ADA4897-1/ADA4897-2
SPECIFICATIONS
±5 V SUPPLY
TA = 25°C, G = +1, RL = 1 kΩ to ground, unless otherwise noted.
Table 3.
Parameter
DYNAMIC PERFORMANCE
−3 dB Bandwidth
Bandwidth for 0.1 dB Flatness
Slew Rate
Settling Time to 0.1%
Settling Time to 0.01%
NOISE/HARMONIC PERFORMANCE
Harmonic Distortion (SFDR)
Input Voltage Noise
Input Current Noise
0.1 Hz to 10 Hz Noise
DC PERFORMANCE
Input Offset Voltage
Input Offset Voltage Drift
Input Bias Current
Input Bias Current Drift
Input Bias Offset Current
Open-Loop Gain
INPUT CHARACTERISTICS
Input Resistance
Common-Mode
Differential
Input Capacitance
Common-Mode
Differential
Input Common-Mode Voltage Range
Common-Mode Rejection Ratio
(CMRR)
OUTPUT CHARACTERISTICS
Output Overdrive Recovery Time
Output Voltage Swing
Positive
Negative
Output Current
Short-Circuit Current
Capacitive Load Drive
Test Conditions/Comments
G = +1, VOUT = 0.02 V p-p
G = +1, VOUT = 2 V p-p
G = +2, VOUT = 0.02 V p-p
G = +2, VOUT = 2 V p-p, RL = 100 Ω
G = +2, VOUT = 6 V step
G = +2, VOUT = 2 V step
G = +2, VOUT = 2 V step
VOUT = 2 V p-p
fC = 100 kHz
fC = 1 MHz
fC = 2 MHz
fC = 5 MHz
f = 10 Hz
f = 100 kHz
f = 10 Hz
f = 100 kHz
G = +101, RF = 1 kΩ, RG = 10 Ω
VOUT = −4 V to +4 V
VCM = −2 V to +2 V
VIN = ±5 V, G = +2
RL = 1 kΩ
RL = 100 Ω
RL = 1 kΩ
RL = 100 Ω
SFDR = −45 dBc
Sinking/sourcing
30% overshoot, G = +2
Min Typ Max
230
30
90
7
120
45
90
−500
−17
−0.6
100
−115
−93
−80
−61
2.4
1
11
2.8
99
−28
0.2
−11
3
−0.02
110
+500
−4
+0.6
−92
4.85
4.5
−4.85
−4.5
10
10
3
11
−4.9 to +4.1
−120
81
4.96
4.73
−4.97
−4.84
80
135
39
Unit
MHz
MHz
MHz
MHz
V/μs
ns
ns
dBc
dBc
dBc
dBc
nV/√Hz
nV/√Hz
pA/√Hz
pA/√Hz
nV p-p
μV
μV/°C
μA
nA/°C
μA
dB
pF
pF
V
dB
ns
V
V
V
V
mA
mA
pF
Rev.B | Page 3 of 28



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