Data Sheet
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, V
OUT
= 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)
1 nV/√Hz, Low Power,
Rail-to-Rail Output Amplifiers
ADA4896-2/ADA4897-1/ADA4897-2
FUNCTIONAL BLOCK DIAGRAM
NC
1
–IN
2
+IN
3
–V
S 4
8
7
6
5
DISABLE
+V
S
NC
09447-101
OUT
Figure 1. 8-Lead SOIC (ADA4897-1)
8
7
VOLTAGE NOISE (nV/√Hz)
V
S
= ±5V
6
5
4
3
2
1
0
APPLICATIONS
Low noise preamplifier
Ultrasound amplifiers
PLL loop filters
High performance ADC drivers
DAC buffers
1
10
100
1k
10k
100k
1M
5M
FREQUENCY (Hz)
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.
Figure 2. Voltage Noise vs. Frequency
Table 1. Other Low Noise Amplifiers
Part No.
AD797
AD8021
AD8099
AD8045
ADA4899-1
ADA4898-1/
ADA4898-2
V
N
(nV/√Hz)
At 1 kHz
At 100 kHz
0.9
0.9
5
2.1
3
0.95
6
3
1.4
1
0.9
0.9
BW (MHz)
8
490
510
1000
600
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.
AD7944
AD7985
AD7986
Bits
14
16
18
Speed (MSPS)
2.5
2.5
2
Power (mW)
15.5
15.5
15
Rev. B
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2012 Analog Devices, Inc. All rights reserved.
09447-102
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
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
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
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
NXP MCU
京公网安备 11010802033920号
EEWORLD
