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AD8021 반도체 회로 부품 판매점

High Speed Amplifier



Analog Devices 로고
Analog Devices
AD8021 데이터시트, 핀배열, 회로
Low Noise, High Speed Amplifier
for 16-Bit Systems
AD8021
FEATURES
CONNECTION DIAGRAM
Low noise
2.1 nV/√Hz input voltage noise
LOGIC
REFERENCE
1
AD8021
8 DISABLE
2.1 pA/√Hz input current noise
–IN 2
7 +VS
Custom compensation
Constant bandwidth from G = −1 to G = −10
High speed
+IN 3
–VS 4
6 VOUT
5 CCOMP
200 MHz (G = −1)
Figure 1. SOIC-8 (R-8) and MSOP-8 (RM-8)
190 MHz (G = −10)
Low power
34 mW or 6.7 mA typical for 5 V supply
Output disable feature, 1.3 mA
Low distortion
−93 dBc second harmonic, fC = 1 MHz
−108 dBc third harmonic, fC = 1 MHz
DC precision
1 mV maximum input offset voltage
0.5 μV/°C input offset voltage drift
Wide supply range, 5 V to 24 V
Low price
Small packaging
Available in SOIC-8 and MSOP-8
The AD8021 allows the user to choose the gain bandwidth
product that best suits the application. With a single capacitor,
the user can compensate the AD8021 for the desired gain with
little trade-off in bandwidth. The AD8021 is a well-behaved
amplifier that settles to 0.01% in 23 ns for a 1 V step. It has a fast
overload recovery of 50 ns.
The AD8021 is stable over temperature with low input offset
voltage drift and input bias current drift, 0.5 μV/°C and 10 nA/°C,
respectively. The AD8021 is also capable of driving a 75 Ω line
with ±3 V video signals.
www.DataSheet4U.com
The AD8021 is both technically superior and priced considerably
APPLICATIONS
ADC preamps and drivers
Instrumentation preamps
Active filters
less than comparable amps drawing much higher quiescent
current. The AD8021 is a high speed, general-purpose amplifier,
ideal for a wide variety of gain configurations and can be used
throughout a signal processing chain and in control loops. The
AD8021 is available in both standard 8-lead SOIC and MSOP
Portable instrumentation
packages in the industrial temperature range of −40°C to +85°C.
Line receivers
Precision instruments
Ultrasound signal processing
High gain circuits
24
VOUT = 50mV p-p
21
GENERAL DESCRIPTION
18
G = –10, RF = 1kΩ, RG = 100Ω,
RIN = 100Ω, CC = 0pF
15
The AD8021 is an exceptionally high performance, high speed
voltage feedback amplifier that can be used in 16-bit resolution
systems. It is designed to have both low voltage and low current
noise (2.1 nV/√Hz typical and 2.1 pA/√Hz typical) while operating
at the lowest quiescent supply current (7 mA @ ±5 V) among
12
G = –5, RF = 1kΩ, RG = 200Ω,
RIN = 66.5Ω, CC = 1.5pF
9
6
G = –2, RF = 499Ω, RG = 249Ω,
3 RIN = 63.4Ω, CC = 4pF
today’s high speed, low noise op amps. The AD8021 operates
over a wide range of supply voltages from ±2.25 V to ±12 V, as
well as from single 5 V supplies, making it ideal for high speed,
low power instruments. An output disable pin allows further
reduction of the quiescent supply current to 1.3 mA.
0
G = –1, RF = 499Ω, RG = 499Ω,
–3 RIN = 56.2Ω, CC = 7pF
–6
0.1M
1M 10M
FREQUENCY (Hz)
100M
Figure 2. Small Signal Frequency Response
1G
Rev. F
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.
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
©2006 Analog Devices, Inc. All rights reserved.


AD8021 데이터시트, 핀배열, 회로
AD8021
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Connection Diagram ....................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 7
Maximum Power Dissipation ..................................................... 7
ESD Caution.................................................................................. 7
Pin Configuration and Function Descriptions............................. 8
Typical Performance Characteristics ............................................. 9
Test Circuits................................................................................. 17
REVISION HISTORY
5/06—Rev. E to Rev. F
Updated Format..................................................................Universal
Changes to General Description .................................................... 1
Changes to Figure 3.......................................................................... 7
Changes to Figure 60...................................................................... 19
Changes to Table 9.......................................................................... 23
3/05—Rev. D to Rev. E
Updated Format..................................................................Universal
Change to Figure 19 ....................................................................... 11
Change to Figure 25 ....................................................................... 12
Change to Table 7 and Table 8 ...................................................... 22
Change to Driving 16-Bit ADCs Section .................................... 22
10/03—Rev. C to Rev. D
Updated Format..................................................................Universal
Applications..................................................................................... 19
Using the Disable Feature.......................................................... 20
Theory of Operation ...................................................................... 21
PCB Layout Considerations...................................................... 21
Driving 16-Bit ADCs ................................................................. 22
Differential Driver...................................................................... 22
Using the AD8021 in Active Filters ......................................... 23
Driving Capacitive Loads.......................................................... 23
Outline Dimensions ....................................................................... 25
Ordering Guide .......................................................................... 25
7/03—Rev. B to Rev. C
Deleted All References to Evaluation Board...................Universal
Replaced Figure 2 ..............................................................................5
Updated Outline Dimensions....................................................... 20
2/03—Rev. A to Rev. B
Edits to Evaluation Board Applications....................................... 20
Edits to Figure 17 ........................................................................... 20
6/02—Rev. 0 to Rev. A
Edits to Specifications .......................................................................2
Rev. F | Page 2 of 28




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