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PDF ( 数据手册 , 数据表 ) AD8021

零件编号 AD8021
描述 High Speed Amplifier
制造商 Analog Devices
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AD8021 数据手册, 描述, 功能
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.
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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 pdf, 数据表
AD8021
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
LOGIC
REFERENCE
1
–IN 2
+IN 3
–VS 4
AD8021
8 DISABLE
7 +VS
6 VOUT
5 CCOMP
Figure 4. Pin Configuration
Table 5. Pin Function Descriptions
Pin No. Mnemonic
1 LOGIC REFERENCE
2 −IN
3 +IN
4 −VS
5 CCOMP
6 VOUT
7 +VS
8 DISABLE
Description
Reference for Pin 81 Voltage Level. Connect to logic low supply.
Inverting Input.
Noninverting Input.
Negative Supply Voltage.
Compensation Capacitor. Tie to −VS. (See the Applications section for value.)
Output.
Positive Supply Voltage.
Disable, Active Low.
1 When Pin 8 (DISABLE) is higher than Pin 1 (LOGIC REFERENCE) by approximately 2 V or more, the part is enabled. When Pin 8 is brought down to within about 1.5 V of
Pin 1, the part is disabled. (See the Specifications tables for exact disable and enable voltage levels.) If the disable feature is not going to be used, Pin 8 can be tied to
+VS or a logic high source, and Pin 1 can be tied to ground or logic low. Alternatively, if Pin 1 and Pin 8 are not connected, the part is in an enabled state.
Rev. F | Page 8 of 28







AD8021 equivalent, schematic
AD8021
8.5
8.0
7.5
7.0
6.5
6.0
5.5
–50
–25
0 25 50
TEMPERATURE (°C)
75 100
Figure 47. Quiescent Supply Current vs. Temperature
Rev. F | Page 16 of 28










页数 28 页
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