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PDF AD8021 Data sheet ( Hoja de datos )
| Número de pieza | AD8021 | |
| Descripción | High Speed Amplifier | |
| Fabricantes | Analog Devices | |
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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.
1 page  
AD8021
Parameter
OUTPUT CHARACTERISTICS
Output Voltage Swing
Linear Output Current
Short-Circuit Current
Capacitive Load Drive for 30% Overshoot
DISABLE CHARACTERISTICS
Off Isolation
Turn-On Time
Turn-Off Time
DISABLE Voltage—Off/On
Enabled Leakage Current
Disabled Leakage Current
POWER SUPPLY
Operating Range
Quiescent Current
+Power Supply Rejection Ratio
−Power Supply Rejection Ratio
Conditions
VO = 50 mV p-p/1 V p-p
f = 10 MHz
VO = 0 V to 2 V, 50% logic to 50% output
VO = 0 V to 2 V, 50% logic to 50% output
V − VDISABLE LOGIC REFERENCE
LOGIC REFERENCE = 0.4 V
DISABLE = 4.0 V
LOGIC REFERENCE = 0.4 V
DISABLE = 0.4 V
Output enabled
Output disabled
VCC = 11 V to 13 V, VEE = −12 V
VCC = 12 V, VEE = −13 V to −11 V
AD8021AR/AD8021ARM
Min Typ
Max Unit
−10.2 to +9.8
−10.6 to +10.2
70
115
15/120
V
mA
mA
pF
−40
45
50
1.80/1.95
70
2
30
33
dB
ns
ns
V
μA
μA
μA
μA
±2.25
−86
−86
±5
7.8
1.7
−96
−100
±12.0
8.6
2.0
V
mA
mA
dB
dB
VS = 5 V, @ TA = 25°C, RL = 1 kΩ, gain = +2, unless otherwise noted.
Table 3.
Parameter
DYNAMIC PERFORMANCE
−3 dB Small Signal Bandwidth
Slew Rate, 1 V Step
Settling Time to 0.01%
Overload Recovery (50%)
DISTORTION/NOISE PERFORMANCE
f = 1 MHz
HD2
HD3
f = 5 MHz
HD2
HD3
Input Voltage Noise
Input Current Noise
Conditions
G = +1, CC = 10 pF, VO = 0.05 V p-p
G = +2, CC = 7 pF, VO = 0.05 V p-p
G = +5, CC = 2 pF, VO = 0.05 V p-p
G = +10, CC = 0 pF, VO = 0.05 V p-p
G = +1, CC = 10 pF
G = +2, CC = 7 pF
G = +5, CC = 2 pF
G = +10, CC = 0 pF
VO = 1 V step, RL = 500 Ω
0 V to 2.5 V input step, G = +2
VO = 2 V p-p
VO = 2 V p-p
VO = 2 V p-p
VO = 2 V p-p
f = 50 kHz
f = 50 kHz
AD8021AR/AD8021ARM
Min Typ Max Unit
270 305
155 190
135 165
95 130
80 110
110 140
210 280
290 390
28
40
MHz
MHz
MHz
MHz
V/μs
V/μs
V/μs
V/μs
ns
ns
−84 dBc
−91 dBc
−68 dBc
−81 dBc
2.1 2.6 nV/√Hz
2.1 pA/√Hz
Rev. F | Page 5 of 28
5 Page 
6.4
G = +2
6.2
VS = ±2.5V
6.0
5.8
VS = ±5V
VS = ±12V
5.6
5.4
1M
10M
FREQUENCY (Hz)
100M
Figure 17. 0.1 dB Flatness vs. Frequency and Supply, VOUT = 1 V p-p,
RL = 150 Ω, Noninverting (See Figure 49)
–20
–30
–40
–50
–60
–70
–80 RL = 100Ω
–90
–100
–110
–120
–130
0.1M
SECOND
RL = 1kΩ
THIRD
1M
FREQUENCY (Hz)
10M 20M
Figure 18. Second and Third Harmonic Distortion vs. Frequency and RL
–30
–40
–50
–60
–70 THIRD SECOND
–80 VS = ±2.5V
–90
–100
–110
SECOND
VS = ±5V
–120 THIRD
SECOND VS = ±12V
–130
100k
1M
FREQUENCY (Hz)
10M 20M
Figure 19. Second and Third Harmonic Distortion vs. Frequency and VS
AD8021
–20
–30
–40
–50
Δf = 0.2MHz
–60
–70
–80
f1
f2
POUT
976Ω
53.6Ω
50Ω
–90
–100
–110
–120
9.5
9.7 10.0 10.3 10.5
FREQUENCY (MHz)
Figure 20. Intermodulation Distortion vs. Frequency
50
45
40
VS = ±5V
35
VS = ±2.5V
30
25
20
0 5 10 15 20
FREQUENCY (MHz)
Figure 21. Third-Order Intercept vs. Frequency and Supply Voltage
–50
–60
–70
SECOND
–80 RL = 100Ω
–90
SECOND
THIRD
–100
RL = 1kΩ
–110
THIRD
–120
12 3 4 56
VOUT (V p-p)
Figure 22. Second and Third Harmonic Distortion vs. VOUT and RL
Rev. F | Page 11 of 28
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet AD8021.PDF ] | |
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