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PDF ( 数据手册 , 数据表 ) AD8008

零件编号 AD8008
描述 High Speed Amplifiers
制造商 Analog Devices
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AD8008 数据手册, 描述, 功能
FEATURES
Extremely low distortion
Second harmonic
−88 dBc @ 5 MHz
−83 dBc @ 20 MHz (AD8007)
−77 dBc @ 20 MHz (AD8008)
Third harmonic
−101 dBc @ 5 MHz
−92 dBc @ 20 MHz (AD8007)
−98 dBc @ 20 MHz (AD8008)
High speed
650 MHz, −3 dB bandwidth (G = +1)
1000 V/μs slew rate
Low noise
2.7 nV/√Hz input voltage noise
22.5 pA/√Hz input inverting current noise
Low power: 9 mA/amplifier typical supply current
Wide supply voltage range: 5 V to 12 V
0.5 mV typical input offset voltage
Small packaging: 8-lead SOIC, 8-lead MSOP, and 5-lead SC70
APPLICATIONS
Instrumentation
IF and baseband amplifiers
Filters
A/D drivers
DAC buffers
GENERAL DESCRIPTION
The AD8007 (single) and AD8008 (dual) are high performance
current feedback amplifiers with ultralow distortion and noise.
Unlike other high performance amplifiers, the low price and
low quiescent current allow these amplifiers to be used in a
wide range of applications. Analog Devices, Inc., proprietary
second-generation eXtra-Fast Complementary Bipolar (XFCB)
process enables such high performance amplifiers with low power
consumption.
The AD8007/AD8008 have 650 MHz bandwidth, 2.7 nV/√Hz
voltage noise, −83 dB SFDR at 20 MHz (AD8007), and −77 dBc
SFDR at 20 MHz (AD8008).
With the wide supply voltage range (5 V to 12 V) and wide
bandwidth, the AD8007/AD8008 are designed to work in a
variety of applications. The AD8007/AD8008 amplifiers have
a low power supply current of 9 mA/amplifier.
Rev. E
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.
Ultralow Distortion,
High Speed Amplifiers
AD8007/AD8008
CONNECTION DIAGRAMS
AD8007
NC 1 (Top View) 8 NC
–IN 2
+IN 3
–VS 4
7 +VS
6 VOUT
5 NC
NC = NO CONNECT
Figure 1. 8-Lead SOIC (R)
AD8007
VOUT 1 (Top View) 5 +VS
–VS 2
+IN 3
4 –IN
Figure 2. 5-Lead SC70 (KS)
VOUT1 1
–IN1 2
AD8008
(Top View)
8 +VS
7 VOUT2
+IN1 3
6 –IN2
–VS 4
5 +IN2
Figure 3. 8-Lead SOIC (R) and 8-Lead MSOP (RM)
The AD8007 is available in a tiny SC70 package as well as a
standard 8-lead SOIC. The dual AD8008 is available in both an
8-lead SOIC and an 8-lead MSOP. These amplifiers are rated to
work over the industrial temperature range of −40°C to +85°C.
–30
G = +2
–40
RL = 150
VS = ±5V
VOUT = 2V p-p
–50
–60
–70
SECOND
–80
–90
–100
THIRD
–110
1
10
FREQUENCY (MHz)
100
Figure 4. AD8007 Second and Third Harmonic Distortion vs. Frequency
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 ©2002–2009 Analog Devices, Inc. All rights reserved.







AD8008 pdf, 数据表
AD8007/AD8008
10
G = +2
9
8
7
6
20pF
20pF AND
20SNUB
20pF AND
10SNUB
5
4 499
499
3
200
2
49.9
1
RSNUB
CLOAD
0pF
0
1 10 100 1000
FREQUENCY (MHz)
Figure 12. Small Signal Frequency Response for
Capacitive Load and Snub Resistor
3
G = +1
2
1
VS = +5V, +85°C
VS = ±5V, +85°C
0
–1
–2 VS = +5V, –40°C
–3 VS = ±5V, –40°C
–4
–5
–6
–7
10
100
FREQUENCY (MHz)
1000
Figure 13. Small Signal Frequency Response over Temperature,
VS = +5 V, VS = ±5 V
3
VOUT = 2V p-p
2
1
G = +1 G = +2
0
–1
–2 G = +10
G = –1
–3
–4
–5
–6
–7
1
10 100
FREQUENCY (MHz)
1000
Figure 14. Large Signal Frequency Response for Various Gains
10M
90
1M
100k
10k
TRANSIMPEDANCE
PHASE
30
0
–30
–90
1k –150
–180
100 –210
10 –270
1 –330
10k
100k
1M
10M 100M
1G 2G
FREQUENCY (Hz)
Figure 15. Transimpedance and Phase vs. Frequency
9
G = +2
8
7 VS = +5V, +85°C
6
5 VS = ±5V, +85°C
4 VS = +5V, –40°C
3 VS = ±5V, –40°C
2
1
0
–1
10
100
FREQUENCY (MHz)
1000
Figure 16. Small Signal Frequency Response over Temperature,
VS = +5 V, VS = ±5 V
9
G = +2
8
7
6
5
4
RL = 150, VS = ±5V, VO = 2V p-p
3
2 RL = 1k, VS = ±5V, VO = 2V p-p
1 RL = 150, VS = +5V, VO = 1V p-p
0 RL = 1k, VS = +5V, VO = 1V p-p
–1
10
100
FREQUENCY (MHz)
1000
Figure 17. Large Signal Frequency Response for VS and RL
Rev. E | Page 8 of 20







AD8008 equivalent, schematic
AD8007/AD8008
Whenever physical layout considerations prevent the decoupling
scheme shown in Figure 53, the user can connect one of the
high frequency decoupling capacitors directly across the supplies
and connect the other high frequency decoupling capacitor to
ground (see Figure 54).
RF
499
RG
499
+VS
C1
0.1µF
+10µF
RS AD8007
200
IN C2
0.1µF
–VS
10µF +
OUT
Figure 54. High Frequency Capacitors Connected Across the Supplies
(Recommended)
LAYOUT CONSIDERATIONS
The standard noninverting configuration with recommended
power supply bypassing is shown in Figure 54. The 0.1 μF high
frequency decoupling capacitors should be X7R or NPO chip
components. Connect C2 from the +VS pin to the −VS pin.
Connect C1 from the +VS pin to signal ground.
The length of the high frequency bypass capacitor leads is critical.
Parasitic inductance due to long leads works against the low
impedance created by the bypass capacitor. The ground for the
load impedance should be at the same physical location as the
bypass capacitor grounds. For larger value capacitors, which are
intended to be effective at lower frequencies, the current return
path distance is less critical.
Rev. E | Page 16 of 20










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