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AD7985 датащи(PDF) 1 Page - Analog Devices

номер детали AD7985
подробное описание детали  1 nV/?숰z, Low Power
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
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1 nV/√Hz, Low Power,
Rail-to-Rail Output Amplifiers
Data Sheet
ADA4896-2/ADA4897-1/ADA4897-2
Rev. B
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.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
©2012 Analog Devices, Inc. All rights reserved.
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, VOUT = 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)
APPLICATIONS
Low noise preamplifier
Ultrasound amplifiers
PLL loop filters
High performance ADC drivers
DAC buffers
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.
FUNCTIONAL BLOCK DIAGRAM
NC 1
–IN 2
+IN 3
–VS 4
8
+VS
7
OUT
6
NC
5
DISABLE
Figure 1. 8-Lead SOIC (ADA4897-1)
0
1
2
3
4
5
6
7
8
FREQUENCY (Hz)
1
10
100
1k
10k
100k
1M
5M
VS = ±5V
Figure 2. Voltage Noise vs. Frequency
Table 1. Other Low Noise Amplifiers
VN (nV/√Hz)
Supply
Part No.
At 1 kHz
At 100 kHz
BW (MHz)
Voltage (V)
AD797
0.9
0.9
8
10 to 30
AD8021
5
2.1
490
5 to 24
AD8099
3
0.95
510
5 to 12
AD8045
6
3
1000
3.3 to 12
ADA4899-1
1.4
1
600
5 to 12
ADA4898-1/
ADA4898-2
0.9
0.9
65
10 to 32
Table 2. Complementary ADCs
Part No.
Bits
Speed (MSPS)
Power (mW)
AD7944
14
2.5
15.5
AD7985
16
2.5
15.5
AD7986
18
2
15


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