ADA4897-2 Datasheet PDF - Analog Devices

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ADA4897-2
Analog Devices

Part Number ADA4897-2
Description Rail-to-Rail Output Amplifiers
Page 29 Pages

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Data Sheet
1 nV/√Hz, Low Power,
Rail-to-Rail Output Amplifiers
ADA4896-2/ADA4897-1/ADA4897-2
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 DISABLE
7 +VS
6 OUT
5 NC
Figure 1. 8-Lead SOIC (ADA4897-1)
8 VS = ±5V
7
6
5
4
3
2
1
0
1 10 100 1k 10k 100k 1M 5M
FREQUENCY (Hz)
Figure 2. Voltage Noise vs. Frequency
Table 1. Other Low Noise Amplifiers
VN (nV/√Hz)
Part No.
At 1 kHz At 100 kHz BW (MHz)
AD797
0.9
0.9
8
AD8021
5
2.1 490
AD8099
3
0.95 510
AD8045
6
3
1000
ADA4899-1 1.4
1
600
ADA4898-1/ 0.9
ADA4898-2
0.9
65
Supply
Voltage (V)
10 to 30
5 to 24
5 to 12
3.3 to 12
5 to 12
10 to 32
Table 2. Complementary ADCs
Part No.
Bits
Speed (MSPS)
AD7944
14
2.5
AD7985
16
2.5
AD7986
18
2
Power (mW)
15.5
15.5
15
Rev. B
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.
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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.

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