1 nV/√Hz, Low Power,
Rail-to-Rail Output Amplifiers
Enhanced Product
ADA4897-1-EP/ADA4897-2-EP
Rev. 0 Document Feedback
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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, V
OUT
= 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
ENHANCED PRODUCT FEATURES
Supports defense and aerospace applications (AQEC standard)
Extended industrial temperature range (−55°C to +125°C)
Controlled manufacturing baseline
1 assembly/test site
1 fabrication site
Enhanced product change notification
Qualification data available on request
APPLICATIONS
Low noise preamplifier
Ultrasound amplifiers
PLL loop filters
High performance ADC drivers
DAC buffers
GENERAL DESCRIPTION
The ADA4897-1-EP/ADA4897-2-EP 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, these amplifiers 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 ADA4897-1-EP/ADA4897-2-EP 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 ADA4897-1-EP/
ADA4897-2-EP are ideal candidates for systems that require
high dynamic range, precision, low power, and high speed.
The ADA4897-1-EP is available in 6-lead SOT-23 package and
the ADA4897-2-EP is available in a 10-lead MSOP package. The
ADA4897-1-EP/ADA4897-2-EP operate over the extended
industrial temperature range of −55°C to +125°C. Additional
application and technical information can be found in the
ADA4897-1/ADA4897-2 data sheet.
FUNCTIONAL BLOCK DIAGRAM
DA4897-1-EP
OUT
1
–V
S
2
+IN
3
+V
S
6
5
–IN
4
DISABLE
09448-101
Figure 1. 6-Lead SOT-23 (ADA4897-1-EP)
0
1
2
3
4
5
6
7
8
FREQUENCY (Hz)
1 10 100 1k 10k 100k 1M 5M
VOLTAGE NOISE (nV/√Hz)
V
S
= ±5V
09448-102
Figure 2. Voltage Noise vs. Frequency
Table 1. Other Low Noise Amplifiers
V
N
(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
