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