ADA4896-2/ADA4897-1/ADA4897-2: 1 nV/?Hz, Low Power, Rail-to-Rail Output Amplifiers0 pages

FEATURES

Low noise preamplifier
Ultrasound amplifiers
PLL loop filters
High performance ADC drivers
DAC buffers

NC 1

8

DISABLE

–IN 2

7

+VS

+IN 3

6

OUT

–VS 4

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

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.

09447-102

APPLICATIONS

FUNCTIONAL BLOCK DIAGRAM

VOLTAGE NOISE (nV/√Hz)

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)

09447-101

Data Sheet

1 nV/√Hz, Low Power,
Rail-to-Rail Output Amplifiers
ADA4896-2/ADA4897-1/ADA4897-2

Table 1. Other Low Noise Amplifiers
Part No.
AD797
AD8021
AD8099
AD8045
ADA4899-1
ADA4898-1/
ADA4898-2

VN (nV/√Hz)
At 1 kHz
At 100 kHz
0.9
0.9
5
2.1
3
0.95
6
3
1.4
1
0.9
0.9

BW (MHz)
8
490
510
1000
600
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.
AD7944
AD7985
AD7986

Bits
14
16
18

Speed (MSPS)
2.5
2.5
2

Power (mW)
15.5
15.5
15

Rev. B
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