ADA4896-2 Datasheet, PDF (1/28 Pages) Analog Devices – 1 nV/√Hz, Low Power, Rail-to-Rail Output Amplifiers

FEATURES
Low wideband noise
1 nV/√Hz
2.8 pA/√Hz
Low 1/f noise
2.4 nV/√Hz @ 10 Hz
Low distortion: −115 dBc @ 100 kHz, VOUT = 2 V p-p
Low power: 3 mA/amp
Low input offset voltage: 0.5 mV maximum
High speed
230 MHz, −3 dB bandwidth (G = +1)
120 V/μs slew rate
45 ns settling time to 0.1%
Rail-to-rail output
Wide supply range: 3 V to 10 V
Disable feature (ADA4897-1)
APPLICATIONS
Low noise preamplifier
Ultrasound amplifiers
PLL loop filters
High performance ADC drivers
DAC buffers
GENERAL DESCRIPTION
The ADA4896-2/ADA4897-1 are unity gain stable, low noise,
rail-to-rail output, high speed voltage feedback amplifiers
that have a quiescent current of 3 mA. With the 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 are an ideal
solution 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.
TheADA4896-2/ADA4897-1 have 230 MHz bandwidth,
120 V/μs slew rate, and settle to 0.1% in 45 ns. With a wide
supply voltage range (3 V to 10 V), the ADA4896-2/ADA4897-1
are ideal candidates for systems that require high dynamic
range, precision, 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. Both the ADA4896-2 and ADA4897-1
work over the extended industrial temperature range of −40°C
to +125°C.
1 nV/√Hz, Low Power,
Rail-to-Rail Output Amplifiers
ADA4896-2/ADA4897-1
FUNCTIONAL BLOCK DIAGRAM
NC 1
–IN 2
+IN 3
–V_S 4
8 DISABLE
7 +V_S
6 OUT
5 NC
Figure 1. 8-Lead SOIC (ADA4897-1)
8
V_S = ±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) VN (nV/√Hz)
Part Number @ 1 kHz
@ 100 kHz
AD797
0.9
0.9
AD8021
5
2.1
AD8099
7
0.95
AD8045
6
3
ADA4899-1 1.4
1
ADA4898-1/ 0.9
0.9
ADA4898-2
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 Number Bits
Speed (MSPS)
AD7944
14
2.5
AD7985
16
2.5
AD7986
18
2
Power (mW)
15.5
15.5
15
Rev. 0
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