Low Power, 1 nV/√Hz, G ≥ 10 Stable, Rail-
to-Rail Output Amplifier
Data Sheet
ADA4895-1/ADA4895-2
FEATURES
FUNCTIONAL BLOCK DIAGRAMS
Low wideband noise
1 nV/√Hz
1.6 pA/√Hz
NC
–IN
+IN
1
2
3
4
8
7
6
5
DISABLE
+V
S
OUT
NC
–V
S
ADA4895-1
Low 1/f noise: 2 nV/√Hz at 10 Hz
Low distortion (SFDR): −96 dBc at 100 kHz, VOUT = 2 V p-p
Low power: 3 mA per amplifier
Low input offset voltage: 350 µV maximum
High speed
236 MHz, −3 dB bandwidth (G = +10)
943 V/µs slew rate
22 ns settling time to 0.1%
Rail-to-rail output
NC = NO CONNECT. DO NOT
CONNECT TO THIS PIN.
Figure 1. ADA4895-1 Single Amplifier (8-Lead SOIC)
OUT1
–IN1
+IN1
1
2
3
4
5
10 +V
S
9
8
7
6
OUT2
–IN2
–V
+IN2
S
ADA4895-2
DISABLE1
DISABLE2
Wide supply range: 3 V to 10 V
Disable feature
Figure 2. ADA4895-2 Dual Amplifier (10-Lead MSOP)
30
24
18
12
6
5
4
3
2
1
0
APPLICATIONS
Low noise preamplifier
Ultrasound amplifiers
PLL loop filters
High performance analog-to-digital converter (ADC) drivers
Digital-to-analog converter (DAC) buffers
GENERAL DESCRIPTION
VOLTAGE
CURRENT
The ADA4895-1 (single) and ADA4895-2 (dual) are high speed
voltage feedback amplifiers that are gain ≥ 10 stable with low
input noise, rail-to-rail output, and a quiescent current of 3 mA per
amplifier. With a 1/f noise of 2 nV/√Hz at 10 Hz and a spurious-
free dynamic range (SFDR) of −72 dBc at 2 MHz, the ADA4895-1/
ADA4895-2 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
enables the high performance of these amplifiers.
0
1
10
100
1k
10k
100k
1M
FREQUENCY (Hz)
Figure 3. Input Voltage and Current Noise vs. Frequency
Table 1. Other Low Noise Amplifiers1
ven
at 100 kHz Bandwidth Supply
Part Number(s)
AD8021
(nV/√Hz)
(MHz)
490
1000
510
80
230
230
65
Voltage (V)
2.1
3
0.95
5 to 24
3.3 to 12
5 to 12
2.7 to 12
3 to 10
3 to 10
AD8045
AD8099
The ADA4895-1/ADA4895-2 have a small signal bandwidth of
236 MHz at a gain of +10 with a slew rate of 943 V/µs, and settle
to 0.1% in 22 ns. The wide supply voltage range (3 V to 10 V)
of the ADA4895-1/ADA4895-2 make these amplifiers ideal
candidates for systems that require large dynamic range, high
gain, precision, and high speed.
ADA4841-1/ADA4841-2 2.1
ADA4896-2
1
1
ADA4897-1/ADA4897-2
ADA4898-1/ADA4898-2 0.9
ADA4899-1
10 to 32
5 to 12
1
600
1 See www.analog.com for the latest selection of low noise amplifiers.
The ADA4895-1 is available in 8-lead SOIC and 6-lead SOT-23
packages, and the ADA4895-2 is available in a 10-lead MSOP
package. All packages operate over the extended industrial
temperature range of −40°C to +125°C.
COMPANION PRODUCTS
ADCs: AD7944 (14-bit), AD7985 (16-bit), AD7986 (18-bit)
Additional companion products on the ADA4895-1/ADA4895-2
product page
Rev. B
Document Feedback
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rightsof third parties that may result fromits use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks andregisteredtrademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2012–2015 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
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