ADA4895-1 Datasheet, PDF (1/24 Pages) Analog Devices – Low Power, 1 nV/√Hz, G ≥ 10 Stable, Railto- Rail Output Amplifier

Data Sheet
Low Power, 1 nV/√Hz, G ≥ 10 Stable, Rail-
to-Rail Output Amplifier
ADA4895-1/ADA4895-2
FEATURES
Low wideband noise
1 nV/√Hz
1.6 pA/√Hz
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
Wide supply range: 3 V to 10 V
Disable feature
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
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.
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.
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.
Rev. B
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FUNCTIONAL BLOCK DIAGRAMS
NC 1
8 DISABLE
–IN 2
+IN 3
7 +V_S
6 OUT
–V_S 4 _ADA4895-1 5 NC
NC = NO CONNECT. DO NOT
CONNECT TO THIS PIN.
Figure 1. ADA4895-1 Single Amplifier (8-Lead SOIC)
OUT1 1
–IN1 2
+IN1 3
–V_S 4
DISABLE1 5
10 +V_S
9 OUT2
8 –IN2
7 +IN2
ADA4895-2 6 DISABLE2
Figure 2. ADA4895-2 Dual Amplifier (10-Lead MSOP)
5
30
4
24
3
18
2
12
VOLTAGE
1
6
CURRENT
0
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
Part Number(s)
ven at 100 kHz Bandwidth
(nV/√Hz)
(MHz)
AD8021
2.1
490
AD8045
3
1000
AD8099
0.95
510
ADA4841-1/ADA4841-2 2.1
80
ADA4896-2
1
230
ADA4897-1/ADA4897-2 1
230
ADA4898-1/ADA4898-2 0.9
65
ADA4899-1
1
600
Supply
Voltage (V)
5 to 24
3.3 to 12
5 to 12
2.7 to 12
3 to 10
3 to 10
10 to 32
5 to 12
1 _{See www.analog.com for the latest selection of low noise amplifiers.}
COMPANION PRODUCTS
ADCs: AD7944 (14-bit), AD7985 (16-bit), AD7986 (18-bit)
Additional companion products on the ADA4895-1/ADA4895-2
product page
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