Low Noise, Low Gain Drift, G = 2000
Instrumentation Amplifier
Data Sheet
AD8428
FEATURES
FUNCTIONAL BLOCK DIAGRAM
+V
–FIL
S
Fixed gain of 2000
Access to internal nodes provides flexibility
Low noise: 1.5 nV/√Hz input voltage noise
High accuracy dc performance
Gain drift: 5 ppm/°C
Offset drift: 0.3 μV/°C
Gain accuracy: 0.05%
–IN
6kΩ
6kΩ
6kΩ
120kΩ
3kΩ
30.15Ω
3kΩ
OUT
REF
6kΩ
120kΩ
CMRR: 140 dB min
+IN
Excellent ac specifications
Bandwidth: 3.5 MHz
AD8428
–V
S
Slew rate: 40 V/μs
+FIL
Power supply range: 4 V to 18 V
8-lead SOIC package
ESD protection: 5000 V (HBM)
Temperature range for specified performance:
−40°C to +85°C
Figure 1.
Table 1. Instrumentation Amplifiers by Category1
General-
Purpose
Zero
Drift
Military
Grade
Low
Power
Low
Noise
AD8220
AD8221
AD8222
AD8224
AD8228
AD8295
AD8231
AD8290
AD8293
AD8553
AD8556
AD8557
AD620
AD621
AD524
AD526
AD624
AD627
AD623
AD8428
AD8429
Operational up to 125°C
APPLICATIONS
AD8235
AD8236
AD8426
AD8226
AD8227
AD8420
Sensor interface
Medical instrumentation
Patient monitoring
1 See www.analog.com for the latest instrumentation amplifiers.
The AD8428 is one of the fastest instrumentation amplifiers
available. The circuit architecture is designed for high bandwidth
at high gain. The AD8428 uses a current feedback topology for
the initial preamplifier gain stage of 200, followed by a difference
amplifier stage of 10. This architecture results in a 3.5 MHz
bandwidth at a gain of 2000 for an equivalent gain bandwidth
product of 7 GHz.
GENERAL DESCRIPTION
The AD8428 is an ultralow noise instrumentation amplifier
designed to accurately measure tiny, high speed signals. It
delivers industry-leading gain accuracy, noise, and bandwidth.
All gain setting resistors for the AD8428 are internal to the part
and are precisely matched. Care is taken in both the chip pinout
and layout. This results in excellent gain drift and quick settling
to the final gain value after the part is powered on.
The AD8428 pinout allows access to internal nodes between the
first and second stages. This feature can be useful for modifying
the frequency response between the two amplification stages,
thereby preventing unwanted signals from contaminating the
output results.
The high CMRR of the AD8428 prevents unwanted signals
from corrupting the signal of interest. The pinout of the AD8428
is designed to avoid parasitic capacitance mismatches that can
degrade CMRR at high frequencies.
The performance of the AD8428 is specified over the industrial
temperature range of −40°C to +85°C. It is available in an 8-lead
plastic SOIC package.
Rev. A
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its 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 and registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©2011–2012 Analog Devices, Inc. All rights reserved.
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