JFET Input Instrumentation Amplifier with
Rail-to-Rail Output in MSOP Package
AD8220-EP
Enhanced Product
FEATURES
PIN CONFIGURATION
Low input currents
AD8220-EP
1
2
3
4
8
7
6
5
–IN
+V
S
25 pA maximum input bias current
2 pA maximum input offset current
High CMRR
92 dB CMRR (minimum) to 60 Hz, G = 10
72 dB CMRR (minimum) at 5 kHz, G = 1
Excellent ac specifications and low power
1.5 MHz bandwidth (G = 1)
14 nV/√Hz input noise (1 kHz)
Slew rate: 2 V/µs
1 mA maximum quiescent supply current
Versatile
MSOP package
Rail-to-rail output
Input voltage range to below negative supply rail
7 kV ESD HBM protection
R
R
V
OUT
G
G
REF
+IN
–V
S
Figure 1.
10000
1000
100
10
I
BIAS
I
OS
1
4.5 V to 36 V single supply
2.25 V to 18 V dual supply
Gain set with single resistor (G = 1 to 1000)
0.1
ENHANCED PRODUCT FEATURES
Supports defense and aerospace applications (AQEC standard)
Extended industrial temperature range: −55°C to +125°C
Controlled manufacturing baseline
1 assembly/test site
0.01
–75
–25
25
75
125
TEMPERATURE (°C)
Figure 2. Input Bias Current and Offset Current vs. Temperature
1 fabrication site
Product change notification
Qualification data available on request
can operate on a 18 V dual supply, as well as on a single 5 V
supply. Its rail-to-rail output stage maximizes dynamic range on
the low voltage supplies common in portable applications. Its
ability to run on a single 5 V supply eliminates the need to use
higher voltage, dual supplies. The AD8220-EP draws a maximum
of 750 µA of quiescent current at 25°C, making it ideal for battery
powered devices.
APPLICATIONS
Medical instrumentation
Precision data acquisition
Transducer interfaces
GENERAL DESCRIPTION
The AD8220-EP is the first single-supply, JFET input instrumenta-
tion amplifier available in an MSOP package. Designed to meet
the needs of high performance, portable instrumentation, the
AD8220-EP has a minimum common-mode rejection ratio
(CMRR) of 77 dB at dc and a minimum CMRR of 72 dB at 5 kHz
for G = 1. Maximum input bias current at 25°C is 25 pA and
remains below 100 nA over the entire extended industrial
temperature range. Despite the JFET inputs, the AD8220-EP
typically has a noise corner of only 10 Hz.
Gain is set from 1 to 1000 with a single resistor. Increasing the
gain increases the common-mode rejection. Measurements that
need higher CMRR when reading small signals benefit when
the AD8220-EP is set for large gains.
A reference pin allows the user to offset the output voltage. This
feature is useful when interfacing with analog-to-digital converters.
The AD8220-EP is available in an MSOP that takes roughly half
the board area of an SOIC. Performance is specified over the
extended industrial temperature range of −55°C to +125°C.
With the proliferation of mixed-signal processing, the number
of power supplies required in each system has grown. The
AD8220-EP is designed to alleviate this problem. The AD8220-EP
Additional application and technical information can be found
in the AD8220 data sheet.
Rev. A
Document Feedback
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
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
Technical Support
©2017 Analog Devices, Inc. All rights reserved.
www.analog.com