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AD8224 Datasheet(PDF) 1 Page - Analog Devices

Part No. AD8224
Description  Precision, Dual-Channel, JFET Input Rail-to-Rail Instrumentation Amplifier
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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Precision, Dual-Channel, JFET Input
Rail-to-Rail Instrumentation Amplifier
Preliminary Technical Data
AD8224
FEATURES
FUNCTIONAL BLOCK DIAGRAM
Two channels in a small 4 mm × 4 mm LFCSP
Low input currents
10 pA maximum input bias current (B grade)
0.6 pA maximum input offset current (B grade)
–IN1
AD8224
1
2
3
4
12
11
10
9
5
6
7
8
13
14
15
16
–IN2
RG2
RG2
+IN2
High CMRR
RG1
100 dB CMRR (minimum), G = 10 (B grade)
RG1
+IN1
80 dB CMRR (minimum) to 5 kHz, G = 1 (B grade)
Excellent ac specifications and low power
1.5 MHz bandwidth (G = 1)
14 nV/√Hz input noise (1 kHz)
Slew rate 2 V/μs
750 μA quiescent supply current per amplifier (maximum)
Figure 1. 4mm × 4 mm LFCSP
Versatility
Rail-to-rail output
Input voltage range to below negative supply rail
Table 1. In Amps and Difference Amplifiers by Category
High
Perform.
Low
Cost
High
Volt.
Mil
Grade
Low
Power
Digital
Gain
AD82201
AD8221
AD8222
AD82241
AD85531
AD6231
AD628
AD629
AD620
AD621
AD524
AD526
AD624
AD6271
AD85551
AD85561
AD85571
4 kV ESD protection
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)
APPLICATIONS
Medical instrumentation
Precision data acquisition
Transducer interface
Differential drive for
High resolution input ADCs
Remote sensors
GENERAL DESCRIPTION
The AD8224 is the first single-supply junction field effect
transistor (JFET) input instrumentation amplifier available in
the space-saving 16-lead, 4 mm×4 mm LFCSP. It requires the
same board area as a typical single instrumentation amplifier,
yet doubles the channel density and offers a lower cost per
channel without compromising performance.
Designed to meet the needs of high performance, portable
instrumentation, the AD8224 has a minimum common-mode
rejection ratio (CMRR) of 86 dB at dc and a minimum CMRR
of 80 dB at 5 kHz for G = 1. Maximum input bias current is
10 pA and typically remains below 300 pA over the entire
industrial temperature range. Despite the JFET inputs, the
AD8224 typically has a noise corner of only 10 Hz.
With the proliferation of mixed-signal processing, the number of
power supplies required in each system has grown.
1 Rail-to-rail output.
Designed to alleviate this problem, the AD8224 can operate on a
±18 V dual supply, as well as on a single +5 V supply. The device’s
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 for higher voltage, dual
supplies. The AD8224 draws a maximum of 750 μA of quiescent
current per amplifier, making it ideal for battery-powered devices.
In addition, the AD8224 can be configured as a single-channel,
differential output instrumentation amplifier. Differential
outputs provide high noise immunity, which can be useful when
the output signal must travel through a noisy environment, such
as with remote sensors. The configuration can also be used to
drive differential input ADCs.
For a single-channel version, use the AD8220 device.
Rev. PrB
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Tel: 781.329.4700
www.analog.com
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
Fax: 781.461.3113
©2006 Analog Devices, Inc. All rights reserved.




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