Electrometer-Grade Amplifier Improves Accuracy While Reducing Size of Chemical Analysis Instruments
27 Outubro 2015 - 10:00AM
Business Wire
Analog Devices, Inc. today introduced an electrometer-grade
operational amplifier that enables chemical analysis instruments to
achieve the highest level of precision and data repeatability over
a wider temperature range in a compact solution that reduces
overall bill of materials and design footprint. The ADA4530-1 op
amp achieves this with an input bias current that is at least 20
times lower than competing devices. Such low bias current makes the
ADA4530-1 ideal for interfacing to sensors that are sensitive to
output loading such as photo diodes and other high output impedance
sensors often used in precision monitoring/analysis equipment such
as spectrophotometers, chromatographs and mass spectrometers, as
well as potentiostatic and amperostatic coulometry measurement
devices. The new amp also can be used as a front-end amplifier for
picoammeter and coulombmeter instrumentation systems, as a
transimpedance amplifier for photodiodes, ion chambers, and working
electrode measurements, or as a high-impedance buffer for chemical
and capacitive sensors.
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- Download the data sheet, view product
page and order samples or evaluation
boards:http://www.analog.com/ADA4530-1
- Get questions answered by ADI engineers
on EngineerZone®, ADI’s online technical support community:
https://ez.analog.com/community/amplifiers
- Watch the ADA4350-1 video:
http://www.analog.com/ADA4530-1
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The ADA4530-1 op amp’s input bias current is 250 fA at 125°C,
which is 20 times lower than competitive amplifiers, and drops to
20 fA at 85°C, which is 50 times lower than competing devices.
Additionally, the ADA4530-1 is the only op amp able to specify the
same input bias current of 20 fA from room temperature to 85°C and
is the only amp in its class to be fully production tested for bias
current at room temperature and 125°C. The closest competing op
amps are rarely specified at 125°C and none are production tested
at room temperature for the bias current, which prevents system
designers from taking full advantage of the sensitivity of their
sensors, because they need to leave some guard band for a wider
variation of the bias current.
The ADA4530-1 also incorporates an on-chip guard buffer that
tracks the input common-mode voltage and provides an output that is
useful for driving PCB guard rings or the guard shield of
interconnecting shielding used to reduce the effects of stray
capacitance on the sensitive connections between the sensor and the
amplifier. This simplifies sensor interface design by removing the
need for the customer to design a separate circuit to provide the
required output drive, thus reducing design time, cost, and PCB
space.
ADA4530-1 Electrometer-Grade Operational Amplifier Key
Features
- Ultra-low bias current
- 20 fA @ 25°C max (Production
Tested)
- 20 fA @ 85°C max
- 250 fA @ 125°C max (Production
Tested)
- Integrated guard buffer
- Wide supply voltage: ±2.5 to ±8 V or 5
to 16 V
Pricing and Availability
Product
ProductionAvailability
Price Each In1,000
Quantities
Packaging ADA4530-1 NOW
$11.40 8-lead SOIC
About Analog Devices
Analog Devices designs and manufactures semiconductor products
and solutions. We enable our customers to interpret the world
around us by intelligently bridging the physical and digital with
unmatched technologies that sense, measure and connect. Visit
http://www.analog.com/.
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version on businesswire.com: http://www.businesswire.com/news/home/20151027005040/en/
Analog Devices, Inc.Joe Dussi,
781-937-1216Joe.dussi@analog.comorPorter
NovelliAndrew MacLellan,
617-897-8270andrew.maclellan@porternovelli.com
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