Highest Accuracy Isolated Sigma-Delta Modulator Increases Efficiency of Motor Drives and Power Inverters
22 Mai 2014 - 3:00PM
Business Wire
AD7403 isolated sigma-delta modulator achieves
industry’s highest accuracy current and voltage measurement.
Analog Devices, Inc. (NASDAQ: ADI) introduced today the
industry’s highest accuracy isolated sigma-delta modulator for
precision current and voltage measurement in DC/AC power conversion
applications. The AD7403 isolated sigma-delta modulator achieves an
81-dB signal-to-noise and distortion ratio (SINAD) (min) @ 78 KSPS
over a -40C° to +125C° temperature range, which is 11 dB higher
than competing devices. The higher SINAD enables more accurate
current and voltage measurement which improves the performance of
motor drives by reducing torque ripple on the motor shaft. The
higher SINAD also increases the power transfer efficiency in DC/AC
power inverter applications, such as motor drives, solar and wind
inverters.
Learn more about ADI’s motor and power
control
solutions:http://motorcontrol.analog.com/en/segment/mc.html
- Connect with ADI engineers on
EngineerZone™, an online technical support
community:http://ez.analog.com/community/power
AD7403 Sigma-Delta Modulator Integrates ADI’s iCoupler®
Digital Isolation Technology
The AD7403 isolated sigma-delta modulator integrates ADI’s
iCoupler® digital isolation technology, creating a single-chip
solution for measuring the voltage across a shunt resistor by
converting an analog signal into a 1-bit data stream that can be
clocked at up to 20 MHz. The increased isolation working voltage
(1250 V peak) allows designers to replace less accurate, more
costly Hall Effect sensors in higher DC-bus voltage power
conversion and motor drive applications.
The higher performance of the isolated sigma-delta modulator
enables the use of a smaller shunt resistor, which reduces thermal
loss across the shunt while retaining measurement accuracy.
AD7403 Isolated Sigma-Delta Modulator Key Features
- 5-MHz to 20-MHz external clock input
rate
- 16 bits, no missing codes
- Typical offset drift: 1.5 μV/°C
- On-board digital isolator
- On-board reference
- True bipolar analog input range: ±320
mV
- High common-mode transient immunity:
>25 kV/μs
Pricing and Availability
Product Volume Availability
Price Each per 10,000
Package
AD7403
Now $2.95 16-lead, wide body SOIC
(8.3mm creepage and clearance)
The AD7403 modulator is well suited to work with other ADI
products designed for motor control and power conversion systems,
including the ADSP-CM40x mixed-signal control processor, ADuM6000
isolated, 5-kV, DC/DC converter and the ADP2441 36-V, 1-A
synchronous step-down DC/DC regulator.
About Analog Devices
Innovation, performance, and excellence are the cultural pillars
on which Analog Devices has built one of the longest standing,
highest growth companies within the technology sector. Acknowledged
industry-wide as the world leader in data conversion and signal
conditioning technology, Analog Devices serves over 60,000
customers, representing virtually all types of electronic
equipment. Analog Devices is headquartered in Norwood,
Massachusetts, with design and manufacturing facilities throughout
the world. Analog Devices is included in the S&P 500 Index.
http://www.analog.com
iCoupler is a registered trademark and EngineerZone is a
trademark of Analog Devices, Inc. All other trademarks are the
property of their respective owners.
Follow ADI on Twitter at http://www.twitter.com/ADI_News
To subscribe to Analog Dialogue, ADI’s monthly technical
journal, visit: http://www.analog.com/library/analogDialogue/
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Analog Devices, Inc.Grainne Murphy, Tel: +353
61-495540grainne.murphy@analog.comorPorter
NovelliAndrew MacLellan, Tel :
617-897-8270andrew.maclellan@porternovelli.com
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