Product category:
Analogue and Mixed Signal ICs
News Release from: Analog Devices | Subject: AD7690
Edited by the Electronicstalk Editorial
Team on 03 November 2005
Compact ADC delivers 400ksps data rates
Analog Devices has introduced what it claims is the industry's first 18bit analogue-to-digital convertor (ADC) to deliver 400ksps data rates in a 3 x 5mm mini-small-outline package(MSOP) package.
Analog Devices has introduced what it claims is the industry's first 18bit analogue-to-digital convertor (ADC) to deliver 400ksps data rates in a 3 x 5mm mini-small-outline package(MSOP) package, and also a 3mm x 3mm (lead frame, chip scale package (LFCSP), the world's smallest leadless package Targeted at applications that can take advantage of its unique combination of speed, performance, low power and small package - such as battery operated medical equipment, remote and isolated data acquisition systems and industrial smart sensors, the AD7690 is designed for applications where board space - is at a premium but speed and accuracy cannot be sacrificed
This article was originally published on Electronicstalk on 14 Sep 2001 at 8.00am (UK)
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In addition to doubling speed and enabling a 40% reduction in board space, the AD7690 has an signal-to-noise ratio of 102dB, making the 18bit device 6dB more accurate than the closest competing ADC.
"A wide range of modern day convertors might excel in one dimension, but fall short of meeting the customer needs across all the dimensions that must be balanced for a successful system design".
"For most instrumentation convertors, the compromise has typically been power consumption and size", said Mike Britchfield, Product Line Director of Precision Signal Processing, Analog Devices.
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"We understand that designers of instrumentation applications are facing the same board constraints as portable applications and with our new AD7690, they no longer have to make complex trade-offs to design a system with speed, precision and portability".
In addition to its increased precision, higher speed, and smaller package, the AD7690 consumes 80% less power than competing devices, making it a natural fit for battery-powered portable and handheld instrumentation applications.
At its highest throughput rate of 400ksps, the AD7690 dissipates 20mW, compared with 110mW for the closest competing ADC.
The device powers down automatically at the end of each conversion, so the power scales linearly with the sampling rate, making the part ideal for low-battery powered applications.
The AD7690 is a member of the Analog Devices' Pulsar family of successive approximation ADCs, the most cost-effective technology for applications that require precise digital modelling of analogue signals.
The device's differential linearity of +/-1 LSB (least significant bit) makes it the first ADC to offer true 18bit linearity in an MSOP package with zero data latency.
The AD7690 also achieves a typical integral non-linearity specification of +/- 1LSB, a critical specification for engineers designing instrumentation devices capable of providing more accurate test measurements.
The AD7690 provides an on-chip track-and-hold, and exhibits no pipeline delay or latency, making it ideal for multiple multiplexed-channel applications.
It operates from a single 5V power supply; an optional I/O supply ensures compatibility with 1.8, 2.5, 3 and 5V logic using the SPI-compatible serial interface.
The serial interface also enables designers to 'daisy chain' multiple ADCs using a single wire interface - reducing external component count and wiring connections - and provides an optional 'busy' indicator for added flexibility.
The device also includes an internal conversion clock, eliminating the need for an external clocking device.
In addition to the AD7690, Analog Devices is introducing the AD7691, which also delivers 18bit linearity for applications that do not have the same speed requirements or board space limitations.
The AD7691 provides throughput of 250ksps and operates on a 2.7 or 5V single power supply.
The devices work well with the ADA4941-1, a 16bit and 18bit single-ended to differential ADC driver from Analog Devices.
The AD7690 and AD7691 are sampling now with production quantities available in February 2006.
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