The AD7490 is a 12-bit, 1 MSPS, successive-approximation (SAR) analog-to-digital converter (ADC) designed with an increased channel count to meet the demands of today's wired and wireless communications applications, as well as industrial and medical instrumentation data acquisition applications. This 16-channel converter is particularly appropriate for multi-channel applications, such as optical networking, in which multiple temperatures are monitored for laser frequency control and power is measured to determine gain. Also featured is a sequencer controlled by a shadow register that allows continuous or single conversions on selected channels. The channel selection function can be altered while the sequence is in progress.

The AD7490 uses advanced design techniques to achieve very low power dissipation at high throughput rates. Three power management modes further maximize performance efficiency at lower throughput rates: full power down, auto shutdown and auto standby. Full power dissipation is just 3.6 mW and in the shutdown mode, power consumption is only 1 microAmp.

This ADC operates from a single 2.7 to 5.25 V supply and contains a Vdrive (interface drive voltage) function to allow the serial interface to connect directly to either 3 or 5 V processor systems independent of Vdd (power supply voltage). Additionally, the converter contains a low-noise, wide bandwidth track/hold amplifier that can handle input frequencies in excess of 1 MHz.

Analog Devices, Inc. 804 Woburn Street Wilmington, MA 01887. Tel: 781-937-1989; Fax: 781-937-1026

There is an escalating demand for increased channel count on analog-to-digital converters (ADCs) and the AD7490 helps meet that requirement with 16 channels. Some of the applications needing more channels include optical, wired and wireless communications and all forms of data acquisition. This ADC may not have the highest resolution in Analog Device's vast array of successive approximation register ADCs, but it does offer impressive qualifications including 12-bit resolution, 1 million samples per-second, and 16-channels.

The AD7490 converter is appropriate for multi-channel applications such as optical networking where multiple temperatures are monitored for laser frequency control and power is measured to determine gain. A very notable feature is the sequencer that is controlled by a shadow register and allows continuous or single conversions on selected channels. The channel selection function also can be altered while the sequence is in progress.

The AD7490 also uses advanced design techniques to achieve very low power dissipation at high throughput rates. Using 3V supplies and 1MSPS throughput rate, the AD7490 consumes 1.2 mA, while 5V supplies and 1MSPS, consume just 2 mA.

The AD7490 is offered in a 32-pin LFCSP (lead frame chip scale package), and is available now for $6.35 in 1,000-piece quantities.

For more information: http://products.analog.com/