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Amplifiers/Converters??

Maxim's TQFN-packaged DACs save 'considerable' board space

Posted: 11 Nov 2005 ?? ?Print Version ?Bookmark and Share

Keywords:maxim integrated products? max5548? max5550? digital-to-analog converter? dac?

The MAX5548 (8-bit) and MAX5550 (10-bit) devices from Maxim Integrated Products are dual, 30mA, current-output digital-to-analog converters (DACs) housed in a 3-by-3mm TQFN package. According to the company, the 9mm? TQFN package saves considerable board space compared to the nearest competitive solution at 30mm? in a TSSOP. These devices feature a pin-selectable SPI or I?C interface. They are highly accurate and guaranteed monotonic over the -40C to 85C operating temperature range.

The MAX5548/MAX5550 feature a single 2.7V to 5.5V supply range and low 200?A/DAC supply current. A software-selectable shutdown feature reduces the supply current to 5?A (max). These devices also feature a 1.25V internal reference, but also accept an external reference from 1.225V to 1.275V. A DOUT output allows daisy-chaining of multiple devices, or it may be used for readback in SPI mode. Addressing options allow multiple devices to be connected to the same bus in I?C applications.

Target applications for these low-cost, current-output DACs are PIN-diode biasing, RF attenuator control and VCO tuning. The DACs are available in ultra-small, 3-by-3mm, 16-pin TQFN packages, with prices starting at $2.97 (MAX5548) and $3.37 (MAX5550).



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