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Dual 1MSps 12-bit ADC aids motor control

Posted: 12 May 2008     Print Version  Bookmark and Share

Keywords:ADC  motor control applications  low power dissipation 

Austriamicrosystems AG has introduced the AS1545, a dual simultaneous sampling 1MSps 12bit ADC, expanding austriamicrosystems' high-speed ADC portfolio.

It offers 12bit resolution on each of the two ADCs and uses advanced design techniques to achieve low power dissipation at high throughput rates. At a conversion speed of 1MSps, including the internal 2.5V reference, the AS1545 uses only 5.5mA. In full power-down mode the supply current drops to less than 1µA.

Two channel advantage
Two complete and independent ADC channels allow simultaneous sampling and conversion of two channels. The 12 input channels are software configurable, allowing each ADC to offer six single-ended channels or three fully or pseudo differential pairs, as programmed. The conversion result of both ADCs is simultaneously available on separate data lines or in succession on one data line if only one serial port is available.

"High speed dual converters like the AS1545 are ideal for motor control applications," said Walter Moshammer, standard linear marketing director at austriamicrosystems. "The 1MSps dual ADC channels allow the simultaneous measurement of the difference of inputs. Additionally, the AS1545 offers a step-up/down counter for counting revolutions as well as a direction bit and information on the quadrature signal phases."

AS1545 operates from a single 2.7 to 5.25 V supply and contains an interface drive voltage (Vdrive) function which enables the serial interface to connect directly to either 3V or 5V processor systems independent of the ADC's supply voltage. The ADC can be interfaced via a high speed SPI/QSPI/Microwire or DSP interface.

The AS1545 also offers a rail to rail analogue input range and can be selected to be a 0V to VREF(or 2 × VREF), with either straight binary or two's complement output coding. The common mode input range of the analogue inputs also goes from rail to rail. The internal 2.5V reference can be overdriven when an external reference is preferred.

The AS1545 is available in 5mm x 5mm 32-pin TQFN package suitable for operating environments ranging from -40°C to +85°C.





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