WM5628

• Eight 8-bit voltage output DAC's
• Three wire serial interface
• Programmable x1 or x 2 output range.
• Power-on-reset sets outputs to zero
• Buffered voltage reference inputs
• Simultaneous DAC output update

• Programmable d.c. voltage sources
• Digitally controlled attenuator/amplifier
• Signal synthesis
• Mobile communications
• Automatic test equipment
• Process control

Supply Voltage (VDD - VGND) . . . . . . . . . . . .  . . . . +7V
Digital Inputs . . . . . . . . . . . . .GND - 0.3 V, V_DD + 0.3 V
Reference inputs . . . . . . . . . . GND - 0.3 V, V_DD + 0.3 V
Operating temperature range, TA . . . . . . T_MIN to T_MAX
WM5628_C_ . . . . . . . . . . . . . .  . . . . . . .0^oC to +70^oC
WM5628_I_ . . . . . . . . . . . . . . .  . . . . .-40^oC to +85^oC
Storage Temperature . . . . . . . . . .  . -50^oC to +150^oC
Lead Temperature 1.6mm (1/16 inch)
from case for 10 secs . . . . . . . . . . . . . . . . . . . . .260^OC

WM5628L and WM5628 are Octal 8-bit digital to analogue converters (DAC) controlled via a serial interface. Each DAC's output voltage range is programmable for either x1 or x 2 its reference input voltage, allowing near rail to rail operation for the x 2 output range. High impedance buffered voltage reference inputs are provided for each group of four DACs. WM5628L operates on a single supply voltage of 3 V while WM5628 operates on 5 V.
WM5628/L interfaces to all popular microcontrollers and microprocessors via a three wire serial interface with CMOS compatible, schmitt trigger, digital inputs. An 12 bit command word comprises 3 DAC select bits, an output range selection bit and 8-bits of data.

Individual or all DAC outputs are changed using WM5628/L's double buffered DAC registers and the separate LOAD and LDAC inputs. DAC outputs are updated simultaneously by writing a complete set of new values and then pulsing the LDAC input.

The DAC outputs are optimised for single supply operation and driving ground referenced loads.

An internal power-on-reset function sets the DAC's input codes to zero at power up.

Ideal in space critical applications WM5628/L is available in wide-bodied and DIP packages for commercial (0oC to 70oC) and industrial (-40oC to 85oC) temperature ranges.