Bipolar DAC Ogles Optical Networks

Addressing the requirements of optical networking, ATE and data acquisition applications, the AD5379 is reportedly the industry’s first bipolar, 40-channel, 14-bit voltage-output D/A converter. The device combines 40 D/A converter channels and 40 output amplifiers with gain, all in a single 108-ball chipscale plastic ball grid array (CSPBGA) package measuring only 13 mm x 13 mm. Each D/A channel is monotonic to 14 bits and accurate to 12 bits. Maximum output voltage range is up to 17.5V determined by the value of -VREF and +VREF. The device also allows users to digitally adjust the span and range of each individual D/A converter by writing to on-chip gain and offset gain registers, thereby easing system calibration. Other features include a parallel and a serial interface, an on-chip FIFO that allows up to 120 successive writes, and a three-wire serial interface operating at clock speeds up to 33 MHz and compatible with SPI, QSPI, Microwire and DSP interface standards. In addition, a daisy-chain mode is provided to link multiple devices, and a LDAC function allows the simultaneous update of all 40 channels. Operating temperature range is from -40°C to 85°C. Price is $67.75 each/1,000. ANALOG DEVICES INC., Wilmington, MA. (800) 262-5643.