GENERAL DESCRIPTION
The AD5370 contains forty 16-bit DACs in a single 64-lead LFCSP and a 64-lead LQFP. The device provides buffered voltage outputs with a span that is 4× the reference voltage. The gain and offset of each DAC channel can be independently trimmed to remove errors. For even greater flexibility, the device is divided into five groups of eight DACs. Three offset DAC channels allow the output range of blocks to be adjusted. Group 0 can be adjusted by Offset DAC 0, Group 1 can be adjusted by Offset DAC 1, and Group 2 to Group 4 can be adjusted by Offset DAC 2. The AD5370 offers guaranteed operation over a wide supply range, with VSSfrom −16.5 V to −4.5 V and VDDfrom +9 V to +16.5 V. The output amplifier headroom requirement is 1.4 V operating with a load current of 1 mA. 

FEATURES
   40-channel DAC in a 64-lead LFCSP and a 64-lead LQFP
   Guaranteed monotonic to 16 bits
   Maximum output voltage span of 4 × VREF(20 V)
   Nominal output voltage span of −4 V to +8 V
   Multiple, independent output spans available
   System calibration function allowing user-programmable
      offset and gain
   Channel grouping and addressing features
   Thermal shutdown function
   DSP/microcontroller-compatible serial interface
   SPI serial interface
   2.5 V to 5.5 V digital interface
   Digital reset (RESET)
   Clear function to user-defined SIGGNDx
   Simultaneous update of DAC outputs

APPLICATIONS
   Level setting in automatic test equipment (ATE)
   Variable optical attenuators (VOA)
   Optical switches
   Industrial control systems
   Instrumentation