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