Analogue, Mixed Signal, LSI


16-bit industrial DAC

1 April 2009 Analogue, Mixed Signal, LSI

Maxim’s MAX5661 single 16-bit DAC with precision high-voltage amplifiers provides a complete solution for programmable current- and voltage-output applications. The output amplifiers swing to industry-standard levels of ±10 V (voltage output) or source from 0 mA (or from 4 mA) to 20 mA (current output). The voltage output drives resistive loads greater than 2 k and capacitive loads of up to 1,2 μF.

Voltage-output force-sense connections compensate for series protection resistors and field-wiring resistance. Short-circuit protection on the voltage output limits output current to 10 mA sourcing or -11,5 mA sinking. The current output drives resistive loads up to 37,5 V and inductive loads up to 1 H.

The MAX5661 provides either a current output or a voltage output. Only one output is active at any given time, regardless of the configuration. The voltage output operates with ±13,48 to ±15,75 V supplies and the current output operates with a single +13,48 to +40 V supply. A +4,75 to +5,25 V digital supply powers the rest of the internal circuitry. A buffered reference input accepts an external +4,096 V reference voltage.

The DAC outputs can be updated using software commands or the asynchronous active-low LDAC input. An asynchronous active-low CLR input sets the DAC outputs to the value stored in the clear register or to zero. The active-low FAULT output asserts when the DAC’s current output is an open circuit, its voltage output is a short circuit, or when the active-low CLR input is low.

The MAX5661 communicates through a 4-wire 10 MHz SPI-/QSPI-/MICROWIRE-compatible serial interface, and the DOUT output allows daisy chaining of multiple devices. It is available in a 10 x 10 mm, 64-pin, LQFP package and operates over the -40°C to +105°C temperature range.

For more information contact Larry Gordon, CST Electronics, +27 (0)11 608 0070, [email protected], www.cstelectronics.co.za



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