CAMPBELL, Calif. Summit Microelectronics Inc. has introduced what it claims is the first digital-to-analog converter with non-volatile E2PROM on-chip. The added memory eliminates the need for an external memory to hold the D/A values and allows the device to power-on with a reset value. Packaged in a 20-pin small-outline IC and priced at $2.80 in lots of 1,000, the S9408 is a four-channel, 8-bit converter intended to be a replacement for mechanical potentiometers in instrumentation and process-control applications.
It operates from a single 2.7- to 5.5-V power supply and contains four D/A converters, each with an 8-bit data register to hold the binary value of the output voltage. In parallel with the data register is an 8-bit E2PROM register that can load its contents into the data register or be loaded with the contents of the data register. Each D/A converter also contains a resistor network, and each has outputs buffered by a unity-gain amplifier. Converters can be programmed independently, and each has its own electrically isolated voltage reference input.
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EETInfo No. 650