Sunnyvale, Calif. - Its rivals have packed analog-to-digital converters into eight-pin SOT-23, but according to Maxim Integrated Products, those parts offer a single analog input with a combined reference and supply pin. Maxim is countering with the 150-ksample/second MAX1286-MAX1289 and MAX1086-MAX1089, which include two-channel, 12- and 10-bit A/Ds that interface directly to SPI, QSPI and Microwire devices without external logic. They come in eight-pin SOT-23 packages and are aimed at portable data-acquisition and battery-powered applications.
The MAX1286/MAX1287 and MAX1086/MAX1087 combine a two-channel multiplexer, internal track/hold, clock and VDD monitor. The converters are said to provide a single true-differential input. All of the parts offer 61-dB signal, noise and distortion ratio and all operate from an analog supply range of either 2.7 to 3.6 volts or 4.5 to 5.5 V.
They consume 200 microamps at 150 ksamples/s, but automatic power-down between conversions reduces consumption to 140 microamps at 100 ksamples/s and trims supply current to less than 7 microamps at data rates of 5 ksamples/s or less. The full-scale analog input range is set by an external reference in the 1-V to VDD range.
The MAX1286-MAX1289 and MAX1086-MAX1089 are specified for operation from -40 degrees C to 85 degrees C. In quantities of 1,000, prices start at $2.40 for the MAX1086-MAX1089 and $3.45 for the MAX1286-MAX1289.
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EETInfo No. 625