MAX188

The MAX186/MAX188 are 12-bit data-acquisition systems that combine an 8-channel multiplexer, high-band-width track/hold, and serial interface together with high conversion speed and ultra-low power consumption.The devices operate with a single +5V supply or dual ±5V supplies. The analog inputs are software config-urable for unipolar/bipolar and single-ended/differential operation.

The 4-wire serial interface directly connects to SPI™, QSPI™ and Microwire™ devices without external logic. Aserial strobe output allows direct connection to TMS320 family digital signal processors. The MAX186/MAX188 use either the internal clock or an external serial-interfaceclock to perform successive-approximation A/D conver-sions. The serial interface can operate beyond 4MHz when the internal clock is used.

The MAX186 has an internal 4.096V reference while the MAX188 requires an external reference. Both parts have a reference-buffer amplifier that simplifies gaintrim .

The MAX186/MAX188 provide a hard-wired SHDN pin and two software-selectable power-down modes. Accessing the serial interface automatically powers up the devices, and the quick turn-on time allows the MAX186/MAX188 to be shut down between every conversion. Using this technique of powering down between conversions, supply current can be cut to under 10µA at reduced sampling rates.

The MAX186/MAX188 are available in 20-pin DIP and SO packages, and in a shrink small-outline package (SSOP), that occupies 30% less area than an 8-pin DIP.For applications that call for a parallel interface, see the MAX180/MAX181 data sheet. For anti-aliasing filters, consult the MAX274/MAX275 data sheet.