The LTC2668 is a family of 16-channel, 16-/12-bit ±10V digital-to-analog converters with integrated precision references. They are guaranteed monotonic and have built-in rail-to-rail output buffers. These SoftSpan™ DACs offer five output ranges up to ±10V. The range of each channel is independently programmable, or the part can be hardware-configured for operation in a fixed range. The integrated 2.5V reference is buffered separately to each channel; an external reference can be used for additional range options. The LTC2668 also includes A/B toggle capability via a dedicated pin or software toggle command. The SPI/Microwire-compatible 3-wire serial interface operates on logic levels as low as 1.71V at clock rates up to 50MHz. Applications * Optical Networking * Instrumentation * Data Acquisition * Automatic Test Equipment * Process Control and Industrial Automation * Precision Reference 10ppm/°C Max* Independently Programmable Output Ranges: 0V to 5V, 0V to 10V, ±2.5V, ±5V, ±10V* Full 16-Bit/12-Bit Resolution at All Ranges* Maximum INL Error: ±4LSB at 16 Bits* A/B Toggle via Software or Dedicated Pin* 16:1 Analog Multiplexer* Guaranteed Monotonic Over Temperature* Internal or External Reference* Outputs Drive ±10mA Guaranteed* 1.8V to 5V SPI Serial interface* 6mm × 6mm 40-Lead QFN Package