16-Channel, 16-Bit/12-Bit Voltage Output DACs ±10V VOUT SoftSpan DACs with 10ppm/°C Maximum Reference The 16-bit/12-bit LTC®2668 combines 16 voltage output DACs with five software-programmable (SoftSpan™) or pin-configurable output voltage ranges up to ±10V. Each output span is independently selectable per channel, with full 16-bit/12-bit resolution at all spans. Tight DC linearity with low AC and DC crosstalk ensures precision control in multichannel open or closed-loop systems. Additional features include an internal 16:1 analog multiplexer for calibration or monitoring circuit integrity, and a toggle function that allows the DAC to quickly toggle between two DAC codes. Features nn nn nn nn nn nn nn nn nn nn nn nn 16 DACs in Small 6mm × 6mm QFN Package Internal Precision Reference: 10ppm/°C (Max) Independently Programmable Output Ranges: 0V to 5V, 0V to 10V, ±2.5V, ±5V, ±10V Maximum INL Error: ±4LSB (16 Bits), ±1LSB (12 Bits) Flexible Single or Dual Supply Operation Guaranteed Monotonic Over Temperature Output Buffers Drive ±10mA and 1000pF Loads A/B Toggle via Software or Dedicated Pin Internal 16:1 Analog MUX Asynchronous DAC Update Pin 1.8V to 5V SPI Serial Interface –40°C to 125°C Operation Quad Octal 16-Channel 16-Bit LTC2664-16 LTC2666-16 LTC2668-16 12-Bit LTC2664-12 LTC2666-12 LTC2668-12 Package 5mm × 5mm QFN 5mm × 5mm QFN 6mm × 6mm QFN L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and SoftSpan is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Internal Analog MUX nn nn nn nn nn Connect Any DAC Output to the MUX Pin Eliminates High Pin Count External MUX Saves Board Space Use this Function for: nn Calibration nn Closed-Loop Control nn Monitor Circuit Integrity Output Range: V– to (V+ –1.4V) ±10V • • • ±10V MUX ADC 0V to 5V 5V 5V 5V OVP AVP V+ • • • • • • µC SPI Control Logic 0V to 5V L L LTC2668 LTC2668 GND 0V to 3V V– 3V 5V 12V OVP AVP V+ L Flexible Supply Voltages nn 0V to 10V nn LTC2668 GND 0V to 1.8V V– 1.8V 5V +15V OVP AVP V+ L nn ±10V nn LTC2668 GND V– V+ Positive Rail nn 4.5V to 15.75V nn 4.6mA Operating, 35µA Shutdown – V Negative Rail nn Single Supply: Connect to GND nn Dual Supply: –4.5V to –15.75V nn 4.6mA Operating, 27µA Shutdown AVP DAC Core Supply nn 4.5V to 5.5V nn 5.4mA Operating, 1µA Shutdown OVP Digital I/O Supply nn 1.71V to 5.5V nn <1µA –15V Buffered Voltage Outputs nn nn nn Rail-to-Rail Outputs nn ±10mA Load, Swings within 1.4V of Rails nn Unloaded, Swings within 10mV of Rails Fast Settling nn 5V/µs Slew Rate nn 10V Step Settles to 1LSB in 9µs Stable with Up to 1000pF of Load +12V ±5% L LTC2668 –12V ±5% ±10V 1000pF 1k A/B Toggle Function nn A B TGP L LTC2668 nn Quickly Toggle Between Two DAC Codes nn Hardware Mode Using TGP Pin nn Software Mode Using SPI Use this Function to: nn Alternate Between Two Output Levels (On/Off, High/Low) nn Dither or Modulate a DC Bias Level nn Generate an AC Bias www.linear.com/2668 n 1-800-4-LINEAR 0615C