Linear Technology's 16-, 12-bit LTC2668 combines sixteen voltage output DACs with five software-programmable (SoftSpan) or pin-configurable output voltage ranges up to ±10 V. Each output span is independently selectable per channel, with full 16-, 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.
Video: 16-Channel, 16/12-Bit Voltage Output DACs in a Tiny 6 mm x 6 mm Package
LTC2668 Typical Application |
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Features
- 16 DACs in small 6 mm × 6 mm QFN package
- Internal precision reference: 10 ppm/°C (max.)
- Independently programmable output ranges: 0 V to 5 V, 0 V to 10 V, ±2.5 V, ±5 V, ±10 V
- Maximum INL error: ±4 LSB (16-bits), ±1 LSB (12-bits)
- Flexible single- or dual-supply operation
- Guaranteed monotonic overtemperature
- Output buffers drive ±10 mA and 1000 pF loads
- A/B toggle via software or dedicated pin
- Internal 16:1 analog MUX
- Asynchronous DAC update pin
- 1.8 V to 5 V SPI serial interface
- -40°C to 125°C operation
Flexible supply voltages
- V+ positive rail
- 4.5 V to 15.75 V
- 4.6 mA operating, 35 μA shutdown
- V– negative rail
- Single supply: connect to GND
- Dual supply: –4.5 V to –15.75 V
- 4.6 mA operating, 27 μA shutdown
- AVP DAC core supply
- 4.5 V to 5.5 V
- 5.4 mA operating, 1 μA shutdown
- OVP digital I/O supply
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Internal 16:1 analog MUX
- Connect any DAC output to the MUX pin
- Eliminates high pin count external MUX
- Saves board space
- Use this function for:
- Calibration
- Closed-loop control
- Monitor circuit integrity
- Output range: V– to (V+ –1.4 V)
Buffered voltage outputs
- Rail-to-rail outputs
- ±10 mA load, swings within 1.4 V of rails
- Unloaded, swings within 10 mV of rails
- Fast settling
- 5 V/μs slew rate
- 10 V step settles to 1 LSB in 9 μs
- Stable with up to 1000 pF of load
A/B toggle function
- Quickly toggle between two DAC codes
- Hardware mode using TGP pin
- Software mode using SPI
- Use this function to:
- Alternate between two output levels (On / Off, High / Low)
- Dither or modulate a DC bias level
- Generate an AC bias
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