Dual Serial 18-Bit SoftSpan I DACs

The LTC2758 is a dual 18-bit multiplying serial-input, current-output digital-to-analog converter. LTC2758A provides full 18-bit performance (INL and DNL of ±1LSB maximum) over temperature without any adjustments. 18-bit monotonicity is guaranteed in all performance grades. This SoftSpan™ DAC operates from a single 3V to 5V supply and offers six output ranges (up to ±10V) that can be programmed through the 3-wire SPI serial interface or pin-strapped for operation in a single range.

Any on-chip register (including DAC output-range settings) can be read for verification in just one instruction cycle; and if you change register content, the altered register will be automatically read back during the next instruction cycle.

Voltage-controlled offset and gain adjustments are also provided; and the power-on reset circuit and CLR pin both reset the DAC outputs to 0V regardless of output range.

Applications

* Instrumentation

* Medical Devices

* Automatic Test Equipment

* Process Control and Industrial Automation

* Maximum 18-Bit INL Error: ±1 LSB Over Temperature

* Program or Pin-Strap Six Output Ranges: 0V to 5V, 0V to 10V, –2.5V to 7.5V, ±2.5V, ±5V, ±10V

* Guaranteed Monotonic Over Temperature

* Glitch Impulse 0.4nV•s (3V), 2nV•s (5V)

* 18-Bit Settling Time: 2.1μs

* 2.7V to 5.5V Single Supply Operation

* 1μA Maximum Supply Current

* Voltage-Controlled Offset and Gain Trims

* Serial Interface with Readback of All Registers

* Clear and Power-On-Reset to 0V Regardless of Output Range

* 48-Pin 7mm × 7mm LQFP Package