18-Bit SoftSpan I DAC with Parallel I/O

The LTC2757 is an 18-bit multiplying parallel-input, current-output digital-to-analog converter that 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 parallel interface or pin-strapped for operation in a single range.

In addition to its precision DC specifications, the LTC2757 also offers excellent AC specifications, including 2.1μs full-scale settling to 1LSB and 1.4nV•s glitch impulse.

The LTC2757 uses a bidirectional input/output parallel interface that allows readback of any on-chip register, including DAC output-range settings; and a CLR pin and power-on reset circuit that each reset the DAC output 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

* Low Glitch Impulse 1.4nV•s (3V), 3nV•s (5V)

* 18-Bit Settling Time: 2.1μs

* 2.7V to 5.5V Single Supply Operation

* Reference Current Constant for All Codes

* Voltage-Controlled Offset and Gain Trims

* Parallel Interface with Readback of All Registers

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

* 48-Pin 7mm × 7mm LQFP Package