ADI LTC2686八路16位电压输出软横跨(SoftSpan)DAC解决方案

ADI公司的 LTC2686是八路16位±15 V电压输出软横跨(SoftSpan)数模转换器(DAC),集成了精密基准电压.器件保证单调特性,内置轨到轨输出缓冲器,能提供源电流和接收电流高达55mA. 这种SoftSpan™ DAC五个输出高达±15 V,每路的范围可独立编程.内部4.096V(精度±10 ppm/°C)精密基准设定输出电压的精确度,而外接基准能用作其它范围的选择.三种切换引脚支持输入寄存器A和输入寄存B转换或多个频率的正弦抖动.模拟复接器简化了引脚电压的测量,负载电流和结温.可编失调和增益寄存器改善了DAC输出的精确度.SPI和MICROWIRE™兼容的3线串行接口工作在低到1.71V的逻辑电平,时钟速率高达50MHz.最大INL误差±3 LSB.6mmx6mm 40引脚LFCSP封装.主要用在光网络,仪器仪表,数据采集,自动测试设备,过程控制和工业自动化.本文介绍了LTC2686主要特性,框图和功能框图, 以及评估板DC2904A-B主要特性,电路图,材料清单和PCB设计图.

The LTC2686 is an 8-channel, 16-bit, ±15 V digital-to-analog converter(DAC) with an integrated precision reference. The LTC2686is guaranteed monotonic and has built in rail-to-rail output buffersthat can source or sink up to 55 mA. This SoftSpan™ DAC offers

five output ranges up to ±15 V. The range of each channel isindependently programmable.

The internal 4.096 V precision reference sets the accuracy of theoutput voltage. An external reference can be used for additionalrange options. Three toggle pins support Input Register A and InputRegister B toggle or sinusoidal dither at multiple frequencies. Ananalog multiplexer simplifies measurement of pin voltages, loadcurrents, and junction temperature.

Programmable offset and gain registers improve the accuracy ofthe DAC outputs.

The serial peripheral interface (SPI) and MICROWIRE™-compatible,3-wire serial interface operates on logic levels as low as 1.71 Vand clock rates up to 50 MHz.

LTC2686主要特性:

► Eight independent SoftSpan DAC channels

► Independently programmable output ranges: 0 V to 5 V, 0 V to10 V, ±5 V, ±10 V, ±15 V

► Full 16-bit resolution at all ranges