Linear 公司的LTC2755系列是四路12/14/16位乘法并能联输入电流输出的DAC,工作电压2.7V-5.5V,可以有六种不同的输出电压:单极0-5V,0-10V和双极±5V,±10V,±2.5V, –2.5V到7.5V.16位的DAC LTC2755A-16在整个温度范围内不需调整就具有16位的性能(±1LSB INL和DNL),广泛应用在高精度的失调和增益调整,工业过程控制和自动化,自动测试设备(ATE)以及数据采集系统.本文主要介绍LTC2755系列的主要性能,方框图以及典型应用电路.

    16-Bit Quad IOUT Multiplying DAC Achieves ±1LSB INL and DNL

    The LTC 2755 is a family of quad 12-, 14-, and 16-bit multiplying parallel-input, current-output DACs. These DACs operate from a single 2.7V to 5.5V supply and are all

    guaranteed monotonic over temperature. The LTC2755A-16 provides 16-bit performance (±1LSB INL and DNL) over temperature without any adjustments. These SoftSpan™ DACs offer six output ranges—two unipolar and four bipolar—that can be programmed through the parallel interface, or pinstrapped for operation in a single range.

    The LTC2755 DACs use a bidirectional input/output parallel interface that allows readback of any internal register, including the DAC output span settings. A power-on reset circuit resets the DAC outputs to 0V when power is initially applied. A logic low on the CLR pin asynchronously clears the DACs to 0V in any output range.

    The parts are specified over commercial and industrial temperature ranges.

      主要特性:

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

    ■ Maximum 16-Bit INL Error: ±1 LSB over Temperature

    ■ Low 1μA (Maximum) Supply Current

    ■ Guaranteed Monotonic over Temperature

    ■ Low Glitch Impulse 1nV•s

    ■ 2.7V to 5.5V Single Supply Operation

    ■ 2μs Settling Time to ±1 LSB

    ■ Parallel Interface with Readback of All Registers

    ■ Asynchronous CLR Pin Clears DAC Outputs to 0V in Any Output Range

    ■ Power-On Reset to 0V

    ■ 64-Pin 9mm × 9mm QFN Package

      应用:

    ■ High Resolution Offset and Gain Adjustment

    ■ Process Control and Industrial Automation

    ■ Automatic Test Equipment

    ■ Data Acquisition Systems

    图1. LTC2755系列方框图.

      图2. LTC2755A-16应用电路图