AD5770R:分辨率低噪音可编电流输出的数模转换器

电子工程师 2019-05-01 5108

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描述

　　ADI公司的AD5770R是六路14位分辨率低噪音可编电流输出的数模转换器（DAC）光学控制应用器件，采用1.25V片上基准电压，2.5 kΩ精密电阻作为基准电流产生，芯片温度，输出监测功能，故障告警和重置功能.AD5770R包含5个14位分辨率电流源DAC通路和一个14位分辨率电流源和沉的DAC通路：通路0可配置成多达60mA的沉和多达300mA的源，而通路1到5有多个可编输出电流源范围由寄存器存储来定;每个DAC工作在0.8V到AVDD -0.4V电源轨内，以优化电源效率和热消耗.AD5770R工作电压从2.9V到5.5V AVDD电源，工作温度−40℃到+105℃，具有SPI接口，主要工作在光学控制，LED驱动器可编电流源和电流模式偏置。本文介绍了AD5770R主要特性，功能框图以及评估板EVAL-AD5770RSDZ主要特性，加电图和电路图以及材料清单。

　　The AD5770R is a 6-channel， 14-bit resolution， low noise， programmable current output， digital-to-analog converter （DAC） for photonics control applications. The device incorporates a 1.25 V， on-chip voltage reference， a 2.5 kΩ precision resistor for reference current generation， die temperature， output monitoring functions， fault alarm， and reset functions.

　　The AD5770R contains five 14-bit resolution current sourcing DAC channels and one 14-bit resolution current sourcing and sinking DAC channel.

　　Channel 0 can be configured to sink up to 60 mA and source up to 300 mA. Channel 1 to Channel 5 have multiple programmable output current sourcing ranges set by register access.

　　Each DAC operates with a wide power supply rail from 0.8 V to AVDD − 0.4 V for optimizing power efficiency and thermal power dissipation.

　　The AD5770R operates from a 2.9 V to 5.5 V AVDD supply and is specified over the −40℃ to +105℃ temperature range.

　　AD5770R主要特性：

　　6-channel， current output DAC

　　14-bit resolution

　　Programmable output current ranges

　　Channel 0： 0 mA to 300 mA， −60 mA to +300 mA， −60 mA to 0 mA

　　Channel 1： 0 mA to 140 mA， 0 mA to 250 mA

　　Channel 2： 0 mA to 55 mA， 0 mA to 150 mA

　　Channel 3， Channel 4， Channel 5： 0 mA to 45 mA， 0 mA to 100 mA

　　All current sourcing output ranges scale back by up to 0.5×

　　1.25 V， on-chip voltage reference

　　Integrated precision reference resistor

　　SPI interface

　　Reset function

　　Output current monitor

　　Compliance voltage monitor

　　Die temperature monitor

　　Integrated thermal shutdown

　　49-ball，4 mm × 4 mm WLCSP package

　　Operating temperature： −40℃ to +105℃

　　AD5770R应用：

　　Photonics control

　　LED driver programmable current source

　　Current mode biasing

数模转换器

　　图1.AD5770R功能框图

　　评估板EVAL-AD5770RSDZ

　　The EVAL-AD5770RSDZ is a fully featured evaluation board that is designed to help the user evaluate the AD5770R 6-channel， 14-bit， current output digital-to-analog converter （DAC）。

　　The EVAL-AD5770RSDZ evaluation board is controlled by the following two methods： the on-board P11 connector and the EVAL-SDP-CB1Z （Connector P10）。 The system development （SDP-B） board uses the AD5770R evaluation software to control the EVAL-AD5770RSDZ evaluation board via a Windows® PC USB port.

　　The EVAL-AD5770RSDZ board contains a power solution that uses the ADP5073 switching regulator to generate −2 V from a +3.3 V supply and the ADP1741 linear regulator to generate +2 V from a +3.3 V supply. Alternatively， the AD5770R also uses a linear power supply connected through the nine on-board connectors （P0 to P8）。 The AD5770R incorporates an internal 1.25 V precision reference. The EVAL-AD5770RSDZ board contains an additional 1.25， V 0.5 ppm/°C voltage reference.

　　The AD5770R evaluation software provides an intuitive graphic user interface （GUI） that configures and controls the AD5770R over the serial peripheral interface （SPI）。

　　The AD5770R is a 6-channel， 14-bit resolution， low noise， programmable current output DAC for photonics control applications. The output current ranges are software selectable， and channels are routed to the MUX_OUT pin for external monitoring.

　　See the AD5770R data sheet for full details and consult the AD5770R data sheet in conjunction with this user guide when using the EVAL-AD5770RSDZ board.

　　评估板EVAL-AD5770RSDZ主要特性：

　　Fully featured evaluation board for the AD5770R

　　PC control in conjunction with Analog Devices® Inc.， EVAL-SDP-CB1Z system development platform

　　PC software for control

　　图2.评估板EVAL-AD5770RSDZ外形图

数模转换器