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ADI 公司的AD5770R是六路14位分辨率低噪音可編電流輸出的數模轉換器（DAC）光學控制應用器件，采用1.25V片上基準電壓，2.5 kΩ精密電阻作為基準電流產生，芯片溫度，輸出監測功能，故障告警和重置功能.AD5770R包含5個14位分辨率電流源DAC通路和一個14位分辨率電流源和沉的DAC通路：通路0可配置成多達60mA的沉和多達300mA的源，而通路1到5有多個可編輸出電流源范圍由寄存器存儲來定;每個DAC工作在0.8V到AVDD -0.4V電源軌內，以優化電源效率和熱消耗.AD5770R工作電壓從2.9V到5.5V AVDD電源，工作溫度?40℃到+105℃，具有SPI接口，主要工作在光學控制，LED驅動器可編電流源和電流模式偏置。本文介紹了AD5770R主要特性，功能框圖以及評估板EVAL-AD5770RSDZ主要特性，加電圖和電路圖以及材料清單。

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應用：

Photonics control

LED driver programmable current source

Current mode biasing

[原創] ADI AD5770R六路14位低噪音DAC光學控制應用方案

圖1.AD5770R功能框圖

評估板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.

評估板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

圖2.評估板EVAL-AD5770RSDZ外形圖

[原創] ADI AD5770R六路14位低噪音DAC光學控制應用方案