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
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
图3.评估板eval-ad5770rsdz加电图
图4.评估板eval-ad5770rsdz电路图-主器件和pmod连接(1)
图5.评估板eval-ad5770rsdz电路图-主器件和pmod连接(2)
图6.评估板eval-ad5770rsdz电路图-sdp接口连接器
评估板eval-ad5770rsdz材料清单:
详情请见:
https://www.analog.com/media/en/technical-documentation/data-sheets/ad5770r.pdf
和https://www.analog.com/media/en/technical-documentation/user-guides/eval-ad5770rsdz-ug-1267.pdf
ad5770r.pdf
eval-ad5770rsdz-ug-1267.pdf
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