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ADN2872ACPZ-RL

更新时间： 2024-01-15 07:11:46

品牌	Logo	应用领域
亚德诺 - ADI		驱动器驱动程序和接口二极管激光二极管接口集成电路 PC
页数	文件大小	规格书
20页	582K
描述
3.3 V Dual-Loop, 50 Mbps to 3.3 Gbps Laser Diode Driver

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技术参数
数据手册

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ADN2872ACPZ-RL 技术参数

是否无铅：	含铅	是否Rohs认证：	符合
生命周期：	Obsolete	零件包装代码：	QFN
包装说明：	4 X 4 MM, ROHS COMPLIANT, MO220VGGD-2, LFCSP-24	针数：	24
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.13
Samacsys Confidence：		Samacsys Status：	Released
Schematic Symbol：	https://componentsearchengine.com/symbol.php?partID=579200	PCB Footprint：	https://componentsearchengine.com/footprint.php?partID=579200
Samacsys PartID：	579200	Samacsys Image：	https://componentsearchengine.com/Images/9/ADN2872ACPZ-RL.jpg
Samacsys Thumbnail Image：	https://componentsearchengine.com/Thumbnails/1/ADN2872ACPZ-RL.jpg	Samacsys Pin Count：	25
Samacsys Part Category：	Integrated Circuit	Samacsys Package Category：	Other
Samacsys Footprint Name：	QFN50P400X400X100-25N	Samacsys Released Date：	2017-01-11 11:21:59
Is Samacsys：	N	接口集成电路类型：	INTERFACE CIRCUIT
JESD-30 代码：	S-XQCC-N24	JESD-609代码：	e3
长度：	4 mm	湿度敏感等级：	1
功能数量：	1	端子数量：	24
最高工作温度：	85 °C	最低工作温度：	-40 °C
封装主体材料：	UNSPECIFIED	封装代码：	HVQCCN
封装等效代码：	LCC24,.16SQ,20	封装形状：	SQUARE
封装形式：	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	峰值回流温度（摄氏度）：	225
电源：	3.3 V	认证状态：	Not Qualified
座面最大高度：	1 mm	子类别：	Display Drivers
最大供电电压：	3.6 V	最小供电电压：	3 V
标称供电电压：	3.3 V	表面贴装：	YES
温度等级：	INDUSTRIAL	端子面层：	MATTE TIN
端子形式：	NO LEAD	端子节距：	0.5 mm
端子位置：	QUAD	处于峰值回流温度下的最长时间：	NOT SPECIFIED
宽度：	4 mm	Base Number Matches：	1

ADN2872ACPZ-RL 数据手册

ADN2872

THEORY OF OPERATION

OPTICAL COUPLING

Laser diodes have a current-in to light-out transfer function, as

shown in Figure 23. Two key characteristics of this transfer

function are the threshold current, I_TH, and slope in the linear

region beyond the threshold current, referred to as slope

efficiency, LI.

MPD

INPUT

BIAS

SHA

BIAS

CURRENT

1.2V

BGAP

ER =

HIGH

SPEED

SWITCH

ERSET

P1 + P0

PAVSET

MOD

SHA

ΔP

MOD

CURRENT

100

ΔI

ΔP

ΔI

LI =

Figure 24. Dual-Loop Control of Average Power and Extinction Ratio

A dual loop is made up of an average power control loop

CURRENT

(APCL) and the extinction ratio control loop (ERCL), which are

separated into two time states. During Time Φ1, the APC loop

is operating, and during Time Φ2, the ER loop is operating.

Figure 23. Laser Transfer Function

DUAL-LOOP CONTROL

Average Power Control Loop

Typically, laser threshold current and slope efficiency are both

functions of temperature. For FP and DFB type lasers, the

threshold current increases and the slope efficiency decreases

with increasing temperature. In addition, these parameters vary

as the laser ages. To maintain a constant optical average power

and a constant optical extinction ratio over temperature and

laser lifetime, it is necessary to vary the applied electrical bias

current and modulation current to compensate for the laser

changing LI characteristics.

The APCL compensates for changes in the laser diode (LD), I_TH

and LI, by varying I_BIAS. APC control is performed by measuring

the MPD current, I_MPD. This current is bandwidth limited by the

MPD. This is not a problem because the APCL must be low

frequency and the APCL must respond to the average current

from the MPD. The APCL compares I_MPD× R_PAVSETto the BGAP

voltage, V_BGAP. If I_MPDfalls, the bias current is increased until

_MPD× R_PAVSETequals V_BGAP. Conversely, if the I_MPDincreases, I_BIAS

is decreased.

Single-loop compensation schemes use the average monitor

photodiode (MPD) current to measure and maintain the

average optical output power over temperature and laser aging.

The ADN2872 is a dual-loop device, implementing both this

primary average power control loop and a secondary control

loop, which maintains a constant optical extinction ratio. The

dual-loop control of the average power and extinction ratio

implemented in the ADN2872 can be used successfully with

both lasers that maintain good linearity of LI transfer characteris-

tics over temperature, and with those that exhibit increasing

nonlinearity of the LI characteristics over temperature.

Modulation Control Loop

The ERCL measures the slope efficiency, LI, of the laser diode

by monitoring the I_MPDchanges. During the ERCL, I_MPDis

temporarily increased by ΔI_MOD. The ratio between I_MPDand

ΔI_MODis a fixed ratio of 50:1, but during startup, this ratio is

increased to decrease settling time.

During ERCL, switching in ΔI_MODcauses a temporary increase

in average optical power, ΔP_AV. However, the APC loop is disabled

during ERCL, and the increase is kept small enough so as not to

disturb the optical eye. When ΔI_MODis switched into the laser

circuit, an equal current, I_EX, is switched into the PAVSET resis-

tor. The user sets the value of I_EX; this is the ERSET setpoint. If

ΔI_MPDis too small, the control loop knows that LI has decreased,

and increases I_MPDand, therefore, ΔI_MODaccordingly until ΔI_MPD

is equal to I_EX. The previous control cycle status of the I_BIASand I_MOD

settings are stored on the hold capacitors, PAVCAP and ERCAP.

Dual Loop

The ADN2872 uses a proprietary patented method to control both

average power and extinction ratio. The ADN2872 is constantly

sending a test signal on the modulation current signal and

reading the resulting change in the MPD current as a means of

detecting the slope of the laser in real time. This information is

used in a servo to control the ER of the laser, which is done in a

time-multiplexed manner at a low frequency, typically 80 Hz.

Figure 24 shows the dual-loop control implementation on the

ADN2872.

The ERCL is constantly measuring the actual LI curve; it compen-

sates for the effects of temperature and for changes in the LI

curve due to laser aging. Therefore, the laser can be calibrated

once at 25°C so that it can then automatically control the laser

over temperature. This eliminates the expensive and time

consuming temperature calibration of a laser.

Rev. 0 | Page 10 of 20

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与ADN2872ACPZ-RL相关器件

型号	品牌	描述	获取价格	数据表
ADN2873	ADI	3.3 V, 50 Mbps to 4.25 Gbps, Single-Loop, Laser Diode Driver	获取价格
ADN2873ACPZ	ADI	3.3 V, 50 Mbps to 4.25 Gbps, Single-Loop, Laser Diode Driver	获取价格
ADN2873ACPZ-RL	ADI	3.3 V, 50 Mbps to 4.25 Gbps, Single-Loop, Laser Diode Driver	获取价格
ADN2873ACPZ-RL7	ADI	3.3 V, 50 Mbps to 4.25 Gbps, Single-Loop, Laser Diode Driver	获取价格
ADN2880	ADI	3.2 Gbps, 3.3 V, Low Noise, Transimpedance Amplifier	获取价格
ADN2880ACHIPS	ADI	3.2 Gbps, 3.3 V, Low Noise, Transimpedance Amplifier	获取价格

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