Datasheet > MAX3863ETJ+T

MAX3863ETJ+T

更新时间： 2024-02-06 15:36:48

品牌	Logo	应用领域
美信 - MAXIM		接口集成电路
页数	文件大小	规格书
15页	400K
描述
Interface Circuit, BIPolar, ROHS COMPLIANT, TQFN-32

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技术参数
数据手册

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MAX3863ETJ+T 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Obsolete	零件包装代码：	QFN
包装说明：	HVQCCN, LCC32,.2SQ,20	针数：	32
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.81
接口集成电路类型：	INTERFACE CIRCUIT	JESD-30 代码：	S-XQCC-N32
JESD-609代码：	e3	长度：	5 mm
湿度敏感等级：	1	功能数量：	1
端子数量：	32	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：	LCC32,.2SQ,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）：	260	电源：	3.3 V
认证状态：	Not Qualified	座面最大高度：	0.8 mm
子类别：	Display Drivers	最大供电电压：	3.6 V
最小供电电压：	3.15 V	标称供电电压：	3.3 V
表面贴装：	YES	技术：	BIPOLAR
温度等级：	INDUSTRIAL	端子面层：	Tin (Sn)
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：	5 mm	Base Number Matches：	1

MAX3863ETJ+T 数据手册

2.7Gbps Laser Driver with Modulation

Compensation

MAX863

the current from the inductor flows to the bias input.

Table 1. Optical Power Relations

This reduces the current through the laser diode from

PARAMETER

Average Power

SYMBOL

RELATION

the average of I

by half of I

. The resulting

MOD

BIAS

= (P + P )/2

peak-to-peak current through the laser diode is then

. See the Typical Operating Circuit. The require-

AVG

Extinction Ratio

r = P /P

e 1 0

MOD

ment for compliance in the AC-coupled circuit:

Optical Power of a 1

Optical Power of a Zero

P = 2P

r /(r + 1)

AVG e e

•

V —Diode bias point voltage (1.2V typ)

P = 2P

/(r + 1)

AVG

R —Diode bias point resistance (5Ω typ)

Optical Amplitude

Laser Slope Efficiency

Modulation Current

Threshold Current

Bias Current

= P - P

P-P 1 0

P-P

L—Diode lead inductance (1nH typ)

η = P /I

P-P MOD

= P /η

R —Series matching resistor (20Ω typ)

MOD

P-P

at I ≥ I

0 TH

MOD

≥ I + I

−

× (R + R ) ≥ 1.8V

D L

BIAS

BIAS TH

MOD

Laser to Monitor

Transfer

MD AVG

MON

The time constant associated with the output pullup

inductor and the AC-coupling capacitor, impacts the

pattern-dependent jitter. For this second-order network

use information about the effects of temperature and

aging. The laser driver automatically adjusts the bias to

maintain the constant average power. The new bias con-

dition requires proper compensation of the modulation

current. The designer must predict the slope efficiency of

the laser after its bias threshold current has changed.

The modulation and bias currents under a single operat-

ing condition:

L usually limits the low-frequency cutoff. The capacitor

C is selected so:

× (R +R ) >

D L

(R +R )

Keep the peak voltage droop less than 3% of the peak-

to-peak amplitude during the maximum CID period t.

The required time constant:

r^e−1

r^e+1

AVG

= 2 ×

MOD

For AC-coupled diodes:

−t

2.8% = 1− e

MOD

τ = 35 × t

BIAS TH

If τ = L /25Ω, and t = 100UI = 40ns, then L = 35µH.

The required compensation factor is then:

Place a good high-frequency inductor of 2µH on the

transmission line to the laser. Then you can place a

low-frequency inductor of 33µH at a convenient dis-

tance from the driver output.

− I

MOD1

MOD2

K =

− I

BIAS2

BIAS1

Programming the Bias Current

When the APC loop is enabled, the actual bias current is

reduced from the maximum value to maintain constant

current from the monitor diode. With closed-loop control,

the bias current will be set by the transfer function of the

monitor diode to laser diode current. For example, if the

transfer function to the monitor diode is 10.0µA/mA, then

Once the value of the compensation factor is known, the

fixed portion of the modulation current is calculated from:

= I

− K × I

MOD BIAS

MODS

setting I

for 500µA results in I

equal to 50mA.

BIAS

Current Limits

The bias current must be limited in case the APC loop

becomes open. The bias current also needs a set point

in case the APC control is not used. The BIASMAX pin

sets the maximum bias current. The BIASMAX current is

established by an internal current regulator, which main-

tains the bandgap voltage of 1.2V across the external

To allow larger modulation current, the laser is AC-

coupled to the MAX3863. In this configuration, a con-

stant current is supplied from the inductor L . When the

MOD pin is conducting, half of I

is supplied from

and half is from the laser diode. When MOD is off,

MOD

_______________________________________________________________________________________

1...6 7 8910 11 12...15

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