Datasheet > MAX3869EHJ+T

MAX3869EHJ+T

更新时间： 2024-02-23 17:11:11

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	672K
描述
Interface Circuit, PQFP32, 5 X 5 MM, 1 MM HEIGHT, ROHS COMPLIANT, MS-026AAA-HD, TQFP-32

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MAX3869EHJ+T 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Active	零件包装代码：	QFP
包装说明：	HTFQFP, TQFP32,.28SQ	针数：	32
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.11
接口集成电路类型：	INTERFACE CIRCUIT	JESD-30 代码：	S-PQFP-G32
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：	PLASTIC/EPOXY
封装代码：	HTFQFP	封装等效代码：	TQFP32,.28SQ
封装形状：	SQUARE	封装形式：	FLATPACK, HEAT SINK/SLUG, THIN PROFILE, FINE PITCH
峰值回流温度（摄氏度）：	260	电源：	3.3/5 V
认证状态：	Not Qualified	座面最大高度：	1.2 mm
子类别：	Display Drivers	最大供电电压：	5.5 V
最小供电电压：	3.14 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 (Sn)	端子形式：	GULL WING
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

MAX3869EHJ+T 数据手册

+3.3V, 2.5Gbps SDH/SONET Laser Driver

with Current Monitors and APC

Pin Description (continued)

NAME

OUT-

FUNCTION

Negative Modulation-Current Output. I

Ground for Output Circuitry

Ground for APC

flows through this pad when input data is low.

MOD

GND4

GND3

Monitor Diode Input. Connect this pad to a monitor photodiode anode. A capacitor to ground

is required to filter high-speed AC monitor photocurrent.

CC3

Power Supply for APC

A capacitor connected from this pad to ground controls the dominant pole of the APC feed-

CAPC

back loop (C

= 0.1µF).

APC

GND2

N.C.

Ground for Internal Reference

No Connection. Leave unconnected.

A resistor connected from this pad to ground sets the desired average optical power.

Connect 100kΩ from this pad to ground if APC is not used.

APCSET

MODSET

BIASMAX

A resistor connected from this pad to ground sets the desired modulation current.

A resistor connected from this pad to ground sets the maximum bias current. The APC

function can subtract from this maximum value, but cannot add to it.

CC2

Power Supply for Internal Reference

allows the output at OUT+ to swing above and below

_______________Detailed Description

the supply voltage V . A simplified functional diagram

The MAX3869 laser driver consists of two main parts: a

high-speed modulation driver and a laser-biasing block

with automatic power control (APC). The circuit design

is optimized for both high-speed and low-voltage

(+3.3V) operation. To minimize the pattern-dependent

jitter of the input signal at speeds as high as 2.5Gbps,

the device accepts a differential PECL clock signal for

data retiming. When LATCH is high, the input data is

synchronized by the clock signal. When LATCH is low,

the input data is directly applied to the output stage.

is shown in Figure 4.

The MAX3869 modulation output is optimized for driv-

ing a 25Ω load; the minimum required voltage at OUT+

is 2.0V. Modulation current swings of 80mA are possi-

ble, but due to minimum power-supply and jitter

requirements at 2.5Gbps, the specified maximum mod-

ulation current is limited to 60mA. To interface with the

laser diode, a damping resistor (R ) is required for

impedance matching. An RC shunt network may also

be necessary to compensate for the laser-diode para-

sitic inductance, thereby improving the optical output

aberrations and duty-cycle distortion.

The output stage is composed of a high-speed differential

pair and a programmable modulation current source.

Since the modulation output drives a maximum current

of 60mA into the laser with an edge speed of 100ps,

large transient voltage spikes can be generated (due to

the parasitic inductance). These transients and the

laser forward voltage leave insufficient headroom for

the proper operation of the laser driver if the modulation

output is DC-coupled to the laser diode. To solve this

problem, the MAX3869’s modulation output is designed

to be AC-coupled to the cathode of a laser diode. An

external pull-up inductor is necessary to DC-bias the

At the data rate of 2.5Gbps, any capacitive load at the

cathode of a laser diode will degrade the optical output

performance. Since the BIAS output is directly connect-

ed to the laser cathode, minimize the parasitic capaci-

tance associated with this pin by using an inductor to

isolate the BIAS pin from the laser cathode.

Automatic Power Control

To maintain constant average optical power, the

MAX3869 incorporates an APC loop to compensate for

the changes in laser threshold current over temperature

and lifetime. A back-facet photodiode mounted in the

modulation output at V . Such a configuration isolates

laser forward voltage from the output circuitry and

_______________________________________________________________________________________

1...4 5 678 9 10...15

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