Datasheet > MAX3869EHJ+T

MAX3869EHJ+T

更新时间： 2024-10-28 19:58:35

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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技术参数
数据手册
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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

should equal 25Ω. Typical values for R are 18Ω to

Calculating Power Consumption

The junction temperature of the MAX3869 dice must be

kept below +150°C at all times. The total power dissipa-

tion of the MAX3869 can be estimated by the following:

23Ω. For best performance, a bypass capacitor (0.01µF

typical) should be placed as close as possible to the

anode of the laser diode. Depending on the exact char-

acteristics of the laser diode and PC board layout, a

P = V

✕ I

+ (V

- V ) ✕ I

BIAS

resistor (R ) of 20Ω to 70Ω in parallel with pull-up induc-

tor L can be useful in damping overshoot and ringing

+ I

- 25Ω ✕ I

/ 2)

MOD CC

MOD

in the optical output.

where I

MAX MOD

cal laser forward voltage.

is the maximum bias current set by R

BIAS-

BIAS

In some applications (depending on laser-diode para-

sitic inductance characteristics), an RC shunt network

between the laser cathode and ground will help mini-

mize optical output aberrations. Starting values for most

coaxial lasers are R = 75Ω in series with C = 3.3pF.

These values should be experimentally adjusted until

the optical output waveform is optimized.

, I

is the modulation current, and V is the typi-

Junction Temperature = P(W) ✕ 45 (°C/W)

___________Applications Information

An example of how to set up the MAX3869 follows.

Select Laser

A communication-grade laser should be selected for

2.488Gbps applications. Assume the laser output aver-

Pattern-Dependent Jitter

When transmitting NRZ data with long strings of con-

secutive identical digits (CIDs), LF droop can occur

and contribute to pattern-dependent jitter (PDJ). To

minimize this PDJ, three external components must be

age power is P

= 0dBm, minimum extinction ratio is

AVG

r = 6.6 (8.2dB), the operating temperature is -40°C to

+85°C, and the laser diode has the following character-

istics:

properly chosen: capacitor C

, which dominates the

APC

APC loop time constant; pull-up inductor L ; and AC-

coupling capacitor C .

Wavelength:

λ = 1.3µm

To filter out noise effects and guarantee loop stability,

Threshold Current:

= 22mA at +25°C

the recommended value for C

is 0.1µF. This results

APC

Threshold Temperature

Coefficient:

in an APC loop bandwidth of 10kHz or a time constant

of 16µs. As a result, the PDJ associated with an APC

loop time constant can be ignored.

= 1.3%/°C

= 0.2A/W

Laser to Monitor Transfer:

Laser Slope Efficiency:

MON

η = 0.05mW/mA

at +25°C

The time constant associated with the output pull-up

inductor (L ≈ L ), and the AC-coupling capacitor (C )

will also impact the PDJ. For such a second-order net-

work, the PDJ due to the low frequency cutoff will be

Determine R

APCSET

The desired monitor diode current is estimated by

dominated by L . For a data rate of 2.5Gbps, the rec-

= P

= 200µA. The I

vs. R

MD APCSET

AVG

MON

ommended value for C is 0.056µF. During the maxi-

graph in the Typical Operating Characteristics shows

that R should be 6.0kΩ.

mum CID period it is recommended to limit the peak

APCSET

voltage droop to less than 12% of the average (6% of

the amplitude). The time constant can be estimated by:

Determine R

MODSET

-t

τ_L

To achieve a minimum extinction ratio (r ) of 6.6 over

12% = 1 - e

temperature and lifetime, calculate the required extinc-

τ_LP= 7.8t

tion ratio at +25°C. Assuming r = 20, the peak-to-peak

optical power P

= 1.81mW, according to Table 1. The

p-p

If τ_LP= L / 25Ω, and t = 100UI = 40ns, then L = 7.8µH.

required modulation current is 1.81(mW) / 0.05(mW/mA)

= 36.2mA. The I vs. R graph in the Typical

To reduce the physical size of this element (L ), use of

SMD ferrite beads is recommended (Figure 2).

MOD

MODSET

Operating Characteristics shows that R

be 4.8kΩ.

should

MODSET

Input Termination Requirement

The MAX3869 data and clock inputs are PECL compat-

ible. However, it is not necessary to drive the MAX3869

with a standard PECL signal. As long as the specified

common-mode voltage and the differential voltage

swings are met, the MAX3869 will operate properly.

10 ______________________________________________________________________________________

1...7 8 91011 12 13...15

中文翻译

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MAX3869EHJ+T 替代型号

型号	品牌	替代类型	描述	数据表
MAX3869EHJ+	MAXIM	完全替代	Interface Circuit, PQFP32, 5 X 5 MM, 1 MM HEIGHT, ROHS COMPLIANT, MS-026AAA-HD, TQFP-32
MAX3869EGJ-T	MAXIM	类似代替	Interface Circuit, 5 X 5 MM, 0.90 MM HEIGHT, MO-220, QFN-32

与MAX3869EHJ+T相关器件

型号	品牌	获取价格	描述	数据表
MAX3869EVKIT	MAXIM	获取价格	Evaluation Kit for the MAX3869
MAX3872	MAXIM	获取价格	Multirate Clock and Data Recovery with Limiting Amplifier
MAX3872_V01	MAXIM	获取价格	Multirate Clock and Data Recovery with Limiting Amplifier
MAX3872AETJ+	MAXIM	获取价格	Clock Recovery Circuit, 1-Func, Bipolar, 5 X 5 MM, 0.90 MM HEIGHT, ROHS COMPLIANT, QFN-32
MAX3872AETJ+T	MAXIM	获取价格	暂无描述
MAX3872EGJ	MAXIM	获取价格	Multirate Clock and Data Recovery with Limiting Amplifier
MAX3872EGJ+	MAXIM	获取价格	ATM/SONET/SDH Clock Recovery Circuit, Bipolar, PQCC32,
MAX3872EGJ-T	MAXIM	获取价格	Clock Recovery Circuit, 1-Func, Bipolar, 5 X 5 MM, 0.90 MM HEIGHT, MO-220, QFN-32
MAX3872ETJ+	MAXIM	获取价格	Clock Recovery Circuit, 1-Func, Bipolar, 5 X 5 MM, 0.80 MM HEIGHT, LEAD FREE, MO-220-WHHD-
MAX3872ETJ+T	MAXIM	获取价格	暂无描述

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