ADN2848

更新时间： 2024-01-15 09:21:35

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
页数	文件大小	规格书
12页	255K
描述
3 V Dual-Loop 50 Mbps to 1.25 Gbps Laser Diode Driver

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技术参数
数据手册

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ADN2848 技术参数

是否无铅：	含铅	是否Rohs认证：	不符合
生命周期：	Obsolete	零件包装代码：	QFN
包装说明：	QCCN, LCC32,.2SQ,20	针数：	32
Reach Compliance Code：	not_compliant	风险等级：	5.67
接口集成电路类型：	INTERFACE CIRCUIT	JESD-30 代码：	S-XQCC-N32
JESD-609代码：	e0	长度：	5 mm
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：	QCCN
封装等效代码：	LCC32,.2SQ,20	封装形状：	SQUARE
封装形式：	CHIP CARRIER	峰值回流温度（摄氏度）：	NOT SPECIFIED
电源：	3.3 V	认证状态：	Not Qualified
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：	Tin/Lead (Sn/Pb)	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

ADN2848 数据手册

ADN2848

Monitor Currents

CCBIAS

IBMON, IMMON, and IMPDMON are current controlled

current sources from V_CC. They mirror the bias, modulation,

and MPD current for increased monitoring functionality. An

external resistor to GND gives a voltage proportional to the

current monitored.

When the laser is used in ac-coupled mode, the CCBIAS and

the I_BIASpins should be tied together (see Figure 7). In dc-

coupled mode, CCBIAS should be tied to V_CC

Automatic Laser Shutdown

The ADN2848 ALS allows compliance to ITU-T-G958 (11/94),

section 9.7. When ALS is logic high, both bias and modulation

currents are turned off. Correct operation of ALS can be con-

firmed by the FAIL alarm being raised when ALS is asserted.

Note that this is the only time that DEGRADE will be low

while FAIL is high.

If the monitoring function IMPDMON is not required, the

IMPD pin must be grounded and the monitor photodiode

output must be connected directly to the PSET pin.

Data and Clock Inputs

Data and clock inputs are ac-coupled (10 nF capacitors recom-

mended) and terminated via a 100 Ω internal resistor between

DATAP and DATAN and also between the CLKP and CLKN

pins. There is a high impedance circuit to set the common-

mode voltage, which is designed to allow for maximum input

voltage headroom over temperature. It is necessary that ac

coupling be used to eliminate the need for matching between

common-mode voltages.

Alarm Interfaces

The FAIL and DEGRADE outputs have an internal 30 kΩ pull-

up resistor that is used to pull the digital high value to V_CC

However, the alarm output may be overdriven with an external

resistor allowing alarm interfacing to non-V_CClevels. Non-V_CC

alarm output levels must be below the V_CCused for the

ADN2848.

Power Consumption

The ADN2848 die temperature must be kept below 125^oC. The

LFCSP package has an exposed paddle. The exposed paddle

should be connected in such a manner that it is at the same

potential as the ADN2848 ground pins. The θ_JAfor the package

is shown under the Absolute Maximum Ratings. Power con-

sumption can be calculated using

ADN2848

DATAP

(TO FLIP-FLOPS)

DATAN

50ꢃ 50ꢃ

REG

_CC= I_CCMIN+ 0.3 I_MOD

R = 2.5kꢃ, DATA

R = 3kꢃ, CLK

P = V_CCꢂ I_CC+ (I_BIASꢂ V_{BIAS_PIN}) + I_MOD(V_{MODP_PIN}

V_{MODN_PIN})/2

400ꢀATYP

_DIE= T_AMBIENT+ θ_JAꢂ P

Thus, the maximum combination of I_BIAS+ I_MODmust be calcu-

lated. Where:

Figure 3. AC Coupling of Data Inputs

I_CCMIN

= 50 mA, the typical value of I_CCprovided on Page 2

For input signals that exceed 500 mV p-p single-ended, it is

necessary to insert an attenuation circuit as shown in Figure 4.

with I_BIAS= I_MOD= 0

_DIE= die temperature

_AMBIENT= ambient temperature

ADN2848

DATAP/CLKP

DATAN/CLKN

_{BIAS_PIN}= voltage at I_BIASpin

_{MODP_PIN}= average voltage at IMODP pin

_{MODN_PIN}= average voltage at IMODN pin

Laser Disode Interfacing

NOTETHAT R = 100ꢃ =THE DIFFERENTIAL

Many laser diodes designed for 1.25 Gbps operation are pack-

aged with an internal resistor to bring the effective impedance

up to 25 Ω in order to minimize transmission line effects. In

high current applications, the voltage drop across this resistor,

combined with the laser diode forward voltage, makes direct

connection between the laser and the driver impractical in a 3 V

system. AC coupling the driver to the laser diode removes this

headroom constraint.

INPUT IMPEDANCE OFTHE ADN2848

Figure 4. Attenuation Circuit

–6–

REV. 0

1...3 4 567 8 9...12

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ADN2848ACP-32	ADI	3 V Dual-Loop 50 Mbps to 1.25 Gbps Laser Diode Driver	获取价格
ADN2848ACP-32-RL	ADI	3 V Dual-Loop 50 Mbps to 1.25 Gbps Laser Diode Driver	获取价格
ADN2848ACP-32-RL7	ADI	3 V Dual-Loop 50 Mbps to 1.25 Gbps Laser Diode Driver	获取价格
ADN2848ACPZ-32	ROCHESTER	SPECIALTY INTERFACE CIRCUIT, QCC32, 5 X 5 MM, MO-220-VHHD-2, LFCSP-32	获取价格
ADN2848ACPZ-32-RL7	ROCHESTER	SPECIALTY INTERFACE CIRCUIT, QCC32, 5 X 5 MM, MO-220-VHHD-2, LFCSP-32	获取价格
ADN2848ACPZ-32-RL7	ADI	3.3 V Dual-Loop 50 Mbps to 1.25 Gbps Laser Diode Driver	获取价格

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