LG1627BXC [AGERE]

LG1627BXC Clocked Laser Driver; LG1627BXC时钟控制激光驱动器


型号：	LG1627BXC
厂家：	AGERE SYSTEMS
描述：	LG1627BXC Clocked Laser Driver LG1627BXC时钟控制激光驱动器驱动器时钟
文件：	总10页 (文件大小：545K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

Data Sheet

May 2001

LG1627BXC Clocked Laser Driver

Features

Functional Description

■ High data-rate clocked laser diode driver

■ Clock disable mode for data feedthrough

■ Adjustable high output current

The LG1627BXC is a gallium arsenide (GaAs) laser

diode driver to be used with direct modulated laser

diodes in high-speed non-return-to-zero (NRZ) trans-

mission systems. The device is made in a high-

performance 0.9 µm gate GaAs hetero-junction FET

technology that utilizes high-density MIM capacitors,

airbridge interconnect, and NiCr film precision resis-

tors. The driver includes differential data and clock

inputs. The high-output, low overshoot drive current

and prebias can be set separately. Data retiming is

accomplished by the internal flip-flop, minimizing

jitter on the data. Clocking can be disabled for data

feedthrough. A pulse-width control enables the user

to compensate for laser turn-on delay. A 2.5 V band-

gap reference is required for stable operation over

temperature and varying power supply voltage.

■ Operation up to 3 Gbits/s

Applications

■ SONET/SDH transmission systems

■ SONET/SDH test equipment

■ Optical transmitters

Functional Diagram

GND

BG2P5

V^TH

V^PRE

I^OUT-PRE

V^IN

I^OUT

CLK

LG1627BXC

V^MOD

V^SS3

V^SS2

V^SS1

CLK_E

MOD_E

PWN

PWP

5-6549(F).b

Figure 1. Functional Diagram

Data Sheet

May 2001

LG1627BXC Clocked Laser Driver

Block Diagram

CLK_E

PWP PWN

GND

MK MK VMOD VPRE

IOUT-PRE

VTH

Ω

IOUT

Ω

GND

VIN

Ω

CLK

Ω

BG2P5

VSS1

MOD_E

VSS3

VSS2

5-7675(F)r.1

Figure 2. Block Diagram

Agere Systems Inc.

Data Sheet

May 2001

LG1627BXC Clocked Laser Driver

Pin Information

24 23 22 21 20 19

V^TH

V^IN

V^PRE

I^OUT-PRE

I^OUT

V^IN

GND

CLK

I^OUT

GND

CLK

9 10 11 12

5-6551(F).br.3

Figure 3. Pin Diagram

Table 1. Pin Descriptions

Symbol

Description

Capacitor to ground (data input reference).

Data input.

Complementary data input.

4, 13, 14,

package

bottom

GND

Ground. For optimum performance, the package bottom must be soldered to the

ground plane.

CLK

Clock input.

Complementary clock input.

−

BG2P5

MOD_E

PWP

PWN

2.5 V band-gap reference (National Semiconductor* p/n LM4040).

SS1

to enable, float to disable).

Modulation enable (connect to V

Pulse width adjust positive.

Pulse width adjust negative.

Complementary mark density output.

Mark density output.

15, 16

22, 23

OUT

Output modulation current (dc coupled to laser cathode).

Output prebias current.

OUT-PRE

PRE

Prebias control input.

−

SS2

SS3

SS2

SS3

supply 5.2 V for output prebias.

−

supply 5.2 V for output modulation.

MOD

Modulation current control input.

−

SS1

supply 5.2 V.

SS1

CLK_E

Clock enable (connect to V

to enable, float to disable).

* National Semiconductor is a registered trademark of National Semiconductor Corporation.

Agere Systems Inc.

Data Sheet

May 2001

LG1627BXC Clocked Laser Driver

Absolute Maximum Ratings

Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are abso-

lute stress ratings only. Functional operation of the device is not implied at these or any other conditions in excess

of those given in the operational sections of the data sheet. Exposure to absolute maximum ratings for extended

periods can adversely affect device reliability.

Table 2. Absolute Maximum Ratings

Parameter

Supply Voltage

Symbol

Min

Max

Unit

VSS

—

GND

—

–5.7

VSS

Input Voltage

Power Dissipation

Tstg

°C

Storage Temperature

Operating Case Temperature Range

−40

125

100

Recommended Operating Conditions

Table 3. Recommended Operating Conditions

Parameter

Case Temperature

Power Supply

Symbol

tCASE

VSS

Min

Max

Unit

°C

–4.7

–5.7

Handling Precautions

Although protection circuitry has been designed into this device, proper precautions should be taken to avoid expo-

sure to electrostatic discharge (ESD) during handling and mounting. Lucent employs a human-body model (HBM)

and a charged-device model (CDM) for ESD-susceptibility testing and protection design evaluation. ESD voltage

thresholds are dependent on the circuit parameters used to define the model. No industry-wide standard has been

adopted for the CDM. However, a standard HBM (resistance = 1500 Ω, capacitance = 100 pF) is widely used and,

therefore, can be used for comparison. The HBM ESD threshold presented here was obtained by using these cir-

cuit parameters.

Table 4. ESD Threshold Voltage

Human-Body Model ESD Threshold

Device

Voltage

LG1627BXC

>200

Mounting and Connections

Certain precautions must be taken when using solder. For installation using a constant temperature solder, temper-

atures of under 300 °C may be employed for periods of time up to 5 seconds, maximum. For installation with a sol-

dering iron (battery operated or nonswitching only), the soldering tip temperature should not be greater than

300 °C and the soldering time for each lead must not exceed 5 seconds. This device is supplied with solder on the

back of the package. For optimum performance, it is recommended to solder the back of the package to ground.

Agere Systems Inc.

Data Sheet

May 2001

LG1627BXC Clocked Laser Driver

Electrical Characteristics (TA = 25 °C, VSS1 = VSS2 = VSS3 = –5.2 V, data input = 600 mV (single ended),

and RL = 50 Ω)

Minimum and maximum values are testing requirements. Typical values are characteristics of the device and are

the result of engineering evaluations. Typical values are for information purposes only and are not part of the test-

ing requirements. Stresses in excess of the absolute maximum ratings can cause permanent damage to the

device.

Table 5. Electrical Characteristics

Parameter

Symbol

Min

Typ

Max

Unit

Data Input Voltage, Single Ended

Power Supply Voltage

Power Supply Current¹

300

600

1000

SS1

SS2

SS3

, V

–

4.9

100

–

5.5

160

, V

5.2

SS1

140

—

MOD

–

5.5

Voltage Control for Output Modulation Current

Output Minimum Modulation Current

Output Maximum Modulation Current²

Voltage Control for Prebias Current

Output Minimum Prebias Current

Output Maximum Prebias Current³

4.0

OUT LOW

—

OUT HIGH

—

PRE

–

3.0

5.5

0.5

—

PRE LOW

—

PRE HIGH

—

Ω

–

—

Mark Density, 50% Duty Cycle (1 k to GND)

0.5

—

–

—

Mark Density Complement, 50% Duty Cycle

Ω

(1 k to GND)

–

Pulse Width Adjust Plus

PWP

PWN

3.0

4.2

5.5

–

5.5

Pulse Width Adjust Negative

OUT

Output Modulation I

= 40 mA, Clock Enabled

—

Output Rise and Fall Times (20% 80%)

t , t

—

Jitter (rms)

Phase Margin

270

deg

OUT

Output Modulation I

= 40 mA, Clock Disabled

—

Output Rise and Fall Times (20% 80%)

Jitter (rms)

t , t

—

OUT

Output Modulation I

= 80 mA, Clock Enabled

—

t , t

—

Output Rise and Fall Times (20% 80%)

Jitter (rms)

100

—

Phase Margin

270

deg

OUT

Output Modulation I

= 80 mA, Clock Disabled

—

Output Rise and Fall Times (20% 80%)

Jitter (rms)

t , t

100

—

1. Excludes I^PREand average I^MOD.

Power supply current I^SS2(relating to prebias) is dependent on V^PRE.

Power supply current I^SS3(relating to modulation) is dependent on V^MOD.

2. Maximum modulation at maximum V^MOD.

3. Maximum prebias at maximum V^PRE.

Agere Systems Inc.

Data Sheet

May 2001

LG1627BXC Clocked Laser Driver

Typical Optical Evaluations and Performance Characteristics

V^SS= –5.2 V

CLK_E

0.1 µF

24 23 22 21 20 19

D2500

LASER

2000

V^TH

0.1 µF

I^OUT-PRE

I^OUT

DATA

Zo = 50 Ω

V^IN

LASER

RF INPUT

dc BIAS

LG1627BXC

CLOCKED LASER

DRIVER

0.047 µF

V^{IN (OPTIONAL)}

Zo = 25 Ω

CLOCK

Zo = 50 Ω

CLK

CLK ^(OPTIONAL)

0.047 µF

10 11 12

BG2P5

VOLTAGE

5 kΩ

DIVIDER

LM4040

V^SS

2 kΩ

V^SS= –5.2 V

V^SS

BYPASS

CURRENT

SENSE

FOR V^SS1

TO USER

VOLTAGE MONITOR

(DVM)

3 kΩ

0.1 µF

1 Ω

V^SS

REQUIRED TO SET

0.1 µF

V^MODAND V^PRE

TO NODE

V^SS2AND V^SS3

ONE EACH

V^SS1

TO ACHIEVE DESIRED

MODULATION AND PREBIAS

5-7693(F)r.4

Notes:

All bypass capacitors should be mounted close to the package.

For optimum performance, the package must be soldered to ground.

Ω

Mark density (MK and MK) outputs are terminated with 1 k pull-up resistors.

Ω

For single-ended operation, unused data and clock inputs should be ac coupled to a 50 termination.

Pin 13 and pin 14 should be tied together with a separate path to the ground plane.

Figure 4. Typical Optical Evaluation of the LG1627BXC and D2500 Laser

Agere Systems Inc.

Data Sheet

May 2001

LG1627BXC Clocked Laser Driver

Typical Optical Evaluations and Performance Characteristics (continued)

HORIZONTAL: 60 ps/div, VERTICAL: 1.5 mW/div

Figure 5. Typical Optical Eye-Diagram IOUT = 85 mA; IOUT-PRE = 5 mA

100

–5.5

–5.0

–4.5

–4.0

V^MOD(V)

5-7676(F)

Figure 6. Typical IOUT vs. VMOD

–5.5

–5.0

–4.5

–4.0

–3.5

V^PRE(V)

5-7677(F)r.1

Figure 7. Typical IOUT-PRE vs. VPRE

Agere Systems Inc.

Data Sheet

May 2001

LG1627BXC Clocked Laser Driver

Outline Diagram

0.465

0.280

0.012

0.030

0.082

0.005

0.092

0.045

0 — 0.004

0.035

5-6555(F).a

Assembly Notes:

Standoff specifications apply to package prior to solder dipping of leads and package base.

During board assembly, use back lighting to silhouette the package. This will eliminate reflection problems with the solder on the

bottom of the package.

Lead space tolerance should be set to ±0.012”.

Board solder pattern for the package base should not exceed 50% of the package base area.

Insertion pressure should not exceed 125 grams.

Ordering Information

Device Code

Package

Temperature

Comcode

(Ordering Number)

LG1627BXC

24-pin hermetic small outline

0 °C to 70 °C

108325754

Agere Systems Inc.

Data Sheet

May 2001

LG1627BXC Clocked Laser Driver

Notes

Agere Systems Inc.

Data Sheet

May 2001

LG1627BXC Clocked Laser Driver

For additional information, contact your Agere Systems Account Manager or the following:

INTERNET:

E-MAIL:

http://www.agere.com

docmaster@micro.lucent.com

N. AMERICA: Agere Systems Inc., 555 Union Boulevard, Room 30L-15P-BA, Allentown, PA 18109-3286

1-800-372-2447, FAX 610-712-4106 (In CANADA: 1-800-553-2448, FAX 610-712-4106)

ASIA PACIFIC: Agere Systems Singapore Pte. Ltd., 77 Science Park Drive, #03-18 Cintech III, Singapore 118256

Tel. (65) 778 8833, FAX (65) 777 7495

CHINA:

Agere Systems (Shanghai) Co., Ltd., 33/F Jin Mao Tower, 88 Century Boulevard Pudong, Shanghai 200121 PRC

Tel. (86) 21 50471212, FAX (86) 21 50472266

JAPAN:

Agere Systems Japan Ltd., 7-18, Higashi-Gotanda 2-chome, Shinagawa-ku, Tokyo 141, Japan

Tel. (81) 3 5421 1600, FAX (81) 3 5421 1700

EUROPE:

Data Requests: DATALINE: Tel. (44) 7000 582 368, FAX (44) 1189 328 148

Technical Inquiries: GERMANY: (49) 89 95086 0 (Munich), UNITED KINGDOM: (44) 1344 865 900 (Ascot),

FRANCE: (33) 1 40 83 68 00 (Paris), SWEDEN: (46) 8 594 607 00 (Stockholm), FINLAND: (358) 9 3507670 (Helsinki),

ITALY: (39) 02 6608131 (Milan), SPAIN: (34) 1 807 1441 (Madrid)

Agere Systems Inc. reserves the right to make changes to the product(s) or information contained herein without notice. No liability is assumed as a result of their use or application.

Printed in U.S.A.

May 2001

DS01-219HSPL (Replaces DS99-143HSPL)

LG1627BXC [AGERE]

相关型号：

LG1628AXA

LG16M10K0BP342040

LG16M10K0BP342525

LG16M15K0BP442240

LG16M18K0BPF-2245

LG16M27K0BP443040

LG16M27K0BP443530

LG16M33K0BP343045

LG170Z

LG171

LG1740

LG180M0180BPF-2220