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PDF CS6706 Data sheet ( Hoja de datos )
| Número de pieza | CS6706 | |
| Descripción | 1.25Gbps Fiber Optic VCSEL/Laser Driver | |
| Fabricantes | Myson Century | |
| Logotipo |  |
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Century Semiconductor Inc.
CS6706
1.25Gbps Fiber-Optic VCSEL/Laser Driver
GENERAL DESCRIPTION
The CS6706 is a high-speed fiber optic VCSEL
driver suited for applications up to 1.25Gbps. The
CS6706 accepts differential PECL inputs, and
includes a CMOS disable pin for bias and modulation
current control. Further, the bias and modulation
current can be set independently via two external
resistors, and the rise/fall time can also be adjusted
using external resistors.
A monitor photodiode can be incorporated in the
application circuit to ensure a stable laser power
source. Any failure of the laser is detected using the
two on-chip window comparators. Once a failure is
detected, the laser power safety switch will be
triggered and can only be reset by a power off
condition.
The slow start feature allows bias current to settle
before modulation current output begins, to protect
the laser.
FEATURES
• Rise/fall time < 200ps, ideally suited for application
up to 1.25Gbps.
• Independently programmable laser bias and mod-
ulation current: bias current to 60mA and modula-
tion current to 45mA.
• Differential PECL inputs.
• Automatic laser power control with monitor circuit.
• Slow start and safety switch.
• Laser failure indication.
• Programmable rise/fall time.
• Supports both 3.3 and 5 Volt operation.
• Available as die or TSSOP-20 package.
APPLICATIONS
• FDDI
• Fiber Channel 100
• SONET OC-12/OC-24
• Fast Ethernet
• Gigabit Ethernet
• VCSEL Driver Transmitters
BLOCK DIAGRAM
DINN
DINP
PREDRIVER
ROFS
RISE/FALL SET
OUTPUT DRIVER
IXMT
MODP
MODN
RMOD
RDCB
BASFB
RPIN
VERF
START
DISABLE
MODULATION SET
BIAS SET
IBIAS
DCBIAS
DRIVER
CURRENT
AMPLIFIER
AUTO POWER SET
DELAY
START
BANDGAP
CONTROL LOGIC
FAILTGR
VDD-1.6V
VDD-2.4V
BUFFER
CS6706
DCB
PIN
FAIL
Century Semiconductor, Inc.
Taiwan:
Nwow. 2w, I.nDduasttray SEahset Redt.43Urd.,com
Science-Based Industrial Park, Hsin-Chu, Taiwan
Tel: 886-3-5784866 Fax: 886-3-5784349
USA:
1485 Saratoga Ave. #200
San Jose, CA, 95129
Tel: 408-973-8388 Fax: 408-973-9388
www.century-semi.com
Rev.1.2 August 2001
page 1 of 8
1 page  
www.DataSheet4U.com
Century Semiconductor Inc.
CS6706
Product description
The CS6706 consists of a laser bias generator with automatic power control, a modulation current driver, and
slow start and safety circuits which shut down laser drive current when a fault is detected.
Laser bias driver and APC
The laser power control function is realized by a feedback loop which sets the average photo-current of a monitor
diode equal to the reference sink current at pin PIN. The precise value is controlled by a resistor, Rpinset which is
connected between pin RPIN and ground.
Setting procedure to APC control loop
Two external resistors Rpinset and Rdcb should be set as following procedures.
(I). Find out desired photo-current (Ipd) generated from monitor diode and associated Bias current (Ibias) from Ibias
V.S. Ipd curve. See Figure 3.
(II). Then Rpinset can be decided as Rpinset = 1.06 / Ipd.
(III). And Rdcb can be decided as Rdcb = 1.06 / [(Ibias/214) - 130µA]
120
100
80
60
40
20
0
0
105
78.6
67.9
59.1
52.555.5
48.9
44.1
39.2
35.3
31.4
26.7
19.7
10.8
5 10 15 20 25 30 35 40 45
Ibias (mA)
Figure-3 Example of Ibias V.S. Ipd curve
Setting without APC control loop
If the automatic power control function is not desired, for example in a VCSEL application, simply replace the
monitor diode by a 18kΩ resistor and disconnect pin RDCB and pin BASFB (please refer to application circuit
schematic). The laser bias current will be
Ibias = 214 / Rdcbset (5V)
Ibias = 210 / Rdcbset (3.3V)
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5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet CS6706.PDF ] | |
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