VSC7984
Datasheet
Downloaded by pm_virendrakumar@yahoo.com on April 8, 2007 from Vitesse.com
12.5 Gbps Electroabsorption Modulator Driver
F
EATURES
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A
PPLICATIONS
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5 V or –5.2 V power supply operation
Selectable data retiming
AC-coupled inputs
Internally-stabilized modulation and bias outputs
Excellent output return loss
300 mV differential input sensitivity
Programmable output data eye crossing point
2.5 V on-chip voltage reference
On-chip temperature monitor
Output Enable
SONET OC-192 and SDH STM-64 transmission
systems up to 12.5 Gbps
10 Gigabit Ethernet (GbE) modules
Very Short Reach (VSR) modules
Fiber optic transponder and transceiver modules
SONET/SDH test equipment
G
ENERAL
D
ESCRIPTION
The VSC7984 is a 12.5 Gbps electroabsorption modulator (EAM) driver for SONET/SDH and 10 GbE applications.
It provides selectable data retiming to improve jitter performance and controls for output bias voltage, modulation
voltage, and duty cycle. Internal operational amplifiers and an on-chip voltage reference preclude the need for
additional off-chip circuitry to stabilize modulation and offset voltages. A temperature-monitor output reflects the
internal device temperature to simplify testing and to verify that the device is not being operated beyond its
recommended maximum temperature.
The VSC7984 is available in a 24-pin, plastic quad flat no-lead (QFN) package. The device is also available in a
lead(Pb)-free package, VSC7984XYF.
V
CC
50
Ω
DATA
50
Ω
50
Ω
50
Ω
OUT
DCC
DATAN
V
CC
Retimer
OUTN
CLK
CLKN
CSEL
PW
Control Circuitry
VMOD
VOFS
VEE
VREF
VTEMP
ENABLE
Figure 1. VSC7984 Block Diagram
1 of 16
VMDS-10029 Revision 4.1
January 19, 2007
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