OPTOELECTRONIC PRODUCTS
PHYSICAL LAYER PRODUCT
VSC7997, VSC7998
10.7 Gb/s Transimpedance Amplifier
V
+5V
500Ω
10kΩ
OFFP
I
IN
OUTP
10kΩ
4.8kΩ
7.2kΩ V
EE
OUTN
OFFN
=0V
CC
F E AT U R E S :
5KW Differential Transimpedance (VSC7997)
1.4KW Differential Transimpedance (VSC7998)
70mA Typical Supply Current
12pA/rtHz Typical Input Noise Current Density
Adjustable Output Offset
Low Group Delay
FBIN
V
EE
= -5.2V
PA D D I A G R A M :
The outputs of the VSC7997 and VSC7998 are linear for inputs up to
250mAp-p and 1000mAp-p respectively. For higher inputs, the output limits at
typically 1000mV differential, increasing the dynamic range of the system by
reducing the possibility of exceeding the input voltage range of the limiting
amplifier or clock and data recovery circuit.
1957µ (77.0mil)
BENEFITS:
High Gain with Low Power
Direct Connection to a Demux without a Post Amplifier
APD or PIN Diode Compatible
1800µ (70.9mil)
Pad 21
GND
Pad 20
FBIN
Pad 19
GND
Pad 18
OFFP
Pad 17
GND
Pad 16
OFFN
Pad 15
GND
Pad 14
GND
Pad 13
GND
Pad 12
OUTP
Pad 11
GND
Pad 10
OUTN
Pad 9
GND
Pad 8
GND
Pad 1
GND
Pad 2
VEE
Pad 3
VEE
Pad 4
VEE
Pad 5
VEE
Pad 6
VEE
Pad 7
GND
A P P L I C AT I O N S :
SONET/SDH Networking
Transponder Modules
DWDM Systems
G.975/709 Forward Error Correction (FEC)
Gigabit Ethernet
Telecommunications Transmission Systems
Test Equipment
1957µ
(77.0mil)
Pad 22
GND
Pad 23
GND
Pad 24
GND
Pad 25
IIN
Pad 26
GND
Pad 27
GND
Pad 28
GND
Top View
PB-VSC7997/7998-002
VSC7997, VSC7998
10.7 Gb/s Transimpedance Amplifier
GENERAL DESCRIPTIONS
S P E C I F I C AT I O N S :
Single -5.2V Power Supply
2.2mAp-p Input Overload
Operating Temperature: -20C to +100C Junction
Die Size: 1.957 mm x 1.957 mm
The VSC7997 and VSC7998 are 10.7Gb/s high performance transim-pedance
amplifiers designed for use in optical communication networks including Sonet
OC-192/SDH STM-64 and 10G Ethernet fiber links. The devices are intended for
use with a photodetector and are capable of amplifying inputs currents of up to
2.2mA with low duty cycle distortion. The VSC7997 and VSC7998 are pin and
functionally compatible. The designer has the flexibility to choose between the
5KW (VSC7997) and the 1.4KW (VSC7998) differential transimpedance as
required by system architecture and performance.
The VSC7997 and VSC7998 amplifier consists of a transimpedance stage and a
single-to-differential output stage with a gain of 20dB and 11.4dB respectively.
An external photodetector is connected to the IIN input. Pins OUTP and OUTN
are the complementary data outputs. The high gain of the VSC7997 allows for a
direct connection to the VSC8174 CRU/Demux without the need for a post
amplifier.
To provide flexibility in setting the decision threshold of the limiting amplifier or
clock and data recovery circuit, the VSC7997 and VSC7998 utilize output offset
control and adjustment of the OUTP and OUTN. Pins FBIN, OFFP, and OFFN are
used for output offset control. The OFFP and OFFN outputs connected to ground
through 100nF capacitors provide the user with the DC component of the OUTP
and OUTN data outputs. An external circuit can be used to sense the OFFP and
OFFN outputs and then generate the appropriate DC voltage at the FBIN input to
set the DC offset between OUTP and OUTN.
For more information on Vitesse Products visit the Vitesse web site
at www.vitesse.com or contact Vitesse Sales at (800) VITESSE
or sales@vitesse.com
741 Calle Plano
Camarillo, CA 93012
Tel: 805.388.3700
Fax: 805.388.7565
www.vitesse.com
©2003 Vitesse Semiconductor Corporation
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