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Электронный компонент: ATA30013D1C

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08/2001
ATA30013
Transimpedance Amplifier
SONET OC- 48
PRELIMINARY DATA SHEET - Rev 2
FEATURES
3K W Transresistance
Low Noise: < 3pA/ Hz
2 GHz Analog Bandwidth
Wide Dynamic Range
Good Sensitivity and High Bit Rates
Low Distortion
APPLICATIONS
SONET OC-48 /SDH STM-16 (2.488 Gb/s)
Receiver
Wideband Gain Block
Low Noise RF Amplifier
D1
Die Package
GND
Iin
Av= - 60
15
3K
Vdd
Vss
Vout
GND
or
Neg. Supply
0.8
Figure 1: Pad Description
PRODUCT DESCRIPTION
The ANADIGICS ATA30013 is a
5V high speed, low
noise transimpedance amplifier designed to be used
in OC-48/STM-16 fiber optic links. The device is used
in conjunction with a photodetector (PIN diode or
avalanche photodiode) to convert an optical signal
into an output voltage. The ATA30013 offers a band-
width of 2GHz and a wide linear range of operation. It
is manufactured in a GaAs MESFET process and is
available in bare die form.
:
:
GND
OUT
V
SS
V
DD3
V
DD2
V
DD1
BY1
BY2
IN
ANADIGICS
GND
PRELIMINARY DATA SHEET - Rev 2
08/2001
2
ATA30013
:
:
GND
OUT
V
SS
V
DD3
V
DD2
V
DD1
BY1
BY2
IN
ANADIGICS
1375
m
1525
m
GND
Figure 2: Bond Pad Layout
Table 2: Absolute Maximum Ratings
Table 1: Pad Description
ELECTRICAL CHARACTERISTICS
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Stresses in excess of the absolute ratings may cause
permanent damage. Functional operation is not implied
under these conditions. Exposure to absolute ratings
for extended periods of time may adversely affect
reliability.
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PRELIMINARY DATA SHEET - Rev 2
08/2001
3
ATA30013
Electrical Specifications: (TA = 25
o
C, Vdd = + 5 V, Vss = - 5V, Cdiode + Cstray = 0.4 pF)
Table 3: DC Electrical Specifications
Table 4: AC Electrical Specifications
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PRELIMINARY DATA SHEET - Rev 2
08/2001
4
ATA30013
Figure 3: Bonding Diagram
:
:
GND
OUT
V
SS
V
DD3
V
DD2
V
DD1
BY1
BY2
IN
ANADIGICS
GND
V
DD
56pF
56pF
56pF
56pF
V
SS
GND
PHOTO-
DETECTOR
OUT
PRELIMINARY DATA SHEET - Rev 2
08/2001
5
ATA30013
V
out
Connection
The output pad should be connected via a coupling
capacitor to the next stage of the receiver ( filter or
decision circuits), as the output buffers are not
designed to drive a DC coupled 15 ohm load. If V
out
is
connected to a high input impedance decision circuit
(>500W), then a coupling capacitor may not be
required, although caution should be exercised since
DC offsets of the photo detector/TIA combination may
cause clipping of subsequent gain or decision
circuits.
Power Supplies And General Layout
Considerations
The ATA30013 may be operated from a positive
supply as low as + 4.5 V and as high as + 6.0 V.
Below + 4.5 V, bandwidth and sensitivity will degrade,
while at + 6.0 V, bandwidth, and sensitivity improve.
The device is much less sensitive to the same
changes in Vss. Use of surface mount (preferably
MIM type capacitors), low inductance power supply
bypass capacitors (>=56pF) are essential for good
high frequency and low noise performance. The
power supply bypass capacitors should be mounted
on or connected to a good low inductance ground
plane.
General Layout Considerations
Since the gain stages of the transimpedance
amplifier have an open loop bandwidth in excess of
2.0 GHz, it is essential to maintain good high
frequency layout practices. To prevent oscillations, a
low inductance RF ground plane should be made
available for power supply bypassing. Traces that
can be made short should be made short, and the
utmost care should be taken to maintain very low
capacitance at the photodiode-TIA interface (I
in
), as
excess capacitance at this node will cause a
degradation in bandwidth and sensitivity.
Sensitivity and Bandwidth
In order to guarantee sensitivity and bandwidth
performance, the TIA is subjected to an extensive
series of tests at the die sort level (100% testing at
25
o
C) to verify the DC parametric performance and
the high frequency performance (i.e. adequate
S21) of the amplifier. Acceptably high S21of the
internal gain stages will ensure low amplifier input
capacitance, and hence, low input reference noise
current. Transimpedance sensitivity and bandwidth
are then guaranteed by design and correlation with
RF and DC die sort test results.
APPLICATION INFORMATION
PRELIMINARY DATA SHEET - Rev 2
08/2001
6
ATA30013
NOTES
PRELIMINARY DATA SHEET - Rev 2
08/2001
7
ATA30013
NOTES
PRELIMINARY DATA SHEET - Rev 2
08/2001
8
IMPORTANT NOTICE
ANADIGICS, Inc. reserves the right to make changes to its products or to discontinue any product at any time without
notice. The product specifications contained in Advanced Product Information sheets and Preliminary Data Sheets are
subject to change prior to a products formal introduction. Information in Data Sheets have been carefully checked and are
assumed to be reliable; however, ANADIGICS assumes no responsibilities for inaccuracies. ANADIGICS strongly urges
customers to verify that the information they are using is current before placing orders.
WARNING
ANADIGICS products are not intended for use in life support appliances, devices, or systems. Use of an ANADIGICS
product in any such application without written consent is prohibited.
ANADIGICS, Inc.
35 Technology Drive
Warren, New Jersey 07059
Tel: (908) 668-5000
Fax: (908) 668-5132
http://www.anadigics.com
Mktg@anadigics.com
ATA30013
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ORDERING INFORMATION