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PRELIMINARY DATA SHEET - Rev 2 FEATURES * 3K W Transresistance * Low Noise: < 3pA/O 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
VDD1 BY1 VDD2 VDD3
Transimpedance Amplifier SONET OC- 48
ATA30013
BY2:
GND
OUT
IN
VSS
ANADIGICS
: GND
Low Noise RF Amplifier
D1 Die Package
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
Vdd
into an output voltage. The ATA30013 offers a bandwidth of 2GHz and a wide linear range of operation. It is manufactured in a GaAs MESFET process and is available in bare die form.
Vss
3K
Iin
15 Av= - 60 0.8 Vout
GND or Neg. Supply
GND
Figure 1: Pad Description
08/2001
ATA30013
V DD1 BY1
V DD2
VDD3
BY2:
GND
OUT
1375 m
IN
V SS
ANADIGICS
: GND
1525 m
Figure 2: Bond Pad Layout
Table 1: Pad Description
PAD V DD1 V DD2 V DD3 V SS IIN VOUT
D ESC R IPTION Posi ti ve supply voltage Posi ti ve supply voltage Posi ti ve supply voltage Negati ve supply voltage TIA Input C urrent TIA Output Voltage
C OMMEN T
Requi res external D C block
ELECTRICAL CHARACTERISTICS
Table 2: Absolute Maximum Ratings
V DD TA TS
7.0V Operati ng Temp. - 40 C to 125 C Storage Temp. - 65 C to 150 C
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
ATA30013 Table 3: DC Electrical Specifications Electrical Specifications: (TA = 25 oC, Vdd = + 5 V, Vss = - 5V, Cdiode + Cstray = 0.4 pF) D C C H AR AC TER ISTIC S MIN TYP MAX U N IT
Transresi stance (RL = ) Input Impedance Supply C urrent VDD V SS
2.5 70
2.9 50 100 70 10 +0.1
3.2 140 90
KW
W
mA mA mA V
Output D ri ve C urrent Source/Si nk Output Offset Voltage Input Bi as Voltage Operati ng Temperature Range Operati ng Voltage Range VDD V SS - 0.8 0 4.5 -6
- 0.6 5.0 -5
- 0.1 + 85 6.0 -4
V C V V
Table 4: AC Electrical Specifications
AC C H AR AC TER ISTIC S Transresi stance f = 300 MHz RL = 50 W Input C apaci tance 3 dB Bandwi dth Output Impedance Input Noi se C urrent, 150 KHz - 1 GHz 1 GHz - 2.5 GHz Gai n Flatness (150 KHz - 500 MHz) Peaki ng (Relati ve to 100 MHz) Input 1 dB C ompressi on (100 Mb/s) 500 10 MIN 1.4 TYP 1.8 0.6 2 15 165 400 0.5 1.5 600 30 230 600 1 2.5 MAX 2.3 U N IT KW pF GHz
W
nA RMS nA RMS dB dB
m A p-p
PRELIMINARY DATA SHEET - Rev 2 08/2001
3
ATA30013
VDD
56pF
56pF
56pF
VDD1 BY1
VDD2
VDD3
BY2:
GND
OUT
OUT
56pF
VSS
PHOTODETECTOR
IN VSS
ANADIGICS
: GND
GND
Figure 3: Bonding Diagram
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PRELIMINARY DATA SHEET - Rev 2 08/2001
ATA30013
APPLICATION INFORMATION
Vout 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 Vout 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 (Iin), 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 25oC) to verify the DC parametric performance and the high frequency performance (i.e. adequate 1/2S211/2) of the amplifier. Acceptably high 1/2S211/2of 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.
PRELIMINARY DATA SHEET - Rev 2 08/2001
5
NOTES
ATA30013
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PRELIMINARY DATA SHEET - Rev 2 08/2001
ATA30013
NOTES
PRELIMINARY DATA SHEET - Rev 2 08/2001
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ATA30013
ORDERING INFORMATION
Part N umber ATA30013D 1C D1
Package Option Die
Package D escription
ANADIGICS, Inc. 35 Technology Drive Warren, New Jersey 07059 Tel: (908) 668-5000 Fax: (908) 668-5132 http://www.anadigics.com Mktg@anadigics.com
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. PRELIMINARY DATA SHEET - Rev 2 08/2001
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