AD8015 Analog Devices, AD8015 Datasheet

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AD8015

Manufacturer Part Number
AD8015
Description
Wideband/Differential Output Transimpedance Amplifier
Manufacturer
Analog Devices
Datasheet

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a
PRODUCT DESCRIPTION
The AD8015 is a wide bandwidth, single supply transimpedance
amplifier optimized for use in a fiber optic receiver circuit. It is a
complete, single chip solution for converting photodiode current
into a differential voltage output. The 240 MHz bandwidth enables
AD8015 application in FDDI receivers and SONET/SDH
receivers with data rates up to 155 Mbps. This high bandwidth
supports data rates beyond 300 Mbps. The differential outputs
drive ECL directly, or can drive a comparator/ fiber optic post
amplifier.
In addition to fiber optic applications, this low cost, silicon al-
ternative to GaAs-based transimpedance amplifiers is ideal for
systems requiring a wide dynamic range preamplifier or single-
ended to differential conversion. The IC can be used with a
standard ECL power supply (–5.2 V) or a PECL (+5 V) power
supply; the common mode at the output is ECL compatible.
The AD8015 is available in die form, or in an 8-pin SOIC
package.
REV. A
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
FEATURES
Low Cost, Wide Bandwidth, Low Noise
Bandwidth: 240 MHz
Pulse Width Modulation: 500 ps
Rise Time/Fall Time: 1.5 ns
Wide Dynamic Range
Differential Outputs
Low Power: 5 V @ 25 mA
Wide Operating Temperature Range: –40 C to +85 C
APPLICATIONS
Fiber Optic Receivers: SONET/SDH, FDDI, Fibre Channel
Stable Operation with High Capacitance Detectors
Low Noise Preamplifiers
Single-Ended to Differential Conversion
I-to-V Converters
Total Input RMS Noise: 26.5 nA to 100 MHz
Optical Sensitivity: –36 dBm @ 155.52 Mbps
Peak Input Current:
Input Current Noise: 3.0 pA/ Hz @ 100 MHz
350
A
One Technology Way, P.O. Box 9106, Norwood, 02062-9106, U.S.A.
Tel: 617/329-4700
Figure 1. Differential/Single-Ended Transimpedance vs.
Frequency
Figure 2. Noise vs. Frequency (SO-8 Package with
Added Capacitance)
Wideband/Differential Output
25.0E+3
20.0E+3
15.0E+3
10.0E+3
000.E+0
5.0E+3
10.0E+6
5.0
4.5
Transimpedance Amplifier
4.0
3.5
3.0
2.5
2.0
000.0E+0
V
FUNCTIONAL BLOCK DIAGRAM
NC
NC
BYP
I
IN
1
2
3
4
NC = NO CONNECT
AD8015
20.0E+6
G = 30
10k
DIFFERENTIAL
SINGLE-ENDED
1.7V
G = 3
– +
FREQUENCY – Hz
40.0E+6
FREQUENCY – Hz
100.0E+6
+1
+1
+V
1.5pF
S
50
50
60.0E+6
2.0pF
0.5pF
© Analog Devices, Inc., 1996
8
7
6
5
+V
+OUTPUT
–OUTPUT
–V
AD8015
3.0pF
S
S
80.0E+6
1.0pF
Fax: 617/326-8703
100.0E+6
1.0E+9

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AD8015 Summary of contents

Page 1

... The IC can be used with a standard ECL power supply (–5 PECL (+5 V) power supply; the common mode at the output is ECL compatible. The AD8015 is available in die form 8-pin SOIC package. REV. A Information furnished by Analog Devices is believed to be accurate and reliable ...

Page 2

... Maximum Input Current . . . . . . . . . . . . . . . . . . . . . . . . 10 mA Storage Temperature Range . . . . . . . . . . . . – +125 C Operating Temperature Range ( MIN AD8015ACHIP/ – +85 C Maximum Junction Temperature . . . . . . . . . . . . . . . . . +165 C Lead Temperature Range (Soldering 10 sec +300 C CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. ...

Page 3

... MIN frequency in Hz. PHOTODIODE REFERRED TO POSITIVE SUPPLY Figure 3 shows the AD8015 used in a circuit where the photo- diode is referred to the positive supply. The back bias voltage on the photodiode is 1.8 V. This method of referring the photo- diode provides greater power supply noise immunity (PSRR) than referring the photodiode to the negative supply ...

Page 4

... Sensitivity (minimum power level) = 541/0. 637 nW (peak) = –32.0 dBm (peak) = –35.0 dBm (average) The SONET OC-3 specification allows for a minimum power level of –31 dBm peak, or –34 dBm average. Using the AD8015 provides 1 dB margin. FDDI SENSITIVITY ANALYSIS FDDI Minimum Bandwidth = 0.7 88 MHz Total Current Noise ...

Page 5

... 100 10 Figure 10. Group Delay vs. Frequency 9.0 8.5 8.0 7.5 7.0 6.5 6.0 5.5 5 10.0E+6 Figure 11. Differential Gain vs. Supply –5– AD8015 +85 C –40 C AND OUT IN 50 AD8015 1000 10 100 FREQUENCY – MHz Figure 9. Gain vs. Frequency 5V, +25 C 100 1000 FREQUENCY – MHz 11.0V 5.0V 4.5V 100.0E+6 1.0E+9 FREQUENCY – Hz ...

Page 6

... Figure 14. Differential Gain vs. Input Capacitance APPLICATION 155 Mbps Fiber Optic Receiver The AD8015 and AD807 can be used together for a complete 155 Mbps Fiber Optic Receiver (Transimpedance Amplifier, Post Amplifier with Signal Detect Output, and Clock Recovery and Data Retiming) as shown in Figure 16. ...

Page 7

... ALL CAPS ARE CHIP, 15pF ARE MICA. 2. 150 nH ARE SMT CONNECT Figure 16. 155 Mbps Fiber Optic Receiver Schematic Table I. AD8015, AD807 Fiber Optic Receiver Circuit: Output Bit Error Rate & Output Jitter vs. Average Input Power Average Optical Input Power (dBm) –6.4 – ...

Page 8

... AD8015 AC COUPLED PHOTODIODE APPLICATION FOR IMPROVED DYNAMIC RANGE AC coupling the photodiode current input to the AD8015 (Fig- ure 17) extends fiber optic receiver overload while sacri- ficing only sensitivity (increasing receiver dynamic range by 2 dB). This application results in typical overload of –4 dBm, ...

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