Wideband/Differential Output a Transimpedance Amplifier AD8015 FUNCTIONAL BLOCK DIAGRAM FEATURES Low Cost, Wide Bandwidth, Low Noise Bandwidth: 240 MHz AD8015 Pulse Width Modulation: 500 ps 8 +V NC 1 S 10k Rise Time/Fall Time: 1.5 ns 50 Input Current Noise: 3.0 pA/Hz 100 MHz I 2 +1 7 +OUTPUT IN G = 30 Total Input RMS Noise: 26.5 nA to 100 MHz G = 3 3 6 OUTPUT Wide Dynamic Range NC 50 +1 Optical Sensitivity: 36 dBm 155.52 Mbps V + +V 5 V Peak Input Current: 6350 mA BYP 4 S S Differential Outputs 1.7V Low Power: 5 V 25 mA NC = NO CONNECT Wide Operating Temperature Range: 408C to +858C APPLICATIONS 25.0E+3 Fiber Optic Receivers: SONET/SDH, FDDI, Fibre Channel Stable Operation with High Capacitance Detectors DIFFERENTIAL Low Noise Preamplifiers 20.0E+3 Single-Ended to Differential Conversion I-to-V Converters 15.0E+3 SINGLE-ENDED 10.0E+3 PRODUCT DESCRIPTION 5.0E+3 The AD8015 is a wide bandwidth, single supply transimpedance amplifier optimized for use in a fiber optic receiver circuit. It is a 000.E+0 complete, single chip solution for converting photodiode current 10.0E+6 100.0E+6 1.0E+9 into a differential voltage output. The 240 MHz bandwidth enables FREQUENCY Hz AD8015 application in FDDI receivers and SONET/SDH receivers with data rates up to 155 Mbps. This high bandwidth Figure 1. Differential/Single-Ended Transimpedance vs. supports data rates beyond 300 Mbps. The differential outputs Frequency drive ECL directly, or can drive a comparator/ fiber optic post amplifier. 5.0 In addition to fiber optic applications, this low cost, silicon al- ternative to GaAs-based transimpedance amplifiers is ideal for 3.0pF 4.5 systems requiring a wide dynamic range preamplifier or single- 2.0pF ended to differential conversion. The IC can be used with a 4.0 standard ECL power supply (5.2 V) or a PECL (+5 V) power 1.5pF supply the common mode at the output is ECL compatible. 3.5 The AD8015 is available in die form, or in an 8-pin SOIC package. 3.0 2.5 1.0pF 0.5pF 2.0 000.0E+0 20.0E+6 40.0E+6 60.0E+6 80.0E+6 100.0E+6 FREQUENCY Hz Figure 2. Noise vs. Frequency (SO-8 Package with REV. A Added Capacitance) Information furnished by Analog Devices is believed to be accurate and Analog Devices, Inc., 1996 reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties One Technology Way, P.O. Box 9106, Norwood, 02062-9106, U.S.A. which may result from its use. No license is granted by implication or Tel: 617/329-4700 Fax: 617/326-8703 otherwise under any patent or patent rights of Analog Devices. X-RESISTANCE EQUIVALENT INPUT CURRENT NOISE pAHz(SO Package T = +258C and V = +5 V, unless otherwise noted) AD8015SPECIFICATIONS A S AD8015AR Parameter Conditions Min Typ Max Units DYNAMIC PERFORMANCE Bandwidth 3 dB 180 240 MHz Pulse Width Modulation 10 A to 200 A Peak 500 ps Rise and Fall Time 10% to 90% 1.5 ns 1 Settling Time to 3%, 0.5 V Diff Output Step 3 ns INPUT Linear Input Current Range 2.5%, Nonlinearity 25 30 A Max Input Current Range Saturation 200 350 A Optical Sensitivity 155 Mbps, Avg Power 36 dBm Input Stray Capacitance Die, by Design 0.2 pF SOIC, by Design 0.4 pF Input Bias Voltage +V to I and V 1.6 1.8 2.0 V S IN BYP NOISE Die, Single Ended at P , OUT or Differential (P N ), OUT OUT C = 0.3 pF STRAY Input Current Noise f = 100 MHz 3.0 pA/Hz Total Input RMS Noise DC to 100 MHz 26.5 nA TRANSFER CHARACTERISTICS Transresistance Single Ended 8 10 12 k Differential 16 20 24 k Power Supply Single Ended 37.0 dB Rejection Ratio Differential 40 dB OUTPUT Differential Offset 620 mV Output Common-Mode Voltage From Positive Supply 1.5 1.3 1.1 V Voltage Swing (Differential) Positive Input Current, R = 1.0 V p-p L Positive Input Current, R = 50 600 mV p-p L Output Impedance 40 50 60 POWER SUPPLY T to T MIN MAX Operating Range Single Supply +4.5 +5 +11 V Dual Supply 2.25 5.5 V Current 25 26 mA NOTES 1 Settling Time is defined as the time elapsed from the application of a perfect step input to the time when the output has entered and remained within a specified error band symmetrical about the final value. This parameter includes propagation delay, slew time, overload recovery, and linear settling times. Specifications subject to change without notice. 1 NOTES ABSOLUTE MAXIMUM RATINGS 1 Stresses above those listed under Absolute Maximum Ratings may cause Supply Voltage (+V to V ) . 12 V S S permanent damage to the device. This is a stress rating only and functional 2 Internal Power Dissipation operation of the device at these or any other conditions above those indicated in the Small Outline 0.9 Watts operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Output Short Circuit Duration . Indefinite 2 Specification is for device in free air: 8-pin SOIC package: = 155C/W. JA Maximum Input Current 10 mA Storage Temperature Range 65C to +125C ORDERING GUIDE Operating Temperature Range (T to T ) MIN MAX Temperature Package Package AD8015ACHIP/AR 40C to +85C Model Range Description Option Maximum Junction Temperature . +165C Lead Temperature Range (Soldering 10 sec) +300C AD8015AR 40C to +85C 8-Pin Plastic SOIC SO-8 AD8015ACHIPS 40C to +85C Die Form CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily WARNING accumulate on the human body and test equipment and can discharge without detection. Although the AD8015 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD ESD SENSITIVE DEVICE precautions are recommended to avoid performance degradation or loss of functionality. 2 REV. A