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19-1447; Rev 2; 6/01
MAX3266/MAX3267 Evaluation Kits
General Description
The MAX3266 and MAX3267 evaluation kits (EV kits) simplify evaluation of the MAX3266 and MAX3267 transimpedance preamplifiers. The EV kits include a circuit that emulates the highspeed, zero-to-peak current input signal that would be produced by a photodiode. The kit also includes a calibration circuit that allows accurate bandwidth measurements. The MAX3266 and MAX3267 EV kits are fully assembled and tested. o Fully Assembled and Tested o Includes Photodiode Emulation Circuit o Calibration Circuit for Accurate Bandwidth Measurements
Features
Evaluate: MAX3266/MAX3267
Ordering Information
PART MAX3266EVKIT-SO MAX3267EVKIT-SO TEMP. RANGE 0C to +70C 0C to +70C IC PACKAGE 8 SO 8 SO
Component List
DESIGNATION QTY C1, C2, C4, C7, C10, C11 C3, C5, C6, C12-C17 C8, C9 J1-J5 J11-J14 JU1, JU2 None L1, L2 R1, R2, R9, R10 R3, R11 R4, R12 R5 R6, R8 R7 U1 U2 U3 U4 U5 VCC, +15V, GND None None 6 9 2 5 4 2 2 2 4 2 2 1 2 1 1 1 1 0 0 3 1 1 DESCRIPTION 1000pF, 10% ceramic capacitors 0.1F, 25V min, 10% ceramic capacitors 33F 10%, 25V min tantalum capacitors AVX TAJE336K025 SMA connectors (Edge Mount) Open 2-pin headers (0.1" centers) Shunts for JU1, JU2 Ferrite beads Murata BLM11A601S See Table 1 49.9, 1% resistors 1k, 5% resistors 1k potentiometer 10k, 5% resistors 10k potentiometer MAX3266CSA or MAX3267CSA (8-pin SO) CMPT3906 PNP transistor MAX400CSA (8-pin SO) User-supplied optical module User-supplied optical module Test points MAX3266/MAX3267 evaluation kit (rev. b) circuit board MAX3266/MAX3267 data sheet SUPPLIER AVX Central Semiconductor Murata Zetex
Component Suppliers
PHONE 843-444-2863 516-435-1110 415-964-6321 516-543-7100 FAX 843-626-3123 516-435-1824 415-964-8165 516-864-7630
Note: Please indicate that you are using the MAX3266/MAX3267 when contacting these component suppliers.
Quick Start
1) Connect a signal source to INPUT. Set the signal amplitude to 50mVp-p (this may require some attenuation between the source and the MAX3266 EV kit.) The signal should have data rate between 500Mbps and 1250Mbps. 2) Connect OUT+ and OUT- to the 50 inputs of a high-speed oscilloscope. 3) Remove shunts from jumpers JU1 and JU2. 4) Connect a +3.3V supply to the VCC terminal and ground to the GND terminal. 5) The differential signal at the oscilloscope should be between 50mVp-p and 100mVp-p.
Detailed Description
The MAX3266 is designed to accept a DC-coupled input from a high-speed photodiode, with an amplitude of 10A to 1mA zero-to-peak. Unfortunately, high-speed current sources are not common laboratory equipment. Also, because the MAX3266 provides a DC bias for the photodiode, it cannot be DC coupled to signal sources.
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For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
MAX3266/MAX3267 Evaluation Kits Evaluate: MAX3266/MAX3267
To allow characterization without a photodiode, the MAX3266 EV kit provides a simple circuit that emulates a photodiode using common voltage output signal sources. The connector at INPUT is terminated with 50 to ground. This voltage is then AC coupled to a resistance in series with the MAX3266's input, creating an input current. U2 and U3 form a simple DC current source that is used to apply a DC current to the input signal. The values of the series resistive elements, R1 and R2, have been carefully selected not to change the bandwidth of the transimpedance amplifier. Surface-mount resistors have parasitic capacitance that reduces their impedance at frequencies above 1GHz. The user should carefully evaluate any changes to R1 and R2 using the calibration network provided on the EV kit. Table 1 shows the recommended resistor values. 3) Calculate the AC signal current, and adjust the signal generator to obtain it. IINPUT = 2 IAVG(re - 1) / (re + 1) For example: 1) Emulate a signal with an average power of -20dBm and an extinction ratio of 10. 2) -20dBm optical power will produce 10A of average input current (assume photodiode responsivity of 1A/W). Install a current meter at JU1. Adjust R7 and R5 until the current is 10A. 3) The signal amplitude is 2PAVG(re - 1) / (re + 1) = 16A. To generate this current through the 1500 input resistors, set the signal source to produce an output level of 16A 1500 = 24mVp-p.
Noise Measurement
Remove R2 before attempting noise measurements to minimize input capacitance. With R2 removed the total capacitance at the IN pin is approximately 0.5pF. Refer to the Layout Considerations section in the MAX3266/ MAX3267 data sheet for more information.
Photodiode Emulation
The following procedure can be used to emulate the high-speed current signal generated by a photodiode: 1) Select the desired optical power (P AVG in dBm) and extinction ratio (re). 2) Calculate the average current (IAVG), and adjust R7 and R5 to obtain it. 10(PAVG/10 ) 1000
Table 1. Recommended Resistor Values
EVALUATION KIT R1, R9 1000 (0603) R2, R10 510 (0603) 1020 (composed of two 510 (0402) resistors) MAX3266EVKIT-SO
IAVG =
MAX3267EVKIT-SO
200 (0402)
( = photodiode responsivity in A/W)
Table 2. Connections, Adjustments, and Control
CONTROL VCC +15V GND JU1 JU2 R5 R7 DESCRIPTION Supply Voltage Connection (3.0 to 5.5V, 100mA current limit) Supply Voltage Connection for Photodiode Emulator Circuit (+15V, 25mA) Connection for Ground When shunted, the photodiode emulation circuit is active. This is a convenient location to measure the emulated photodiode current. Test Pin. Shunting JU2 disables the MAX3266/MAX3267 DC cancellation amplifier. Potentiometer. Fine adjustment of the DC current input. Potentiometer. Coarse adjustment of the DC current input. Connections for the MAX3266/MAX3267 Output Signal Input Connection for a Signal Generator
OUT+, OUTINPUT
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C7 1000F R12 1k C15 0.1F NO GND PLANE R10 R9 J5
+15V INPUT R6 10k R11 49.9 2 2 2 U3 61 U2 J8 3 7 +15V C4 1000pF JU1 VCC C2 1000pF R4 1k VCC1 VCC N.C. IN U1 NO GND PLANE R1 3 R2 2 1 C3 0.1F GND OUT+ 8 7 J3 OUTC6 0.1F C12 0.1F 1 C11 1000pF 2 VCC VCC2 U4 GND OUTOUT+ 4 3 C13 0.1F J14 C5 0.1F J2 OUT+ C1 1000pF J7 GND FERRITE L2 C9 33F 25V +15V 2 3
MAX400
J4 1k 500 C17 0.1F SEE TABLE 1 FOR MAX3267 RESISTOR VALUES
1 4 J6 FERRITE L1 +15V
Figure 1. MAX3266/MAX3267 EV Kits Schematic
C8 33F 25V J9 VCC1 J10 VCC2 J1 INPUT R3 49.9 C14 0.1F 1 VCC U5 GND C15 0.1F OUT3 J11 OUT+ 4 C10 1000pF 2 J12 500 1k SEE TABLE 1 FOR MAX3267 RESISTOR JU2 VALUES 6 MAX3266 OUTMAX3267 5 4 FILTER GND J13
R5 1k
3
1
R7 10k
3
R8 10k
Evaluate: MAX3266/MAX3267
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VCC2
MAX3266/MAX3267 Evaluation Kits
3
MAX3266/MAX3267 Evaluation Kits Evaluate: MAX3266/MAX3267
1.0"
Figure 2. MAX3266 EV Kit Component Placement Guide
1.0"
1.0"
Figure 3. MAX3266 EV Kit PC Board Layout--Component Side 4
Figure 4. MAX3266 EV Kit PC Board Layout--Ground Plane
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1.0"
1.0"
Figure 5. MAX3266 EV Kit PC Board Layout--Power Plane
Figure 6. MAX3266 EV Kit PC Board Layout--Solder Side
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 5 (c) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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