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19-1790; Rev 0; 9/00
MAX3864 Evaluation Kit
General Description
The MAX3864 evaluation kit (EV kit) simplifies evaluation of the MAX3864 transimpedance preamplifier. The EV kit includes a circuit that emulates the highspeed, current input signal that would be produced by a photodiode. The MAX3864 EV kit is fully assembled and tested. o Fully Assembled and Tested o Includes Photodiode Emulation Circuit
Features
Evaluates: MAX3864
Ordering Information
PART MAX3864EVKIT-SO TEMP. RANGE -40C to +85C IC PACKAGE 8 SO
Component List
DESIGNATION C1, C2, C4, C7 QTY 4 DESCRIPTION 1000pF 10%, 25V (min) ceramic capacitors (0603) Murata GRM39X7R102K050A 1000pF 10%, 25V (min) ceramic capacitors (0805) Murata GRM40X7R102K050A 0.1F 10%, 25V (min) ceramic capacitors (0603) Murata GRM39X7R104K016A 33F 10%, 25V (min) tantalum capacitors AVX TAJE336K025 200 5% resistors (0603) 510 5% resistors (0402) Note: R2 and R10 = two 510 resistors in series 51 5% resistors (0603) 1k 5% resistors (0603) 1k variable resistor Bourns or Digi-Key 3296W-102-ND 5k 5% resistor (0805) 10k variable resistor Bourns or Digi-Key 3296W-103-ND 10k 5% resistor (0805) Ferrite beads Murata BLM11A601S MAX3864ESA 8-pin SOIC CMPT3906 PNP Transistor Central Semiconductor MAX400CSA 8-pin SOIC DESIGNATION U4, U5 J1-J5 VCC, +15V, GND JU1 JU2 C8, C9 R1, R9 R2, R10 R3, R11 R4, R12 R5 R6 R7 R8 L1, L2 U1 U2 U3 2 2 4 2 2 1 1 1 1 2 1 1 1 None None None None QTY 2 5
Component List
DESCRIPTION User-supplied optical modules SMA connectors (edge mount) E.F. Johnson 142-0701-801 or Digi-key J502-ND Test points Digi-key 5000-ND 2-pin header (0.1in centers) Digi-Key S1012-36-ND 470pF capacitor (0805) Murata GRM40COG471J050A Shunt for JU1 Digi-Key S9000-ND MAX3864 EV kit (Rev. A) circuit board MAX3864 data sheet MAX3864 EV kit data sheet
C10, C11
2
3 1 1 1 1 1 1
C3, C5, C6, C12-C17
9
Component Suppliers
SUPPLIER AVX Central Semiconductor Murata PHONE 843-444-2863 516-435-1110 415-964-6321 FAX 843-626-3123 516-435-1824 415-964-8165
Note: Please indicate that you are using the MAX3864 when contacting these component suppliers.
________________________________________________________________ Maxim Integrated Products
1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800. For small orders, phone 1-800-835-8769.
MAX3864 Evaluation Kit Evaluates: MAX3864
Quick Start
1) Remove shunt from jumper JU1. 2) Connect a +3.3V supply to the VCC terminal and ground to the GND terminal. 3) Connect OUT+ and OUT- to the 50 inputs of a high-speed oscilloscope. 4) Connect a signal source to INPUT. Set the signal amplitude to 50mVp-p (this may require some attenuation between the source and the MAX3864 EV kit.) The signal should have a data rate between 1000Mbps and 2500Mbps. 5) The differential signal at the oscilloscope should be between 75mVp-p and 150mVp-p.
Table 1. Recommended Resistor Values
EVALUATION KIT MAX3864EVKIT-SO R1, R9 200 (0402) R2, R10 1020 (composed of two 510 (0402) resistors)
resistors have parasitic capacitance that reduces their impedance at frequencies above 1GHz. The user should carefully evaluate any changes to R1 and R2. Table 1 shows the recommended resistor values.
Photodiode Emulation
The following procedure can be used to emulate the high-speed current signal generated by a photodiode: 1) Select the desired average optical power (P AVE) and extinction ratio (re). 2) Calculate the average current (IAVE), and adjust R7 and R5 to obtain it.
IAVE = 10(PAVE/10) 1000
Detailed Description
The MAX3864 is designed to accept a DC-coupled input from a high-speed photodiode, with a total amplitude of 10A to 2mA. Unfortunately, high-speed current sources are not common laboratory equipment. Also, because the MAX3864 provides a DC bias for the photodiode, it cannot be DC-coupled to signal sources. To allow characterization without a photodiode, the MAX3864 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 MAX3864 input, creating an input current. U2 and U3 form a simple DC current source that is used to apply a DC offset 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
= photodiode responsivity in A/W PAVE in dBm IAVE in Amps 3) Calculate the AC signal current, and adjust the signal generator to obtain it. IINPUT = 2 IAVE(re - 1) / (re + 1) IINPUT in Amps
Table 2. Connections, Adjustments, and Control
CONTROL VCC +15V GND JU1 R5 R7 OUT+, OUTINPUT DESCRIPTION Supply Voltage Connection (3.0V 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. Potentiometer. Fine adjustment of the DC current input. Potentiometer. Coarse adjustment of the DC current input. Connections for the MAX3864 Output Signal Input Connection for a Signal Generator
2
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MAX3864 Evaluation Kit Evaluates: MAX3864
C7 1000pF C16 0.1F
R12 1k NO GND PLANE R9 R10 200 R11 51 1020 C17 0.1F J5
+15V R6 5k 1 R5 1k 3 1 R7 10k 3 R8 10k 2 +15V C4 1000pF C1 1000pF C3 0.1F JU1 3 2 2 4 2 U3
MAX400
J4 INPUT
J6 61 3 U2
FERRITE L1 C8 33F 25V C9 33F 25V +15V
J8
7 J7
FERRITE L2
J9 VCC1 J10 VCC2
C2 1000pF R4 1k VCC1 NO GND PLANE R1 200 R3 51 C14 0.1F J12 J11 C15 0.1F VCC2 1 C11 1000pF 2 VCC U4 GND OUTOUT+ 4 3 C13 0.1F J14 R2 1020 JU2 C12 0.1F 1 2 3 4 VCC N.C. IN U1 GND OUT+ 8 7 J3 OUTC6 0.1F C5 0.1F J2 OUT+
J1 INPUT
MAX3864 OUT- 6 GND 5
FILTER
VCC2
1 C10 1000pF 2
VCC U5 GND
OUT+ OUT-
4 3
J13
MAX3864CAN
MAX3864CAN
Figure 1. MAX3864 EV Kit Schematic
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 2IAVE(re - 1) / (re + 1) = 16A. To generate this current through the 2200 input resistors, set the signal source to produce an output level of 16A 1220 = 20mVp-p.
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MAX3864 Evaluation Kit Evaluates: MAX3864
1.0"
Figure 2. MAX3864 EV Kit Component Placement Guide
1.0"
1.0"
Figure 3. MAX3864 EV Kit PC Board Layout--Component Side 4
Figure 4. MAX3864 EV Kit PC Board Layout--Ground Plane
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MAX3864 Evaluation Kit Evaluates: MAX3864
1.0"
1.0"
Figure 5. MAX3864 EV Kit PC Board Layout--Power Plane
Figure 6. MAX3864 EV Kit PC Board Layout--Solder Side
NOTES
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) 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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