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19-0126; Rev 0, 01/05
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The MAX3793 evaluation kit is a fully assembled electrical demonstration kit that provides easy evaluation of the MAX3793 4.25Gbps +3.3V trans-impedance amplifier. The evaluation kit also provides mounting for an optical TO header. Note that the MAX3793 evaluation kit provides an electrical interface to the IC that is similar, but not exactly the same as a photodiode.
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Easy +3.3V Electrical Evaluation of the MAX3793 Fully Assembled and Tested EV Kit Designed for 50 Interfaces
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DESIGNATION QTY C1 C12 C13 C16 C2, C6, C11, C14 C3 - C5, C7 - C10 J13, J14, T1 - T8 J1 - J7 JU1, JU2 L1 R11, R12 R1, R2, R4, R8 R13 R3, R6 R5, R7 R9, R10 U1 PD1 1 1 1 1 4 7 10 7 2 1 2 4 1 2 2 2 1 1 DESCRIPTION 470pF 20% Bondable Capacitor (25x25) 33F 10% Tantalum Capacitor (B Case)) 2.2F 10% Ceramic Capacitor (0805) 0.6pF 0.05pF Bondable Capacitor (12x12) 0.1F 10% Ceramic Capacitor (0402) 1F 10% Ceramic Capacitor (0402) TESTPOINT DIGI-KEY 5000K-ND SMA connectors (edge-mount, tab contact) 2-pin headers (0.1in centers) 4.7F 5% Inductor (0603) 10k 1% resistor (0402) 324 1% resistor (0402) 49.9 1% resistor (0402) 4.99k 1% resistor (0402) 53.6 1% resistor (0402) 0 5% resistor (0603) MAX3793E/D DIE User Supplied 4 or 5 PIN TO CAN
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PART MAX3793EVKIT TEMP. RANGE -40C to +85C IC PACKAGE DIE
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SUPPLIER AVX Coilcraft Digi-Key EF Johnson Murata PHONE 843-444-2863 847-639-6400 218-681-6674 402-474-4800 415-964-6321 FAX 843-626-3123 847-639-1469 218-681-3380 402-474-4858 415-964-8165
Note: Please indicate that you are using the MAX3793 when ordering from these suppliers.
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Connect a signal source to J1 (IN). Set the signal amplitude to 350mVP-P (Corresponding to 500AP-P current into the TIA). Set the data rate to 4.25Gbps. Apply 250A to the DC_IN input (TP1) using a DC current source to emulate the DC component of the input signal. A voltage source connected from TP1 to GND may be used if a DC current source is not available. Connect OUT1+ (J3) and OUT1- (J2) to the 50 inputs of a high-speed oscilloscope. Install the shunt on JU1 to enable the average current monitor. Connect a +3.3V supply to VCC (J13) and ground to GND (J14). The differential signal at the oscilloscope should be approximately 240mVP-P.
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_________________________________________________________________Maxim Integrated Products
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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.
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The MAX3793 accepts a DC-coupled input from a highspeed photodiode, for optical modulation amplitudes ranging from -20dBm to 0dBm. The MAX3793 evaluation board facilitates characterization of the MAX3793 TIA with or without a photodiode. The user must assemble the TO header sections, if used. The DIE mount section provides photodiode emulation using a simplified electrical photodiode model. The model provides a 50 electrical input termination, resistors that convert the high speed input voltage to high speed current. A DC path is provided to model the average photodiode current.
10 ( PAVE / 10) IAVG = 1000
where is photodiode responsivity in A/W Calculate the AC signal current (IINPUT in AP-P) as follows, and adjust the signal generator to obtain it:
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IINPUT = 2IAVE
(re - 1) (re + 1)
For example, to emulate a signal with an average power of -18dBm and an extinction ratio of 8 on the electrical circuit. -18dBm optical power will produce 8.7A of average input current (assume a photodiode responsivity of 0.55A/W). Install a current meter between an external DC source and the DC_IN (TP1) test point. Adjust the source to provide 8.7A. The signal amplitude is 2IAVE(re-1)/(re+1) = 13.5A. To generate this current through the 648 series input resistors and the 50 internal resistance, set the signal source to produce an input of 10mVP-P on the IN (J1) input.
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The TO header assembly layout provides a userassembled interface for evaluation of 4 and 5 pin TO headers. (See the MAX3793 datasheet for a suggested TO header layout.)
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Use the following procedure to emulate the high-speed current signal generated by a photodiode: Select the desired optical power (PAVE in dBm) and extinction ratio (re). Calculate the average current (IAVE in Amps) as follows:
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J13 VCC J14 GND
L1 4.7H C12 33F C13 2.2F
VCC TP6 C11 0.1F TP4
VCC C1 470pF C4 1F TP3 MON1 J3 OUT+
BP10 BP1 VCC FILT IN MON GND BP6 VCC
BP9 OUT+
C3 1F J1 IN R5 53.6
R2 324
R1 324 TP5 MON JU1 R11 10k
BP2 BP3 BP4 BP5
MAX3793E/D
U1
GND OUT-
BP8
C2 0.1F
TP1 DC_IN
TEST
R3 4.99k
C16 0.6pF
BP7
C5 1F J2 OUT-
TP7 MON JU2 R12 10k VCC VCC C14 0.1F
4
MON OUT-
1
C8 1F
J6 OUT-
PD1
OUT+
3
GND Alternate Ground Point
2
C9 1F
J7 OUT+
C7 1F J4 R7 53.6
R8 324
R4 324
BP11 BP12
R13 Open
C10 1F J5
R6 4.99k TP2
C6 0.1F
Figure 1. MAX3793 EV Kit Schematic Diagram
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Figure 2. MAX3793 EV Kit Component Placement Guide - Component Side
Figure 3. MAX3793 EV Kit PC Board Layout Solder Side
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Figure 5. MAX3793 EV Kit PC Board Layout Power Plane
Figure 4. MAX3793 EV Kit PC Board Layout Ground Plane
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_____________________
(c) 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
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