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19-2154; Rev 0; 8/01
MAX3825 Evaluation Kit
General Description
The MAX3825 evaluation kit (EV kit) simplifies the evaluation of the MAX3825 quad transimpedance amplifier. The EV kit includes a circuit that emulates the high-speed current input signal produced by a photodiode array. The MAX3825 EV kit is fully assembled and tested. o Fully Assembled and Tested o Includes Photodiode Emulation Circuit
Features
Evaluates: MAX3825
Component List
DESIGNATION C2, C5, C8, C11, C17-C24, C26, C27 C3, C6, C9, C12-C16, C28 C25 R1, R5, R9, R13, R18 R2, R6, R10, R14, R19 R3, R7, R11, R15, R20 R4, R8, R12, R16, R21 R17 L1 J1-J4, J15 J5-J12, J16 TP1-TP4, J13, J14 U1 None None None None None QTY DESCRIPTION 0.1F 10% ceramic capacitors (0402) Murata GRM36X7R104K010A 0.01F 10% ceramic capacitors (0402) Murata GRM36X7R103K016A 10F 10% tantalum capacitor AVX TAJC106K016 681 1% resistors (0402) SUPPLIER 5 5 5 0 1 5 9 6 1 1 1 1 -- -- 221 1% resistors (0402) 4.99k 1% resistors (0402) 53.6 1% resistors (0402) Not installed 56nH inductor Coilcraft 0805HT-56NTKBC SMA connectors (PC-mount) SMA connectors (edge-mount) Test points MAX3825U/D die MAX3825 Rev C EV kit circuit MAX3825 EV kit data sheet MAX3825 data sheet 1mil Au wire for bond pad wiring Conductive epoxy AVX Coilcraft Murata PART MAX3825EVKIT
Ordering Information
TEMP. RANGE 0C to +85C IC PACKAGE Dice
14
9
1 5
Component Suppliers
PHONE 843-946-0238 847-639-6400 770-436-1300 FAX 843-626-3123 847-639-1469 770-436-3020
Note: Please indicate that you are using the MAX3825 when contacting these component suppliers.
________________________________________________________________ Maxim Integrated Products
1
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.
MAX3825 Evaluation Kit Evaluates: MAX3825
Quick Start
1) Connect a signal source to the input of channel 1, J1. Set the signal amplitude to 50mVp-p (this may require some attenuation between the source and the MAX3825 EV kit). The signal should have a data rate of 2.488Gbps. 2) Connect the differential CML outputs of channel 1, J11 and J12, to the 50 inputs of a high-speed oscilloscope. 3) Connect a +3.3V supply to the VCC terminal and ground to the GND terminal. 4) The differential signal at the oscilloscope should be between 150mVp-p and 250mVp-p.
Photodiode Emulation
The following procedure can be used to estimate the high-speed current signal generated by a photodiode: 1) Select the desired optical power (PAVE in dBm) and extinction ratio (re). 2) Calculate the average current (I AVE in A), and adjust a DC reference in series with an ammeter connected to TPn (n = 1, 2, 3, 4) until the proper bias current is obtained: IAVE = 10(PAVE / 10) 1000
( = photodiode responsivity in A/W) Calculate the AC signal current amplitude, and adjust the signal generator to obtain it. IINPUT = 2 For example: 1) Emulate a signal with an average power of -13dBm and an extinction ratio of 10 on channel 1. 2) -13dBm optical power will produce 50A of average input current (assume photodiode responsivity = 1A/W). Connect a power supply in series with an ammeter to TP1. Adjust the power supply until the ammeter reads 50A. 3) The signal amplitude is 2 IAVE(re - 1)/(re + 1) = 82Ap-p. To generate this current through the 902 input resistors, set the signal source to produce an output level of 82A 902 = 74mVp-p.
IAVE
Detailed Description
The MAX3825 EV kit evaluates a MAX3825 quad transimpedance amplifier (TIA) DC-coupled to a high-speed photodiode array with an input current of 10Ap-p to 2mAp-p. This EV kit allows characterization without using a photodiode array by providing a simple circuit that emulates the array's photocurrent using standard 50 test equipment. Each channel's input transmission line is terminated with 50 to ground and AC-coupled into a resistive network. The TIA's AC input current component is found by dividing the input signal by a voltage-to-current converting 902 series resistance. The DC bias current component is adjusted by a separate DC reference (applied to TPn (n = 1, 2, 3, 4) used to set the extinction ratio of a channel's input signal. The values of the series resistive elements R1, R2, R5, R6, R9, R10, R13, and R14 have been carefully selected not to change the bandwidth of the transimpedance amplifier. Surface-mount resistors may have parasitic capacitance that reduces their impedance at frequencies above 1GHz. The user should carefully evaluate any changes to input series resistors using the calibration network provided on the EV kit.
(re - 1) (re + 1)
Table 1. Connections and Adjustments
CONNECTION J1-J4 J5-J12 VCC (J13) GND (J14) J15 J16 TP1-TP4 Inputs (IN1, IN2, IN3, IN4) 50 CML outputs from the MAX3825 (OUT4+, OUT4-, OUT3+, OUT3-, OUT2+, OUT2-, OUT1+, OUT1-) Power-supply connection pin. Connect a +3.3V power supply. Ground Calibration strip input Calibration strip output Input bias current voltage supply (IN1, IN2, IN3, IN4) DESCRIPTION
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VCC1 C16 0.01F
44 39 VCC1 36 C15 0.01F GNDO1 VCCO1 35 C24 0.1F J12 GNDO2 1 N.C. N.C. OUT1+ FILTER IN1 VCCO1 5 FILT1 VCCO2 32 31 C22 0.1F J10 J14 33 VCC1 J13 OUT134 L1 56nH IND0805 C23 J11 0.1F 2 3 4 R1 681 VCCFILT GNDI1 VCCI1 VCCI2 GNDI2 GNDF
43
41
42 40 38
37
J1
C2 0.1F
Figure 1. MAX3825 Evaluation Kit Schematic
VCC1 C25 10F
R4 53.6
R3 4.99k
R2 221
TP1
C3 0.01F
J2 6 IN2
C5 0.1F
U1
OUT2+
MAX3825
OUT2VCCO2 29 VCC1 28 27 C20 0.1F J8 J15 30
R8 53.6 7 FILT2 VCCO3 OUT3+ IN3 OUT39 FILT3 VCCO4 10 IN4 FILT4 N.C. N.C. GNDI4 VCCI4 15 VCC1 16 17 VCCI3 GNDI3 14 R13 681 11 12 13 OUT4+ OUT4VCCO4 24 23 22 21 C14 0.01F ENABLE 18 GNDO3 19 GNDO4 20 C18 0.1F C17 0.1F J6 J5 VCCO3 25 26 C19 J7 0.1F VCC1
R7 4.99k
R6 221
R5 681
C21 J9 0.1F
TP2
C6 0.01F
J3 8 R9 681
C8 0.1F
C27 0.1F R19 221 R21 53.6 R20 4.99k R18 681
C26 0.1F J16
R12 53.6
R11 4.99k
R10 221
R17 OPEN C28 0.01F
TP3
C9 0.01F
J4
C11 0.1F
R16 53.6
R15 4.99k
R14 221
TP4
C12 0.01F
VCC1
Evaluates: MAX3825
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C13 0.01F
MAX3825 Evaluation Kit
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MAX3825 Evaluation Kit Evaluates: MAX3825
1.0"
Figure 2. MAX3825 Evaluation Kit Component Placement Guide--Component Side
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MAX3825 Evaluation Kit Evaluates: MAX3825
1.0"
Figure 3. MAX3825 Evaluation Kit PC Board Layout--Component Side
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MAX3825 Evaluation Kit Evaluates: MAX3825
1.0"
Figure 4. MAX3825 Evaluation Kit PC Board Layout--Ground Plane
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MAX3825 Evaluation Kit Evaluates: MAX3825
1.0"
Figure 5. MAX3825 Evaluation Kit PC Board Layout--Power Plane
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MAX3825 Evaluation Kit Evaluates: MAX3825
1.0"
Figure 6. MAX3825 Evaluation 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.
8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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