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Part: MAX3825EVKIT
Category:
Communication
-> Fiber Optics
Description: MAX3825EVKIT Evaluation Kit For The MAX3825
Company: Maxim Integrated Products
Datasheet: Download MAX3825EVKIT datasheet File size : 711 kB
Request For quote: Find where to buy MAX3825EVKIT
Datasheet text preview:
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, C17C24, C26, C27 C3, C6, C9, C12C16, C28 C25 R1, R5, R9, R13, R18 R2, R6, R10, R14, R19 R3, R7, R11, R15, R20 R4, R8, R12, R16, R21 R17 L1 J1J4, J15 J5J12, J16 TP1TP4, J13, J14 U1 None None None None None QTY DESCRIPTION 0.1µF ±10% ceramic capacitors (0402) Murata GRM36X7R104K010A 0.01µF ±10% ceramic capacitors (0402) Murata GRM36X7R103K016A 10µF ±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 0°C to +85°C 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
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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.
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) C a l c u l a t e the average current (I A V E i n 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 50µA 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 50µA. 3) The signal amplitude is 2 IAVE(re - 1)/(re + 1) = 82µAp-p. To generate this current through the 902 input resistors, set the signal source to produce an output level of 82µA 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 10µAp-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 J1J4 J5J12 VCC (J13) GND (J14) J15 J16 TP1TP4 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 0.01µF
44 39 VCC1 36 C15 0.01µF GNDO1 VCCO1 35 C24 0.1µF J12 GNDO2 1 N.C. N.C. OUT1+ FILTER IN1 VCCO1 5 FILT1 VCCO2 32 31 C22 0.1µF J10 J14 33 VCC1 J13 OUT134 L1 56nH IND0805 C23 J11 0.1µF 2 3 4 R1 681 VCCFILT GNDI1 VCCI1 VCCI2 GNDI2 GNDF
43
41
42 40 38
37
J1
C2 0.1µF
Figure 1. MAX3825 Evaluation Kit Schematic
VCC1 C25 10µF
R4 53.6
R3 4.99k
R2 221
TP1
C3 0.01µF
J2 6 IN2
C5 0.1µF
U1
OUT2+
MAX3825
OUT2VCCO2 29 VCC1 28 27 C20 0.1µF 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 0.01µF ENABLE 18 GNDO3 19 GNDO4 20 C18 0.1µF C17 0.1µF J6 J5 VCCO3 25 26 C19 J7 0.1µF VCC1
R7 4.99k
R6 221
R5 681
C21 J9 0.1µF
TP2
C6 0.01µF
C27 0.1µF R19 221 R21 53.6 R20 4.99k R18 681
C26 0.1µF J16
J3 8 R9 681
C8 0.1µF
R12 53.6
R11 4.99k
R10 221
R17 OPEN C28 0.01µF
TP3
C9 0.01µF
J4
C11 0.1µF
R16 53.6
R15 4.99k
R14 221
TP4
C12 0.01µF
VCC1
Evaluates: MAX3825
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C13 0.01µF
MAX3825 Evaluation Kit
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