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19-2348; Rev 0; 2/02
MAX3865 Evaluation Kit
General Description
The MAX3865 evaluation kit (EV kit) has one circuit for electrical evaluation and a second circuit for optical evaluation. The electrical EV board is designed to familiarize the user with the behavior of the automatic power control (APC) and automatic modulation control (AMC) features of the MAX3865 in an environment that is easy to instrument using the many test points provided. The optical EV board closely resembles what might be found in an actual communications environment. The electrical part of the EV kit is designed to familiarize the user with the controlling action of the MAX3865. The kit contains a synthetic laser plus monitor diode, for which threshold current and gain can be varied through jumper connections. The user can program values for the bias (average) and modulation (peak-to-peak) currents in the monitor diode for a desired extinction ratio. The synthetic laser can be changed to simulate variation of temperature or approaching end of life, and the extinction ratio is held constant. Parameters such as loop settling time or the restrictions imposed on the maximum currents in the laser can also be observed. o Fully Assembled and Tested o Fully Matched for Best Return Loss
Features
Evaluates: MAX3865
Ordering Information
PART MAX3865EVKIT TEMP RANGE -40C to +85C IC PACKAGE 32 QFN
Electrical Component List
DESIGNATION C11-C14, C20 C15-C18, C22, C26 C19 C21 C23, C24 C25 C36-C39 D11, D13 D12 J3, J4, J5 QTY 5 6 1 1 2 1 0 2 1 3 DESCRIPTION 0.1F 10%, 10V ceramic capacitors (0402) 0.01F 10%, 10V ceramic capacitors (0402) 47pF 5%, 10V ceramic capacitor (0402) 22pF 5%, 10V ceramic capacitor (0402) 10F 10%, 10V tantalum capacitors 0.01F 10%, 10V ceramic capacitor (0603) Do not install (0402) Rectifier diodes, 1A Digi-Key S1ADICT-ND Red LED, T1 pkg Digi-Key 363-ND Test points JU11-JU18 JU11-JU18 L12, L13 Q11 R9 R11, R12, R13 R14-R17 R18, R19 R20 R21 R22 R23 R24 8 8 2 1 1 3 4 2 1 1 1 1 1 J11-J15 5 DESIGNATION QTY DESCRIPTION SMA connectors (edge mount, round contact) EFJohnson 142-0701-801 or Digi-Key J502-ND Note: Cut center pin to approximately 1/16in length. 1-pin 2-pin headers (0.1in centers) Shunts 1.2H inductors Coilcraft 1008 LS-122XKBC PNP transistor Central Semiconductor CMPT3906 100 1% resistor (0402) 33k 5% resistors (0603) 3.3k 5% resistors (0603) 200 1% resistors (0402) 20 5% resistor (2010) 10 1% resistor (1210) 33 1% resistor (0603) 2k 1% resistor (0603) 1.0k 1% resistor (0603)
________________________________________________________________ Maxim Integrated Products
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MAX3865 Evaluation Kit Evaluates: MAX3865
Electrical Component List (continued)
DESIGNATION R25-R28 R29, R30 TP1, TP4, TP12, TP13, TP14, TP16, TP17 QTY 4 2 DESCRIPTION 100k variable resistors Bourns 3296W or Digi-Key 3296W-104-ND 10k 1% resistors (0402) DESIGNATION JU51, JU52, JU53, JU56 JU51, JU52, JU53, JU56 L52 7 Test points L53, L54 MAX3865 EGJ 32-pin QFN Note: U11 has an exposed paddle that requires that it be solder attached to the circuit board to ensure proper functionality of the part. L55, L56, L57 L58 R2 R3, R4, R6, R7 R8, R62 R51, R52, R53 R54-R57 R58, R59 R60 R61 R65-R68 2 3 1 1 0 2 3 4 2 1 1 4
Optical Component List (continued)
QTY 4 4 1 DESCRIPTION 1 x 2 pin headers, 0.1in centers Shunts 1.2H inductor Coilcraft 1008CS-122XKBC 4H inductors BLM11A102S (0805) 2H inductors BLM11HA471SG (0603) 10H inductor Coilcraft DO1608C-103 10k 1% resistor (0402) Do not install (0402) 100 1% resistors (0402) 33k 5% resistors (0603) 3.3k 5% resistors (0603) 200 1% resistors (0402) 20 resistor (0402) 24.9 resistor (0402) 100k variable resistors Bourns 3296W or Digi-Key 3296W-253-ND MAX3865EGJ 32-pin QFN Note: U1 has an exposed paddle that requires that it be solder attached to the circuit board to ensure proper functionality of the part. Test points
U11
1
Optical Component List
DESIGNATION C3 C4 C40-C43 C51-C54 C55-C58, C63 C59, C60 C61 D2 D51 D52 QTY 1 1 0 4 5 2 1 1 1 1 DESCRIPTION 10F 10%, 10V tantalum capacitor 0.01F 10%, 10V ceramic capacitor (0603) Do not install (0402) 0.1F 10%, 10V ceramic capacitors (0402) 0.01F 10%, 10V ceramic capacitors (0402) 0.1F 10%, 10V ceramic capacitors (0603) 1pF 0.1pF, 10V ceramic capacitor (0402) User-supplied diode Rectifier diode, 1A Digi-Key S1ADICT-ND Red LED, T1 pkg Digi-Key P363-ND SMA connectors, edge mount (round contact) EFJohnson 142-0701-801 or Digi-Key J502-ND Note: Cut center pin to approximately 1/16in length.
U51
1
VCC2, GND, TP2, TP3, TP52, TP53, TP54 None None None
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1 1 1
MAX3865 EV kit circuit board, rev C MAX3865 EV kit data sheet MAX3865 data sheet
J51-J54
4
2
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MAX3865 Evaluation Kit
Component Suppliers
SUPPLIER AVX EFJohnson Murata PHONE 843-444-2863 402-474-4800 415-964-6321 FAX 843-626-3123 402-474-4858 415-964-8165
load when an actual laser is used. 3) Program the gain of the synthetic laser using the jumper settings shown in Table 1. Remember that the synthetic laser is not a real laser. It mimics only some characteristics of a real laser. In particular, its input behaves like a linear resistor and not like a diode. As input current is increased, synthetic laser voltage continues to increase rather than saturating (at something in excess of 1V) like a real laser (Figure 1). 4) AMC is the preferred operating mode for the MAX3865. Average optical power output and extinction ratio are automatically held constant. Program the bias and modulation currents using the AMC and APC set points. Set the laser parameters from Table 1: ITHRESHOLD = 20mA LASER Gain = 0.01 Program the AMC and APC set points: * Program the AMC and APC.2V points: 1 set IAPC = 5 x R27 + 2k + 3.3k IAMC = 5 x 1.2V R28 + 2k + 3.3k
Evaluates: MAX3865
Note: Please indicate that you are using the MAX3865 when contacting these component suppliers.
Quick Start
Electrical Evaluation
1) Data and clock Input levels--set the data rate at 20Mbps (10MHz) to allow measurement of the AC current from the synthetic monitor diode with an oscilloscope. If you are using relatively low-speed data (up to about 100Mbps), it is acceptable to use a single-ended input rather than fully differential. Amplitude can be in the range: a) Peak-to-peak differential voltage: 200mV to 1600mV b) Instantaneous voltage at any input pin: 1.3V to (VCC + 0.4V) A convenient choice is 250mV peak-to-peak to DATA+ with VDR connected to VCC at JU18. Unless you are concerned about at-speed testing of rise time or jitter, do not use the retiming feature of the MAX3865 in the electrical EV kit. 2) Connector J15 must be connected to ground via 50 at all times. This can be a 50 resistor at the connector, or a properly terminated 50 line to an oscilloscope. Including the back-terminating resistor R22, the peak-to-peak data voltage at J15 is: VP-P (J15) = IMOD 20 Note that this voltage is AC-coupled, with a time constant of 8s. The output from the MODN pin is inverted because the MODQ pin is required for the synthetic laser; MODN is terminated in a dummy
IAPC = 250A for R27 = 18.7k IAMC = 250A for R28 = 18.7k
Table 1. Synthetic Laser Gain Settings
GAIN SLOPE (IMD/IMODQ) Threshold Current JU14 JU15 JU16 (MDX )
1 33
20mA Open Short Short
1 100
20mA Open Open Open or short
1 100
60mA Short Short Open or short
1 300
60mA Short Open Open
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MAX3865 Evaluation Kit Evaluates: MAX3865
The resulting bias and modulation currents as seen in Figure 1: I 1 I IBIAS = ITHRESHOLD + APC - x AMC GAIN 2 GAIN or IBIAS = 32.5mA I IMOD = AMC or IMOD = 25mA Gain The bias and modulation currents can be verified by using a voltmeter to measure V BIASMON from TP14 to TP12 and VMODMON from TP14 to TP13: IBIAS = 48 x VBIASMON 200 5) Set VCC = 3.3V. Remember that the operating voltages at the MAX3865 output pins must at all times satisfy the minimum voltages for compliance: VBIAS or VBIASX 1.0V VMODQ or VMODN 1.8V VBIAS = VCC_LASER - (IBIAS + IMOD) 10, if JU14 is short VBIAS = VCC_LASER - (IBIAS + IMOD) 30, if JU14 is open Min VMODN = VCC_LASER - IMOD 30 The operating voltages must also satisfy the maximum voltages for compliance: VBIAS or VBIAS_X (chip VCC + 0.4V) VMODQ or VMODN (chip VCC + 1.2V) To satisfy these constraints, the VCC_LASER for the synthetic laser must be disconnected from the main supply to the chip (at JU17), and connected to some higher voltage. For the currents programmed in step 4, set VCC_LASER = 4.5V. 6) The synthetic laser current can be observed by the voltage difference between JU14 and TP17. The total current flows in 10 resistor R21, but note that its bandwidth is restricted to about 100MHz by the combination of C19 and the input capacitance of the test oscilloscope. Similarly, the current in the
32 x VMODMON IMOD = 200 The corresponding monitor currents: IBIASMON 677A and IMODMON 781A. See Figure 1 to see how the set-point currents and actual bias and modulation currents are related.
Table 2. Test Setup Summary for the AMC Mode with the Electrical EV Kit
COMPONENT J11 (DATA-) J12 (DATA+) J13 (CLK+) J14 (CLK-) JU11 JU12 JU13 JU14 JU15 JU16 JU17 JU18 R25 R26 R27 R28 STATE Unconnected Data in Unconnected Unconnected Short circuit Open circuit Open circuit Open circuit Open circuit Open circuit Open circuit Short circuit Fully clockwise Fully clockwise Approximately 20k Approximately 20k -- 250mVP-P at 20Mbps (10MHz) -- -- Disable data latch Enable AMC mode Enable AMC mode Set laser gain and threshold Set laser gain and threshold Disconnect monitor-diode shunt Use VCC_LASER (VCC + 1) Set data reference VDR = VCC Set laser iBIASMAX = 100mA Set laser iMODMAX = 60mA Set monitor-diode iAPC 250A Set monitor-diode iAMC 250A COMMENT
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MAX3865 Evaluation Kit Evaluates: MAX3865
(a) DC-COUPLED ELECTRICAL EV KIT PEAK-TO-PEAK CALLED IAMC MD CURRENT GAIN
AVERAGE CALLED IAPC
LASER CURRENT IMOD THRESHOLD (b) AC-COUPLED OPTICAL EV KIT PEAK-TO-PEAK CALLED IAMC MD CURRENT IBIAS
AVERAGE CALLED IAPC
IBIAS IMOD
LASER CURRENT
Figure 1. Relation Between Chip-Output Currents and Monitor-Diode Currents
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MAX3865 Evaluation Kit Evaluates: MAX3865
monitor diode can be observed by the voltage difference between TP16 and TP17; this current flows in 1k resistor R24. The synthetic laser is sensitive to stray capacitance at JU14 and TP16. When measuring DC voltages, connect a 100k resistor in series with the meter, and physically locate this resistor close to the test point. When observing waveforms, use a highimpedance probe with <15pF input capacitance. It is helpful to use a differential oscilloscope, with its +input at JU14/TP16 and its -input at TP17. 7) Now change the laser threshold to approximately 60mA: JU14 short-circuit JU15 short-circuit * Average and peak-to-peak currents I APC and IAMC in the monitor diode do not change from the values programmed by R27 and R28. Optical power output is held constant by MAX3865, despite changes in the laser characteristics. * Bias current in the laser changes as required to compensate for the change in threshold: IBIAS 72.5mA and IBIASMON 1510A. * Peak-to-peak current in the laser should remain constant, but may in fact change slightly because the gain of the laser does not remain precisely constant when JU14 and JU15 are changed: IMOD 25mA and IMODMON 781A. 8) Change the laser again to 20mA threshold and 0.03 gain: JU14 open circuit JU15 short circuit * Average and peak-peak currents in the monitor diode should not change. * Laser currents change as required to compensate for the changed characteristic: IBIAS 27.5mA for which IBIASMON 573A IMOD 8.3mA for which IMODMON 259A 9) Restore the original settings of Table 2. Vary R27 and/or R28, and observe that the monitor-diode currents satisfy the equations in step 4--always provided that the laser currents I BIAS and I MOD remain within their programmed upper bounds, and also that the chip output voltages remain within compliance range. Try reducing the upper bounds (set by R25 and R26) on I BIAS and I MOD , and observe that the warning flag sets when the bounds fall below the required values. Try different laser characteristics and different VCC supply voltages. 10) Observe that mark-density compensation is automatic. There is no sag in the monitor-diode current, even for data that consists of a 2MHz (4Mbps) square wave that corresponds to groups of 600 consecutive identical digits at 2.5Gbps, alternately zero and 1.
Optical Evaluation
The optical part of the EV kit mimics what might be found in a typical optical-communications environment. The laser is AC-coupled to the MAX3865, with series capacitors C59 and C60 and inductive pullups L53-L56. In this way, the voltage at the active and dummy modulation output pins can swing symmetrically above and below the VCC supply. Outputs in excess of 2VP-P are available before the instantaneous voltage at either output pin falls below the specified 1.8V minimum, even when VCC is as small as 3.3V nominal and the laser drop is as large as 2.0V. However, this arrangement must not be used with VCC = 5V nominal, or the absolute maximum voltage ratings of MAX3865 are exceeded. The MAX3865 EV kit does not include a laser-plus-monitor-diode combination; this must be provided by the user. Available laser/monitor combinations have a variety of pinouts; the kit makes provision for mounting almost all of these (Figure 2). VCC should be 3.3V nominal. As supplied, the EV kit has L58 short circuit, R62 open circuit, and C61 open circuit. If L58 is to be included, a VCC connection to L53 must be cut, either by cutting a PC board trace or drilling out a via: 1) If the data is to be latched, open circuit JU51 to enable clock input; otherwise, leave JU51 in short circuit. 2) Set the mode of operation to manual by open circuit JU52, and short circuit JU53. 3) Adjust R65, R66, R67, and R68 to the full counterclockwise position. This sets the modulation and bias currents to their minimum value. 4) Apply a differential input signal (250mVP-P per side) to J51 and J52 (DATA+ and DATA-). 5) If the latch is enabled, apply a differential clock signal (250mVP-P per side) to J53 and J54 (CLK+ and CLK-).
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MAX3865 Evaluation Kit
6) The EV kit is designed to allow connection of a variety of laser/monitor diode pin configurations. Connect a TO-header-style laser with monitor diode (Figure 2) as follows: a) Keeping the module leads as short as possible, connect the laser-diode cathode to the center pad on the component side of the circuit board. The anode is then connected to one of the two remaining component-side VCC pads. The monitor diodes leads solder to the bottom of the circuit board. b)The monitor photodiode pads are arranged in a series of five pads on the bottom (solder side) of the PC board. The photodiode anode goes to one of three pads that are separated by two V CC pads. The MD pin may be connected to the anode by a solder bridge. Connect the photodiode cathode to VCC by bridging the cathode pad to the adjacent VCC pad. 7) Power up the board with a VCC of 3.3V. 8) Adjust R65 clockwise until the desired maximum bias current is achieved. The maximum current should be above threshold by an amount greater than any change in current expected with temperature and age. Attach a voltmeter between VCC at TP54 and TP52 to monitor the bias current: IBIAS = 48 xVBIASMON 200 9) Adjust R66 clockwise for the desired maximum modulation current. The maximum modulation current should be large enough to allow for any change in current required to maintain constant power with temperature and age. Attach a voltmeter between VCC at TP54 and TP53 to monitor the modulation current: IMOD = 32 x VMODMON 200
Evaluates: MAX3865
Be careful not to fall below the compliance voltage of the modulation output as given by: I VCC - MOD x 25 1.8V 2 10) Remove JU53 to enable feedback control of the bias and modulation currents. 11) Adjust R67 clockwise to set the bias current to a value less than IBIASMAX, which was set previously in step 8. The bias current can be monitored with a voltmeter as before. 12) Adjust R68 clockwise to set the modulation current to a value less than IMODMAX, which was set previously in step 9. The modulation current can be monitored with a voltmeter as before.
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MAX3865 Evaluation Kit Evaluates: MAX3865
CONFIGURATION 1 CONFIGURATION 2
TOP OF PC BOARD
TOP OF PC BOARD
LD
TO-46 CAN LASER/PHOTODIODE PAIR
LD
TO-46 CAN LASER/PHOTODIODE PAIR
BOTTOM OF PC BOARD PD PD
BOTTOM OF PC BOARD
SOLDER BRIDGES
SOLDER BRIDGES
CONFIGURATION 3
CONFIGURATION 4
TOP OF PC BOARD
TOP OF PC BOARD
TO-46 CAN LASER/PHOTODIODE PAIR
LD
TO-46 CAN LASER/PHOTODIODE PAIR
LD
BOTTOM OF PC BOARD
PD
BOTTOM OF PC BOARD
PD
SOLDER BRIDGES
SOLDER BRIDGES
PAD LAYOUT
GND GND
VCC VCC VCC
VCC
GND
GND
Figure 2. Attachment of a Laser Diode/Monitor Diode to the MAX3865 EV Kit 8 _______________________________________________________________________________________
MAX3865 Evaluation Kit
Adjustment and Control Descriptions*
COMPONENT NAME ELECTRICAL OPTICAL Enables/disables data retiming. Shunt to disable data retiming. Open for direct data transmission. -- Bias and modulation current off MODMAX and BIASMAX control current directly APCSET controls bias current for constant average power AMCSET and APCSET control currents for constant power and extinction ratio Short to simulate laser to monitor diode current gains other than 0.01 Open if laser-to-monitor diode current gain < 0.005 Open to bias the synthetic laser at a voltage other than VCC Adjusts maximum bias current set point Adjusts maximum modulation current set point Adjusts average MD current set point Adjusts peak-to-peak MD current set point Supply voltage Ground reference Monitor bias current Monitor modulation current Monitor synthetic photo-diode current Attachment for alternate bias to the synthetic laser FUNCTION
Evaluates: MAX3865
JU11 JU12 Short Open Short Open JU13 Short Short Open Open JU52 Short Open Short Open
JU51 JU53 Short Short Open Open NA JU56 NA R65 R66 R67 R68 TP2, TP54 TP3 TP52 TP53 NA NA
RETIMING ENABLE MODE SELECT Shutdown Manual APC AMC MD GAIN SETTING MD SHUNT ALTERNATE VCC BIASMAX MODMAX APC SET POINT AMC SET POINT VCC GND BIAS MONITOR MOD MONITOR MD MONITOR ALTERNATE VCC
JU14, JU15 JU16 JU17 R25 R26 R27 R28 TP1, TP14 TP4 TP12 TP13 TP16 TP17
*See Quick Start first.
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Evaluates: MAX3865
3
JU16 2
1
VCC
MD
GND
MD_X
APCSET
BIASMAX
MODMAX
VCC DATADATA+ GND 23 22 21 20 19 18 17 +VCC1 C17 0.01F
AMCSET
MAX3865 Evaluation Kit
GND
RTEN
EN0
EN1
FAIL
BIASMON
MODMON
C15 0.01F 9 10 11 12 13 14 15 16
GND
Figure 3. MAX3865 EV Kit Electrical Board Schematic
TP16 +VCC1 R28 100k CW +VCC1 C16 0.01F C37 OPEN R15 3.3k JU15 C36 OPEN Q11 R23 2k C21 22pF R24 1k R14 3.3k C39 OPEN 32 28 R9 100 GND 24 +VCC1 C19 47pF C20 0.1F JU15 R22 33 L12 1.2H C23 10F D13 VCC_LASER J5 27 26 25 +VCC1 1 2 J12 3 C12 0.1F J11 C11 0.1F 31 30 29 TP16 TP17 +VCC1 C38 OPEN R16 3.3k R17 3.3k C24 10F CW R26 100k CW R25 100k CW C25 0.01F R27 100k VCC_LASER JU17 C22 0.01F R29 10k
10
U1 MAX3865
VCR MODN VCC BIAS BIAS_X CLK+ CLKVCC MODQ VCC +VCC1 JU18 5 J13 6 7 +VCC1 8 C14 0.1F C13 0.1F 4 VDR R20 20 R21 10 C18 0.01F JU14 C26 0.01F J14 TP13 TP12 TP14 R18 200 R19 200 +VCC1 JU11 JU12 JU13 R11 33k R13 33k R12 33k LED D12
R30 10k
VCC J4
D11
L13 1.2H
TP4
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GND J3
R2 10k TP2 +VCC5 C56 0.01F R68 100k CW C40 OPEN R56 3.3k +VCC5 +VCC5 +VCC5 +VCC5 C41 OPEN R55 3.3k CW R65 100k R4 OPEN JU56 C43 OPEN 32 28 VCC MD MD_X GND R6 OPEN GND GND 23 22 21 20 19 18 BIAS BIAS_X GND 17 L57 2H C59 0.1F R60 20 R62 100 15 16 TP53 TP52 TP54 LED D52 R53 33k R58 200 R59 200 +VCC5 R8 100 C61 1pF +VCC5 PHOTODIODE D2 LASER +VCC5 C60 0.1F R61 24.9 C57 0.01F 24 +VCC5 +VCC5 +VCC5 L55 2H AMCSET 27 26 25 +VCC5 BIASMAX MODMAX VCC DATADATA+ APCSET 1 2 J52 3 C52 0.1F J51 C51 0.1F 31 30 29 L56 2H L53 4H R3 OPEN L54 4H CW R54 3.3k C42 OPEN L58 10H CW R66 100k R57 3.3k
+VCC5
VCC J2 C3 10F C4 0.01F R67 100k
D51
L52 1.2H
TP3
GND
RTEN
EN0
EN1
FAIL
BIASMON
C55 0.01F 9 10 11 12 13 14
MODMON
Figure 4. MAX3865 EV Kit Optical Board Schematic
R7 OPEN
GND J1
U51 MAX3865
MODQ MODN VCC
VCC
SB1 SB2 SB3
+VCC5 VDR VCR CLK+ CLKVCC 5 J53 6 7 +VCC5 8 C54 0.1F C53 0.1F
4
J54
C58 0.01F
C63 0.01F
Evaluates: MAX3865
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JU51 JU52 JU53 R51 33k R52 33k
MAX3865 Evaluation Kit
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MAX3865 Evaluation Kit Evaluates: MAX3865
Figure 5. MAX3865 EV Kit Component Placement Guide--Component Side
Figure 6. MAX3865 EV Kit PC Board Layout--Component Side
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MAX3865 Evaluation Kit Evaluates: MAX3865
Figure 7. MAX3865 EV Kit PC Board Layout--Ground Plane
Figure 8. MAX3865 EV Kit PC Board Layout--Power Plane
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MAX3865 Evaluation Kit Evaluates: MAX3865
Figure 9. MAX3865 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.
14 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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