MAXIM MAX3658AEVKIT

19-3088; Rev 2, 01/04
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The MAX3658A evaluation kit is a fully assembled
electrical demonstration kit that provides easy evaluation
of the MAX3658A 622Mbps +3.3V trans-impedance
amplifier.
♦
Easy +3.3V Electrical Evaluation of the
MAX3658A
♦
Fully Assembled and Tested
Note that the MAX3658A evaluation kit provides an
electrical interface to the IC that is similar, but not exactly
the same as a photodiode.
♦
EV Kit Designed for 50Ω
Ω Interfaces
DESIGNATION QTY
DESCRIPTION
2.2µF ±10% Ceramic Capacitor
(1206)
DESIGNATION QTY
DESCRIPTION
R24, R25, R30,
4
1.58kΩ ±1% resistor (0402)
R31
T.T.T.T.T.T.T.T.T.T.T.T.T.T.T.T.T.T.T.T UCV3W)XYV3Z4[3Z]\_^9`bac\
d.d.d.d.d.d.d.d.d.d.d.d egf3h)i_f3j4kQj]lnmporq;ltsFu9f3jvlxwAy C0, C20
2
C1, C21
2
0.1µF ±10% Ceramic Capacitor
(0603)
TP0 – TP11
12
TESTPOINT DIGI-KEY 5000KND
C2, C13
2
100pF ±5% Ceramic Capacitor
(0201)
U0
1
User Supplied 5 PIN TO CAN
U1, U2
2
MAX3658AETA 8 TDFN
C3, C12, C15,
C18, C23
5
2200pF ±5% Ceramic Capacitor
(0201)
U3, U4
2
User Supplied 4 PIN TO CAN
C4, C6 – C8,
C14, C17, C19,
C22, C24, C27
10
1µF ±5% Ceramic Capacitor
(0603)
C5, C11
2
0.01µF ±10% Ceramic
Capacitor (0402)
C9, C10, C29
3
0.022µF ±10% Ceramic
Capacitor (0402)
J2, J3, J7, J15
4
SMB connectors (PCB-mount)
J4, J6, J20,
J28, J30, JU1
6
2-pin headers (0.1in centers)
J9 – J11, J13,
J14, J16, J19,
J21 – J27
14
SMA connectors
(edge-mount, tab contact)
L1, L2
2
600Ω ferrite beads (0603)
BLM15BD601SN
R0, R3
2
1.5kΩ ±1% resistor (0402)
R1, R2
2
3kΩ ±1% resistor (0402)
R4, R5
2
374Ω ±1% resistor (0402)
R8 – R11,
R26 – R29,
R33, R34
10
150Ω ±1% resistor (0402)
R12 – R14
3
51.1Ω ±1% resistor (0402)
R16 – R21
6
2.37kΩ ±1% resistor (0402)
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PART
TEMP. RANGE
IC PACKAGE
MAX3658AEVKIT
-40°C to +85°C
8- TDFN
Ž.Ž.Ž.Ž.Ž.Ž.Ž.Ž.Ž.Ž.Ž.Ž.Ž.Ž C3‘)’Y3“4”3“]•g–]—˜’9’]™…šF”3›Šœ
PHONE
FAX
AVX
SUPPLIER
843-444-2863
843-626-3123
Coilcraft
847-639-6400
847-639-1469
Digi-Key
218-681-6674
218-681-3380
EF Johnson
402-474-4800
402-474-4858
Murata
415-964-6321
415-964-8165
Note: Please indicate that you are using the MAX3658A
when ordering from these suppliers.
_________________________________________________________________Maxim Integrated Products
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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+3.3V power supply with 100mA current capability
1)
Connect a signal source to J11 (IN1 AC). Set the
signal amplitude to 960mVP-P (Corresponding to
200µAP-P current into the TIA). Set the data rate to
622Mbps.
2)
Apply 100µA to the IN1 DC input (J7) using a DC
current source to emulate the DC component of the
input signal. A voltage source connected from J7 to
GND may be used if a DC current source is not
available.
Signal-source, 622Mbps capability
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Oscilloscope with at least 500MHz performance
3)
Connect OUT1+ (J10) and OUT1- (J9) to the 50Ω
inputs of a high-speed oscilloscope.
4)
Remove the shunt from J20 to enable the DC
cancellation loop.
Install the shunt on J28 to enable the average
current monitor.
Connect a +3.3V supply and ground to J2 SMB
terminal.
The differential signal at the oscilloscope should be
approximately 240mVP-P.
5)
6)
7)
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The MAX3658A accepts a DC-coupled input from a highspeed photodiode, for optical modulation amplitudes
ranging from -33dBm to 0dBm. The MAX3658A
evaluation board facilitates characterization of the
MAX3658A TIA with or without a photodiode. The
MAX3658A EV kit comes from the factory with a low input
current and a high input current setup. The user must
assemble the TO header sections, if used.
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The 8pin TDFN section provides photodiode emulation
using a simplified electrical photodiode model. The model
provides a 50Ω 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.
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The TO header assembly layout provides a userassembled interface for evaluation of 4 and 5 pin TO
headers. (See the MAX3658 datasheet for a suggested
TO header layout.)
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[email protected]
[email protected]
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The MAX3658A outputs are back terminated with 75Ω.
To facilitate interface with 50Ω equipment, the
MAX3658A EV Kit places external 150Ω termination
resistors in parallel with each output so that the EV Kit
will match a 50Ω environment.
Note that the output load has a direct effect on the overall
gain and output signal swing. Because of the external
150Ω resistors and the 50Ω environment, the overall gain
is reduced by 33%. If matching a 50Ω environment is not
critical, higher gain can be achieved by increasing the
load resistance.
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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:
IAVG =
10 ( PAVE / 10 )
ρ
1000
where ρ 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:
IINPUT = 2IAVE
(re − 1)
(re + 1)
For example, to emulate a signal with an average power
of -25dBm and an extinction ratio of 8 on the U1 electrical
circuit.
-25dBm optical power will produce 2.7µA of average
input current (assume a photodiode responsivity of
0.85A/W). Install a current meter between an external
DC source and the IN1 DC test point. Adjust the source
to provide 2.7µA.
The signal amplitude is 2IAVE(re-1)/(re+1) = 4.2µA. To
generate this current through the 4.5kΩ series input
resistors and the 300Ω internal resistance, set the signal
source to produce an input of 20mVP-P on the IN1 AC
input.
For evaluation using the U2 electrical circuit note that the
series input resistance is 748Ω along with a 300Ω
internal resistance.
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Remove the input resistors and shunt capacitor before
attempting noise measurements. With the input resistors
and shunt capacitor removed, the total capacitance at the
IN pin 0.5pF for the TDFN section.
2 ________________________________________________________________________________________
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VCC
J7
IN 1 _ D C
C5
.0 1 µF
J11
IN 1 _ A C
R 17
2 .3 7 k Ω
C9
.0 2 2 µF
ˆ
C3
2200p F
Š‹
TP7
1
R 16
2 .3 7 k Ω
2
R0
1 .5 k Ω
R1
3 kΩ
R 12
5 1 .1 Ω
†‰
C2
100pF
3
4
TP2
F IL T 1
J20
R 24
1 .5 8 k Ω
VCC
IN
G ND
MAX3658AETA
F IL T
O UT-
O UT+
U1
MON
G ND
8
7
C8
1 µF
6
C4
1 µF
R5
150Ω
5
J16
IN 2 _ A C
C 11
.0 1 µF
R 18
2 .3 7 k Ω
C 10
.0 2 2 µF
R 13
5 1 .1 Ω

‘’
J2
SMB
C0
2 .2 µF
C 12
2200pF
C 13
100p F
TP6
T P 10
1
R 19
2 .3 7 kΩ
2
R5
374Ω
J6
R 25
1 .5 8 k Ω
R4
374Ω
3
4
TP5
F IL T 2
J4
VCC
IN
G ND
MAX3658AETA
F IL T
U2
MON
O UT-
O UT+
G ND
8
7
C 17
1 µF
6
C 14
1 µF
R 11
150Ω
J13
O U T 2R 10
150Ω
5
J14
O U T 2+
T P 11
TP4
MO N2
C 29
.0 2 2 µF
J21
R 14
5 1 .1 Ω
R 20
2 .3 7 k Ω
R2
3kΩ
R3
1 .5 kΩ
Ž
J10
O U T 1+
L1
F E R R IT E B E A D
C1
0 .1 µF
J3
IN 2 _ D C
J9
O U T 1-
TP3
MO N1
J28
VCC
VCC
Œ
R9
150Ω
J22
R 21
2 .3 7 k Ω
Figure 1. MAX3658A EV Kit Schematic Diagram
_________________________________________________________________________________________
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²³
C6
1µF
J19
OUT5R34
150Ω
±
VCC2
¯°
«­¬®
¨
L2
FERRITE BEAD
C21
0.1µF
OUTJ15
SMB
C20
2.2µF
GND
U4
VCC2
VCC
J25
OUT5+
OUT+
C15
2200pF
C7
1µF
©ª
¨
¦§
TP1
MON4
R31
1.58kΩ
VCC2
C27
1µF
J30
MON
R29
150Ω
OUT-
U0
VCC
J23
OUT4-
J24
OUT4+
OUT+
TP9
C23
2200pF
C24
1µF
GND
R28
150Ω
Alternate Ground Point
TP0
MON3
VCC2
R30
1.58kΩ
C22
1µF
JU1
MON
R27
150Ω
OUT-
U3
VCC
J27
OUT3-
J26
OUT3+
OUT+
TP6
C18
2200pF
GND
C19
1µF
R26
150Ω
Figure 2. MAX3658A EV Kit Schematic Diagram - TO-Header Interface.
4 ________________________________________________________________________________________
R33
150Ω
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Figure 3. MAX3658A EV Kit Component
Placement Guide - Component Side
Figure 4. MAX3658A EV Kit PC Board Layout Solder Side
_________________________________________________________________________________________
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Figure 5. MAX3658A EV Kit PC Board Layout Ground Plane
Figure 6. MAX3658A EV Kit PC Board Layout Power 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.
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 2004 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.