MAX3744EVKIT [MAXIM]
Evaluation Kit; 评估套件
| 型号： | MAX3744EVKIT |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Evaluation Kit |
| 文件： | 总4页 (文件大小：204K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-2969; Rev 0, 8/03
MAX3744/MAX3745 Evaluation Kit
________________________ Features
______________ General Description
The MAX3744/MAX3745 evaluation kit (EV kit) allows
complete evaluation of both versions of 2.7Gbps
transimpedance amplifiers.
Fully Assembled and Tested
Includes Photodiode Emulation Circuit
Calibration Circuit for Accurate Bandwidth
Measurement
The EV kit includes a circuit that emulates the high speed,
zero-to-peak current input signal that would be produced
by a photodiode. The kit also includes a calibration circuit
that allows accurate bandwidth measurement.
_______________Ordering Information
PART
TEMP RANGE
IC-PACKAGE
The MAX3744/MAX3745 EV kit is fully assembled and
tested.
MAX3744EVKIT
MAX3745EVKIT
-40°C to +85°C
-40°C to +85°C
Die
Die
________________________________________Electrical Evaluation Component List
DESIGNATION
QTY
DESCRIPTION
DESIGNATION
QTY
DESCRIPTION
56nH inductor
Coilcraft 1008CS-560XKBC
2-pin header, 0.1in centers
SMA connectors, round,
Johnson 142-0701-801
Test Points
MAX3744E/D
MAX3744 EV board
MAX3745E/D
MAX3745 EV board
0.01mF ±10% ceramic
capacitors (0201)
0.1mF ±10% ceramic
capacitors (0402)
10mF ±10% 10V min
ceramic capacitor
33mF ±5% 10V min
tantalum capacitor
C3, C5, C6
3
L1
JU1
1
1
5
4
C4, C7, C8,
C10, C11
5
1
1
4
J3-J7
TP1-TP4
C2
C1
U1
1
0
R3, R4, R11,
R12
499W ±1% resistor (0402)
Outside Vendor
Supply
Outside Vendor
Supply
R5, R8
R6, R7
2
2
4.99kW ±1% resistor (0402)
53.6W ±1% resistor (0402)
49.9W ±1% resistor (0402)
MAX3744 EV board
Not installed
1mil Au wire (8 bonds)
0
1
Epoxy, Ablefilm 84-1 LMI
R9, R10
2
None
Shunt
MAX3744 EV board
MAX3745 EV board
None
None
1
24.9W ±1% resistor (0402)
MAX3744 EV board
MAX3745 EV board
R13, R14
R15, R16
2
2
0W shunt resistor (0402)
MAX3745 EV board
MAX3744/MAX3745
Data Sheet
1
10kW ±1% resistor (0402)
__________________________________________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.
MAX3744/MAX3745 Evaluation Kit
the transimpedance amplifier is not altered. Surface-
mount resistors have parasitic capacitance that may
reduce their impedance at frequencies above 1GHz.
_____________Component Suppliers
SUPPLIER
AVX
PHONE
FAX
____________Photodiode Emulation
The following procedure can be used to emulate the
high-speed current signal generated by a photodiode:
803-946-0690
847-639-6400
814-237-1431
803-626-3123
847-639-1469
814-238-0490
Coilcraft
Murata
1) Select the desired optical power (PAVE, dBm) and
extinction ratio (re).
Note: Please indicate that you are using the
MAX3744/MAX3745 when contacting thes e component
suppliers.
2) Calculate the average current (IAVE, A). Set the DC
current at TP1 to IAVE
.
________________________Quick Start
/10)
10(P
AVE
IAVE
=
×r
1) Connect a signal source to IN at J3. Set the signal
amplitude to 100mVp-p (this may require some
attenuation between the source and the
MAX3744/MAX3745 EV kit.) The signal should
have a data rate of 2.5Gbps.
1000
(?= photodiode responsivity in A/W)
3) Calculate the AC signal current and adjust the
signal generator to obtain it.
2) Connect OUT+ and OUT- to the 50O inputs of a
high-speed oscilloscope at J6 and J7.
re - 1
IAC = 2× IAVE
×
3) Remove the shunt from jumper JU1.
re +1
4) Connect a +3.3V supply to the VCC terminal and
ground to the GND terminal.
For example: To emulate a photodiode with an average
power of –16dBm and an extinction ratio of 10;
5) The differential signal at the oscilloscope should
be greater than 280mVp-p (140mVp-p on
MAX3744 EV Kit).
1) –16dBm optical power will produce 25µA of
average input current (assume photodiode
responsivity of 1A/W). Set the DC current input to
25µA at TP1.
______________Detailed Description
2) The signal amplitude is 2 I
(re-1)/(re+1)=41µA.
AVE
The MAX3744/MAX3745 EV kit allows characterisation
without a photodiode. The kit is designed to emulate a
DC-coupled photodiode input. Diode currents may
To generate this current through the 1000O input
resistors, set the signal source to produce an
output level of
have 6uApp to 2mA AC-current with a DC component
pp
41µA*1000 O = 41mVp-p.
from 10uA to 1mA. The high-speed current source of
the photodiode is emulated on the EV kit using
separate AC and DC paths. The AC signal is supplied
from a standard 50O lab source that delivers power to
an on board termination resistor. A current is then
generated from the voltage signal by a resistor with low
stray capacitance. The effect of the DC photodiode
current may be emulated by a current source at TP1.
An isolation resistor prevents the DC source from
loading the AC path.
______________Noise Measurement
Remove R3 and R4 before attempting noise
measurements to minimize input capacitance. With R3
and R4 removed the total capacitance at the IN pin is
approximately 0.85pF.
__________________RSSI (MAX3744)
The Average Power at the MAX3744 input is indicated
by the common mode output measured at TP2 and
TP3. Refer to the MAX3744 data sheet for details.
The values of the series resistive element, R3 and R4,
have been carefully selected so that the bandwidth of
_____________________________________Adjustments and Control Descriptions
COMPONENT
NAME
FUNCTION
JU1
TP1
OFFSET CORRECTION
DC CURRENT INPUT
Instal JU1 to disable offset correction.
Apply DC current for photodiode simulation.
MAX3744 RSSI Signal
TP2, TP3
OUTPUT COMMON MODE
2 _________________________________________________________________________________________
MAX3744/MAX3745 Evaluation Kit
VCC VCC
For MAX3745
Leave R9 and R10 Open
R10
49W
R9
49W
TP2
TP3
R16
R15
10kW
10kW
L1
VCC
TP4
10
GND
56nH
1
J1
J2
VCC
NC
C1
C2
10mF
C3
C10
R14
2
3
9
33mF
0.01mF
J6
J7
OUT+
OUT-
24.9W
0.1mF
VCCZ
IN
C4
For MAX3745
Short R13, R14
0.1mF
R3
R4
MAX3744/
MAX3745
4
J3
R13
C11
499W 499W
JU1
TP1
8
R6
R5
24.9W
4.99kW
0.1mF
53.6W
5
FILTER
GND
6
NC
C5
7
0.01mF
C7
0.1mF
C8
0.1mF
R12
R11
J4
J5
499W 499W
R7
53.6W
R8
4.99kW
C6
0.01mF
Figure 1. MAX3744/MAX3745 EV Kit Schematic
Figure 2. MAX3744/MAX3745 EV Kit PC Component Placement Guide—Component Side
_______________________________________________________ 3
MAX3744/MAX3745 Evaluation Kit
Figure 3. MAX3744/MAX3745 EV Kit
PC Board Layout—Component Side
Figure 5. MAX3744/MAX3745 EV Kit
PC Board Layout—Power Plane
Figure 4. MAX3744/MAX3745 EV Kit
PC Board Layout—Ground Plane
Figure 6. MAX3744/MAX3745 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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600___________________4
Ó 2003 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products
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