MAX3864EVKIT [MAXIM]
Evaluation Kit for the MAX3864 ; 评估板MAX3864\n
| 型号： | MAX3864EVKIT |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Evaluation Kit for the MAX3864
|
| 文件： | 总5页 (文件大小：149K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1790; Rev 0; 9/00
MAX3864 Evaluation Kit
General Description
Features
o Fully Assembled and Tested
The MAX3864 evaluation kit (EV kit) simplifies evalua-
tion of the MAX3864 transimpedance preamplifier.
o Includes Photodiode Emulation Circuit
The EV kit includes a circuit that emulates the high-
speed, current input signal that would be produced by
a photodiode.
Ordering Information
The MAX3864 EV kit is fully assembled and tested.
PART
TEMP. RANGE
IC PACKAGE
MAX3864EVKIT-SO -40°C to +85°C
8 SO
Component List
Component List
DESIGNATION
QTY
DESIGNATION
QTY
DESCRIPTION
DESCRIPTION
U4, U5
2
User-supplied optical modules
1000pF 10%, 25V (min)
ceramic capacitors (0603)
Murata GRM39X7R102K050A
C1, C2, C4, C7
4
SMA connectors (edge mount)
E.F. Johnson 142-0701-801 or
Digi-key J502-ND
J1−J5
5
1000pF 10%, 25V (min)
ceramic capacitors (0805)
Murata GRM40X7R102K050A
C10, C11
2
9
VCC, +15V,
GND
Test points
Digi-key 5000-ND
3
1
1
1
1
2-pin header (0.1in centers)
Digi-Key S1012-36-ND
0.1µF 10%, 25V (min)
ceramic capacitors (0603)
Murata GRM39X7R104K016A
JU1
JU2
C3, C5, C6,
C12−C17
470pF capacitor (0805)
Murata GRM40COG471J050A
33µF 10%, 25V (min)
tantalum capacitors
AVX TAJE336K025
C8, C9
R1, R9
R2, R10
2
2
4
Shunt for JU1
Digi-Key S9000-ND
None
None
200Ω 5% resistors (0603)
MAX3864 EV kit (Rev. A)
circuit board
510Ω 5% resistors (0402)
Note: R2 and R10 = two 510Ω
resistors in series
None
None
1
1
MAX3864 data sheet
MAX3864 EV kit data sheet
R3, R11
R4, R12
2
2
51Ω 5% resistors (0603)
1kΩ 5% resistors (0603)
1kΩ variable resistor
Bourns or Digi-Key 3296W-102-ND
R5
R6
1
1
1
1
2
1
1
1
Component Suppliers
5kΩ 5% resistor (0805)
SUPPLIER
PHONE
FAX
10kΩ variable resistor
Bourns or Digi-Key 3296W-103-ND
R7
AVX
843-444-2863
843-626-3123
Central
Semiconductor
R8
10kΩ 5% resistor (0805)
516-435-1110
415-964-6321
516-435-1824
415-964-8165
Ferrite beads
Murata BLM11A601S
Murata
L1, L2
U1
Note: Please indicate that you are using the MAX3864 when
contacting these component suppliers.
MAX3864ESA 8-pin SOIC
CMPT3906 PNP Transistor
Central Semiconductor
U2
U3
MAX400CSA 8-pin SOIC
________________________________________________________________ Maxim Integrated Products
1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
MAX3864 Evaluation Kit
Quick Start
Table 1. Recommended Resistor Values
1) Remove shunt from jumper JU1.
EVALUATION KIT
R1, R9
R2, R10
2) Connect a +3.3V supply to the VCC terminal and
ground to the GND terminal.
1020Ω (composed
of two 510Ω (0402)
resistors)
MAX3864EVKIT-SO
200Ω (0402)
3) Connect OUT+ and OUT- to the 50Ω inputs of a
high-speed oscilloscope.
4) Connect a signal source to INPUT. Set the signal
amplitude to 50mVp-p (this may require some attenu-
ation between the source and the MAX3864 EV kit.)
The signal should have a data rate between
1000Mbps and 2500Mbps.
resistors have parasitic capacitance that reduces their
impedance at frequencies above 1GHz. The user
should carefully evaluate any changes to R1 and R2.
Table 1 shows the recommended resistor values.
Photodiode Emulation
The following procedure can be used to emulate the
high-speed current signal generated by a photodiode:
5) The differential signal at the oscilloscope should be
between 75mVp-p and 150mVp-p.
Detailed Description
1) Select the desired average optical power (P
)
AVE
The MAX3864 is designed to accept a DC-coupled
input from a high-speed photodiode, with a total ampli-
tude of 10µA to 2mA. Unfortunately, high-speed current
sources are not common laboratory equipment. Also,
because the MAX3864 provides a DC bias for the
photodiode, it cannot be DC-coupled to signal sources.
To allow characterization without a photodiode, the
MAX3864 EV kit provides a simple circuit that emulates
a photodiode using common voltage output signal
sources.
and extinction ratio (r ).
e
2) Calculate the average current (I
and R5 to obtain it.
), and adjust R7
AVE
(P
AVE/
10)
10
I
=
ρ
AVE
1000
ρ = photodiode responsivity in A/W
in dBm
P
AVE
The connector at INPUT is terminated with 50Ω to
ground. This voltage is then AC-coupled to a resistance
in series with the MAX3864 input, creating an input cur-
rent. U2 and U3 form a simple DC current source that is
used to apply a DC offset to the input signal.
I
in Amps
AVE
3) Calculate the AC signal current, and adjust the sig-
nal generator to obtain it.
✕
I
= 2
I
(r - 1) / (r + 1)
AVE e e
INPUT
I
in Amps
INPUT
The values of the series resistive elements, R1 and R2,
have been carefully selected not to change the band-
width of the transimpedance amplifier. Surface-mount
Table 2. Connections, Adjustments, and Control
CONTROL
DESCRIPTION
VCC
Supply Voltage Connection (3.0V to 5.5V, 100mA current limit)
+15V
Supply Voltage Connection for Photodiode Emulator Circuit (+15V, 25mA)
Connection for Ground
GND
When shunted, the photodiode emulation circuit is active. This is a convenient location to measure
the emulated photodiode current.
JU1
R5
R7
Potentiometer. Fine adjustment of the DC current input.
Potentiometer. Coarse adjustment of the DC current input.
Connections for the MAX3864 Output Signal
OUT+, OUT-
INPUT
Input Connection for a Signal Generator
2
_______________________________________________________________________________________
MAX3864 Evaluation Kit
C7
1000pF
R12
1k
C16
0.1µF
NO GND PLANE
J5
J4
R9
R10
+15V
INPUT
200Ω
1020Ω
C17
0.1µF
R6
5k
R11
51Ω
1
2
R5
1k
FERRITE
L1
4
J6
2
3
3
1
2
3
+15V
C8
U3
6
1
33µF
U2
J8
MAX400
25V
2
R7
10k
C9
7
33µF
25V
FERRITE
L2
3
J7
+15V
J9
C4
VCC1
VCC2
R8
10k
JU1
1000pF
J10
C2
1000pF
C1
1000pF
R4
1k
1
2
3
4
8
7
6
5
C5
VCC1
V
GND
CC
0.1µF
J2
NO GND PLANE
R1
C3
0.1µF
N.C.
IN
OUT+
OUT+
U1
MAX3864
J3
J1
R2
OUT-
GND
OUT-
INPUT
1020Ω
200Ω
C6
0.1µF
FILTER
R3
51Ω
JU2
C14
C12
0.1µF
J12
0.1µF
J13
1
4
3
VCC2
V
OUT+
1
4
3
CC
V
OUT+
VCC2
CC
C10
1000pF
J11
U5
C11
1000pF
J14
U4
2
GND
OUT-
2
GND
OUT-
C15
0.1µF
C13
0.1µF
MAX3864CAN
MAX3864CAN
Figure 1. MAX3864 EV Kit Schematic
For example:
3) The signal amplitude is 2I
(r - 1) / (r + 1) =
AVE e e
16µA. To generate this current through the 2200Ω
1) Emulate a signal with an average power of -20dBm
and an extinction ratio of 10.
input resistors, set the signal source to produce an
✕
output level of 16µA 1220Ω = 20mVp-p.
2) -20dBm optical power will produce 10µA of aver-
age input current (assume photodiode responsivity
of 1A/W). Install a current meter at JU1. Adjust R7
and R5 until the current is 10µA.
_______________________________________________________________________________________
3
MAX3864 Evaluation Kit
1.0"
Figure 2. MAX3864 EV Kit Component Placement Guide
1.0"
1.0"
Figure 3. MAX3864 EV Kit PC Board Layout—Component Side
Figure 4. MAX3864 EV Kit PC Board Layout—Ground Plane
4
_______________________________________________________________________________________
MAX3864 Evaluation Kit
1.0"
1.0"
Figure 5. MAX3864 EV Kit PC Board Layout—Power Plane
Figure 6. MAX3864 EV Kit PC Board Layout—Solder Side
NOTES
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 _____________________5
© 2000 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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