19-2264; Rev 0; 12/01
MAX3277 Evaluation Kit
General Description
The MAX3277 evaluation kit (EV kit) allows complete
evaluation of the MAX3277 transimpedance amplifier.
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 cali-
bration circuit that allows accurate bandwidth and jitter
measurements.
The MAX3277 EV kit is fully assembled and tested.
o
Fully Assembled and Tested
o
Includes Photodiode Emulation Circuit
o
Includes Calibration Circuit for Accurate
Bandwidth and Jitter Measurements
Features
Evaluates: MAX3277
Component List
DESIGNATION
C1
C2
C5–C9
C11, C12
J1–J5
J8
L1
R1, R6
R2, R5
R3, R4, R7, R8
TP1, TP2, J6, J7
U1
None
None
QTY
1
1
5
2
5
1
1
2
2
4
4
1
1
1
DESCRIPTION
0.01µF ±10% ceramic capacitor
(0402)
10µF ±10% tantalum capacitor
0.1µF ±10% ceramic capacitors
(0402)
1000pF ±10% ceramic capacitors
(0402)
SMA connectors, edge mount
(round contact)
1
×
2-pin header (0.1in center)
56nH inductor
Coilcraft 0805CS-560XKBC
49.9Ω ±1% resistors (0402)
1kΩ ±1% resistors (0402)
499Ω ±1% resistors (0402)
Test points
MAX3277U/D die
MAX3277 EV kit circuit board
MAX3275/MAX3277 data sheet
SUPPLIER
AVX
Coilcraft
Murata
Ventel
PART
MAX3277EVKIT
Ordering Information
TEMP RANGE
0°C to +85°C
IC PACKAGE
MAX3277UID
Chip On-Board
Component Suppliers
PHONE
843-444-2863
408-224-8566
415-964-6321
800-950-8365
FAX
843-626-3123
408-224-6304
415-964-8165
512-794-0087
Note:
Please indicate that you are using the MAX3277 when
contacting these component suppliers.
________________________________________________________________
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.
MAX3277 Evaluation Kit
Evaluates: MAX3277
Quick Start
1) Connect a signal source to IN (J3). Set the signal
amplitude to 50mV
P-P
(corresponding to 50µA
P-P
current into the TIA). This may require attenuation
between the source and the MAX3277 EV kit. The
signal should have a data rate of up to 2.125Gbps.
2) Apply 30µA to TP1 using a constant current source
to emulate the DC component of the input signal.
3) Connect OUT+ (J1) and OUT- (J2) to the 50Ω
inputs of a high-speed oscilloscope.
4) Remove the shunt from jumper J8 to enable DC
cancellation loop.
5) Connect a 3.3V supply to the VCC terminal (J6) and
ground to the GND terminal (J7).
6) The differential signal at the oscilloscope should be
approximately 165mV
P-P
.
mount resistors have parasitic capacitance that reduces
their impedance at frequencies above 1GHz. Changes
to R4 and R7 must be evaluated using the calibration
network.
Photodiode Emulation
Use the following procedure to emulate the high-speed
current signal generated by a photodiode:
1) Select the desired optical power (P
AVE
in dBm) and
extinction ratio (r
e
).
2) Calculate the average current (I
AVE
in Amps). Set the
DC current at TP1 to I
AVE
:
10
(
P
AVE
/
10
)
I
AVE
=
ρ
1000
(
ρ =
photodiode responsivity in A
/
W
)
3) Calculate the AC signal current (l
AC
) and adjust the
signal generator to obtain it:
r
−
1
I
AC
=
2I
AVE
e
r
e
+
1
For example:
To emulate a photodiode with an aver-
age power of -16dBm and an extinction ratio of 10:
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.
2) The AC signal current is 2 I
AVE
(r
e
- 1)/(r
e
+ 1) = 41µA.
To generate this current through the 1000Ω input
resistors, set the signal source to produce an output
level of 41µA (1000Ω) = 41mV
P-P
.
Detailed Description
The MAX3277 EV kit allows characterization of the
MAX3277 TIA without a photodiode. The MAX3277 is
designed to accept a DC-coupled input from a high-
speed photodiode. Diode currents can have 10µA
P-P
to
2mA
P-P
AC current with a DC component from 5µA 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 50Ω
lab source that delivers power to an on-board termina-
tion resistor. A current is then generated from the volt-
age signal by a resistor with low stray capacitance. The
effect of the DC photodiode current can be emulated
by a current source at TP1. An isolation resistor pre-
vents the DC source from loading the AC path.
The values of the series-resistive elements, R4 and R7,
have been selected carefully so that the bandwidth of
the transimpedance amplifier is not altered. Surface-
2
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