19-2302; Rev 0; 1/02
MAX9124 Evaluation Kit
General Description
The MAX9124 evaluation kit (EV kit) contains a low-volt-
age differential signaling (LVDS) quad differential line
driver (MAX9124) and receiver (MAX9125). The differ-
ential line driver accepts LVTTL or LVCMOS inputs and
translates them to LVDS output signals. The receiver
accepts LVDS inputs and translates them to single-
ended LVCMOS outputs. Both circuits operate with
high data rates and low power dissipation.
The MAX9124 EV kit is designed with 50Ω controlled-
impedance traces in a four-layer PC board. It is spe-
cially designed for direct differential probing of the
LVDS I/O. Connection points are provided for the
attachment of a cable to carry the LVDS signals.
The EV kit operates from a single 3.3V supply. In addi-
tion, a 1.2V power-supply input is provided for testing the
driver’s high-impedance propagation delays. A separate
supply option for the driver and receiver allows testing of
the common-mode performance of the receiver.
The MAX9124 EV kit can also be used to evaluate the
MAX9126, which is the same as the MAX9125 but with
integrated 115Ω (nominal) termination resistors.
Additional pads on the board are provided for dynami-
cally driving the enable and disable control signals with
a pulse generator.
Features
o
Independent Quad Driver (MAX9124) and Quad
Receiver (MAX9125/MAX9126) Circuits
o
>500Mbps (250MHz) Switching Rate
(MAX9125/MAX9126)
>800Mbps (400MHz) Switching Rate (MAX9124)
o
Supports Testing of Twisted-Pair Cables
o
50Ω Controlled-Impedance Signal Traces
o
16-Pin TSSOP Package
o
Fully Assembled and Tested
Evaluates: MAX9124/MAX9125/MAX9126
Ordering Information
PART
MAX9124EVKIT
TEMP RANGE
0°C to +70°C
IC PACKAGE
16 TSSOP
Note:
To evaluate the MAX9126, request a MAX9126EUE free
sample with the MAX9124EVKIT.
Component List
DESIGNATION
QTY
DESCRIPTION
10µF
±10%,
10V tantalum
capacitors (case B)
AVX TAJB106K010R or
Kemet T494B106K010AS
1000pF
±10%,
50V X7R ceramic
chip capacitors (0402)
Murata GRM36X7R102K050A
0.1µF
±10%,
16V X7R ceramic
chip capacitors (0603)
Murata GRM39X7R104K016A
5.1pF
±0.1pF,
50V ceramic chip
capacitors (0402)
Murata GRM36COG5R1B050A
49.9Ω
±1%
resistors (0402)
Not installed, open resistor pads
(0402)
100Ω
±1%
resistors (0402)
2.0kΩ
±1%
resistors (0603)
0Ω resistors (0603)
DESIGNATION
R41–R48
R49, R50
JU1–JU6,
JU15–JU20
JU7–JU14
JU21–JU28
DEN,
DEN,
REN,
REN
DIN1–DIN4,
RIN1- to RIN4-,
RIN1+ to RIN4+
U1
U2
0
4
4
8
None
None
None
None
QTY
0
0
12
8
8
0
DESCRIPTION
Not installed, open resistor pads
(0603)
Not installed, shorted resistor
pads (0603)
3-pin headers
4-pin headers
2-pin headers
Not installed, SMA edge-mount
connectors
SMA edge-mount connectors
MAX9124EUE (16-pin TSSOP)
MAX9125EUE (16-pin TSSOP)
Shunts
MAX9124 PC board
MAX9124 EV kit data sheet
MAX9124/MAX9125 data sheet
C1, C4, C9
3
C2, C11
2
C3, C5–C8, C10
6
C12–C23
R1, R2, R3,
R5–R10, R12–R16,
R18–R21, R23, R24
R4, R11, R17,
R22
R25–R28
R29–R32
R33–R40
12
12
1
1
8
1
1
1
20
________________________________________________________________
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.
MAX9124 Evaluation Kit
Evaluates: MAX9124/MAX9125/MAX9126
Component Suppliers
SUPPLIER
AVX
Kemet
Murata
PHONE
803-943-0690
408-986-0424
814-237-1431
FAX
803-626-3123
408-986-1442
814-238-0490
Follow the steps below to verify receiver circuit opera-
tion.
Do not turn on the power supply until all con-
nections are completed:
1) Verify that a shunt is across jumper JU16 (EN) pins 1
and 2.
2) Connect a scope probe across JU25 (OUT1) to
observe the output signal.
3) Connect a function generator that provides square
waves to the input of the receiver circuit (connect the
noninverting signal to SMA connector RIN1+ and the
inverting signal to SMA connector RIN1-) with the fol-
lowing settings:
a) Frequency = 10MHz
b) V
IL
= 1.10V, V
IH
= 1.30V
c) Duty cycle = 50%
4) Connect a 3.3V, 400mA power supply to the VCC2
pad. Connect the supply ground to the GND pad
closest to VCC2.
5) Turn on the power supply and enable the function
generator, then verify the output signal (OUT1) on the
scope.
Note:
For connections to verify every channel, see
Table 3.
Note:
Please indicate that you are using the MAX9124/MAX9125/
MAX9126 when contacting these component suppliers.
Quick Start
The MAX9124 EV kit is a fully assembled and tested
surface-mount board. The EV kit contains an LVDS dif-
ferential line driver located on the upper-half circuit,
and receiver located on the lower-half circuit.
Recommended equipment includes:
• DC power supplies: one 3.3V ±0.3V, 400mA (or two
3.3V ±0.3V, 200mA supplies for powering the driver
and receiver independently with R49 and R50
shorts cut open)
•
•
•
Signal generator for LVDS signal input (e.g., HP
8131A)
Differential probe (e.g., Tektronix P6248)
Digital sampling oscilloscope or logic analyzer
(e.g., Tektronix 11801C)
Detailed Description
The MAX9124 EV kit is a fully assembled and tested
circuit board that includes a quad LVDS differential line
driver and receiver. The EV kit has two independent cir-
cuits. The upper-half circuit is a driver circuit and the
lower-half circuit is a receiver circuit. The two circuits
can be operated together or separately. Both circuits’
I/Os are specially designed for direct probing.
The EV kit is a four-layer PC board with 50Ω controlled-
impedance traces for all input signal traces with 49.9Ω
termination resistors. The two circuits can be linked by
connecting an output signal from the driver circuit to the
input of the receiver circuit. Each differential input pair
traces are laid out with less than 100mil length difference.
Evaluating the Driver (MAX9124) Circuit
Follow the steps below to verify driver circuit operation.
Do not turn on the power supply until all connec-
tions are completed:
1) Verify that a shunt is across pins 1 and 2 of JU2 (EN).
2) Connect a differential probe across pins 2 and 3 of JU7.
3) Connect a function generator that provides a square
wave to the input of the driver circuit SMA connector
DIN1 with the following settings:
a) Frequency = 10MHz
b) V
IL
= 0.00V, V
IH
= 3.00V
c) Duty cycle = 50%
4) Connect a 3.3V, 400mA power supply to the VCC1
pad. Connect the supply ground to the GND pad
closest to VCC1.
5) Turn on the power supply, enable the function gener-
ator, and verify the differential output signal V
OD
=
(OUT1+ - OUT1-).
Note:
For connections to verify every channel, see
Table 2.
Using Separate Power Supplies
The MAX9124 EV kit contains two separate circuits that
can be operated with independent supplies after cut-
ting open the shorts at R49 and R50. Independent
power and ground planes allow measurements of the
receivers’ response to ground shift or other common-
mode effects. Each circuit requires a 3.3V, 200mA
power supply. In addition, if high-impedance delay
testing is to be performed, a 1.2V voltage supply is
required.
Evaluating the Receiver
(MAX9125) Circuit
2
_______________________________________________________________________________________
MAX9124 Evaluation Kit
Input Signal
The MAX9124 EV kit provides internal DC or external
AC input signals to the driver circuit and two kinds of
input media, SMA coax or twisted-pair cable, to the
receiver circuit.
Driver Circuit Input
The MAX9124 EV kit accepts both internal (DC) and
external (AC) inputs to the driver circuit.
Before driving
AC external input signals to DIN1–DIN4 to the driver
circuit, verify there are no shunts across JU1, JU3,
JU4, and JU6 (Table 1).
JU1, JU3, JU4, and JU6 can
create DC internal input signals to the driver.
To use
JU1, JU3, JU4, and JU6 to create DC input signals,
make sure termination resistors R1, R7, R8, and R14
are removed.
Receiver Circuit Input
The MAX9124 EV kit also provides two interconnect
options to the receiver circuit: coaxial cable and twist-
ed-pair cable. When 49.9Ω termination resistors R15,
R16, R18–R21, and R23, R24 are installed, the fail-safe
feature is disabled. To test the fail-safe feature, remove
termination resistors R15, R16, R18–R21, and R23,
R24. Additional paired testing points (IN1+, IN1-) (IN2+,
IN2-) (IN3+, IN3-) (IN4+, IN4-) are provided for the twist-
ed-pair cable connections. When twisted-pair cables are
used as the input media (twisted-pair cables are sol-
dered on testing points IN1-, IN1+, etc.), remove all 0Ω
resistors R33–R40 to avoid signal reflection from the
traces that connect 0Ω resistors to SMA connectors.
Evaluates: MAX9124/MAX9125/MAX9126
Output Signal
The MAX9124 EV kit is designed for direct probing of
all output signals. Additional paired testing points
(DOUT1-, DOUT1+), (DOUT2+, DOUT2-), (DOUT3+,
DOUT3-), (DOUT4+, DOUT4-) are also provided for
connection of twisted-pair cables and probing of the
driver outputs.
Table 1. Using JU1, JU3, JU4, and JU6 to
Provide Input Signals to the Driver Circuit
JUMPER
SHUNT
LOCATION
1 and 2
2 and 3
1 and 2
2 and 3
1 and 2
2 and 3
1 and 2
2 and 3
IN PIN
Connected to V
CC
Connected to GND
Connected to V
CC
Connected to GND
Connected to V
CC
Connected to GND
Connected to V
CC
Connected to GND
DRIVER
INPUT
SIGNAL
IN1 = high
IN1 = low
IN2 = high
IN2 = low
IN3 = high
IN3 = low
IN4 = high
IN4 = low
Probing Connections
The MAX9124 EV kit is designed for direct differential
probing connections. Tables 2 and 3 list the direct
probing connections on the respective pins for all input
and output signals and their respective testing points.
Enable/Disable
The MAX9124 EV kit has two enables and two disables.
All enables and disables can be controlled by either
jumpers or external signals. Jumpers JU2, JU5, JU16,
and JU19 provide a DC logic signal to driver’s EN and
EN
and receiver’s EN and
EN,
respectively (Table 4).
Table 5 is the enable/disable truth table.
The EV kit can also be controlled by external
enable/disable signal(s). To use external signals to
control enable and disable, SMA connectors need to
JU1
JU3
JU6
JU4
Table 2. Driver Probing Connections
CHANNEL NAME
Channel 1
Channel 2
Channel 3
Channel 4
IC OUTPUT
PIN NAME
OUT1+
OUT1-
OUT2+
OUT2-
OUT3+
OUT3-
OUT4+
OUT4-
TESTING
POINT
DOUT1+
DOUT1-
DOUT2+
DOUT2-
DOUT3+
DOUT3-
DOUT4+
DOUT4-
PROBING HEADER (4 PIN), PIN NO.
JU7, pins 2 (+) and 1 (-)
JU7, pins 3 (+) and 4 (-)
JU8, pins 2 (+) and 1 (-)
JU8, pins 3 (+) and 4 (-)
JU10, pins 2 (+) and 1 (-)
JU10, pins 3 (+) and 4 (-)
JU9, pins 2 (+) and 1 (-)
JU9, pins 3 (+) and 4 (-)
PROBING (OUT+ - OUT-)
JU7, pins 2 (+) and 3 (-)
JU8, pins 3 (+) and 2 (-)
JU10, pins 3 (+) and 2 (-)
JU9, pins 2 (+) and 3 (-)
_______________________________________________________________________________________
3
MAX9124 Evaluation Kit
Evaluates: MAX9124/MAX9125/MAX9126
Table 3. Receiver Probing Connections
CHANNEL NAME
Channel 1
Channel 2
Channel 3
Channel 4
IC OUTPUT
PIN NAME
IN1-
IN1+
IN2+
IN2-
IN3-
IN3+
IN4+
IN4-
TESTING
POINT
IN1-
IN1+
IN2+
IN2-
IN3-
IN3+
IN4+
IN4-
PROBING HEADER (4 PIN), PIN NO.
JU11, pins 2 (+) and 1 (-)
JU11, pins 3 (+) and 4 (-)
JU12, pins 2 (+) and 1 (-)
JU12, pins 3 (+) and 4 (-)
JU14, pins 3 (+) and 4 (-)
JU14, pins 2 (+) and 1 (-)
JU13, pins 3 (+) and 4 (-)
JU13, pins 2 (+) and 1 (-)
OUTPUT
SIGNAL
OUT1
OUT2
OUT3
OUT4
PROBING
HEADER (2 PIN)
JU25
JU26
JU28
JU27
be added on DEN, REN,
DEN,
and
REN
pads with
49.9Ω termination resistors R4, R17, R11, and R22.
Before connecting external signals to DEN, REN,
DEN, REN,
verify there are no shunts across
jumpers JU4, JU17, JU11, and JU22.
generator(s) to the driver input(s), and probe at receiv-
er or driver I/Os.
Follow these steps to verify board operation.
Do not
turn on the power supply until all connections are
completed:
1) Verify shunts across jumper JU2 (DEN) and JU16
(REN) pins 1 and 2.
2) Connect a function generator to the driver input DIN1
with the following settings:
a) Frequency = 10MHz
b) V
IL
= 0.00V, V
IH
= 3.00V
c) Duty cycle = 50%
3) Connect a scope probe across jumper JU25 (OUT1).
Use 100Ω twisted-pair cable to connect the driver
outputs to the receiver inputs as shown in Figure 1.
4) Single power supply (for the normal operation):
Connect a 3.3V, 400mA power supply to VCC1.
Connect the supply ground to the GND pad closest
to VCC1.
Optional separate power supplies (for testing
receiver common-mode response): Connect
3.3V, 200mA power supplies to VCC1 and VCC2.
Connect the supply grounds to the GND pads
closest VCC1 and VCC2, respectively. Be sure
R49 and R50 shorts are cut open.
5) Turn on the power supply (supplies), enable the
function generator, and verify the output.
Note:
For connections to verify every channel, see
Tables 2 and 3.
Evaluating Driver and
Receiver Together
Table 4. JU2, JU5, JU16, and JU19
Setting and Enable/Disable Logic Level
JUMPER
JU2, JU5,
JU16,
JU19
SHUNT LOCATION
1 and 2, connected to V
CC
2 and 3, connected to GND
Open, no shunt
ENABLE/DISABLE
LOGIC LEVEL
High
Low
Float
Table 5. Enable and Disable Truth Table
DEN (REN)
Low
DEN
(REN)
High
OPERATION
FUNCTION
U1 (U2) disable
U1 (U2) enable
All other combinations (including floating)
To evaluate the LVDS differential line driver (MAX9124)
and receiver (MAX9125) together, remove 0Ω resistors
R33–R40 at the input of the receiver circuit, and remove
capacitors C12–C19 and 49.9Ω termination resistors
R2, R3, R5, R6, R9, R10, R12, and R13 at the output of
the driver. Use 100Ω twisted-pair cable (such as CAT-
5) to connect the driver outputs to the receiver inputs.
Connect one end of the twisted-pair cable to test point
DOUT1- and another end to IN1-, etc. Connect function
Evaluating MAX9126
The MAX9124 EV kit can also evaluate the MAX9126, a
differential line receiver with 115Ω internal termination
4
_______________________________________________________________________________________
MAX9124 Evaluation Kit
Evaluates: MAX9124/MAX9125/MAX9126
MAX9124
DOUT1+
DIN1
DOUT1-
IN1-
IN1+
100Ω
MAX9125
OUT1
DOUT2+
DIN2
DOUT2-
IN2+
100Ω
IN2-
OUT2
DOUT3+
DIN3
DOUT3-
IN3+
100Ω
IN3-
OUT3
DOUT4+
DIN4
DOUT4-
IN4+
100Ω
IN4-
OUT4
DRIVER CIRCUIT (UPPER-HALF CIRCUIT)
RECEIVER CIRCUIT (LOWER-HALF CIRCUIT)
Figure 1. Twisted-Pair Cable Interconnect Diagram
resistors. To evaluate the MAX9126, replace
MAX9125EUE with a MAX9126EUE and remove the
external 100Ω resistors R25 to R28.
_______________________________________________________________________________________
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