MAX9121EVKIT Maxim Integrated, MAX9121EVKIT Datasheet - Page 3

• Manufacturer Part Number: MAX9121EVKIT
• Description: LVDS Interface IC Evaluation Kit for the MAX9121 MAX9122 MAX9123
• Manufacturer: Maxim Integrated

Specifications of MAX9121EVKIT

• Number Of Drivers: 4
• Number Of Receivers: 4
• Data Rate: 500 Mbps
• Operating Supply Voltage: 3 V to 3.6 V
• Maximum Power Dissipation: 755 mW
• Propagation Delay Time: 2.7 ns
• Supply Current: 25 uA

Table 3. Receiver Probing Connections
4) Connect a function generator that provides square
5) Turn on the power supply and enable the function
Note: For connections to verify every channel, see
Table 3.
The MAX9121 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 dif-
ference.
The MAX9121 EV kit contains two separate circuits that
can be operated with independent supplies after cutting
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
CHANNEL NAME
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 following setting:
a) Frequency = 10MHz
b
c) Duty cycle = 50%
generator, then verify the output signal (OUT1) on
the scope.
Channel 1
Channel 2
Channel 3
Channel 4
V
IL
= 1.10V, V
Using Separate Power Supplies
_______________________________________________________________________________________
IC OUTPUT
PIN NAME
IH
Detailed Description
IN1+
IN2+
IN3+
IN4+
= 1.30V
IN1-
IN2-
IN3-
IN4-
TESTING
POINT
IN1+
IN2+
IN3+
IN4+
IN1-
IN2-
IN3-
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 (-)
JU13, pins 2 (+) and 1 (-)
JU13, pins 3 (+) and 4 (-)
JU14, pins 2 (+) and 1 (-)
JU14, pins 3 (+) and 4 (-)
MAX9121 Evaluation Kit
power supply. In addition, if high-impedance delay test-
ing is to be performed, a 1.2V voltage supply is
required.
The MAX9121 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.
The MAX9121 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 JU2–JU5
(Table 1). JU2–JU5 can create DC internal input signals
to the driver. To use JU2–JU5 to create DC input sig-
nals, make sure termination resistors R2–R5 are
removed.
The MAX9121 EV kit also provides two kinds of input
media to the receiver circuit: SMA connector and twist-
ed-pair cable. Additional paired testing points (IN1+,
IN1-) (IN2+, IN2) (IN3+, IN3-) (IN4+, IN4-) are provided
for the twisted-pair cable connections. When twisted-
pair cables are used as the input media (twisted-pair
cables are soldered on testing points IN1-, IN1+…),
remove all 0Ω resistors R33–R40 to avoid signal reflec-
tion from the traces that connect 0Ω resistors to SMA
connectors.
The MAX9121 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.
OUTPUT
SIGNAL
OUT1
OUT2
OUT3
OUT4
Receiver Circuit Inputs
Driver Circuit Input
Output Signals
Input Signals
HEADER (2 PIN)
PROBING
JU25
JU26
JU27
JU28
3