MAX9121EVKIT Maxim Integrated, MAX9121EVKIT Datasheet - Page 4

• 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

The MAX9121 EV kit is designed for direct differential
probing connections. Table 2 lists the direct probing
connections on the respective pins for all input and out-
put signals and their respective testing points. Table 3
lists the receiver probing connections.
The MAX9121 EV kit has two enables and two disables.
All enables and disables can be controlled by either
jumpers or external signals. Jumpers JU1, JU6, JU15,
and JU20 provide a DC logic signal to drivers EN, EN,
and receivers EN and EN, respectively (Table 4).
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
be added on DEN, REN, DEN, and REN pads with
49.9Ω termination resistors R1, R6, R23, and R24.
Before connecting external signals to DEN, REN,
DEN, and REN, verify there are no shunts across
jumpers JU1, JU6, JU15, and JU20.
To evaluate LVDS differential line driver (MAX9123) and
receiver (MAX9121) together, remove 0Ω resistors
R33–R40 at the input of the receiver circuit, and remove
capacitors C16–C23 and 49.9Ω termination resistors
R7–R14 at the output of the driver. Use 100Ω twisted-
pair cable (such as CAT-5) to connect the driver out-
puts to the receiver inputs. Connect one end of the
twisted-pair cable to test point DOUT1- and another
end to IN1- together, etc. Connect function generator(s)
to driver input(s), and probe at receiver or driver I/Os.
MAX9121 Evaluation Kit
Table 4. JU1, JU6, JU15, and JU20
Setting and Enable/Disable Logic Level
4
JUMPER
JU1, JU6,
JU15,
JU20
_______________________________________________________________________________________
1 and 2, connected to V
2 and 3, connected to GND
Open, no shunt
SHUNT LOCATION
Evaluating Driver and
Probing Connections
Receiver Together
CC
Enable/Disable
ENABLE/DISABLE
LOGIC LEVEL
High
Float
Low
Follow these steps to verify board operation.
Do not turn on the power supply until all connec-
tions are completed:
1) Verify that shunts are across JU1 and JU15 pins 1
2) Connect function generator to the driver input DIN1
3) Connect a scope probe across jumper JU25 (OUT1).
4) Single power supply (for the normal operation):
5) Turn on the power supply(ies), enable the function
Note: For connections to verify every channel, see
Tables 2 and 3.
The MAX9121 EV kit can also evaluate the MAX9122, a
differential line receiver with 107Ω internal termination
resistors. To evaluate the MAX9122, replace
MAX9121EUE with a MAX9122EUE and remove the
external 100Ω resistors R25–R28.
Table 5. Enable and Disable Truth Table
and 2.
with the following setting:
a) Frequency = 10MHz
b) V
c) Duty cycle = 50%
Use 100Ω twisted-pair cable to connect the driver
outputs to the receiver inputs as shown in Figure 1.
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.
generator, and verify the output.
DEN (REN)
High
High
IL
All other combinations
= 0.00V, V
IH
DEN (REN)
Evaluating the MAX9122
= 3.00V
Float
Low
U1 (U2) disable
U1 (U2) enable
U1 (U2) enable
OPERATION
FUNCTION