ISL3333EVAL1Z Intersil, ISL3333EVAL1Z Datasheet - Page 4

• Manufacturer Part Number: ISL3333EVAL1Z
• Description: EVAL BOARD 1 FOR ISL3333
• Manufacturer: Intersil

Specifications of ISL3333EVAL1Z

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

“SPA”
setting. Table 1 details the jumper settings for each of the
speed options.
DRIVER TESTS (PORT 2)
R
outputs, and, if desired, a differential capacitive load may be
soldered on top of R
to GND) resistive and/or capacitive loads may be added at
positions “C
Ensure that the “DY2”
engage the 50Ω term resistor, connect the generator to the
“DY2 (NC)” BNC, and set the swing for 0V to 3V. Monitoring
test points “TP19” (input), and “TP3” and “TP7” (Y2 and Z2
outputs respectively) with a scope allows the Tx prop delays,
skews, and transition times to be measured. To view the
differential waveform, use the scope’s math function to
generate “Z-Y”.
To measure the Tx output enable and disable times, start
with the previous jumper configuration and move the
“DZ2/DE2 (NC)”
engage its 50Ω term resistor. Connect the generator to the
“DZ2/DE2 (NC)” BNC, and set the swing for 0 to 3V.
Monitoring test points “TP21” (input), and “TP3” and “TP7”
(Y2 and Z2 outputs respectively) with a scope allows the
enable and disable times to be measured. Note that the
differential termination resistor collapses the disabled
outputs.
EVALUATING DRIVER AND RECEIVER COMBINED
PERFORMANCE
Start with the default jumper configuration. Performance
through a cascaded Tx and Rx can easily be evaluated,
utilizing the external loopback function, by installing jumpers
“A2/Y2_LB
Tx output lines connect to the corresponding Rx input lines,
so the data driven on the Tx input (DY2) appears at the Rx
output (RA2).
DIfferential 120Ω resistors R
the Tx performance while driving a double terminated load.
INTERCONNECTING DRIVER AND RECEIVER WITH A
CABLE
To evaluate the performance of the Tx and Rx (Port 2)
interconnected by a cable, start with the default
configuration, connect one wire of a twisted pair between
test points “TP7” and “TP8”, and connect the other wire in
the pair between “TP3” and “TP4”. Ensure that the “DY2
(NC)”
13
TABLE 1. JMPR SETTINGS FOR Tx SPEED SELECTION
DATA RATE
provides a differential 120Ω load across the driver
(20)
(16)
115kbps
460kbps
20Mbps
jumper is in the “LOW” position to engage the
and “SPB”
(10)
3
” and “C
and “B2/Z2_LB (9). In this configuration, the
(19)
13
5
jumper to the “LOW” position to
(17)
(20)
. Alternatively, single ended (Y2 or Z2
”, if so desired.
J-SPA
jumpers for the desired Tx speed
jumper is in the “LOW” position to
“LOW”
“LOW”
13
“VH”
4
and R
(16)
14
allow evaluation of
“LOW” or “VH”
J-SPB
“LOW”
“VH”
Application Note 1470
(17)
50Ω term resistor, connect the generator to the “DY2 (NC)”
BNC, and set the swing for 0V to 3V. Monitoring test points
“TP19” (input), and test point “RA2 (NC)” (Rx output)
illustrates the overall input to output performance.
Resistors R
for the cable.
Basic RS-232 DC Evaluation (Port 1)
GENERAL OBSERVATIONS
To better evaluate the RS-232 mode I
disable the RS-485 drivers by moving jumper “DZ2/DE2
(NC)”
approximately 3.9mA after this change.
Note that RS-232 drivers and receivers are inverting by
definition.
Don’t use Port 2 for RS-232 evaluation without removing the
input and output differential termination resistors (R
R
RECEIVER TESTS
In the default configuration - (see “Functional Diagram
(Default Configuration)” on page 2) - RA1 (measure at the
“RA1(RB)” test point to the left of jumper (24)) and RB1
(measure at the “RB1(RA)” test point to the right of jumper
(1)) are high due to the A1 and B1 5kΩ input resistors to
GND.
To switch the port 1 Rx output states, install the A1 and B1
Rx bias jumpers, “J10”
(25)
switches RA1 and RB1 low. Removing the “RXBIAS-VCC”
jumper and connecting a power supply between the
“RXBIAS” banana jack and GND, allows this supply to set
the Rx input voltages, in case the user wants to evaluate the
Rx switching points. When finished, remove jumpers “J10”
and “J9”.
To disable the Rx outputs via the active low RXEN1 pin,
move jumper “RXEN1”
Return the “RXEN1” jumper to the “LOW” position, remove
the “RXBIAS” power supply, and reinstall the “RXBIAS-VCC”
jumper.
DRIVER TESTS
The RS-232 Tx outputs, Y1 and Z1, are high (≈ 6.2V) in the
default configuration, because DY1 and DZ1 are low. To
switch the output states (V
“DY1 (DZ/SLEW)”
the “VH” position. To evaluate the loaded driver output
voltages, configure Port 1 for “external loopback”, as
described previously (i.e., install jumpers
driver output is now loaded by an Rx input resistor, and the
output voltages still exceed ±5.5V.
14
), or the RS-232 waveforms will be severely distorted.
jumper now drives the Rx input voltages to V
(19)
to the "LOW" position. I
14
and R
(23)
13
provide source and load terminations
(2)
(15)
and “DZ1/DE1 (DY)”
OL
and “J9” (3). The “RXBIAS-VCC”
to the “VH” position.
≈ -5.7V), simply move the
CC
CC
should be
, it is a good idea to
(5)
(24)
and (6)). Each
jumpers to
CC
13
June 3, 2009
, which
AN1470.0
and