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4-103239-0X2 Datasheet(PDF) 9 Page - Texas Instruments

Part No. 4-103239-0X2
Description  High-Performance Linear/Interface Products
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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 9 page
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Signal Paths
1-3
Introduction
Figure 1 - 2. SN65HVD22 Evaluation Module (EVM)
Note that the EVM printed circuit board includes a location (U1) for a full-duplex
transceiver. This allows for future EVM configurations using the same board.
1.2
Signal Paths
The signal paths on this EVM include coaxial connectors (J7 and J8) for
connecting to test equipment, and differential connection points (W17 and
W18) for connecting to an RS-485 bus. Two banana jacks (J17 and J18)
provide for power and ground connections. Jumpers (W3 and W4) in the circuit
can be used to set the transceiver enabling. Jumper W11 is used to select the
common-mode voltage (VCM) test conditions. Additional test points are
provided in the circuit to facilitate measurements of critical signals.
Table 1 - 1 lists the EVM connections.
Table 1 - 1. HVD22 EVM Connections
Connection
Label
Description
J17
Vcc2
Power supply for HVD22 device
J18
GND2
Power supply ground
J7
RECEIVER
Receiver output, R (pin 1)
J8
DRIVER INPUT
Driver input, D (pin 4)
P3, W17, W18
TRANSCEIVER I/O
RS-485 BUS I/O (pins 6 and 7)
TP3
R
Receiver output (pin 1)
TP4
Driver input, D (pin 4)
TP6
EXT_V2
Externally applied Vcm
W3
RECEIVER
Receiver enable, RE, (pin 2)
W4
DRIVER
Driver enable, DE, (pin 3)
W11
TRANSCEIVER VCM SELECT
Select between Vcm choices:
None, GND2, External




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