Datasheet
ADM4168E Data Sheet
Rev. 0 | Page 10 of 12
THEORY OF OPERATION
The ADM4168E is a dual RS-422 transceiver that operates from
a single 5 V ± 10% power supply. The ADM4168E is intended for
balanced data transmission and complies with TIA/EIA-422-B
and ITU-T recommendation V.11. Each device contains two
differential line drivers and two differential line receivers and
is suitable for full-duplex data transmission.
The receivers contain a fail-safe feature that results in a logic
high output state if the inputs are unconnected (floating).
The ADM4168E features a low propagation delay, ensuring
maximum baud rate operation. The balanced driver ensures
distortion-free transmission.
Another important specification is a measure of the skew
between the complementary outputs. Low skew enhances
the noise immunity of the system and decreases the amount
of electromagnetic interference (EMI).
TRUTH TABLES
Table 6. Abbreviations in Truth Tables
Letter Description
H High level
I Indeterminate
L Low level
X Irrelevant
Z High impedance (off)
Table 7. Transmitting (Each Driver)
Inputs Outputs
DE DI Z Y
H H L H
H L H L
L X Z Z
Table 8. Receiving (Each Receiver)
Inputs Output
A − B RO
≥ +0.2 V H
≤ −0.2 V L
−0.2 V < A − B < +0.2 V I
Inputs open H