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ADM3072E Datasheet(PDF) 15 Page - Analog Devices

Part No. ADM3072E
Description  3.3 V, ±15 kV ESD-Protected, Half- and Full-Duplex, RS-485/RS-422 Transceivers
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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ADM3072E Datasheet(HTML) 15 Page - Analog Devices

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ADM3070E/ADM3071E/ADM3072E/ADM3073E/ADM3074E/ADM3075E/ADM3076E/ADM3077E/ADM3078E
Rev. A | Page 15 of 20
CIRCUIT DESCRIPTION
The ADM307xE series are high speed transceivers for RS­485
and RS-422 communications. Each device contains one driver
and one receiver. All devices feature fail-safe circuitry, which
guarantees a logic high receiver output when the receiver inputs
are open or shorted or when they are connected to a terminated
transmission line with all drivers disabled (see the Receiver Fail-
Safe section). The ADM307xE also feature a hot-swap capa-
bility, allowing line insertion without erroneous data transfer
(see the Hot-Swap Capability section). The ADM3070E/
ADM3071E/ADM3072E feature reduced slew rate drivers that
minimize EMI and reduce reflections caused by improperly
terminated cables, allowing for error-free data transmission at
rates up to 250 kbps.
The ADM3073E/ADM3074E/ADM3075E also offer slew rate
limits, allowing transmit speeds up to 500 kbps. The ADM3076E/
ADM3077E/ADM3078E driver slew rates are not limited,
making possible transmit speeds of up to 16 Mbps. The
ADM3072E/ADM3075E/ADM3078E are half-duplex trans-
ceivers; the ADM3070E/ADM3071E/ADM3073E/ADM3074E/
ADM3076E/ADM3077E are each full-duplex transceivers. All
devices operate from a single 3.3 V supply. Drivers are output
short-circuit current limited, and thermal shutdown circuitry
protects drivers against excessive power dissipation. When
activated, the thermal shutdown circuitry places the driver
outputs into a high impedance state.
FUNCTION TABLES
ADM3070E/ADM3073E/ADM3076E
Table 8. Transmitting Truth Table
Transmitting Inputs
Transmitting Outputs
RE
DE
DI
Y
Z
X1
1
1
1
0
X1
1
0
0
1
0
0
X1
High-Z2
High-Z2
1
0
X1
Shutdown
Shutdown
1 X = don't care.
2 High-Z = high impedance.
Table 9. Receiving Truth Table
Receiving Inputs
Receiving Outputs
RE
DE
A – B
RO
0
X1
≥ −50 mV
1
0
X1
≤ −200 mV
0
0
X1
Open/shorted
1
1
1
X1
High-Z2
1
0
X1
Shutdown
1 X = don't care.
2 High-Z = high impedance.
ADM3071E/ADM3074E/ADM3077E
Table 10. Transmitting Truth Table
Transmitting Input
Transmitting Outputs
DI
Y
Z
1
1
0
0
0
1
Table 11. Receiving Truth Table
Receiving Input
Receiving Output
A – B
RO
≥ −50 mV
1
≤ −200 mV
0
Open/shorted
1
ADM3072E/ADM3075E/ADM3078E
Table 12. Transmitting Truth Table
Transmitting Inputs
Transmitting Outputs
RE
DE
DI
A, Y
B, Z
X1
1
1
1
0
X1
1
0
0
1
0
0
X1
High-Z2
High-Z2
1
0
X1
Shutdown
Shutdown
1 X = don't care.
2 High-Z = high impedance.
Table 13. Receiving Truth Table
Receiving Inputs
Receiving Output
RE
DE
A – B
RO
0
0
≥ −50 mV
1
0
0
≤ −200 mV
0
0
0
Open/shorted
1
1
1
X1
High-Z2
1
0
X1
Shutdown
1 X = don't care.
2 High-Z = high impedance.
RECEIVER FAIL-SAFE
The ADM307xE family guarantees a logic high receiver output
when the receiver inputs are shorted, open, or connected to a
terminated transmission line with all drivers disabled. This is
done by setting the receiver input threshold between −50 mV
and −200 mV. If the differential receiver input voltage (A − B) is
greater than or equal to −50 mV, RO is logic high. If A − B is
less than or equal to −200 mV, RO is logic low. In the case of a
terminated bus with all transmitters disabled, the receiver
differential input voltage is pulled to 0 V by the termination.
With the receiver thresholds of the ADM307xE family, this
results in a logic high with a 50 mV minimum noise margin.


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