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參數(shù)資料
| 型號： | ADM3493ARZ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 通用總線功能 |
| 英文描述： | 3.3 V Slew Rate Limited, Half Duplex RS-485/RS-422 Transceiver |
| 中文描述： | LINE TRANSCEIVER, PDSO8 |
| 封裝： | LEAD FREE, MS-012AA, SOIC-8 |
| 文件頁數(shù)： | 11/12頁 |
| 文件大?。?/td> | 233K |
| 代理商： | ADM3493ARZ |
ADM3493
CIRCUIT DESCRIPTION
The ADM3493 is a low power transceiver for RS-485 and
RS-422 communications. The ADM3493 can transmit and
receive at data rates up to 250 kbps in a half duplex
configuration. Driver Enable (DE) and Receiver Enable (RE)
pins are included when disabled; the driver and receiver
outputs are high impedance.
Table 5. Transmitting Truth Table
Transmitting Inputs
Rev. 0 | Page 11 of 12
Transmitting
Outputs
B
0
1
High-Z
2
High-Z
2
RE
X
1
X
1
0
1
DE
1
1
0
0
DI
1
0
X
1
X
1
A
1
0
Mode
Normal
Normal
Normal
Shutdown
High-Z
2
High-Z
2
1
X = Don’t care.
2
High-Z = High Impedance.
Table 6. Receiving Truth Table
Receiving Inputs
Receiving
Outputs
RO
1
0
1
High-Z
2
RE
0
0
0
1
DE
0
0
0
0
A - B
≥+0.2 V
≤0.2 V
Inputs Open
X
1
Mode
Normal
Normal
Normal
Shutdown
1
X = Don’t care.
2
High-Z = High Impedance
REDUCED EMI AND REFLECTIONS
The ADM3493 is a slew rate limited transceiver, minimizing
EMI and reducing reflections caused by improperly terminated
cables.
LOW POWER SHUTDOWN MODE
A low power shutdown mode is initiated by bringing both RE
high and DE low. The ADM3493 does not shut down unless
both the driver and receiver are disabled (high impedance). In
shutdown, the ADM3493 typically draws only 2 nA of supply
current. For the ADM3493, the t
PSH
and t
PSL
enable times assume
the part was in the low power shutdown mode; the t
PZH
and t
PZL
enable times assume the receiver or driver was disabled, but the
part was not shut down.
DRIVER OUTPUT PROTECTION
Two methods are implemented to prevent excessive output
current and power dissipation caused by faults or by bus
contention. Current limit protection on the output stage
provides immediate protection against short circuits over the
whole common-mode voltage range (see Typical Performance
Characteristics). In addition, a thermal shutdown circuit forces
the driver outputs into a high impedance state if the die
temperature rises excessively.
PROPAGATION DELAY
Skew time is simply the difference between the low-to-high and
high-to-low propagation delay. Small driver/receiver skew times
help maintain a symmetrical mark-space ratio (50% duty cycle).
The receiver skew time, |t
PRLH
- t
PRHL
|, is 20 ns for the ADM3493.
The driver skew time is typically under 100 ns.
TYPICAL APPLICATIONS
The ADM3493 transceiver is designed for bidirectional data
communications on multipoint bus transmission lines. Figure
22 shows a typical network application’s circuits. To minimize
reflections, the line should be terminated at both ends in its
characteristic impedance, and stub lengths off the main line
should be kept as short as possible. The slew rate limited
ADM3493 is tolerant of imperfect termination.
B
A
R
D
RO
RE
DI
DE
ADM3493
ADM3493
ADM3493
ADM3493
B
A
R
D
RO
RE
DI
DE
B
A
R
D
RO
RE
DI
DE
B
A
R
D
RO
RE
DI
DE
0
MAXIMUM NUMBER OF TRANSCEIVERS ON BUS = 256
R
T
R
T
NOTES
1. R
T
IS EQUAL TO THE CHARACTERISTIC IMPEDANCE OF THE CABLE.
V
CC
R1
R2
Figure 28. ADM3493 Typical Half Duplex RS-485 Network
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