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參數(shù)資料
| 型號： | MAX3292 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 32-Bit Digital Signal Controller with Flash 179-BGA MICROSTAR -40 to 125 |
| 中文描述： | RS-485/RS-422收發(fā)器，帶有預(yù)加重，用于高速、遠(yuǎn)距離通信 |
| 文件頁數(shù)： | 12/16頁 |
| 文件大?。?/td> | 285K |
| 代理商： | MAX3292 |
M
% J itter = (total jitter / t
BAUD
)
·
100
When the total amount of time skew becomes 10% or
more of the baud period, the data error rate can
increase sharply.
128 T ransc eivers on the Bus
The standard RS-485 receiver input impedance is 12k
(one unit load), and the standard driver can drive up to
32 unit loads. The MAX3291/MAX3292 transceivers have
a 1/4-unit-load receiver input impedance (48k
), allow-
ing up to 128 transceivers to be connected in parallel on
one communication line. Any combination of these
devices and/or other RS-485 transceivers with a total of
32 unit-loads or less can be connected to the line.
Low-Power S hutdown Mode
Initiate low-power shutdown mode by bringing
RE
high
and DE low. In shutdown the MAX3291/MAX3292 typi-
cally draw only 1μA of supply current.
Simultaneously driving
RE
and DE is allowed; the parts
are guaranteed not to enter shutdown if
RE
is high and
DE is low for less than 80ns. If the inputs are in this
state for at least 300ns, the parts are guaranteed to
enter shutdown.
Enable times t
ZH
and t
ZL
in the Switching Characteris-
tics tables correspond to when the part is not in the low-
power shutdown state. Enable times t
ZH(SHDN)
and
t
ZL(SHDN)
assume the parts are shut down. It takes dri-
vers and receivers longer to activate from the low-
power shutdown mode (t
ZH(SHDN)
, t
ZL(SHDN)
) than from
the driver/receiver disable mode (t
ZH
, t
ZL
).
Line Repeater
For line lengths greater than what one MAX3291/
MAX3292 can drive, use the repeater application
shown in Figure 17.
Figure 18 shows the system differential voltage for the
MAX3292 driving 4000 feet of 26AWG twisted-pair wire
into two 120
termination loads.
Line T ermination
The MAX3291/MAX3292 are targeted for applications
requiring the best combination of long cable length and
lowest bit-error rate. In order to achieve this combina-
tion, the cable system must be set up with care. There
are three basic steps:
1) The cable should only have two ends (no tree configu-
ration with long branches), which are terminated with
a simple resistor termination whose value is the
cable’s characteristic impedance (Z
O
). Avoid termina-
tions anywhere else along the cable. This ensures that
there are no reflections at the end of the cable, and
that all transmitters (whether they are located at the
ends of the cable or somewhere along the length) see
the same impedance, equal to Z
O
/ 2.
2) Make all branches or stubs short enough so that
twice the propagation delay along the stub (down
and back) is significantly less than one baud period
(around 15% or less). This ensures that the reflec-
tions from the end of the stub (which are unavoid-
able, since the stubs are not terminated) settle in
much less than a baud period. If the application
requires a branch much longer than this, use a
repeater (see the Line Repeatersection).
RS-485/RS-422 Transceivers with Preemphasis
for High-Speed, Long-Distance Communication
12
______________________________________________________________________________________
Figure 17. Line-Repeater Application
2
μ
s/div
V
A
- V
B
RO
DI
RECEIVER
INPUT
1V/div
5V/div
TYPICAL OPERATING CIRCUIT, R
PSET
= 1M
5V/div
120
120
DATA IN
DATA OUT
R
D
RO
RE
DE
DI
A
B
Z
Y
MAX3291
MAX3292
Figure 18. MAX3292 System Differential Voltage Driving 4000
Feet, Using Two 120
Termination Resistors
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| MAX3292CPD | 32-Bit Digital Signal Controller with Flash 176-LQFP -40 to 85 |
| MAX3292CSD | 32-Bit Digital Signal Controller with Flash 176-LQFP -40 to 125 |
| MAX3292EPD | RS-485/RS-422 Transceivers with Preemphasis for High-Speed, Long-Distance Communication |
| MAX3292ESD | RS-485/RS-422 Transceivers with Preemphasis for High-Speed, Long-Distance Communication |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX3292CPD | 功能描述:RS-422/RS-485 接口 IC RoHS:否 制造商:Maxim Integrated 數(shù)據(jù)速率:1136 Kbps 工作電源電壓:3 V to 5.5 V 電源電流:5.9 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-28 封裝:Tube |
| MAX3292CPD+ | 功能描述:RS-422/RS-485 接口 IC For Long-Distance Communication RoHS:否 制造商:Maxim Integrated 數(shù)據(jù)速率:1136 Kbps 工作電源電壓:3 V to 5.5 V 電源電流:5.9 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-28 封裝:Tube |
| MAX3292CSD | 功能描述:RS-422/RS-485 接口 IC RoHS:否 制造商:Maxim Integrated 數(shù)據(jù)速率:1136 Kbps 工作電源電壓:3 V to 5.5 V 電源電流:5.9 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-28 封裝:Tube |
| MAX3292CSD+ | 功能描述:RS-422/RS-485 接口 IC For Long-Distance Communication RoHS:否 制造商:Maxim Integrated 數(shù)據(jù)速率:1136 Kbps 工作電源電壓:3 V to 5.5 V 電源電流:5.9 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-28 封裝:Tube |
| MAX3292CSD+T | 功能描述:RS-422/RS-485 接口 IC For Long-Distance Communication RoHS:否 制造商:Maxim Integrated 數(shù)據(jù)速率:1136 Kbps 工作電源電壓:3 V to 5.5 V 電源電流:5.9 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-28 封裝:Tube |
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