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參數(shù)資料
| 型號(hào)： | MAX1490B |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Complete, Isolated RS-485/RS-422 Data Interface(2.5Mbps，全雙工，完全隔離的RS-485/422收發(fā)器) |
| 中文描述： | 完備的隔離型、RS-485/RS-422數(shù)據(jù)接口 |
| 文件頁(yè)數(shù)： | 15/20頁(yè) |
| 文件大?。?/td> | 315K |
| 代理商： | MAX1490B |
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M
Complete, Isolated,
RS -485/RS -422 Data Interfac e
______________________________________________________________________________________
15
MAX 1480B/MAX 1490B:
Reduc ed EMI and Reflec tions
The MAX1480B/MAX1490B are slew-rate-limited, mini-
mizing EMI and reducing reflections caused by improp-
erly terminated cables. Figure 11 shows both the driver
output waveform of a MAX1480A/MAX1490A transmit-
ting a 150kHz signal and the Fourier analysis of that
waveform. High-frequency harmonics with large ampli-
tudes are evident. Figure 12 shows the same informa-
tion for the slew-rate-limited MAX1480B/MAX1490B
transmitting the same signal. The high-frequency har-
monics have much lower amplitudes, and therefore the
potential for EMI is significantly reduced.
Table 3. Transmitting
Table 4. Receiving
Table 5. Transmitting
Table 6. Receiving
1
0
X
INPUTS*
1
0
High-Z
OUTPUTS
0
1
High-Z
1
1
0
Figure 11. Driver Output Waveform and FFT Plot of
MAX1480A/MAX1490A Transmitting a 150kHz Signal
10dB/div
0Hz
5MHz
500kHz/div
Figure 12. Driver Output Waveform and FFT Plot of
MAX1480B/MAX1490B Transmitting a 150kHz Signal
10dB/div
0Hz
5MHz
500kHz/div
____________________Func tion Tables
Half-Duplex Devic es
(MAX 1480A/MAX 1480B)
Full-Duplex Devic es
(MAX 1490A/MAX 1490B)
DI
′
A
B
DE
′
≥
+0.2V
≤
-0.2V
Open
INPUTS*
0
1
0
V
A
- V
B
OUTPUT
(RO)
DE
′
0
0
0
0
1
1
0
Z
Y
0
1
1
0
1
OUTPUT
(RO)
≤
-0.2V
Open
≥
+0.2V
INPUT
*
(V
A
- V
B
)
X = Don’t care
High-Z = High impedance
* For DE
′
and DI
′
pin descriptions, see Detailed Block Diagram
and Typical Application Circuit (Figure 1 for MAX1480A/B,
Figure 2 for MAX1490A/B).
OUTPUTS
INPUT
(DI
′
)
*
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| MAX1490BCPG | 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 |
| MAX1490BCPG+ | 功能描述:RS-422/RS-485 接口 IC Isolated RS-485/422 Data Interface 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 |
| MAX1490BEPG | 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 |
| MAX1490BEPG+ | 功能描述:RS-422/RS-485 接口 IC Isolated RS-485/422 Data Interface 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 |
| MAX1490EACPCS | 制造商:Maxim Integrated Products 功能描述: |
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