參數(shù)資料
型號: MAX1480B
廠商: Maxim Integrated Products, Inc.
英文描述: Complete, Isolated RS-485/RS-422 Data Interface(半雙工,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
文件頁數(shù): 15/20頁
文件大小: 315K
代理商: MAX1480B
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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