參數(shù)資料
型號(hào): MAX1480CCPI
廠商: Maxim Integrated Products
文件頁數(shù): 8/21頁
文件大?。?/td> 0K
描述: IC DATA INTRFACE RS485/422 28DIP
產(chǎn)品培訓(xùn)模塊: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝: 14
類型: 收發(fā)器
驅(qū)動(dòng)器/接收器數(shù): 1/1
規(guī)程: RS422,RS485
電源電壓: 4.5 V ~ 5.5 V
安裝類型: 通孔
封裝/外殼: 28-DIP(0.600",15.24mm)
供應(yīng)商設(shè)備封裝: 28-PDIP
包裝: 管件
MAX1480A/B/C,
MAX1490A/B
Complete, Isolated RS-485/RS-422
Data Interface
16
______________________________________________________________________________________
MAX1480B/MAX1480C/MAX1490B:
Reduced EMI and Reflections
The MAX1480B/MAX1480C/MAX1490B are slew-rate-
limited, minimizing EMI and reducing reflections
caused by improperly terminated cables. Figure 11
shows both the driver output waveform of a
MAX1480A/MAX1490A transmitting a 150kHz signal
and the Fourier analysis of that waveform. High-fre-
quency harmonics with large amplitudes are evident.
Figure 12 shows the same information for the slew-rate-
limited MAX1480B/MAX1480C/MAX1490B transmitting
the same signal. The high-frequency harmonics 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
X
INPUTS*
1
High-Z
OUTPUTS
0
High-Z
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/MAX1480C/MAX1490B Transmitting a 150kHz
Signal
10dB/div
0Hz
5MHz
500kHz/div
_____________________Function Tables
Half-Duplex Devices
(MAX1480A/MAX1480B/MAX1480C)
Full-Duplex Devices
(MAX1490A/MAX1490B)
DI
A
B
DE
0
1
≥ +0.2V
Open
INPUTS*
0
VA - VB
OUTPUT
(RO)
DE
≤ -0.2V
1
0
1
Z
Y
1
0
1
OUTPUT
(RO)
0
≤ -0.2V
≥ +0.2V
Open
INPUT
(VA - VB)
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/C,
Figure 2 for MAX1490A/B).
OUTPUTS
INPUT
*
(DI
)
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