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参数资料
型号： MAX1490EBCPG+
厂商： Maxim Integrated Products
文件页数： 3/19页
文件大小： 0K
描述： IC RS485/RS422 DATA INTRFC 24DIP
产品培训模块： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装： 16
类型： 收发器
驱动器/接收器数： 1/1
规程： RS422，RS485
电源电压： 4.5 V ~ 5.5 V
安装类型： 通孔
封装/外壳： 24-DIP（0.600"，15.24mm）
供应商设备封装： 24-PDIP
包装： 管件
产品目录页面： 1403 (CN2011-ZH PDF)
MAX1480E/MAX1490E
±15kV ESD-Protected, Isolated RS-485/RS-422
Data Interfaces
______________________________________________________________________________________
11
MAX1480EC/MAX1490EB:
Reduced EMI and Reflections
The MAX1480EC/MAX1490EB are slew-rate-limited,
minimizing EMI and reducing reflections caused by
improperly terminated cables. Figure 11 shows both
the driver output waveform of a MAX1480EA/
MAX1490EA transmitting a 150kHz signal and the
Fourier analysis of that waveform. High-frequency har-
monics with large amplitudes are evident. Figure 12
shows the same information for the slew-rate-limited
MAX1480EC/MAX1490EB transmitting the same signal.
The high-frequency harmonics have much lower ampli-
tudes, and therefore the potential for EMI is significantly
reduced.
Driver Output Protection
There are two mechanisms to prevent excessive output
current and power dissipation caused by faults or by
bus contention. A foldback current limit on the output
stage provides immediate protection against short cir-
SHIELD (OPTIONAL)
EXTERNAL RS-485/RS-422 WIRING
A
RL
B
Z
Y
RL
R3*
R4*
R5, 100
SH1
SH2
R1*
R2*
R6, 100
DI
VIN
+5V
C1
22
F
C2
0.1
F
LOGIC GROUND
ISOLATION BARRIER
ISOLATED COMMON
DRIVER INPUT
RECEIVER OUTPUT
DI
RO
74HC86
OR EQUIVALENT
MAX845
N
MAX1490EA: MAX490E
MAX1490EB: MAX488E
ISO DI DRV
ISO RO DRV
A
B
Z
Y
D
R
N
Q
T F/F
VCC3
FS
OSC
1.07MHz/
1.45MHz
SD
GND1
D2
D1
SHIELD (OPTIONAL)
NOTE: RESISTORS R5 AND R6 PROTECT
THE MAX1490EA/MAX1490EB FROM
TRANSIENT CURRENTS BETWEEN SHIELD AND
TRANSMISSION LINES.
TWISTED PAIR
TO OTHER TRANSCEIVERS
TERMINATING RESISTOR
(ONE RESISTOR ON EACH END)
TWISTED PAIR
TO OTHER TRANSCEIVERS
24
23
22
21
20
19
18
17
1
2
3
4
5
6
7
8
AC1 (MAKE NO CONNECTION)
AC2 (MAKE NO CONNECTION)
ISO VCC1
ISO RO DRV
D2
D1
VCC2
VCC1
A
B
Z
Y
VCC3
SD
FS
GND1
16
15
14
13
9
10
11
12
ISO COM1
ISO DI DRV
ISO VCC2
ISO RO LED
GND2
R0
VCC4
DI
MAX845
MAX488E MAX490E
MAX1490EA/
MAX1490EB
*SEE TABLE 2.
270 pF
4kV
Figure 2. MAX1490EA/MAX1490EB Detailed Block Diagram and Typical Application Circuit
Table 2. Pullup and LED Drive Resistors for Figure 2
MAX1490EB
200
3000
330
3000
1000
330
1000
200
MAX1490EA
R4 (
)
R3 (
)
R2 (
)
R1 (
)
PART
相关PDF资料
PDF描述
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相关代理商/技术参数
参数描述
MAX1490EBCPG+ 功能描述:RS-422/RS-485 接口 IC Isolated RS-485/422 Data Interface RoHS:否 制造商:Maxim Integrated 数据速率:1136 Kbps 工作电源电压:3 V to 5.5 V 电源电流:5.9 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-28 封装:Tube
MAX1490EBEPG 功能描述:RS-422/RS-485 接口 IC RoHS:否 制造商:Maxim Integrated 数据速率:1136 Kbps 工作电源电压:3 V to 5.5 V 电源电流:5.9 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-28 封装:Tube
MAX1490EBEPG+ 功能描述:RS-422/RS-485 接口 IC Isolated RS-485/422 Data Interface RoHS:否 制造商:Maxim Integrated 数据速率:1136 Kbps 工作电源电压:3 V to 5.5 V 电源电流:5.9 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-28 封装:Tube
MAX1491CAI 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32
MAX1491CAI+ 功能描述:模数转换器 - ADC 3.5 Digit ADC w/LCD Drivers RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32
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