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參數(shù)資料
| 型號： | ADM2483BRW |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 9/20頁 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS-485 ISOLATED 16-SOIC |
| 標準包裝： | 47 |
| 系列： | iCoupler® |
| 類型： | 收發(fā)器，隔離式 |
| 驅動器/接收器數(shù)： | 1/1 |
| 規(guī)程： | RS422/RS485 |
| 電源電壓： | 3.3V，5V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SOIC（0.295"，7.50mm 寬） |
| 供應商設備封裝： | 16-SOIC |
| 包裝： | 管件 |
Data Sheet
ADM2483
Rev. C | Page 17 of 20
APPLICATIONS INFORMATION
POWER_VALID INPUT
To avoid chatter on the A and B outputs caused by slow power-
up and power-down transients on VDD1 (>100 μs/V), the
ADM2483 features a power_valid (PV) digital input. This pin
should be driven low until VDD1 exceeds 2.0 V. When VDD1 is
greater than 2.0 V, the pin should be driven high. Conversely,
upon power-down, the PV should be driven low before VDD1
reaches 2.0 V.
The power_valid input can be driven, for example, by the
output of a system reset circuit such as the ADM809Z, which
has a threshold voltage of 2.32 V.
04736-029
VDD1
2.32V
tPOR
2.0V
2.32V
2.0V
RESET
ADM809Z
ADM2483
VDD1
PV
GND1
VDD1
Figure 29. Driving PV with ADM809Z
ISOLATED POWER SUPPLY CIRCUIT
The ADM2483 requires isolated power capable of 5 V at
100 mA to be supplied between the VDD2 and GND2 pins. If no
suitable integrated power supply is available, a discrete circuit,
such as the one in Figure 30, can be used. A center-tapped
transformer provides electrical isolation. The primary winding
is excited with a pair of square waveforms that are 180° out of
phase with each other. A pair of Schottky diodes and a
smoothing capacitor are used to create a rectified signal from
the secondary winding. The ADP667 linear voltage regulator
provides a regulated power supply to the ADM2483’s bus-side
circuitry.
To create the pair of square waves, a D-type flip-flop with
complementary Q/Q outputs is used. The flip-flop can be
connected so that output Q follows the clock input signal. If no
local clock signal is available, a simple digital oscillator can be
implemented with a hex-inverting Schmitt trigger and a resistor
and capacitor. In this case, values of 3.9 kΩ and 1 nF generate a
364 kHz square wave. A pair of discrete NMOS transistors,
switched by the Q/Q flip-flop outputs, conduct current through
the center tap of the primary transformer, winding in an
alternating fashion.
04736-030
3.9k
100nF
1nF
74HC14
VCC
74HC74A
PR
CLR
DQ
CLK
Q
BS107A
VCC
ISOLATION
BARRIER
SD103C
22
F
SD103C
78253
100nF
VCC
IN
OUT
5V
SET
SHDN
GND
ADP667
VDD1
VDD2
GND1
GND2
ADM2483
VCC
Figure 30. Isolated Power Supply Circuit
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ADM2483BRW-REEL | 功能描述:IC TXRX RS-485 ISOLATED 16SOIC RoHS:否 類別:集成電路 (IC) >> 接口 - 驅動器，接收器，收發(fā)器 系列:iCoupler® 標準包裝:27 系列:- 類型:收發(fā)器 驅動器/接收器數(shù):3/3 規(guī)程:RS232，RS485 電源電壓:4.75 V ~ 5.25 V 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:28-SOIC 包裝:管件 |
| ADM2483BRWZ | 功能描述:IC TXRX RS485 ISOLATED 16SOIC RoHS:是 類別:集成電路 (IC) >> 接口 - 驅動器，接收器，收發(fā)器 系列:iCoupler® 標準包裝:27 系列:- 類型:收發(fā)器 驅動器/接收器數(shù):3/3 規(guī)程:RS232，RS485 電源電壓:4.75 V ~ 5.25 V 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:28-SOIC 包裝:管件 |
| ADM2483BRWZ | 制造商:Analog Devices 功能描述:RS-485 IC |
| ADM2483BRWZ-REEL | 功能描述:IC TXRX RS-485 ISOLATED 16SOIC RoHS:是 類別:集成電路 (IC) >> 接口 - 驅動器，接收器，收發(fā)器 系列:iCoupler® 標準包裝:27 系列:- 類型:收發(fā)器 驅動器/接收器數(shù):3/3 規(guī)程:RS232，RS485 電源電壓:4.75 V ~ 5.25 V 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:28-SOIC 包裝:管件 |
| ADM2484E | 制造商:AD 制造商全稱:Analog Devices 功能描述:500 kbps, ESD Protected, Half-/Full-Duplex, iCoupler, Isolated RS-485 Transceiver |
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