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参数资料
| 型号： | ADM101EARM-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 12/12页 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS-232 SINGLE 5V 10MSOP |
| 标准包装： | 1,000 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 1/1 |
| 规程： | RS232 |
| 电源电压： | 4.5 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-MSOP |
| 包装： | 带卷 (TR) |
Data Sheet
ADM101E
CIRCUIT DESCRIPTION
The internal circuitry consists of three main sections. These are:
1. A charge pump dc-to-dc converter.
2. 5 V logic to EIA-232 driver.
3. EIA-232 to 5 V logic receiver.
CHARGE PUMP DC-DC CONVERTER
The dc-dc converter generates a negative supply voltage from
the 5 V supply, thus removing the need for a separate 5 V rail.
It consists of an on-chip 200 kHz oscillator, switching matrix
and two external capacitors, as shown in Figure 9.
Figure 9. Charge Pump DC–DC Converter
When S1 and S2 are closed, S3 and S4 are open, and C1 charges
to +VCC. S1 and S2 are then opened, while S3 and S4 are closed
to connect C1 across C2, dumping charge into C2. Since the
positive terminal of C2 is at ground, a negative voltage will be
built up on its negative terminal with each cycle of the oscilla-
tor. This voltage depends on the current drawn from C2. If the
current is small, the voltage will be close to VCC, but will fall as
the current drawn increases.
CHARGE PUMP CAPACITORS AND SUPPLY
DECOUPLING
For proper operation of the charge pump, the capacitors should
have an equivalent series resistance (ESR) less than 1 Ω. As the
charge pump draws current pulses from VCC, the VCC decoupling
capacitor should also have low ESR. The VCC decoupling capacitor
and V– reservoir capacitor should also have low ESR because
they determine how effectively ESD pulses are clamped to VCC
or V by the on-chip clamp diodes. Tantalum or monolithic
ceramic capacitors are suitable for these components. If using
tantalum capacitors, do not forget to observe polarity.
TRANSMITTER (DRIVER) SECTION
The driver converts 5 V logic input levels into RS-232 compatible
output levels. With VCC = 5 V and driving an EIA-232 load, the
output voltage swing is typically ±4.2 V.
RECEIVER SECTION
The receivers are inverting level-shifters that accept EIA-232
input levels and translate them into 5 V logic output levels. The
inputs have internal 5 kΩ pull-down resistors to ground and are
also protected against overvoltages of up to ±25 V. The guaranteed
switching thresholds are 0.8 V minimum and 2.8 V maximum.
An unconnected receiver input is pulled to 0 V by the internal
5 kΩ pull-down resistor. This, therefore, results in a Logic 1 output
level for unconnected inputs or for inputs connected to GND.
The receivers have Schmitt trigger input with a hysteresis level
of 0.25 V. This ensures error-free reception for both noisy
inputs and for inputs with slow transition times.
Rev. B | Page 9 of 12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADM101EARMZ | 功能描述:IC TX/RX RS-232 SINGLE 5V 10MSOP RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:121 系列:- 类型:收发器 驱动器/接收器数:1/1 规程:RS422，RS485 电源电压:3 V ~ 3.6 V 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-DFN（3x3） 包装:管件 |
| ADM101EARMZ | 制造商:Analog Devices 功能描述:RS-232 IC |
| ADM101EARMZ-REEL | 功能描述:IC TXRX RS-232 SINGLE 5V 10MSOP RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:121 系列:- 类型:收发器 驱动器/接收器数:1/1 规程:RS422，RS485 电源电压:3 V ~ 3.6 V 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-DFN（3x3） 包装:管件 |
| ADM101EARMZ-REEL7 | 功能描述:IC TXRX RS-232 SINGLE 5V 10MSOP RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:121 系列:- 类型:收发器 驱动器/接收器数:1/1 规程:RS422，RS485 电源电压:3 V ~ 3.6 V 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-DFN（3x3） 包装:管件 |
| ADM101EWARMZ-REEL7 | 功能描述:IC TXRX RS-232 SINGLE 5V 10MSOP RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:121 系列:- 类型:收发器 驱动器/接收器数:1/1 规程:RS422，RS485 电源电压:3 V ~ 3.6 V 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-DFN（3x3） 包装:管件 |
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