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| 型号： | ADM1181AARW |
| 厂商： | Analog Devices Inc |
| 文件页数： | 13/16页 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS-232 5V 15KV 16SOIC |
| 标准包装： | 47 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 2/2 |
| 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： | 16-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 16-SOIC W |
| 包装： | 管件 |
ADM202E/ADM1181A
Rev. C | Page 6 of 16
GENERAL DESCRIPTION
The ADM202E/ADM1181E are rugged RS-232 line
drivers/receivers. Step-up voltage converters coupled with level-
shifting transmitters and receivers allow RS-232 levels to be
developed while operating from a single 5 V supply.
Features include low power consumption, high transmission
rates, and compliance with the EU directive on electromagnetic
compatibility. EM compatibility includes protection against
radiated and conducted interference, including high levels of
electrostatic discharge.
All inputs and outputs contain protection against electrostatic
discharges of up to ±15 kV and electrical fast transients of up
to ±2 kV. This ensures compliance to IEC1000-4-2 and
IEC1000-4-4 requirements.
The devices are ideally suited for operation in electrically harsh
environments or where RS-232 cables are frequently being
plugged/unplugged. They are also immune to high RF field
strengths without special shielding precautions.
CMOS technology is used to minimize the power dissipation,
allowing maximum battery life in portable applications.
The ADM202E/ADM1181A serve as a modification,
enhancement, and improvement to the ADM230–ADM241
family and its derivatives. It is essentially plug-in compatible
and do not have materially different applications.
CIRCUIT DESCRIPTION
The internal circuitry consists of four main sections:
A charge-pump voltage converter
5 V logic to EIA-232 transmitters
EIA-232 to 5 V logic receivers.
Transient protection circuit on all I/O lines
Charge-Pump DC-to-DC Voltage Converter
The charge-pump voltage converter consists of a 200 kHz
oscillator and a switching matrix. The converter generates a
±10 V supply from the input 5 V level. This is done in two stages,
using a switched capacitor technique, as illustrated in Figure 6
and Figure 7. First, the 5 V input supply is doubled to 10 V, using
Capacitor C1 as the charge storage element. The 10 V level is
then inverted to generate 10 V, using C2 as the storage element.
Capacitor C3 and Capacitor C4 are used to reduce the output
ripple. Their values are not critical and can be increased if
desired. On the ADM202E, Capacitor C3 is shown connected
between V+ and VCC, whereas it is connected between V+ and
GND on the ADM1181A. It is acceptable to use either
configuration with both the ADM202E and ADM1181A. If
desired, larger capacitors (up to 47 F) can be used for
Capacitor C1 to Capacitor C4. This facilitates direct substitution
with older generation charge-pump RS-232 transceivers.
S1
S2
C1
S4
S3
C3
V+ = 2VCC
VCC
GND
INTERNAL
OSCILLATOR
NOTE: C3 CONNECTS BETWEEN V+ AND GND ON THE ADM1181A
00066-006
Figure 6. Charge-Pump Voltage Doubler
S1
S2
C2
S4
S3
C4
V– = –(V+)
V+
GND
INTERNAL
OSCILLATOR
GND
FROM
VOLTAGE
DOUBLER
00066-
007
Figure 7. Charge-Pump Voltage Inverter
Transmitter (Driver) Section
The drivers convert 5 V logic input levels into RS-232 output
levels. When driving an RS-232 load with VCC = 5 V, the output
voltage swing is typically ±9 V.
Receiver Section
The receivers are inverting level shifters that accept RS-232
input levels and translate them into 5 V logic output levels. The
inputs have internal 5 k pull-down resistors to ground and are
also protected against overvoltages of up to ±30 V. Unconnected
inputs are pulled to 0 V by the internal 5 k pull-down resistor.
Therefore, unconnected inputs and those connected to GND
have a Logic 1 output level.
The receivers have Schmitt-trigger inputs with a hysteresis level
of 0.65 V. This ensures error-free reception for both noisy
inputs and inputs with slow transition times.
HIGH BAUD RATE
The ADM202E/ADM1181A feature high slew rates, permitting
data transmission at rates well in excess of the EIA/RS-232-E
specifications. RS-232 voltage levels are maintained at data rates
of up to 230 kbps, even under worst case loading conditions.
This allows for high speed data links between two terminals and
is also suitable for the new generation ISDN modem standards,
which require data rates of 230 kbps. The slew rate is internally
controlled to less than 30 V/s to minimize EMI interference.
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| ADM1181AARW-REEL | 制造商:Analog Devices 功能描述:Dual Transmitter/Receiver RS-232 16-Pin SOIC W T/R |
| ADM1181AARWZ | 功能描述:IC TXRX RS-232 5V 15KV 16SOIC RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 产品培训模块:RS-232 & USB Transceiver 标准包装:2,000 系列:- 类型:收发器 驱动器/接收器数:1/1 规程:RS232 电源电压:3 V ~ 5.5 V 安装类型:表面贴装 封装/外壳:16-SSOP（0.209"，5.30mm 宽） 供应商设备封装:16-SSOP 包装:带卷 (TR) 其它名称:296-19849-2 |
| ADM1181AARWZ-REEL | 功能描述:IC TXRX RS-232 5V 15KV 16SOIC 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 |
| ADM1184 | 制造商:AD 制造商全称:Analog Devices 功能描述:0.8% Accurate Quad Voltage Monitor |
| ADM1184ARMZ | 功能描述:IC VOLT MONITOR/SEQ 4CH 10MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 其它有关文件:STM6905 View All Specifications 标准包装:1 系列:- 类型:多压监控器 监视电压数目:5 输出:开路漏极或开路集电极 复位:低有效 复位超时:最小为 140 ms 电压 - 阀值:2.188V，2.955V，可调，可调，可调 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-TSSOP 包装:Digi-Reel® 产品目录页面:1197 (CN2011-ZH PDF) 其它名称:497-8728-6 |
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