Datasheet > ADM205

ADM205

更新时间： 2024-01-14 00:12:39

品牌	Logo	应用领域
亚德诺 - ADI		驱动器
页数	文件大小	规格书
12页	488K
描述
0.1 uF, +5 V Powered CMOS RS-232 Drivers/Receivers

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ADM205 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
零件包装代码：	DIP	包装说明：	DIP, DIP24,.6
针数：	24	Reach Compliance Code：	not_compliant
ECCN代码：	EAR99	HTS代码：	8542.39.00.01
风险等级：	5.56	其他特性：	INTERNAL CHARGE PUMP; TRISTATABLE RECEIVERS
差分输出：	NO	驱动器位数：	5
输入特性：	SCHMITT TRIGGER	接口集成电路类型：	LINE TRANSCEIVER
接口标准：	EIA-232-E; V.28	JESD-30 代码：	R-PDIP-T24
JESD-609代码：	e0	长度：	31.625 mm
功能数量：	5	端子数量：	24
最高工作温度：	85 °C	最低工作温度：	-40 °C
最小输出摆幅：	10 V	输出特性：	3-STATE
最大输出低电流：	0.0016 A	输出极性：	INVERTED
封装主体材料：	PLASTIC/EPOXY	封装代码：	DIP
封装等效代码：	DIP24,.6	封装形状：	RECTANGULAR
封装形式：	IN-LINE	峰值回流温度（摄氏度）：	NOT SPECIFIED
电源：	5 V	认证状态：	Not Qualified
最大接收延迟：	5000 ns	接收器位数：	5
座面最大高度：	5.08 mm	子类别：	Line Driver or Receivers
最大压摆率：	9 mA	最大供电电压：	5.5 V
最小供电电压：	4.5 V	标称供电电压：	5 V
表面贴装：	NO	技术：	CMOS
温度等级：	INDUSTRIAL	端子面层：	Tin/Lead (Sn85Pb15)
端子形式：	THROUGH-HOLE	端子节距：	2.54 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	NOT SPECIFIED
宽度：	15.24 mm	Base Number Matches：	1

ADM205 数据手册

ADM205–ADM211/ADM213

Transmitter (Driver) Section

Enable Input

The drivers convert TTL/CMOS input levels into EIA-232-E

output levels. With V_CC= +5 V and driving a typical EIA-232-E

load, the output voltage swing is ±9 V. Even under worst case

conditions the drivers are guaranteed to meet the±5 V EIA-232-E

minimum requirement.

The ADM205, ADM209, ADM211, and ADM213 feature an

enable input used to enable or disable the receiver outputs. The

enable input is active low on the ADM205, ADM209, ADM211

and active-high on the ADM213. Refer to Tables II and III.

When disabled, all receiver outputs are placed in a high imped-

ance state. This function allows the outputs to be connected di-

rectly to a microprocessor data bus. It can also be used to allow

receivers from different devices to share a common data line.

The timing diagram for the enable function is shown in Figure

25.

The input threshold levels are both TTL and CMOS compat-

ible with the switching threshold set at V_CC/4. With a nominal

_CC= 5 V the switching threshold is 1.25 V typical. Unused in-

puts may be left unconnected, as an internal 400 kΩ pull-up re-

sistor pulls them high forcing the outputs into a low state.

As required by the EIA-232-E standard, the slew rate is limited

to less than 30 V/µs without the need for an external slew limit-

ing capacitor and the output impedance in the power-off state is

greater than 300 Ω.

DIS

Receiver Section

The receivers are inverting level shifters which acceptEIA-232-E

input levels (±5 V to ±15 V) and translate them into 5 V TTL/

CMOS levels. The inputs have internal 5 kΩ pull-down resistors

to ground and are also protected against overvoltages of up to

±30 V. The guaranteed switching thresholds are 0.8 V mini-

mum and 2.4 V maximum which are well within the ±3 V

EIA-232-E requirement. The low level threshold is deliberately

positive as it ensures that an unconnected input will be inter-

preted as a low level.

3.5V

0.8V

– 0.1V

+ 0.1V

OUT

VOL

* POLARITY OF EN IS REVERSED FOR ADM213

Figure 25. Enable Timing

APPLICATION HINTS

Driving Long Cables

In accordance with the EIA-232-E standard, long cables are

permissible provided that the total load capacitance does not ex-

ceed 2500 pF. For longer cables which do exceed this, then it is

possible to trade off baud rate vs. cable length. Large load ca-

pacitances cause a reduction in slew rate, and hence the maximum

transmission baud rate is decreased. The ADM205–ADM211 and

ADM213 are designed so that the slew rate reduction with in-

creasing load capacitance is minimized.

The receivers have Schmitt trigger inputs with a hysteresis level

of 0.5 V. This ensures error-free reception for both noisy inputs

and for inputs with slow transition times.

Shutdown (SD)

The ADM205, ADM206, ADM211 and ADM213 feature a

control input which may be used to disable the part and reduce

the power consumption to less than 5 µW. This is very useful in

battery operated systems. During shutdown the charge pump is

turned off, the transmitters are disabled and all receivers except

R4 and R5 on the ADM213 are put into a high-impedance dis-

abled state. Receivers R4 and R5 on the ADM213 remain en-

abled during shutdown. This feature allows monitoring external

activity such as ring indicator monitoring while the device is in a

low power shutdown mode. The shutdown control input is ac-

tive high on all parts except the ADM213 where it is active low.

Refer to Tables II and III.

For the receivers, it is important that a high level of noise immu-

nity be inbuilt so that slow rise and fall times do not cause mul-

tiple output transitions as the signal passes slowly through the

transition region. The ADM205–ADM211 and ADM213 have

0.5 V of hysteresis to guard against this. This ensures that, even

in noisy environments, error-free reception can be achieved.

High Baud Rate Operation

The ADM205–ADM211 and ADM213 feature high slew rates

permitting data transmission at rates well in excess of the

EIA-232-E specification. The drivers maintain ±5 V signal

levels at data rates up to 120-kB/s under worst-case loading

conditions.

–10–

REV. 0

1...7 8 91011 12

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型号	品牌	描述	获取价格	数据表
ADM205-ADM211	ADI	0.1 mF. +5 V Powered CMOS RS-232 Drivers/Receivers	获取价格
ADM205AN	ADI	0.1 uF, +5 V Powered CMOS RS-232 Drivers/Receivers	获取价格
ADM206	ADI	0.1 uF, +5 V Powered CMOS RS-232 Drivers/Receivers	获取价格
ADM206AN	ADI	0.1 uF, +5 V Powered CMOS RS-232 Drivers/Receivers	获取价格
ADM206ANZ	ADI	0.1 Î¼F, 5 V Powered CMOS RS-232 Drivers/Rece	获取价格
ADM206AR	ADI	0.1 uF, +5 V Powered CMOS RS-232 Drivers/Receivers	获取价格

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