ADM208ARSZ Просмотр технического описания (PDF) - Analog Devices

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Компоненты Описание

производитель

ADM208ARSZ

0.1 μF, 5 V Powered CMOS RS-232 Drivers/Receivers

Analog Devices 

ADM206/ADM207/ADM208/ADM211/ADM213

Table 4. Pin Function Descriptions

Mnemonic Function

VCC

Power Supply Input. 5 V ± 10%.

V+

Internally Generated Positive Supply (10 V nominal).

V–

Internally Generated Negative Supply (–10 V Nominal).

GND

Ground Pin. Must be connected to 0 V.

C1+

External Capacitor (+ terminal) is connected to this pin.

C1–

External Capacitor (– terminal) is connected to this pin.

C2+

External Capacitor (+ terminal) is connected to this pin.

C2–

External Capacitor (– terminal) is connected to this pin.

TIN

Transmitter (Driver) Inputs. These inputs accept TTL/CMOS levels. An internal 400 kΩ pull-up resistor to VCC is connected to

each input.

TOUT

Transmitter (Driver) Outputs. These are RS-232 levels (typically ± 10 V).

RIN

Receiver Inputs. These inputs accept RS-232 signal levels. An internal 5 kΩ pull-down resistor to GND is connected to each

input.

ROUT

Receiver Outputs. These are TTL/CMOS levels.

EN/EN

Enable Input. Active low on ADM206 and ADM211. Active high on ADM213. This input is used to enable/disable the receiver

outputs. With EN = low (EN = high ADM213), the receiver outputs are enabled. With EN = high (EN = low ADM213), the

outputs are placed in a high impedance state. This is useful for connecting to microprocessor systems.

SD/SD

Shutdown Input. Active high on ADM206 and ADM211. Active low on ADM213. With SD = high on the ADM206 and ADM211,

the charge pump is disabled, the receiver outputs are placed in a high impedance state, and the driver outputs are turned off.

With SD = low on the ADM213, the charge pump is disabled, the driver outputs are turned off, and all receivers, except R4 and

R5, are placed in a high impedance state. In shutdown, the power consumption reduces to 5 μW.

NC

No Connect. No connections are required to this pin.

Table 5. ADM206 and ADM211 Truth Table

SD

EN

Status

Transmitters T1–T5

0

0

Normal Operation

Enabled

0

1

Normal Operation

Enabled

1

0

Shutdown

Disabled

Receivers R1–R5

Enabled

Disabled

Disabled

Table 6. ADM213 Truth Table

SD

EN

Status

0

0

Shutdown

0

1

Shutdown

1

0

Normal Operation

1

1

Normal Operation

Transmitters T1–T4

Disabled

Disabled

Enabled

Enabled

Receivers R1–R3

Disabled

Disabled

Disabled

Enabled

Receivers R4, R5

Disabled

Enabled

Disabled

Enabled

Rev. D | Page 8 of 16

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