ADM232AARW-REEL 데이터 시트보기 (PDF) - Analog Devices

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ADM232AARW-REEL

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

Analog Devices 

ADM222/ADM232A/ADM242

VIN

SHDN

3k⍀

VOUT

50pF

Figure 5. Shutdown Test Circuit

3V

SHDN

INPUT

0V

tDT

V+

TRANSMITTER

OUTPUT

V–

+ 5V

– 5V

Figure 6. Transmitter Shutdown Disable Timing

C1

0.1␮F

C2

0.1␮F

5V INPUT

C5

0.1␮F

6.3V

17

2 C1+

VCC

4

+5V TO +10V

VOLTAGE DOUBLER

V+

3

C1–

5

C2+ +5V TO –10V

VOLTAGE INVERTER V–

7

6

C2–

C3

0.1␮F

C4

0.1␮F

12

T1IN

TTL/CMOS

INPUTS*

11

T2IN

TTL/CMOS

OUTPUTS

13

R1OUT

10

R2OUT

T1

T2

R1

R2

15

T1OUT

RS-232

8

OUTPUTS

T2OUT

14

R1IN

RS-232

9

INPUTS**

R2IN

ADM222

GND

18 SHDN

16 * INTERNAL 400k⍀ PULL-UP RESISTOR

ON EACH TTL/CMOS INPUT

** INTERNAL 5k⍀ PULL-DOWN RESISTOR

ON EACH RS-232 INPUT

Figure 7. ADM222 Typical Operating Circuit

PIN FUNCTION DESCRIPTION

Mnemonic

VCC

V+

V–

GND

C1+

C1–

C2+

C2–

TIN

TOUT

RIN

ROUT

NC

EN

SHDN

Function

Power Supply Input, 5 V ± 10%.

Internally generated positive supply (+10 V

nominal).

Internally generated negative supply (–10 V

nominal).

Ground Pin. Must be connected to 0 V.

External capacitor 1, (+ terminal) is connected

to this pin.

External capacitor 1, (– terminal) is connected

to this pin.

External capacitor 2, (+ terminal) is connected

to this pin.

External capacitor 2, (– terminal) is connected

to this pin.

Transmitter (Driver) Inputs. These inputs accept

TTL/CMOS levels. An internal 400 kΩ pull-up

resistor to VCC is connected on each input.

Transmitter (Driver) Outputs. These are RS-232

levels (typically ± 9 V).

Receiver Inputs. These inputs accept RS-232

signal levels. An internal 5 kΩ pull-down resistor

to GND is connected on each of these inputs.

Receiver Outputs. These are TTL/CMOS levels.

No Connect. No connections are required to

this pin.

(ADM242 Only) Active Low Digital Input. May

be used to enable or disable (three-state) both

receiver outputs.

(ADM222 and ADM242) Active Low Digital

Input. May be used to disable the device so that

the power consumption is minimized. On the

ADM222 all drivers and receivers are disabled.

On the ADM242 the drivers are disabled but the

receivers remain enabled.

NC 1

18 SHDN

C1+ 2

V+ 3

17 VCC

16 GND

C1– 4 ADM222 15 T1OUT

C2+ 5 TOP VIEW 14 R1IN

(Not to Scale)

C2– 6

13 R1OUT

V– 7

12 T1IN

T2OUT 8

11 T2IN

R2IN 9

10 R2OUT

NC = NO CONNECT

Figure 8. ADM222 DIP and SOIC Pin Configurations

–4–

REV. B

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