ADM101E [ADI]

Craft PortTM Tiny RS-232 Transceiver for Portable Applications; 工艺Port™插孔微型RS - 232收发器，用于便携式应用


型号：	ADM101E
厂家：	ADI
描述：	Craft PortTM Tiny RS-232 Transceiver for Portable Applications 工艺Port™插孔微型RS - 232收发器，用于便携式应用便携式
文件：	总6页 (文件大小：68K)
中文：	中文翻译
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Craft Port^TMTiny RS-232 Transceiver for

Portable Applications

ADM101E

FUNCTIONAL BLOCK DIAGRAM

FEATURES

460 kbit/s Transmission Rate

Single +5 V Power Supply

0.1␮F

Compatible with RS-232 Input/Output Levels

0.1 ␮F Charge Pump Capacitors

One Driver and One Receiver

On-Board DC-DC Converter

؎4.2 V Output Swing with +5 V Supply

Low Power BiCMOS: 500 ␮A I_CC

Ultralow Power (1 ␮A) Shutdown Mode

10-Lead ␮SOIC Package

0.1␮F

GND

C1–

V–

+5V TO –5V

VOLTAGE

INVERTER

+5V

C1+

0.1␮F

ADM101E

OUT

APPLICATIONS

Mobile Telephones

Palmtop Computers

PDAs

Portable Instrumentation

GPS Receivers

GENERAL DESCRIPTION

An epitaxial BiCMOS construction minimizes power consump-

tion to 3 mW and also guards against latch-up. Overvoltage

protection is provided allowing the receiver inputs to withstand

continuous voltages in excess of ±30 V. In addition, all I-O pins

have ESD protection to levels greater than 15 kV.

The ADM101E is a single channel RS-232 driver and receiver in

the Analog Devices Craft Port series, designed to operate from a

single, +5 V supply. A highly efficient charge-pump voltage

inverter generates an on-chip –5 V supply, which eliminates the

need for a negative power supply for the driver and permits

RS-232 compatible output levels to be developed using charge

pump capacitors as small as 0.1 µF.

The ADM101E is available in a 10-lead µSOIC package, which

makes it ideal for serial communications in small, portable ap-

plications such as palmtop computers and mobile telephones,

where a full, RS-232 serial interface is not required, but com-

pact size and low power drain are paramount.

A shutdown input disables the charge pump and puts the device

into a low power shutdown mode, in which the current con-

sumption is typically less than 1 µA. The transmitter is disabled

during shutdown but the receiver remains functional.

Craft Port is a trademark of Analog Devices, Inc.

REV. 0

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700

Fax: 781/326-8703

World Wide Web Site: http://www.analog.com

(V_CC= +5 V ؎ 10%, C1 = C2 = 0.1 ␮F. All specifications T_MINto T_MAXunless

ADM101E–SPECIFICATIONS ^{otherwise noted.)}

Parameter

Min

Typ

Max

Units Test Conditions/Comments

Output Voltage Swing

±3.5

±3.25 ±4.2

±4.2

V_CC= 5 V ±5%, T_OUTLoaded with 3 kΩ to GND

V_CC= 5 V ±10%, T_OUTLoaded with 3 kΩ to

GND

V_CCPower Supply Current (Unloaded)

V_CCPower Supply Current (Loaded)

V_CCPower Supply Current (Shutdown)

Input Logic Threshold Low, V_INL

Input Logic Threshold High, V_INH

Input Leakage Current

RS-232 Input Voltage Range

RS-232 Input Threshold Low

RS-232 Input Threshold High

RS-232 Input Hysteresis

0.5

1.85

2.5

0.8

µA

kΩ

No Load, T_IN= V_CCor GND

T_OUTLoaded with 3 kΩ to GND

SD Input = V_CC

2.4

±1

+15

–15

0.8

2.2

2.4

0.2

2.6

RS-232 Input Resistance

TTL/CMOS Output Voltage Low, V_OL

TTL/CMOS Output Voltage High, V_OH

Propagation Delay

0.4

µs

V/µs

I_OUT= 1.6 mA

I_OUT= –1.0 mA

RS-232 to TTL

C_L= 10 pF, R_L= 3 kΩ–7 kΩ, T_A= +25°C

R_L= 3 kΩ, C_L= 1000 pF

Measured from +3 V to –3 V or Vice Versa

R_L= 3 kΩ, C_L= 1 nF

3.5

0.25

Instantaneous Slew Rate¹

Transition Region Slew Rate

Baud Rate

Output Resistance

460

300

Ω

V_CC= 0 V, V_OUT= ±2 V

RS-232 Output Short Circuit Current

±25

±60

NOTES

¹Sample tested to ensure compliance.

Specifications subject to change without notice.

ABSOLUTE MAXIMUM RATINGS*

(T_A= +25°C unless otherwise noted)

ORDERING GUIDE

Temperature

Range

Package

Description

Package

Option

V_CC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +6 V

V– . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +0.3 V to –6 V

Input Voltages

Model

ADM101EARM

–40°C to +85°C µSOIC

RM-10

Driver Input T_IN. . . . . . . . . . . . . . –0.3 V to (V_CC, +0.3 V)

Receiver Input R_IN. . . . . . . . . . . . . . . . . . . . . . . . . . . ±30 V

Output Voltages

Driver Output T_OUT. . . . . . . .(V_CC, +0.3 V) to (V–, –0.3 V)

Receiver Output R_OUT. . . . . . . . . . . –0.3 V to (V_CC+0.3 V)

Short Circuit Duration

T_OUT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Continuous

Power Dissipation

RM-10 (Derate 12 mW/°C Above +70°C) . . . . . . . 1488 mW

Thermal Impedance . . . . . . . . . . . . . . . . . . . . . . . +135°C/W

Operating Temperature Range

Industrial (A Version) . . . . . . . . . . . . . . . . –40°C to +85°C

Storage Temperature Range . . . . . . . . . . . . –65°C to +150°C

Lead Temperature Soldering

Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . .+215°C

Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . .+220°C

ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . >2000 V

ESD Rating (I-O Pins) . . . . . . . . . . . . . . . . . . . . . . . . . 15 kV

*This is a stress rating only; functional operation of the device at these or any other

conditions above those indicated in the operation sections of this specification is

not implied. Exposure to absolute maximum rating conditions for extended

periods of time may affect reliability.

–2–

REV. 0

ADM101E

PIN FUNCTION DESCRIPTION

PIN CONFIGURATION

No. Mnemonic Function

GND

C1–

V–

C1+

GND

C1–

Ground Pin. Must be connected to 0 V.

ADM101E

TOP VIEW

(Not to Scale)

Negative Terminal of C1 (if C1 is Polarized

Capacitor).

OUT

V–

Internally Generated Negative Supply Voltage.

OUT

T_IN

Driver Input (3 V to 5 V TTL/CMOS

Logic Levels).

R_OUT

Receiver Output (3 V to 5 V TTL/CMOS

Logic Levels).

R_IN

Receiver Input (EIA-232 Signal Levels).

Driver Output (EIA-232 Signal Levels).

T_OUT

Shutdown Input. Logic 1 on this input puts

the ADM101E into low power shutdown mode.

C1+

V_CC

Positive Terminal of Charge Pump Capacitor

(if C1 is Polarized Capacitor).

Positive Power Supply, Nominally +5 V.

Typical Performance Characteristics

–1

–2

–3

–4

–5

–6

500

1000

1500

2000

2500

3000

3500

LOAD CAPACITANCE – pF

CURRENT – mA

Figure 2. I_DDvs. Load Capacitance @ 460 kbps

Figure 1. Charge Pump Voltage vs. Current

REV. 0

–3–

ADM101E

SERIES 1

–10

–20

–30

–40

–1

–2

–3

–4

SERIES 2

400

–5

500

1000

1500

2000

2500

100

200

300

500

600

LOAD CAPACITANCE – pF

DATA RATE – kbps

Figure 3. Transmitter Output Voltage vs. Load Capacitance

@ 460 kbps

Figure 5. Slew Rate vs. Data Rate

–1

–2

–4

–2

–3

–4

–5

–6

– Volts

LOAD CURRENT – mA

Figure 4. Tx Output Voltage vs. Supply

Figure 6. Transmitter Output Voltage vs. Load Current

–4–

REV. 0

ADM101E

GENERAL DESCRIPTION

Charge Pump Capacitors And Supply Decoupling

The ADM101E is an RS-232 compatible line driver/receiver in

the Analog Devices Craft Portseries, containing one driver (trans-

mitter) and one receiver. It is ideal for serial communication in

small portable devices such as mobile telephones, palmtop per-

sonal computers and personal digital assistants, where a full,

RS-232 serial interface is not required, and only Tx and Rx lines

are required for low speed communication between devices. The

ADM101E operates from a single, +5 V supply, and generates

its own, on-chip, –5 V power supply, thus removing the need for

a negative power supply for the driver.

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 V_CC, the V_CCdecou-

pling capacitor should also have low ESR. The V_CCdecoupling

capacitor and V– reservoir capacitor should also have low ESR

because they determine how effectively ESD pulses are clamped

to V_CCor V– by the on-chip clamp diodes. Tantalum or mono-

lithic 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 compat-

ible output levels. With V_CC= +5 V and driving an EIA-232

load, the output voltage swing is typically ±4.2 V.

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.

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 con-

nected to GND.

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 ma-

trix and two external capacitors, as shown in Figure 7.

GND

The receivers have Schmitt trigger input with a hysteresis level

of 0.25 V. This ensures error-free reception for both noisy in-

puts and for inputs with slow transition times.

GND

V– = –V

INTERNAL

OSCILLATOR

SHUTDOWN INPUT

The shutdown input allows the ADM101E to be put into an

ultralow power mode where the dc-dc converter is switched off

and the transmitter is disabled. The receiver remains active

during shutdown. Logic 0 at this input enables the ADM101E,

while a Logic 1 at this input shuts down the ADM101E.

Figure 7. Charge Pump DC–DC Converter

When S1 and S2 are closed, S3 and S4 are open, and C1

charges to +V_CC. 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

oscillator. This voltage depends on the current drawn from C2.

If the current is small, the voltage will be close to –V_CC, but will

fall as the current drawn increases.

REV. 0

–5–

ADM101E

OUTLINE DIMENSIONS

Dimensions shown in inches and (mm).

10-Lead ␮SOIC

(RM-10)

0.124 (3.15)

0.112 (2.84)

0.124 (3.15)

0.112 (2.84)

0.199 (5.05)

0.187 (4.75)

PIN 1

0.0197 (0.50) BSC

0.122 (3.10)

0.110 (2.79)

0.120 (3.05)

0.112 (2.84)

0.038 (0.97)

0.030 (0.76)

0.043 (1.09)

0.037 (0.94)

6؇

SEATING

PLANE

0.006 (0.15) 0.016 (0.41)

0.002 (0.05) 0.006 (0.15)

0؇

0.022 (0.56)

0.021 (0.53)

0.011 (0.28)

0.003 (0.08)

–6–

REV. 0

ADM101E [ADI]

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