Maxim MAX3120CUA, MAX3120EUA, MAX3120CSA Datasheet

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General Description

The MAX3120 IrDA 1.2-compatible infrared transceiver
is optimized for battery-powered, space-constrained
applications. It consumes only 120µA while supporting
data rates up to 115kbps over a wide 3V to 5.5V oper­ating range, and features a 10nA shutdown mode to
further extend battery life.

The MAX3120 reduces the space required for IrDA
applications by requiring a minimum of external compo­nents: photodiode, infrared LED, and current-setting
resistor. Optical components are external to allow maxi­mum flexibility in PC board design. The MAX3120 is
available in 8-pin µMAX and SO packages. The µMAX
package consumes half the board space of an 8-pin
SO.

Applications

IrDA Applications
Personal Digital Assistants (PDAs)
Palmtop Computers
Cell Phones
Hand-Held Equipment
Peripherals

Features

♦ IrDA 1.2 Compatible: 2.4kbps to 115.2kbps
♦ +3V to +5.5V Single-Supply Operation
♦ Flexible Optics Selection and Layout
♦ 120µA Supply Current
♦ 10nA Shutdown Supply Current
♦ 200mA, High-Current Infrared LED Drive

MAX3120

Low-Profile, 3V, 120µA,

IrDA Infrared Transceiver

________________________________________________________________

Maxim Integrated Products

1

1
2
3
4

8
7
6
5

RXD
LEDC
PGND
SHDNPINC

GND

V

CC

TXD

MAX3120

µMAX/SO

TOP VIEW

19-1390; Rev 0; 10/98

PART

MAX3120CUA
MAX3120CSA
MAX3120EUA -40°C to +85°C

0°C to +70°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

8 µMAX
8 SO
8 µMAX

Pin Configuration

Ordering Information

MAX3120ESA -40°C to +85°C 8 SO

MAX3120

RXD PINC

LEDC

TXD

+3.3V

V

CC

SHDN

GND PGND

MAX3100

CS

SCLK

DIN

DOUT

RX

TX

V

CC

GND

PIN
DIODE

LED

Typical Operating Circuit

MAX3120

Low-Profile, 3V, 120µA,
IrDA Infrared Transceiver

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VCC= +3.0V to +5.5V, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C and VCC= +3.3V.)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.

(Referred to GND)
V

CC

...........................................................................-0.3V to +6V

TXD,

SHDN, LEDC ...................................................-0.3V to +6V

RXD ............................................................-0.3V to (V

CC

+ 0.3V)

PGND ....................................................................-0.1V to +0.1V

PINC....................................................................................10mA

Continuous LEDC Current.................................................200mA

Repetitive Pulsed LEDC Current

(<90µs, duty cycle <20%) ..........................................500mA

Continuous Power Dissipation (T

A

= +70°C)

µMAX (derate 4.1mW/°C above +70°C)....................330mW

SO (derate 5.88mW/°C above +70°C).......................471mW

Operating Temperature Ranges

MAX3120C_A....................................................0°C to +70°C

MAX3120E_A.................................................-40°C to +85°C

Junction Temperature......................................................+150°C

Storage Temperature Range.............................-65°C to +160°C

Lead Temperature (soldering, 10sec).............................+300°C

Data rate = 2.4kbps

TA= +25°C, SHDN = GND (Note 1)

Delay until maximum IR receiver data rate is
valid

Delay until ICC< 1µA

TA= +25°C, SHDN = VCC(Note 1)

VCC= 5.0V

VCC= 3.3V

(Note 3)

(Note 2)

I

SINK

= 200µA

VCC= 3.3V

C

LOAD

= 50pF

VCC= 5.0V

I

SOURCE

= 100µA

CONDITIONS

µs

190

IR Receiver Output Pulse Width

µs300Shutdown Disable Time

µs10Shutdown Time

375

µA

100

Ambient DC Current Rejection

mA0.0002 6Input Current Sensitivity

nA

RMS

10I

NOISE

Equivalent Input Noise Current

kbps2.4 115.2Supported Data Rates

ns50tr, t

f

Output Rise and Fall Time

V

CC

-V

CC

-

0.5 0.05

V

OH

µA0.01 1.0I

CC(SHDN)

Shutdown Supply Current

µA120 200I

CC

Supply Current

V

0.1 0.4V

OL

Output Voltage

pF2C

IN

Input Capacitance

µA-1 1I

LEAK

Input Leakage Current

V0.8V

IL

Input Logic Threshold Low

V

2.0

V

IH

Input Logic Threshold High

2.4

UNITSMIN TYP MAXSYMBOLPARAMETER

Data rate = 115.2kbps 18

DC CHARACTERISTICS

LOGIC OUTPUT (RXD)

LOGIC INPUTS (TXD, SHDN)

IR RECEIVER

MAX3120

Low-Profile, 3V, 120µA,

IrDA Infrared Transceiver

_______________________________________________________________________________________

3

0.6

0.8

1.2

1.0

1.4

1.6

-40 10-15 35 60 85

LED DRIVER

ON-RESISTANCE vs. TEMPERATURE

MAX3120 TOC01

TEMPERATURE (°C)

R

LEDC

(Ω)

I

LEDC

= 100mA

VCC = 3.3V

VCC = 5V

90

100

120

110

130

140

-40 10-15 35 60 85

SUPPLY CURRENT
vs. TEMPERATURE

MAX3120 TOC02

TEMPERATURE (°C)

SUPPLY CURRENT

(µA)

VCC = 3V

VCC = 5V

105

115

110

125

120

130

135

3.0 4.03.5 4.5 5.0 5.5

SUPPLY CURRENT

vs. SUPPLY VOLTAGE

MAX3120 TOC03

SUPPLY VOLTAGE (V)

SUPPLY CURRENT

(µA)

0

200

100

400

300

500

600

100 250 300150 200 350 400

LEDC VOLTAGE

vs. LEDC CURRENT

MAX3120 toc04

LEDC CURRENT (mA)

V

LEDC

(mV)

VCC = 3.3V

VCC = 5V

PULSED AT
20% DUTY CYCLE

Typical Operating Characteristics

(TA = +25°C, unless otherwise noted.)

CONDITIONS UNITSMIN TYP MAXSYMBOLPARAMETER

Transmitter Rise Time t

r

10% to 90% of 200mA drive current 20 600 ns

Transmitter Fall Time t

f

90% to 10% of 200mA drive current 20 600 ns

Transmitter Output Resistance I

OUT

= 200mA

1.15 2.0

Ω

0.9 1.6

Off-Leakage Current 0.01 10 µA

VCC= 5.0V

VCC= 3.3V

IR TRANSMITTER

Note 1: All supply current measurements are made under the following conditions: no load at all outputs, input voltages at GND or

V

CC

, no PIN diode input current.

Note 2: Equivalent input current noise is calculated by dividing the output noise of the transimpedance amplifier by the midband

transimpedance gain.

Note 3: Sensitivity is measured with an IrDA-compliant input signal, where the data rate is within the Supported Data Rate, rise/fall

times are less than 600ns, and pulse widths are between 1.41µs and 3/16 of the baud rate.

ELECTRICAL CHARACTERISTICS (continued)

(VCC= +3.0V to +5.5V, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C and VCC= +3.3V.)