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MAX3120CUAMAXN/a38avaiLow-Profile, 3V, 120レA, IrDA Infrared Transceiver
MAX3120ESAMAXIMN/a7avaiLow-Profile, 3V, 120レA, IrDA Infrared Transceiver
MAX3120EUAMAXIMN/a77avaiLow-Profile, 3V, 120レA, IrDA Infrared Transceiver


MAX3120EUA ,Low-Profile, 3V, 120レA, IrDA Infrared TransceiverELECTRICAL CHARACTERISTICS(V = +3.0V to +5.5V, T = T to T , unless otherwise noted. Typical values ..
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MAX3120CUA-MAX3120ESA-MAX3120EUA
Low-Profile, 3V, 120レA, IrDA Infrared Transceiver
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 oper-
ating 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 compo-
nents: photodiode, infrared LED, and current-setting
resistor. Optical components are external to allow maxi-
mum 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 OperationFlexible Optics Selection and Layout120µA Supply Current10nA Shutdown Supply Current200mA, High-Current Infrared LED Drive
MAX3120
Low-Profile, 3V, 120µA,
IrDA Infrared Transceiver

19-1390; Rev 0; 10/98
Pin Configuration
Ordering Information
Typical Operating Circuit
MAX3120
Low-Profile, 3V, 120µA,
IrDA Infrared Transceiver
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS

(VCC= +3.0V to +5.5V, TA= TMINto TMAX, 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)
VCC...........................................................................-0.3V to +6V
TXD, SHDN, LEDC...................................................-0.3V to +6V
RXD............................................................-0.3V to (VCC+ 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 (TA= +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
MAX3120
Low-Profile, 3V, 120µA,
IrDA Infrared Transceiver
Typical Operating Characteristics

(TA = +25°C, unless otherwise noted.)
Note 1:
All supply current measurements are made under the following conditions: no load at all outputs, input voltages at GND or
VCC, 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= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C and VCC= +3.3V.)
MAX3120
Low-Profile, 3V, 120µA,
IrDA Infrared Transceiver
Typical Operating Characteristics (continued)

(TA = +25°C, unless otherwise noted.)
MAX3120
Low-Profile, 3V, 120µA,
IrDA Infrared Transceiver
Pin Description
Detailed Description

The MAX3120 is an IrDA 1.2-compatible infrared (IR)
transceiver. By selecting appropriate external optical
components (see IR LED and PIN Photodiode Selection
section), the MAX3120 will operate at data rates of
2.4kbps to 115kbps at distances from 1cm to 1m.
Because of its low-noise design, the MAX3120
achieves a bit error rate (BER) below 10-8at maximum
data rates when used with the appropriate external
components. On-chip filtering rejects out-of-band
ambient light signals that would otherwise interfere with
IR communication. Also included in the MAX3120 is
a high-power LED driver capable of sinking 200mA. It
can drive most available IR LEDs at IrDA speeds of
2.4kbps to 115kbps.
Receiver

The MAX3120’s IR receiver amplifier reverse biases the
PIN diode by approximately 1.2V, and the PIN diode
converts pulses of IR light into pulses of current. The
input transimpedance (current-to-voltage) amplifier
then converts these current pulses into voltage pulses
of a useful magnitude. The MAX3120 filters the result-
ing output voltage pulses to remove low-frequency
ambient light interference and high-frequency circuit
noise. Finally, a high-speed comparator translates
these voltage pulses into usable CMOS output levels
(Figure 1).
MAX3120
Transmitter

The MAX3120’s IR transmitter consists of a high-power
MOS switch, capable of quickly switching 200mA with
less than 2Ωof on-resistance. Internal buffering keeps
the input capacitance of the TXD pin extremely low to
ease the input drive requirement. Connect an IR LED in
series with a current-setting resistor to select the appro-
priate IR output power (see the Powering the IR LED
section). Note that the transmitter does not have an
automatic shutoff circuit, so pay special attention to com-
ponent power dissipation in high-duty-cycle transmit
schemes.
Applications Information
IR LED and PIN Photodiode Selection

The IrDA specification calls for an IR transmitter with a
peak wavelength between 850nm and 900nm. Within a
±15°half-cone-angle, the output intensity of the IR LED
must be between 40mW/sr and 500mW/sr. Outside a
±30°half-cone-angle, the output intensity of the IR LED
must fall below 40mW/sr. The optical rise and fall times
of the IR LED must be less than 600ns. Based on these
system requirements, the Hewlett Packard HSDL-4220
or the Temic TSHF5400 IR LEDs are two appropriate
choices.
Appropriate PIN photodiode selection is extremely
important to system performance. The PIN diode must
generate at least 200nA (minimum sensitivity of the
MAX3120) of current when aimed ±15°off-axis with an
incident irradiance of 4µW/cm2. Use the following equa-
tion to determine if the Temic BPV22NF meets these
requirements:
The first term (4µW/cm2) is the minimum guaranteed
irradiance in the ±15°angular range. The second term
(0.075cm2) is the effective sensitive area of the PIN
diode. The factor of 1.8 accounts for the efficiency
increase due to the spherical lens. The first 0.95 factor
normalizes the sensitivity to the 875nm wavelength,
while the second 0.95 factor adjusts for decreased
receiver efficiency at ±15°off-axis. The last term,
0.6A/W, is the sensitivity of the PIN diode. In this exam-
ple, the Temic BPV22NF is an appropriate selection.
The final important factor in selecting a PIN diode is
effective diode capacitance. It is important to keep this
capacitance below 70pF at 1.2V reverse bias. Higher
input capacitance can compromise system noise per-
formance by increasing the noise gain of the input tran-
simpedance amplifier.
Powering the IR LED

Set the current in the IR LED using an external resistor.
Consult the IR LED manufacturer’s data sheet to select
a forward current that will meet IrDA specifications dis-
cussed in the IR LEDandPIN Photodiode Selection
section. Look up the drop across the LED (VLED) and
the drop across the MAX3120 LED driver (see Typical
Operating Characteristics- VLEDC) and choose the cur-
rent-setting resistor based on the following equation:
Using the Hewlett Packard HSDL-4220 IR LED as an
example, VCC= 5V, ISET= 100mA, and VLED= 1.67V,
therefore:
VLEDC= 0.08V
RSET= 32.5Ω
Low-Profile, 3V, 120µA,
IrDA Infrared Transceiver
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