MAX3120ESA+ Fast Delivery |IC PHOENIX CO.,LIMITED

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MAX3120ESA+
Low-Profile 3V, 120µA IrDA Infrared Transceiver
neral DescriptionThe 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
PeripheralsaturesIrDA 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
Low-Profile, 3V, 120μA,rDA Infrared Transceive
RXD
LEDC
PGND
SHDNPINC
GND
VCC
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. RANGEPIN-PACKAGE
8 μMAX
8 SO
8 μMAX
Pin Configuration
Ordering Information
MAX3120ESA-40°C to +85°C8 SO
MAX3120
RXDPINC
LEDCTXD
+3.3V
VCCSHDN
GNDPGND
MAX3100
SCLK
DIN
DOUT
VCC
GND
PIN
DIODE
LED
Typical Operating Circuit
Low-Profile, 3V, 120μA,rDA 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
Data rate = 2.4kbps= +25°C, SHDN= GND (Note 1)
Delay until maximum IR receiver data rate is
valid
Delay until ICC< 1μA= +25°C, SHDN= VCC(Note 1)
VCC= 5.0V
VCC= 3.3V
(Note 3)
(Note 2)
ISINK= 200μA
VCC= 3.3V
CLOAD= 50pF
VCC= 5.0V
ISOURCE= 100μA
CONDITIONS190IR Receiver Output Pulse Width300Shutdown Disable Time10Shutdown Time
375μA100Ambient DC Current Rejection0.00026Input Current Sensitivity
nARMS10INOISEEquivalent Input Noise Current
kbps2.4115.2Supported Data Rates50tr, tfOutput Rise and Fall Time
VCC -VCC -
0.50.05VOH0.011.0ICC(SHDN)Shutdown Supply Current120200ICCSupply Current
0.10.4VOL
Output Voltage 2CINInput Capacitance -11ILEAKInput Leakage Current 0.8VILInput Logic Threshold Low2.0VIHInput Logic Threshold High 2.4
UNITSMINTYPMAXSYMBOLPARAMETER
Data rate = 115.2kbps18
DC CHARACTERISTICS
LOGIC OUTPUT (RXD)
LOGIC INPUTS (TXD, SHDN)
IR RECEIVER
Low-Profile, 3V, 120μA,rDA Infrared Transceive
LED DRIVER
ON-RESISTANCE vs. TEMPERATURE
3120 TO
C01
TEMPERATURE (°C)
ILEDC = 100mA
VCC = 3.3V
VCC = 5V
SUPPLY CURRENT
vs. TEMPERATURE
3120 TO
C02
TEMPERATURE (°C)
(μ
VCC = 3V
VCC = 5V
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
AX3120 TOC
SUPPLY VOLTAGE (V)
(μ
LEDC VOLTAGE
vs. LEDC CURRENT
3120 toc04
LEDC CURRENT (mA)
(m
VCC = 3.3V
VCC = 5V
PULSED AT
20% DUTY CYCLE
Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
CONDITIONSUNITSMINTYPMAXSYMBOLPARAMETER
Transmitter Rise Timetr10% to 90% of 200mA drive current20600ns
Transmitter Fall Timetf90% to 10% of 200mA drive current20600ns
Transmitter Output ResistanceIOUT= 200mA1.152.0Ω0.91.6
Off-Leakage Current0.0110μA
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
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.)
Low-Profile, 3V, 120μA,rDA Infrared Transceiver
Typical Operating Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
RXD OUTPUT PULSE WIDTH
vs. DISTANCE
AX3120 TOC
DISTANCE (cm)
(μ
TRANSMITTER POWER = 200mW/sr
INPUT PULSE WIDTH = 1.63μs
TEMIC BPV22NF
VCC = 3.3V
2V/div
2V/div
RXD OUTPUT
vs. INFRARED INPUT
MAX3120 toc11
100μs/div
RXD
OUTPUT
INFRARED
INPUT
VCC = 3.3V, 2400bps AT 10cm DISTANCE,
TERMIC BPV22NF, TRANSMIT POWER 200mW/sr
2V/div
2V/div
RXD OUTPUT
vs. INFRARED INPUT
MAX3120 toc09
100μs/div
RXD
OUTPUT
INFRARED
INPUT
VCC = 3.3V, 2400bps AT 1cm DISTANCE,
TERMIC BPV22NF, TRANSMIT POWER 200mW/sr
2V/div
2V/div
RXD OUTPUT
vs. INFRARED INPUT
MAX3120 toc10
2μs/div
RXD
OUTPUT
INFRARED
INPUT
VCC = 3.3V, 115.2kbps AT 10cm DISTANCE,
TERMIC BPV22NF, TRANSMIT POWER 200mW/sr
2V/div
2V/div
RXD OUTPUT
vs. INFRARED INPUT
MAX3120 toc08
2μs/div
RXD
OUTPUT
INFRARED
INPUT
VCC = 3.3V, 115.2kbps AT 1cm DISTANCE,
TERMIC BPV22NF, TRANSMIT POWER 200mW/sr
RXD OUTPUT PULSE WIDTH
vs. DISTANCE
X3120 TO
C06
DISTANCE (cm)
(μ
TRANSMITTER POWER = 200mW/sr
INPUT PULSE WIDTH = 78μs
TEMIC BPV22NF
VCC = 3.3V
AMBIENT PHOTODIODE CURRENT REJECTION
vs. SUPPLY VOLTAGE
AX3120 TOC05
SUPPLY VOLTAGE (V)
(μ
Low-Profile, 3V, 120μA,rDA Infrared Transceive
2V/div
2V/div
RXD OUTPUT
vs. INFRARED INPUTMAX3120 toc12
2μs/div
RXD
OUTPUT
INFRARED
INPUT
VCC = 3.3V, 115.2kbps AT 1m DISTANCE,
TERMIC BPV22NF, TRANSMIT POWER 200mW/sr
2V/div
2V/div
RXD OUTPUT
vs. INFRARED INPUT
MAX3120 toc13
100μs/div
RXD
OUTPUT
INFRARED
INPUT
VCC = 3.3V, 2400bps AT 1m DISTANCE,
TERMIC BPV22NF, TRANSMIT POWER 200mW/sr
Typical Operating Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
Pin Description
NAMEFUNCTIONTXDIR Transmitter TTL/CMOS Data Input. High = LED on.VCCSupply Voltage
PINGNDGround. Connect anode of PIN diode to GND. Connect GND to PGND.PINCPIN Diode Cathode Input. Connect cathode of PIN diode to PINC.RXDIR Receiver TTL/CMOS Data Output. Pulses low for IR input pulse.LEDCLED Driver Output. Connect cathode of IR-emitting LED to LEDC.PGNDPower Ground. Ground for IR LED driver. Connect PGND to GND. SHDNShutdown Input. Active low. tailed 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).
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= V-V-VSETCCLEDLEDC
SETPIN=W/cm)(0.075cm)(1.8)(0.95)(0.6A/W)
291nA22
Low-Profile, 3V, 120μA,rDA Infrared Transceiver
Figure 1. Functional Diagram
MAX3120
BIAS
BANDPASS
FILTER
SHDNVCC
RXDTXDLEDC
PGND
PINC
1.2V
GND

Partno	Mfg	Dc	Qty	Available	Descript
MAX3120ESA+ \|MAX3120ESA	MAXIM	N/a	12	avai	Low-Profile 3V, 120µA IrDA Infrared Transceiver