2

IR Receiver Modules for Remote Control Systems

Block Diagram

NEC, RC5, RC6, Toshiba Micon Code, Sharp Code, Grundig CodeSony 12bit, Sony 15bit, Matsushita code, Mitsubishi Code, Zenith Code, JVC code

Suitable Data Format

DescriptionThe ROM-WT/WC/WS xxxxxxx (N)-X is a Bi-CMOS IC for use in infrared remote control system.It consist of automatic gain control amplifier,post amplifier,Oscillator, automatic gain control circuit, a band pass filter,

a signal waveform detection circuit,automatic threshold control circuit,a waveform rectifier.

CLT138TN2(N)

Features

· Supply Voltage Range: 2.7V ~ 6 V

· TTL and CMOS compatibility

· No external components Except PIN Diode

· Available for Carrier Frequencies between 32.7kHz to 56.7kHz,

( Adjusted by zener-Diode Fusing, or using frequency selection PADs.

(Refer to frequency selection table & bonding option.) )

· Internal filter for PCM frequency

· Open collector output (built-in Pull-up resistor 42 )

· Output active low

· Enhanced Immunity against all kinds of disturbance light and power noise

· No occurrence of disturbance pulses at output pin within nominal

conditions.

· Short settling time after power On ( below 1msec)

Applications· TV, VCR, AUDIO· Home Appliances· Remote Control Equipment

INInput

AGCControl

WaveformRectifier

OUT

Oscillator

AGC

GND

VCC

42KohmPostAmp.

BGR

BPFWaveformDetector &

ATC

Fc set

TrimmingFreq. selection

Ordering Info.(carrier frequencies)

37.9 ROM-WT/WC/WSX38XX(N)-X40.0 ROM-WT/WC/WSX40XX(N)-X56.7 ROM-WT/WC/WSX56XX(N)-X

36.7 ROM-WT/WC/WSX36XX(N)-X32.7 ROM-WT/WC/WSX32XX(N)-X

Carrier Frequency

Type

3

Electro-optical Characteristics

(Ta = 25)

(Ta = 25)

** Arrival Distance Effected by Environment

7506004503

7506004503

0.40.23

--Vcc-0.53

+5fo-53

1.20.90.53

5

5

5

5

5

5

Vcc

ms23Fig. 9tPauseMinimum Data Pause Time between the data commands.(tPause)

Fig.

1,2,3

Fig.1

Fig.1

Fig.1

Fig.1

No input signal

V0.40.2-

VOLLow Level Output Voltage

V--Vcc-0.5

VOHHigh Level Output Voltage

-940-λPPeak Wave Length

％+3fo-3

fOB.P.F Center Frequency

m

-15-±0˚

LArrival Distance

750600450

TWLLow Level Output Pulse Width

750600450

TWHHigh Level Output Pulse Width

-

-

0.8

2.7

Min

8

12

1.2

-

Typ

-

-

1.5

6.0

Max

Active Low

ICC

VCC

Symbol

±45˚

±30˚

Conditions

Output Form

Supply Current

V Supply Voltage

UnitParameter``

Power supply

47uF

200Ω

VCCA further influence to the IR receiver modules may come from a supply voltage which is not stable. Such a disturbed supply voltage can caused by switching power supply.which is not filtered well or by other components in the circuit which

produced spikes on the supply line.This disturbed supply will reduce the sensitivity of receiver modules.

This application circuit will filter the disturbed supply voltage.

Application for power supply ripple suppression

Application Guide

Absolute Maximum Ratings

260±5, Max 5 secTsdSoldering Temperature

V6.50VCCSupply Voltage

mA

V

mA

Unit

85-25TambOperating Temperature

85-30TstgStorage Temperature

2.50IoutOutput Current

6.50VoutOutput Voltage

30ICCSupply Current

Max.Min.SymbolParameter

CLT138TN2(N)

4

Measurement Conditions

[ Fig.1 ] f=37.9KHz, burst with 22 pulses

※ The specifications shall be satisfied under the following conditions. The standard transmitter shall be specified of the burst wave form adjusted to VOUT 200mVp-p upon Po measuring circuit Standard Transmitter

VCC

GND

PDS/Transmitter 10

10

VOUT

10

30

[ Fig.2 ] Transmitter

Output pulse

600 600

Input

: Indicates horizontal andvertical directions

Vout

GND

Vcc

osc

Transmitter

[ Measurement condition for arrival distance ]

Ambient light source : Detecting surface illumination shall be irradiate 200±50Luxunder ordinary white fluorescence lamp without high frequency lighting

[ Fig.3 ] Test condition of arrival distance

CLT138TN2(N)

5

Electrical/Optical Characteristics

[ Fig.5 ] Relative Spectral Sensitivity vs.Wavelength[ Fig.4 ] Supply Current vs. Voltage

[ Fig.6 ] Output Pulse Width vs. Distance [ Fig.7 ] Directivity (Horizontal/Vertical)

[ Fig.8 ] BPF Fc Curve

>±2000VMin

±2000VC=100, R=1.5

Human Body Model

>±800VMin

±800VR=100, 1Ω

Charged Device Model

>±200VMin

±200VC=200, R=0Ω

Machine Model

ResultsSpecificationConditionsParameter

ESD Test Results

Relafive Frequency

Relafi

ve Amp

litu

de

Supply Voltage(V)

Supp

ly Cur

rent(mA)

λ-Wavelength(nm)

S(λ)rel

-Relative

Spectral S

ensitivity

100

9080˚

0˚ 20˚

40˚

60˚

060 2080 40

Rela

tive

Radia

nt(

˚)

Relative Sensitivity(%)

V

H

CLT138TN2(N)

6

The circuit of the ROM-WT/WC/WS XXXXX(N)-X series is designed in that way that unexpected output pulses due to noise or disturbance signals are avoided. A band pass filter, an integrator stage and an automatic gain control are used to suppress such disturbances. The distinguishing mark between data signal (not suppressed) and disturbance signal (suppressed) are carrier frequency, burst length and Signal Gap Time (see diagram below).

The data signal should full-fill the following condition :Carrier frequency should be close to center frequency of the band-pass.Burst length should be 300us/burst or longer.After each burst a gap time of at least 300us is necessary.The data format should not make a continuous signal transmission. There must be a Signal Gap Time (longer than 23 ms) at least each 100 ms, or each data command.

Some examples for suitable data format are :NEC Code, RC5, Toshiba Code, Matsushita Code. Mitsubishi Code. Sony Code.

※ t Gap : Signal gap time between two burst in pulses of carrier.※ t pause : Data pause between two data words.※ t Burst : Length of a burst in pulses of the carrier frequency.

[ Fig. 9 ] Data Signal diagram

Suitable Data Format

Disturbance Suppression

When a disturbance signal is applied to the ROM-WT/WC/WS XXXXX(N)-X series. it can still receive the data signal. However the sensitivity is reduced to that level that no unexpected pulses will occurrence.Some examples for such disturbance signals which are suppressed by the ROM-WT/WC/WS XXXXX(N)-X series are :

Signals from fluorescent lamps with electronic ballast with high or low modulation.Continuous signal at 38 kHz or at any other frequency,DC light (from tungsten bulb or sunlight)

t PauseData Word

(Output pulse)

Carrier Frequency : fo

t Gap

enlarge

t Burst

CLT138TN2(N)

7

External Dimension (Unit : mm)

1 2 3

3 Vcc

(UNIT:mm)

2. G.T ±0.3

GND

Vout

1. PIN CONFIG.

2

1

NOTE:

CLT138TN2(N)