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| 5V Operating IR Receiver with Excellent Noise Performance for R/C ADT2450 General Description ADT2450 is a miniaturized receiver IC for use in the infrared remote control system. It has 5V voltage operating, a high sensitivity, and good noise immunity to a power and external light. This can also be suitable for high optical and electrical disturbances and good for an 5V application system. It has the frequency selecting Pads for setting the center frequency of band-pass filter and also has 5 trimming Pads for the fined adjust of center frequency. This IC is capable of accepting a photodiode directly and include many excellent circuit such as an internal voltage reference for better temperature characteristics, a high gain initial amplifier, a gain control amplifier, a limiter, a band pass filter, a detection circuit, two comparator circuits, gain control circuits, integrator circuits, a waveform shaping circuit assembled on a single chip. This IC also has a powerful noise suppression to any kinds of external light. Features * 5V operating * Internal voltage reference and current reference circuit for better temperature characteristics * Maximum interference safety against optical and electrical disturbances * No external components necessary * The Center Frequency can be varied with option PADs ( 32.7kHz, 36.7kHz, 37.9kHz, 40kHz, 56.7kHz) * Internal filter for a high frequency lighting fluorescent lamp with AGC control (Powerful Noise cancel) * Open collector output (Open collector output with a pull-up resistor) * Output active low Absolute Maximum Ratings Parameter Supply Voltage Output Voltage Output Current Operating Temperature Storage Temperature Symbol Vcc Vout Iout Topr Tst Min. 0 0 0 -20 -40 Max. 6.0 6.0 2.5 80 125 Unit V V mA * Stress above those listed under Absolute Maximum Ratings may cause permanent damage of device. This is stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for longer periods may affect device reliability. During overload conditions (VIN>Vcc or VIN 1/4 http://www.ad-tech.co.kr 5V Operating IR Receiver with Excellent Noise Performance for R/C Recommended Operating Conditions Parameter Operating Voltage Input Frequency Operating Temperature Functional Block Diagram VCC Noise Det. & Gain Ctrl With gap det. Band-pass Filter Voltage & Current Reference Circuit ADT2450 Symbol Vcc Fin Top Min. 4.5 30 -20 Typ. 5.0 38 25 Max. 5.5 60 80 Unit V kHz IN I-V Converter & Input Bias Control Pre Amp AGC Amp Limit Amp Comparator Integrator & Wave Shaping Output Stage OUT Fset Bias Circuit Frequency Setting Frequency Trimming Threshold Control Circuit Freq.Selection Option Pads (S1~S4) Trimming Pads(T1~T5) GND * fc(center frequency) can be varied with 4 option Pads : 32.7kHz, 36.7kHz, 37.9kHz, 40.0kHz, 56.7kHz Fc(Center Frequency) 32.7 kHz 36.7 kHz 37.9 kHz 40.0 kHz 56.7 kHz PAD Setting Method (S1,S2,S3,S4) S4(PAD10) is Ground S3(PAD11) is Ground S2(PAD12) is Ground S1(PAD13) is Ground No Connection Feb. 05. 2005 / Rev. 0.0 2/4 http://www.ad-tech.co.kr 5V Operating IR Receiver with Excellent Noise Performance for R/C Electrical Specifications Specifications hold over the Recommended Operating Conditions, unless otherwise noted herein. All values are at 25 and Vcc=5.0V. ADT2450 Parameter Supply Current Max. Input current Max. Voltage gain Symbol Icc IIN Av Min. Typ. Max. Unit --300 85 1.2 95 2.5 800 110 mA uA dB Conditions Iin = 0 Vin = 0 V fin=37.9kHz,Vin=30 p-p When AGC is Off. -3dB Bandwidth Vin=30 p-p fin=37.9kHz, burst wave Vin=500 p-p note*1 fin=37.9kHz, burst wave Vin= 50mVp-p note*1 BPF Bandwidth fBW - 4.0 6.0 kHz tPW1 Output pulse width tPW2 500 - 800 500 - 800 Low level output voltage High level output voltage Note 1 : (Input burst waveform) VOL - 0.2 0.4 V Isink=2.5mA VOH 4.8 5.0 - V - Carrier Frequency : 37.9kHz 600 600 600 600 600 (Output pulse) Feb. 05. 2005 / Rev. 0.0 3/4 http://www.ad-tech.co.kr 5V Operating IR Receiver with Excellent Noise Performance for R/C Application Guide 1. Example of Module(37.9kHz) Packaging Using ADT2450 R1 : 100ohm ADT2450 VCC IN fc set pins S1 ADT2450 VCC OUT GND OUT C1 : 4.7uF S2 S3 S4 GND 2. Functional Guide of ADT2450 -. ADT2450 has high gain amplifier for high sensitivity. So if you want better characteristic of receivable distance, you have much careful attention in bonding of GND pads and shielding to GND. -. For more better distance performance, it is important to suppress the supply noise. The supply filter R1,C1 have to be located close to IC if possible. -. The photo diode are the important factor in IR receiver module and you select it considerately. -. In packaging of IR module, the photo lens is good for receiving of photo signal. But if the chip is included in the lens, the chip also receives the photo signal and the signal acts as a noise in the chip. So when you design the lens or module frame, the above point must be considered. -. In the detection or demodulation(wave shape) of incoming signal, ADT2450 need the minimum burst length of modulated signals. The incoming photo signal is modulated with proper carrier signal(e.g.37.9kHz) and if the `1' data bit is modulated with carrier signal, the period of data bit'1' is important. Because the carrier signals is in this period, in the Integrator & Wave Shape block of ADT2450 the integration need minimum period to the reach of appropriately level. Hence the minimum burst length is important characteristic and specification of remote control systems. The minimum burst length of ADT2450 is about 10~11 cycles of carrier. (~10~11*Tfc) You can easily understand as see the figure 1. Figure 1. Carrier Frequency : 37.9kHz (Input burst waveform) Burst length (Integrator output) (Output pulse) The minimum Burst length * The min. burst length of ADT2450 : ~10-~11cycles of carrier (~10~11*Tfc) Feb. 05. 2005 / Rev. 0.0 4/4 http://www.ad-tech.co.kr |
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