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SLRC400 Datasheet(PDF) 110 Page - NXP Semiconductors |
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SLRC400 Datasheet(HTML) 110 Page - NXP Semiconductors |
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110 / 130 page  Philips Semiconductors Product Specification Rev. 2.0 November 2001 I •CODE Reader IC SL RC400 110 Preliminary 17.2 Circuit Description 17.2.1 EMC LOW PASS FILTER The I •CODE system operates at a frequency of 13.56 MHz. This frequency is generated by a quartz oscillator to clock the SL RC400 and is also the basis for driving the antenna with the 13.56 MHz carrier frequenzy. This will not only cause emitted power at 13.56 MHz but will also emit power at higher harmonics. The international EMC regulations define the amplitude of the emitted power in a broad frequency range. Thus, an appropriate filtering of the output signal is necessary to fulfil these regulations. A multi-layer board it is strongly recommended to implement a low pass filter as shown in the circuit above. The low pass filter consists of the components L0 and C0. The values are given in table below. Note: To achieve best performance all components shall have at least the quality of the recommended ones. 17.2.2 RECEIVING CIRCUIT The internal receiving part of the SL RC400 uses a concept that benefits from both side-bands of the sub- carrier load modulation of the label response. It is recommended to use the internally generated VMID potential as the input potential of pin RX. To provide a stable reference voltage a capacitance C4 to ground has to be connected to VMID. The receiving part of the reader needs a voltage divider connected between the RX and the VMID pin. Additionally, it is recommended to use a series capacitance between the antenna coil and the voltage divider. The circuit diagram above shows the recommended receiving circuit. The receiving circuit consists of the components R1, R2, C3 and C4. The values are given in the table below. Components Value Remark L0 1 µH ± 5% Magnetic shielded e.g. TDK NL322522T-1R0J C0 2 * 68 pF ± 2% NP0 material, Value depending on the antenna inductance R1’ 3.9 k Ω ± 1% R1 560 Ω ± 1% R2 820 Ω ± 1% C3 1 nF ± 2% NP0 material Table 17-1: Values for the EMC- Filter and Receiving Circuit Note: It is recommended not to use X7R material for the capacitors. 17.3 Calculation of the Antenna Coil Inductance The precise calculation of the antenna coils inductance is not practicable but the inductance can be estimated using the following formula. We recommend designing an antenna either with a circular or rectangular shape. L nH l cm l D K N 1 1 1 1 1 1 8 2 [ ] [ ] ln , = ⋅ ⋅ − l1.............. Length of the conductor loop of one turn D1 ............ Diameter of the wire or width of the PCB conductor respectively K ............. Antenna Shape Factor (K = 1,07 for circular antennas and K = 1,47 for square antennas) N1 ............ Number of turns ln ............. Natural logarithm function |
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