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AS3901 Datasheet(PDF) 5 Page - ams AG |
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AS3901 Datasheet(HTML) 5 Page - ams AG |
5 / 18 page ISM 433/315 MHz FSK/ASK Transmitter – Data Sheet AS3901 Rev. 6, August 2000 Page 5 of 18 1.4 Driving Amplifier The driving amplifier has a differential open collector output optimized for driving of small, symmetrical high-impedance loop antennas. The amplifier drives a nominal RF current of 0.7 mArms.The maximal differential voltage swing is about 4 VPP. Therefore the output power ist a function of the connected load impedance. With a 2 k Ω differential load a nominal peak output power (to the antenna) of ≈1 mW is obtained. Please note that the finally radiated power (from antenna) is lower and strongly dependent on the efficiency (function of the size) of the antenna to be used. 1.5 ASK Modulation ASK modulation with a date rate upt to 20 kbits/s can be achieved by turning the driving amplifier and the FSK modulator by the TX/ASK pin on and off, where a TX/ASK = „H“ means a turned on state. 1.6 Power Management and Operation Modes For normal operation the switching between different operation modes follows a Grey- coded scheme to avoid unwanted switching between operation modes due to inaccurate occurrence of edges of STDBY and TX/ASK. Mode STDBY TX/ASK Function Standby 1 1 All Off Clock generator operation 1 0 XTAL oscillator on and CLOCK output active. Transmit operation 0 1 XTAL oscillator, PLL, FSK modulator running, (FSK operation or „H“transmitted at ASK). Turned off power 0 0 XTAL oscillator and PLL running, output amplifier and FSK modulator off, („L“ transmitted at ASK). 1.7 µC Interface and Timing The AS3901 contains a direct interface to a microcontroller (µC). The µC interface of the AS3901 consists of three input and two outputs pins: „Standby input“(STDBY). „Transmit / ASK input“(TX/ASK). „µC reset output (Active „L“)“(NRES). „µC clock output“(CLK). „FSK data input“(DATA). These lines support the µC with the required reset, clock and data signals. Lines 1 to 4 control the AS3901 internal power on/off circuit which wakes up and shuts down the whole transmitter consisting of the AS3901 and the µC. Figure 2 shows a typical interconnection of the AS3901 with a typical µC. Figure 3 presents a related timing for power up and down of the transmitter. |
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