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STB4395A 数据表(PDF) 9 Page - STMicroelectronics |
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STB4395A 数据表(HTML) 9 Page - STMicroelectronics |
9 / 16 page 5 - POWER SUPPLIES 5.1 - Supplies The chip operates from a power supply of 3.0 to 5.5 Volts. All interface circuits to the baseband chips are operated between these supplies. Six on-chip regulators are included on-chip which provide to all parts of the circuit separate regulated voltage supplies of -2.85 ±0.15 Volts relative to the top rail for the RF circuitry, the IF circuitry, the digital circuitry and for the three VCO’s. The chip can be operated in 3 modes, power down, receive and transmit. Power down is activated tak- ing the Pin EN to VN . To transfer to the receive mode, NTXEN is taken to VP. The built-in regulators can be by-passed ,if so required. 5.2 - Ground Plane Connections The chip has been designed to be decoupled to the positive supply, VP , at many points. Therefore it is strongly recommended that the chip be mounted on a board with a ground plane connected to VP. Because the base band chip is specified relative to a negative ground, it is further recommended that the board used is a 4 layer board with both a positive, VP , and negative ground plane VN . This has the additional advantage of providing good high frequency decoupling between supplies. The question as to whether to call VP or VN ground depe nds on which external equipment is con- nected. For testing the baseband section, this is VN ; for testing the radio chip, this is VP.In a product, this will depend on the application. For clarity all voltages specified in this document will be specified with respect to the supply, VP or VN , that the voltage normally tracks with when the supply is varied. 6 - ELECTRICAL CHARACTERISTICS Symbol Parameter Min. Typ. Max. Unit VN Power Supply Voltage (unregulated) -3 -5.5 V VREG Power Supply bypassing Internal Regulators (this is also interface supply) -2.7 -3 V IRX Receive Mode 32 40 mA ITX Transmit Mode 68 80 mA IQ Standby/Power Down 20 µA 7 - TIMING INFORMATION 7.1 - Turn on-off Times Times are relative to the NTXEN transition (high to low for receive to transmit and low to high for transmit to receive). Symbol Parameter Min. Typ. Max. Unit tON Turn-on Time From standby to receive 10 µs tRAMPON PA Power Ramp up to reach -3dB of final power 27.78 µs tTXRX Switchover Time Transmit to Receive (LNA/first mixer active) 27.78 µs 7.2 - Channel Select Timing PRGCLK must be high before NPRGEN goes low to programme the synthesizer. Figure 2 : Timing of Serial Programming Data NPRGEN PRGCLK PRGD PROGRAM CODE Orde r of NPRGEN &PRGD unimportant Code cha nge s on Rising Edge of NPRGEN Note that although a new program code is implemented on the rising edge of the NPRGEN, the transmitted power level is delayed until at the start of the next burst of transmission. In order to change transmit power during a conversation, the required power code must be serially loaded with the power change instruction. STB4395 9/16 |
类似零件编号 - STB4395A |
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类似说明 - STB4395A |
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