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SL6609AKGNPDE Arkusz danych(PDF) 5 Page - Mitel Networks Corporation |
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SL6609AKGNPDE Arkusz danych(HTML) 5 Page - Mitel Networks Corporation |
5 / 18 page SL6609A 5 OPERATION OF SL6609A The SL6609A is a Direct Converson Receiver designed for use up to 470MHz. It is available in a 28 pin SSOP package and it integrates all the facilities required for the conversion of an RF FSK signal to a base-band data signal. Low Noise Amplifier To achieve optimum performance it is necessary to incorporate a Low Noise RF Amplifier at the front end of the receiver. This is easily biased using the on chip voltage and current sources provided. All voltages and current sources used for bias of the RF amplifier, receiver and mixers should be RF decoupled using suitable capacitors (see Fig.4 for a suitable Low-Noise- Amplifier). Local Oscillator The Local Oscillator signal is applied to the device in phase quadrature. This can be achieved with the use of two RC networks operating at the -3dB/45 ° transfer characteristic, giving a full 90 ° phase differential between the LO ports of the device. Each LO port of the device also requires an equal level of drive from the Oscillator. (see Fig.5). Pin Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Pin Description X channel pre-gyrator filter test-point. This can be used for input and output RF current source adjustment pin LO input channel Y Gyrator current adjust pin LO input channel X VREF 1.0 V internal signal ground Y channel pre-gyrator filter test point, input or output Audio AGC gain and threshold adjust. RSSI signal indicator Audio AGC time constant adjust Battery economy control Battery flag output Y channel limiter (post gyrator filter) test point, output only Supply connection Data output pin X channel limiter (post gyrator filter) test point, output only Bit rate filter 2, input to data output stage Bit rate filter 1, output from detector Digital ground Bandgap voltage output Battery flag input voltage Supply connection 1V regulator control external PNP drive 1V regulator output voltage Mixer input B Ground Mixer input A Current source for external LNA. Value of current output will decrease at high mixer input signal levels due to RF AGC Audio AGC output current Pin Name TPX RFIADJ LOY GYRI LOX VR TPY GTHADJ TCADJ BEC BATTFL TPLIMY VCC2 DATAOP TPLIMX BRF2 BRF1 DIG GND VBG VBATT VCC1 REGCNT VREG MIXB GND MIXA IRFAMP IAGCOUT Gyrator Filters The on chip filters include an adjustable gyrator filter. This may be adjusted with the use of an additional resistor between Pin 4 and GND. This allows flexibility of filter characterstics and also allows for compensation for possible process variations. Audio AGC The Audio AGC fundamentally consists of a current sink which is controlled by the audio (baseband data) signal. It has three parameters that may be controlled by the user. These are the Attack (turn on) time, Decay (duration) time and Threshold level (see Figs.6 and 7). See Application note for details. Regulator The on chip regulator must be used in conjunction with a suitable PNP transistor to achieve regulation. As the transistor forms part of the regulator feedback loop the transistor should exhibit the following characteristics:- H FE > = 100 for VCE > = 0.1V |
Podobny numer części - SL6609AKGNPDE |
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Podobny opis - SL6609AKGNPDE |
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