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MC13158FTB Datasheet(PDF) 7 Page - Motorola, Inc |
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MC13158FTB Datasheet(HTML) 7 Page - Motorola, Inc |
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7 / 24 page  MC13158 7 MOTOROLA ANALOG IC DEVICE DATA The recovered data signal from the quadrature detector can be DC coupled to the data slicer DS IN1 (Pin 18). In the application circuit shown in Figure 1 it will be centered at 2.0 VBE and allowed to swing ± VBE. A capacitor is placed from DS IN2 (Pin 20) to VEE. The size of this capacitor and the nature of the data signal determine how faithfully the data slicer shapes up the recovered signal. The time constant is short for large peak to peak voltage swings or when there is a change in DC level at the detector output. For small signal or for continuous bits of the same polarity which drift close to the threshold voltage, the time constant is longer. A unique feature of the data slicer is that the inverting switching stages in the comparator are supplied through the emitter pin of the output transistor (Pin 22 – DS Gnd) to VEE rather than internally to VEE. This is provided in order to reduce switching feedback to the front end. A control pin is provided to shut the data slicer output off (DS “off” – Pin 19). With DS “off” pin at VCC the data slicer output is shut off by shutting down the base drive to the output transistor. When a channel is being monitored to make an RSSI measurement, but not to collect data, the data output may be shut off to save current. PIN FUNCTION DESCRIPTION Pin Symbol Internal Equivalent Circuit Description/External Circuit Requirements 1 2 Mix Out VCC1 Mix Out 1 VCC1 2 Mixer Output The mixer output impedance is 330 Ω; it matches to 10.7 MHz ceramic filters with 330 Ω input impedance. Supply Voltage (VCC1) This pin is the VCC pin for the Mixer, Local Oscillator, and IF Amplifer. The operating Out VEE1 26 Oscillator, and IF Amplifer. The operating supply voltage range is from 1.8 Vdc to 5.0 Vdc. In the PCB layout, the VCC trace must be kept as wide as possible to minimize inductive reactances along the trace; it is best to have it completely fill around the surface mount components and traces on the circuit side of the PCB. 3 4 IF In IF 330 64 k 64 k IF Dec2 5 VCC1 2 IF Input The input impedance at Pin 3 is 330 Ω. It matches the 330 Ω load impedance of a 10.7 MHz ceramic filter. Thus, no external matching is required. IF DEC1 & DEC2 5 Dec1 IF Dec2 IF Dec1 4 IF In 3 VEE1 26 IF decoupling pins. Decoupling capacitors should be placed directly at the pins to enhance stability. Two capacitors are decoupled to the RF ground VCC1; one is placed between DEC1 & DEC2. 6 IF Out IF Out 5 VEE1 26 VCC1 2 IF Output The output impedance is 330 Ω; it matches the 330 input resistance of a 10.7 MHz ceramic filter. |
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