Datenblatt-Suchmaschine für elektronische Bauteile |
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MC13175 Datenblatt(PDF) 4 Page - Motorola, Inc |
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MC13175 Datenblatt(HTML) 4 Page - Motorola, Inc |
4 / 17 page MC13175 MC13176 4 MOTOROLA RF/IF DEVICE DATA PIN FUNCTION DESCRIPTIONS Pin Symbol Internal Equivalent Circuit Description/External Circuit Requirements 8 Xtale VCC 9 Xtalb 12k 8.0k Crystal Oscillator Inputs The internal reference oscillator is configured as a common emitter Colpitts. It may be operated with either a fundamental or overtone crystal depending on the carrier frequency and the internal prescaler. Crystal oscillator circuits and specifications of crystals are discussed in detail in the applications section. Wi h V Vd h l Pi i i l 9 Xtalb Xtale 8 9 4.0k ypp With VCC = 3.0 Vdc, the voltage at Pin 8 is approximately 1.8 Vdc and at Pin 9 is approximately 2.3 Vdc. 500 to 1000 mVp–p should be present at Pin 9. The Colpitts is biased at 200 µA; additional drive may be acquired by increasing the bias to approximately 500 µA. Use 6.2 k from Pin 8 to ground. 10 Reg. Gnd VCC 5.0p Reg Regulator Ground An additional ground pin is provided to enhance the stability of the system. Decoupling to the VCC (RF ground) is essential; it should be done at the ground return for Pin 10. 11 Enable Reg. Gnd 10 Subcon Enable 11 5.0p 8.0k 2.4k Device Enable The potential at Pin 11 is approximately 1.25 Vdc. When Pin 11 is open, the transmitter is disabled in a power down mode and draws less than 1.0 µA ICC if the MOD at Pin 16 is also open (i.e., it has no current driving it). To enable the transmitter a current source of 10 µA to 90 µA is provided. Figures 3 and 4 show the relationship between ICC, VCC and Ireg. enable. Note that ICC is flat at approximately 10 mA for Ireg. enable = 5.0 to 100 µA (Imod = 0). 12 VCC VCC VCC 12 Supply Voltage (VCC) 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. 13 & 14 Out 1 and Out 2 VCC 16 14 13 Differential Output The output is configured differentially to easily drive a loop antenna. By using a transformer or balun, as shown in the application schematic, the device may then drive an unbalanced low impedance load. Figure 6 shows how much the Output Power and Free–Running Oscillator Frequency change with temperature at 3.0 Vdc; Imod = 2.0 mA. 15 Out_Gnd Imod Out 2 Out 1 16 14 13 Output Ground This additional ground pin provides direct access for the output ground to the circuit board VEE. 16 Imod Out_Gnd 15 AM Modulation/Power Output Level The DC voltage at this pin is 0.8 Vdc with the current source active. An external resistor is chosen to provide a source current of 1.0 to 3.0 mA, depending on the desired output power level at a given VCC. Figure 28 shows the relationship of Power Output to Modulation Current, Imod. At VCC = 3.0 Vdc, 3.5 dBm power output can be acquired with about 35 mA ICC. For FM modulation, Pin 16 is used to set the desired output power level as described above. For AM modulation, the modulation signal must ride on a positive DC bias offset which sets a static (modulation off) modulation current. External circuitry for various schemes is further discussed in the Applications Information section. |
Ähnliche Teilenummer - MC13175 |
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Ähnliche Beschreibung - MC13175 |
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