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MC13158 Datasheet(PDF) 10 Page - Motorola, Inc |
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MC13158 Datasheet(HTML) 10 Page - Motorola, Inc |
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10 / 24 page  MC13158 10 MOTOROLA ANALOG IC DEVICE DATA PIN FUNCTION DESCRIPTION (continued) Description/External Circuit Requirements Internal Equivalent Circuit Symbol Pin 25 Enable 2 VCC1 Enable The IC regulators are enabled by placing this pin at VEE. 26 VEE1 VEE1 26 25 Enable VCC2 7 VEE2 16 VEE1 26 VCC1 2 VCC and VEE ESD Protection ESD protection diodes exist between the VCC and VEE pins. It is important to note that significant differences in potential (> 0.5 VBE) between the two VCC pins or between the VEE pins can cause these structures to start to conduct, thus compromising isolation between the supply busses. VCC1 & VCC2 should be maintained at the same DC potential, as should VEE1 & VEE2. 28 29 Osc Base Osc Emitter Osc Base 28 VCC1 2 Oscillator Base This pin is connected to the base lead of the common collector transistor. Since there is no internal bias resistor to the base, VCC is applied through an external choke or coil. Oscillator Emitter This pin is connected to the emitter lead; the ii d i ll VEE1 26 Osc Emitter 29 p emitter is connected internally to a current source of about 200 µA. Additional emitter current may be obtained by connecting an external resistor to VEE; IE = V29/R29. Details of circuits using overtone crystal and LC varactor controlled oscillators are discussed in the application section. 31 32 Mix In1 Mix In2 RF In2 32 26 VEE1 RF In1 31 2 VCC1 Mixer Inputs The parallel equivalent differential input impedance of the mixer is approximately 2.0 k Ω in parallel with 1.0 pF. This equates to a single ended input impedance of 1.0 k Ω in parallel with 2.0 pF. The application circuit utilizes a SAW filter having a differential output that requires a 2.0 k Ω II 2.0 pF load. Therefore, little matching is required between the SAW filter and the mixer inputs. This and alternative circuits are discussed in more detail in the application section. |
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Descripción similar - MC13158 |
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