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MC13158FTB Datasheet(PDF) 8 Page - Motorola, Inc |
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MC13158FTB Datasheet(HTML) 8 Page - Motorola, Inc |
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8 / 24 page  MC13158 8 MOTOROLA ANALOG IC DEVICE DATA PIN FUNCTION DESCRIPTION (continued) Description/External Circuit Requirements Internal Equivalent Circuit Symbol Pin 7 VCC2 330 64 k 64 k Li 10 VCC2 7 Supply Voltage (VCC2) This pin is VCC supply for the Limiter, Quadrature Detector, data slicer and RSSI buffer circuits. In the application PC board this pin is tied to a common VCC trace with VCC1. 8 9 Lim In Lim Dec1 330 64 k Lim Dec2 Limiter Input The limiter input impedance is 330 Ω. Limiter Decoupling 10 Dec1 Lim Dec2 Lim Dec1 9 Lim In 8 VEE2 16 Limiter Decoupling Decoupling capacitors are placed directly at these pins and to VCC (RF ground). Use the same procedure as in the IF decoupling. 11,14, 27 & 28 N/C No Connects There is no internal connection to these pins; however it is recommended that these pins be connected externally to VCC (RF ground). 12 Lim Out 13 Quad 12 Lim Out VCC2 7 Limiter Output The output impedance is low. The limiter drives a quadrature detector circuit with in– phase and quadrature phase signals. 13 Quad 16 VEE2 5.0 p Quadrature Detector Circuit The quadrature detector is a doubly balanced four–quadrant multiplier with an internal 5.0 pF capacitor between Pins 12 and 13. An external capacitor may be added to increase the IF signal to Pin 13. The quadrature detector pin is provided to connect the external RLC parallel resonant network which provides the 90 degree phase shift and drives the quadrature detector. 15 17 Det Gain Det Out Det Out 17 Det 15 7 VCC2 Detector Buffer Amplifier This is an inverting amplifier. An external feed- back resistor from Pin 17 to 15, (the inverting input) controls the output amplitude; another resistor from Pin 15 to the negative supply (Pin 16) sets the DC output level. A 1:1 resistor ratio sets the output DC level at two VBE with respect to VEE. A small capacitor from Pin 17 to 15 can be used to set the bandwidth. 16 VEE2 Out VEE2 16 Det Gain Supply Ground (VEE2) In the PCB layout, the ground pins (also applies to Pin 26) should be connected directly to chassis ground. Decoupling capacitors to VCC should be placed directly at the ground pins. |
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