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MB8719

This document describes a PLL synthesizer circuit that uses a 6-bit or 7-bit programmable divider to divide an input frequency. It down converts the output frequency to the input frequency using a mixer and crystal oscillator, where the crystal frequency is equal to the output frequency minus the input frequency. The output frequency can be changed by changing the crystal or adding additional crystals to the oscillator. Truth tables show how the divider value is programmed using the binary inputs to the circuit.

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1K views3 pages

MB8719

This document describes a PLL synthesizer circuit that uses a 6-bit or 7-bit programmable divider to divide an input frequency. It down converts the output frequency to the input frequency using a mixer and crystal oscillator, where the crystal frequency is equal to the output frequency minus the input frequency. The output frequency can be changed by changing the crystal or adding additional crystals to the oscillator. Truth tables show how the divider value is programmed using the binary inputs to the circuit.

Uploaded by

mivica2
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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MB8719 MB8734 RCI8719 PLL Synthesizer

Overview

This PLL-circuit use a 6 bit (MB8734 and RCI8719) or 7 bit (MB8719) BCD binary
programmable divide-by-N counter.

Down-
Down-converting of the frequency to the divider
divider

This PLL Circuit use a Mixer and a X-Tal Oscillator to convert the output frequency f OUT to the f IN to the PLL
Circuit.
The X-Tal frequency is f XTAL =f OUT -f IN

The output frequency can be changed by changing the mixing-xtal or add a


new mixing-xtal to the oscillator.
Pin Name Description

1 Out Inverter out

2 In Inverter in

3 Out Inverter out

4 In Inverter in

5 CP Charge Pump

6 LD Loop Detect

7 OSC in Oscillator input

8 OSC out Oscillator output

9 VDD Positive Power Supply

10 P6 Programmable inputs (Binary) (Only MB8719)

11 P5 Programmable inputs (Binary)

12 P4 Programmable inputs (Binary)

13 P3 Programmable inputs (Binary)

14 P2 Programmable inputs (Binary)

15 P1 Programmable inputs (Binary)

16 P0 Programmable inputs (Binary)

17 F in Frequency input

18 VSS GND Ground

Explanation of pin function terms

TRUTH TABLE FOR RCI8719 AND MB8734

P5 P4 P3 P2 P1 P0 Divide by N

0 0 0 0 0 0 0 + 128

0 0 0 0 0 1 1 + 128

0 0 0 0 1 0 2 + 128

0 0 0 0 1 1 3 + 128

0 0 0 1 0 0 4 + 128

- - - - - - -

- - - - - - -

1 1 1 1 1 1 64 + 128
TRUTH TABLE FOR MB8719

P6 P5 P4 P3 P2 P1 P0 Divide by N

0 0 0 0 0 0 0 0 + 128

0 0 0 0 0 0 1 1 + 128

0 0 0 0 0 1 0 2 + 128

0 0 0 0 0 1 1 3 + 128

0 0 0 0 1 0 0 4 + 128

- - - - - - - -

- - - - - - - -

0 1 1 1 1 1 1 64 + 128

1 0 0 0 0 0 0 0 + 64

1 0 0 0 0 0 1 1 + 64

1 0 0 0 0 1 0 2 + 64

1 0 0 0 0 1 1 3 + 64

1 0 0 0 1 0 0 4 + 64

1 - - - - - - -

1 - - - - - - -

1 1 1 1 1 1 1 64 + 64

Uniden AM/FM/SSB Chassis

www.DataSheet4U.com
www.DataSheet4U.com

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