MC14568BCP 데이터 시트보기 (PDF) - Motorola => Freescale

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MC14568BCP

Phase Comparator and Programmable Count

Motorola => Freescale 

If used in cascade with the programmable divide–by–N

counter, practically all usual reference frequencies, or chan-

nel spacings of 25, 20, 12.5, 10, 6.25 kHz, etc. are easily

achievable.

PROGRAMMABLE DIVIDE–BY–N

4–BIT COUNTER (D2)

This counter is programmable by using inputs DP0 ... DP3

(pins 7 ... 4). The Preset Enable input enables the parallel

preset inputs DP0... DP3. The “0” output must be externally

connected to the PE input for single stage applications.

Since there is not a cascade feedback input, this counter,

when cascaded, must be used as the most significant digit.

Because of this, it can be cascaded with binary counters as

well as with BCD counters (MC14569B, MC14522B,

MC14526B).

TYPICAL APPLICATIONS

CF

fin

C

MC14569B

ZERO DETECT

CF

C MC14522B Q4

OR

PE MC14526B “0”

CF

C MC14522B Q4

OR

PE MC14526B “0”

Q1/C2

MC14568B

PE

“0”

DP0 – – – – – – DP3

DP0 – – – – – – DP3

DP0 – – – – – – DP3

LSD

MSD

fout

Figure 6. Cascading MC14568B and MC14522B or MC14526B with MC14569B

(40 kHz)

VSS

PCin

PCout

C1 MC14568B G

CTI

F

“0”

Q1/C2

PE

DP0 – – – – DP3

VSS

VSS

Q

CF

MC14569B C

ZERO DETECT

VCO

MC14011

fout

(144 – 146 MHz)

VDD

MIXER

2k

2M

Frequencies shown in parenthesis are given as an example.

Figure 7. Frequency Synthesizer with MC14568B and MC14569B Using a Mixer

(Channel Spacing 10 kHz)

CRYSTAL

OSCILLATOR

(143.5 MHz)

MC14568B

8

MOTOROLA CMOS LOGIC DATA

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