MC145202 데이터 시트보기 (PDF) - Motorola => Freescale

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MC145202

Low-Voltage 2.0 GHz PLL Frequency Synthesizer Includes On-Board 64/65 Prescaler

Motorola => Freescale 

THRESHOLD

+3 V

DETECTOR

1 REFout

REFin 20

INTEGRATOR

2 LD

Din 19

3 φR

CLK 18

MCU

4 φV

ENB 17

+3V

LOW–PASS

FILTER

5 VPD

6 PDout

7

GND

OUTPUT A 16

15

OUTPUT B

VDD 14

GENERAL–PURPOSE

DIGITAL OUTPUT

+3 V

8

Rx

9

NC TEST 1

TEST 2 13 NC

VCC 12

Q1

NOTE 2

10 fin

fin 11

1000 pF

UHF

VCO

BUFFER

UHF OUTPUT

NOTES:

1. When used, the φR and φV outputs are fed to an external combiner/loop filter. See the Phase–

Locked Loop — Low–Pass Filter Design page for additional information.

2. Transistor Q1 is required only if the standby feature is needed. Q1 permits the bipolar section

of the device to be shut down via use of the general–purpose digital pin, OUTPUT B. If the stand-

by feature is not needed, tie Pin 12 directly to the power supply.

3. For optimum performance, bypass the VCC, VDD, and VPD pins to GND with low–inductance ca-

pacitors.

4. The R counter is programmed for a divide value = REFin / fR. Typically, fR is the tuning resolution

required for the VCO. Also, the VCO frequency divided by fR = NT = N x 64 + A; this determines

the values (N, A) that must be programmed into the N and A counters, respectively.

Figure 21. Example Application

DEVICE #1

OUTPUT A

Din

CLK ENB (DATA OUT)

DEVICE #2

OUTPUT A

Din

CLK ENB (DATA OUT)

CMOS

MCU

OPTIONAL

NOTE: See related Figures 23, 24, and 25.

Figure 22. Cascading Two Devices

MC145202

20

MOTOROLA

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