MB15F76UV Просмотр технического описания (PDF) - Unspecified

Номер в каталоге

Компоненты Описание

производитель

MB15F76UV

ASSP Dual Serial Input PLL Frequency Synthesizer(Small Package)

Unspecified 

MB15F76UV

Aug. 2003

Edition 0.2

„ FUNCTIONAL DESCRIPTIONS

The divide ratio can be calculated using the following equation:

fVCO = {(P x N) + A} x 4 x fOSC ÷ R

fVCO: Output frequency of external voltage controlled oscillator (VCO)

P: Preset divide ratio of dual modulus prescaler (4 or 8 for IF-PLL, 16 or 32 for RF-PLL)

N: Preset divide ratio of binary 13-bit programmable counter (3 to 8191)

A: Preset divide ratio of binary 5-bit swallow counter (0≤ A ≤ 31, condition;A < N)

fOSC: Reference oscillation frequency

R: Preset divide ratio of binary 14-bit programmable reference counter (3 to 16,383)

Serial Data Input

Serial data is entered using three pins, Data pin, Clock pin, and LE pin. Programmable dividers of IF/RF-PLL

sections, programmable reference dividers of IF/RF-PLL sections are controlled individually.

Serial data of binary data is entered through Data pin.

On a rising edge of clock, one bit of serial data is transferred into the shift register. On a rising edge of load enable

signal , the data stored in the shift register is transferred to one of latch of them depending upon the control bit data

setting.

Table1. Control Bit

Control bit

CN1

CN2

0

0

1

0

0

1

1

1

Destination of serial data

The programmable reference counter for the IF-PLL.

The programmable reference counter for the RF-PLL.

The programmable counter and the swallow counter for the IF-PLL

The programmable counter and the swallow counter for the RF-PLL

Shift Register Configuration

Programmable Reference Counter

LSB

Data Flow

MSB

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23

C CTT RR RRR RRRR RR RRRCX X X X

N N 1 2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 S

12

CN1, 2

: Control bit

R1 to R14 : Divide ratio setting bits for the programmable reference counter (3 to 16,383)

T1, 2

: LD/fout output setting bit

CS

: Charge pump current select bit

X

: Dummy bits(Set "0" or "1")

NOTE: Data input with MSB first.

[Table. 1]

[Table. 2]

[Table. 3]

[Table. 8]

8

Share Link: