SA9024 Ver la hoja de datos (PDF) - Philips Electronics

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SA9024

900 MHz transmit modulator and 1.3 GHz fractional–N synthesizer

Philips Electronics 

Philips Semiconductors

900 MHz transmit modulator and 1.3 GHz

fractional–N synthesizer

Objective specification

SA9024

Functional Description Main Channel Synthesizer

& Auxiliary Synthesizer

CLOCK

DATA

STROBE

PD1

INM1

INM2

PD1 + PD2

INR

PD2

INA

SERIAL INPUT + PROGRAM LATCHES

FB

1

NMAIN

16

MAIN DIVIDERS

FMOD

NF

FB

3

FRACTIONAL

ACCUMULATOR

PD1

NR

12

SM

2

REFERENCE DIVIDER

MAIN

PHASE

2

DETECTOR

MAIN

REFERENCE

SELECT

÷2 ÷2 ÷2

SA

2

PD2

NAUX

14

AUXILIARY

REFERENCE

SELECT

AUXILIARY

PHASE

DETECTOR

AUXILIARY DIVIDER

FDAC

8

FDAC

8

FDAC

8

NORMAL

OUTPUT

CHARGE

PUMP

SPEED-UP

OUTPUT

CHARGE

PUMP

INTEGRAL

OUTPUT

CHARGE

PUMP

AUXILIARY

OUTPUT

2

CHARGE

PUMP

RN

PHP

PHI

RN

PHA

LOCK

Figure 4. Synthesizer Block Diagram

SR01112

Serial Programming Input

The serial input is a 3-wire input (CLOCK, DATA, STROBE) used to

program all counter ratios, DACs, selection and enable bits. The

programming data is structured into 24-bit words; each word

includes 2 or 3 address bits. Figure [5] shows the timing diagram of

the serial input. When STROBE = L, the clock driver is enabled and

on positive edges of the CLOCK, the signal on DATA input is

clocked into a shift register. When STROBE = H, the clock is

disabled and the data in the shift register remains stable.

Depending on the 2 or 3 address bits, data is latched into different

working or temporary registers. In order to fully program the

synthesizer, 3 words must be sent: A, B and C. The D word

programs all other functions within the SA9024. Those functions are

1997 Aug 01

10

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