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RF2051

DS140110

7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical

support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.

General Programming Information

Serial Interface

All on-chip registers in the RF2051 are programmed using a 3-wire serial bus which supports both write and read operations.

Synthesizer programming, device configuration and control are achieved through a mixture of hardware and software controls.

Certain functions and operations require the use of hardware controls via the ENBL, MODE, and RESETB pins in addition to

programming via the serial bus.

Serial Data Timing Characteristics

Parameter

Description

Time

t1

Reset delay

>5ns

t2

Programming setup time

>5ns

t3

Programming hold time

>5ns

t4

ENX setup time

>5ns

t5

ENX hold time

>5ns

t6

Data setup time

>5ns

t7

Data hold time

>5ns

t8

ENBL setup time

>0ns

t9

ENBL hold time

>0ns

MCU

ENX

SCLK

SDATA

ENBL

RESETB

MODE

3-wire bus

Hardware

Controls

RF2051

RESETB

ENX

SCLK

SDATA

ENBL

X

Reset

chip

Initial programming of device

Programming

updates

X

X

X

X

X

X

X

t1

t2

t3

t4

t5

t8

t6

t7

t9