SA8027 datasheet(3/22 Pages) PHILIPS

3 / 22 page

Philips Semiconductors

Product data

SA8027

2.5 GHz low voltage, low power

RF fractional-N/IF integer frequency synthesizer

2001 Aug 21

VDD

SR02357

CLOCK

DATA

STROBE

RF/MAINin+

RF/MAINin–

REFin+

REFin–

IF/AUXin

TEST

LOAD SIGNALS

ADDRESS DECODER

2–BIT SHIFT

22–BIT SHIFT

CONTROL

LATCH

MAIN DIVIDER

REFERENCE

DIVIDER

22 2 2

LATCH

AMP

LATCH

AUX DIVIDER

PHASE

DETECTOR

PHASE

DETECTOR

FRAC

COMP

PUMP

BIAS

PUMP

CURRENT

SETTING

VDDCP

GND

7, 10

GNDCP

RSET

PHP

PHI

LOCK

PHA

PON

LOCK

SELECT

Figure 3.

Block Diagram (TSSOP20)

TSSOP20 PIN DESCRIPTION

SYMBOL

DESCRIPTION

LOCK

Lock detect output

TEST

Test (should be either grounded or

connected to VDD)

VDD

Digital supply

GND

Digital ground

RFin+

RF input to main divider

RFin–

RF input to main divider

GNDCP

Charge pump ground

PHP

Main normal charge pump

PHI

Main integral charge pump

GNDCP

Charge pump ground

SYMBOL

DESCRIPTION

PHA

Auxiliary charge pump output

AUXin

Input to auxiliary divider

VDDCP

Charge pump supply voltage

RSET

External resistor from this pin to ground

sets the charge pump current

REFin–

Reference input

REFin+

Reference input

CLOCK

Programming bus clock input

DATA

Programming bus data input

STROBE

Programming bus enable input

PON

Power down control

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