TRF2050 datasheet(21/34 Pages) TI

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TRF2050

LOW-VOLTAGE 1.2-GHz FRACTIONAL-N/INTEGER-N SYNTHESIZER

SLWS030D– JUNE 1996 – REVISED OCTOBER 1998

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

PRINCIPLES OF OPERATION

Table 3. Extended Performance Mode Function Table

SYMBOL

BITS

SAME AS

SA7025

MODE

FUNCTION

ACP

Auxiliary charge polarity:

0 = positive

1 = negative

Yes

Binary acceleration factor for integral charge pump current

Yes

Binary acceleration factor for proportional charge pump current

Yes

Binary current setting factor for main charge pumps

Auxiliary divider enable flag:

0 = disabled

1 = enabled

Yes

Main divider enable flag:

0 = disabled

1 = enabled

FMOD

Fraction accumulator modulus

Speed-up mode duration (See Table 9)

MCP

Main charge pump polarity:

0 = positive

1 = negative

Mode select

01 = Extended Performance Mode

Overall main divider integer division ratio (NM)

Yes

Auxiliary divider ratio

Fractional-N increment

Yes

Reference divider ratio

Yes

Auxiliary prescaler select:

0 = divide by 4

1 = divide by 1

Yes

Reference select for auxiliary phase detector

Yes

Reference select for main phase detector

Yes

Test mode connection of internal signals to the LOCK terminal:

00 = ACCU overflow

01 = Auxiliary divider

10 = Main divider

11 = Reference divider

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