TRF2050

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

SLWS030E– JUNE 1996 – REVISED OCTOBER 2000

2

POST OFFICE BOX 655303

Serial Control Shift Registers

Common Registers

EPM Registers

7025 Registers

Conversion and Selection‡

CLOCK

STROBE

Fraction

Accumulator

FMOD

5

NF

4

Fraction

Compensation

Control Lines

Compensation

Charge Pump

Phase

Detector

Proportional

Charge Pump

Reference

Divider

Integral

Charge Pump

4

CK

18

N

12

NR

Phase

Detector

Auxiliary

Charge Pump

Auxiliary

Divider

4/1

12

NA

PA

REFIN

AUXIN

RF

RN

PHI

LOCK/

TEST

RA

PHA

Main Divider

(N/N+1)

RFIN

RFIN

32/33

Prescaler

CL

2

CN

8

PHP

CL

2

CN

8

1 2 4 8

Select

Select

2

SM

2

SA

3

1

5

6

8

10

17

14

16

13

18

9

11

DATA

2

† Terminals 4, 7, 12, 15, and 20 are for supply voltage. Terminal 19 is for testing. These terminals are not shown.

‡ Conversion and selection block provides emulation of SA7025 64/65/72 triple-modulus prescaler operation using the TRF2050 32/33

dual-modulus prescaler.

†

EM+EA

EM

EA