SA7025 Datasheet, PDF (4/22 Pages) NXP Semiconductors – Low-voltage 1GHz fractional-N synthesizer

Philips Semiconductors
1GHz low-voltage Fractional-N synthesizer
Product specification
SA7025
BLOCK DIAGRAM
CLOCK
DATA
STROBE
V_SS
RF_IN
RF_IN
TEST
V_CCP
REF_IN
AUX_IN
SERIAL INPUT + PROGRAM LATCHES
EM
EM+EA
EA
FB
2
NM2
PR
NM1
NM3
2
12
8
64/65/72
PRESCALER
MAIN DIVIDERS
FMOD
NF
3
FRACTIONAL
ACCUMULATOR
FB
PRESCALER
MODULUS
CONTROL
EM
NR
12
SM
2
REFERENCE DIVIDER
SA
2
EA
PA
NA
12
MAIN
PHASE
DETECTOR
MAIN
REFERENCE
SELECT
FRD
CN
8
2
CL
2
÷2 ÷2 ÷2
CK
4
AUXILIARY
REFERENCE
SELECT
AUXILIARY
2
PHASE
DETECTOR
NORMAL
OUTPUT
CHARGE
PUMP
SPEED-UP
OUTPUT
CHARGE
PUMP
INTEGRAL
OUTPUT
CHARGE
PUMP
AUXILIARY
OUTPUT
CHARGE
PUMP
1/4
PRESCALER
AUXILIARY DIVIDER
V_DD
RF
RN
PHP
PHI
RA
PHA
LOCK
V_DDA
Figure 2. Block Diagram
V_SSA
SR00601
1996 Aug 6
4