參數(shù)資料
型號： SA9025
廠商： NXP SEMICONDUCTORS
元件分類： 通信及網(wǎng)絡(luò)
英文描述： 900 MHz transmit modulator and 2.2 GHz fractional-N synthesizer
中文描述： SPECIALTY TELECOM CIRCUIT, PQFP48
封裝： 7 X 7 X 1.40 MM, PLASTIC, LQFP-48
文件頁數(shù)： 15/23頁
文件大?。?/td> 134K
代理商： SA9025
Philips Semiconductors
Objective specification
SA9025
900 MHz transmit modulator and 2.2 GHz
fractional–N synthesizer
1997 Aug 01
15
Data format
Format of programmed data
LAST IN
MSB
SERIAL PROGRAMMING FORMAT
FIRST IN LSB
p23
p22
p21
p20
../..
../..
p1
p0
A word, length 24 bits
Last in
MSB
LSB
First IN
Address
fmod
Fractional–N
Main Divider ratio– Nmain
Spare
0
0
Fmod
NF2
NF1
NF0
N15
N14
N13
N12
N11
N10
N9
N8
N7
N6
N5
N4
N3
N2
N1
N0
sk1
sk2
Default:
0
0
1
0
0
0
1
0
0
0
1
0
0
0
1
1
0
0
0
0
0
0
A word select
Fixed to 00.
Fractional Modulus select
FM 0=modulo 8, 1=modulo 5.
Fractional–N Increment
NF2..0 Fractional N Increment values 000 to 111.
N–Divider
N0..N15, Main divider values 512 to 65535 allowed for divider ratio.
B word, length 24 bits
ADDRESS
REFERENCE DIVIDER NREF
RSM
RSA
FRACTIONAL COMPENSATION DAC
0
1
R9
R8
R7
R6
R5
R4
R3
R2
R1
R0
RSM
1
RSM
0
RSA
1
RSA
0
Fdac
7
Fdac
6
Fdac
5
Fdac
4
Fdac
3
Fdac
2
Fdac
1
Fdac
0
Default:
0
0
0
1
0
1
0
0
0
1
0
0
0
0
x
x
x
x
x
x
x
x
B word select
Fixed to 01
R–Divider
R0..R9, Reference divider values 4 to 1023 allowed for divider ration.
Charge pump current
Ratio
CP1, CP0: Charge pump current ratio, see table of charge pump currents.
Main comparison
select
RSM
Comparison divider select for main phase detector.
Aux comparison select
RSA
Comparison divider select for auxiliary phase detector.
Fractional
Compensation
Fdac7..0, Fractional compensation charge pump current DAC, values 0 to 255. FDAC = 77 for best op MOD8.
C word, length 24 bits
ADDRESS
AUXILIARY DIVIDER NAUX
CP
LOCK
PD
SPARE
1
0
A13
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
CP1
CP0
LD1
LD0
PD1
PD2
PD3
LOD
Default
0
0
0
0
0
1
1
1
0
0
1
0
1
0
1
1
0
0
TX
EN
TX
EN
0
0
C word select
Fixed to 10
A–Divider
A0..A13, Auxiliary divider values 128 to 16384 allowed for divider ratio.
Charge pump current Ratio
CP1, CP0: Charge pump current ratio, see table fo charge pump currents.
Lock detect output
LD1 LD0
0 0
0 1
1 0
1 1
When a section is in power down mode, the lock indicator for that section is high.
Combined main, aux. & offset loop lock detect signal present at the LOCK pin.
Combined main and aux. lock detect signal present at the LOCK pin.
Main lock detect signal present at the LOCK pin.
Auxiliary loop lock detect signal present at the LOCK pin.
Power down
PD1=1: power to N–divider, reference divider, main charge pumps, PD1=0 to power down.
PD2=1: power to Aux divider, reference divider, Aux charge pump, PD2=0 to power down.
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