FS7140-01 / FS7140-01g / FS7145 Programmable Phase-Locked Loop Clock Generator
6.0 Programming Information
All register bits are cleared to zero on power-up. All register
bits may be read back as written.
Data Sheet
Table 3: FS7140 Register Map
ADDRESS
BYTE 7
BIT 7
RESERVED
(Bit 63)
Must be set to “0”
BIT 6
RESERVED
(Bit 62)
Must be set to “0”
BIT 5
RESERVED
(Bit 61)
Must be set to “0”
BIT 4
RESERVED
(Bit 60)
Must be set to “0”
BIT 3
RESERVED
(Bit 59)
Must be set to “0”
BIT 2
RESERVED
(Bit 58)
Must be set to “0”
BIT 1
RESERVED
(Bit 57)
Must be set to “0”
BIT 0
RESERVED
(Bit 56)
Must be set to “0”
RESERVED
BYTE 6
(Bit 55)
Must be set to “0”
RESERVED
(Bit 54)
Must be set to “0”
SHUT2
(Bit 53)
0 = Normal
1 = Powered Down
RESERVED
(Bit 52)
Must be set to “0”
RESERVED
(Bit 51)
Must be set to “0”
RESERVED
(Bit 50)
Must be set to “0”
RESERVED
(Bit 49)
Must be set to “0”
RESERVED
(Bit 48)
Must be set to “0”
RESERVED
BYTE 5
(Bit 47)
Must be set to “0”
LC
(Bit 46)
Loop Filter Cap
Select
LR[1]
(Bit 45)
LR[0]
(Bit 44)
RESERVED
(Bit 43)
Must be set to “0”
RESERVED
(Bit 42)
Must be set to “0”
CP[1]
(Bit 41)
CP[0]
(Bit 40)
Loop Filter Resistor Select
Charge Pump Current Select
CMOS
BYTE 4
(Bit 39)
0 = PECL
1 = CMOS
FBKDSRC
(Bit 38)
0 = VCO Output
1 = Post Divider
Output
FBKDIV[13]
(Bit 37)
8192
FBKDIV[12]
(Bit 36)
4096
FBKDIV[11]
(Bit 35)
2048
FBKDIV[10]
(Bit 34)
1024
FBKDIV[9]
(Bit 33)
512
FBKDIV[8]
(Bit 32)
256
See Section 4.1.2 for disallowed FBKDIV values
FBKDIV[7]
BYTE 3
(Bit 31)
128
FBKDIV[6]
(Bit 30)
64
FBKDIV[5]
(Bit 29)
32
FBKDIV[4]
(Bit 28)
16
FBKDIV[3]
(Bit 27)
8
FBKDIV[2]
(Bit 26)
4
FBKDIV[1]
(Bit 25)
2
FBKDIV[0]
(Bit 24)
1
See Section 4.1.2 for disallowed FBKDIV values
POST2[3]
BYTE 2
(Bit 23)
POST2[2]
(Bit 22)
POST2[1]
(Bit 21)
POST2[0]
(Bit 20)
POST1[3]
(Bit 19)
POST1[2]
(Bit 18)
POST1[1]
(Bit 17)
POST1[0]
(Bit 16)
Modulus = N+1 (N=0 to 11)
See Table 8
Modulus = N+1 (N=0 to 11)
See Table 8
POST3[1]
BYTE 1
(Bit 15)
POST3[0]
(Bit 14)
SHUT1
(Bit 13)
0 = Normal
1 = Powered Down
REFDSRC
(Bit 12)
0 = Crystal Oscillator
1 = REF Pin
REFDIV[11]
(Bit 11)
2048
REFDIV[10]
(Bit 10)
1024
REFDIV[9]
(Bit 9)
512
REFDIV[8]
(Bit 8)
256
Modulus = 1, 2, 4, or 8
See Table 8
REFDIV[7]
BYTE 0
(Bit 7)
128
REFDIV[6]
(Bit 6)
64
REFDIV[5]
(Bit 5)
32
REFDIV[4]
(Bit 4)
16
REFDIV[3]
(Bit 3)
8
REFDIV[2]
(Bit 2)
4
REFDIV[1]
(Bit 1)
2
REFDIV[0]
(Bit 0)
1
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