fs7140 ON Semiconductor, fs7140 Datasheet - Page 13

• Manufacturer Part Number: fs7140
• Description: Programmable Phase- Locked Loop Clock Generator
• Manufacturer: ON Semiconductor

Table 9. DEVICE CONFIGURATION BITS
Table 10. MAIN LOOP TUNING BITS
Table 11. PLL DIVIDER CONTROL BITS
Table 12. SYNC CONTROL BITS (FS7145 only)
REFDSRC
FBKDSRC
SHUT1
SHUT2
CMOS
CP[1:0]
LR[1:0]
LC
REFDIV[11:0]
FBKDIV[13:0]
SYNCEN
SYNCPOL
Name
Name
Name
Name
Reference divider source
[0] = crystal oscillator / [1] = REF pin
Feedback divider source
[0] = VCO output / [1] = post divider output
Shutdown1
[0] = normal / [1] = powered down
Shutdown2
[0] = normal / [1] = powered down
CLKP/CLKN output mode
[0] = PECL output / [1] CMOS output
Charge pump current
[00]
[01]
[10]
[11]
Loop filter resistor select
[00]
[01]
[10]
[11]
Loop filter capacitor select
[0]
[1]
Reference divider (N
Feedback divider (N
Sync enable
[0] = disabled / [1] = enabled
Sync polarity
[0] = negative edge / [1] = positive edge
Description
Description
Description
Description
R
R
)
)
2.0 mA
4.5 mA
11.0 mA
22.5 mA
400 KW
133 KW
30 KW
12 KW
185 pF
500 pF
http://onsemi.com
13
Table 13. POST DIVIDER CONTROL BITS
POST1[3:0]
POST2[3:0]
POST3[1:0]
Name
Post divider #1 (N
[0000]
[0001]
[0010]
[0011]
[0100]
[0101]
[0110]
[0111]
[1000]
[1001]
[1010]
[1011]
[1100]
[1101]
[1110]
[1111]
Post divider #2 (N
[0000]
[0001]
[0010]
[0011]
[0100]
[0101]
[0110]
[0111]
[1000]
[1001]
[1010]
[1011]
[1100]
[1101]
[1110]
[1111]
Post divider #3 (N
[00]
[01]
[10]
[11]
Description
P1
P2
P3
) modulus
) modulus
) modulus
1
2
3
4
5
6
7
8
9
10
11
12
Do not use
1
2
3
4
5
6
7
8
9
10
11
12
Do not use
1
2
4
8