ICS1531 Datasheet, PDF (44/76 Pages) Integrated Circuit Systems – Triple 8-bit MSPS A/D Converters with Line-Locked Clock Generator

ICS1531 Data Sheet - Preliminary
Chapter 6 Register Set
6.5.27 Register 2Ah: MCLK-SSOE
The MCLK-SSOE (MCLK Spread Spectrum Output Enable) Register is used to control the gain of the
MCLK PFD and spread spectrum. (To select values, see Section 7.3, “Programming Spread Spectrum”.)
Table 6-27. MCLK-SSOE Register
Bit
Bit Name
Bit Definition
Ac- Spec. Re-
cess Func. set
2A:7- MCLK_SS [1-0]
2A:6
MCLK Spread-Spectrum (Gain Select) [1-0].
• 0 = The gain is 1.
• 1 = The gain is 2.
• 2 = The gain is 4.
• 3 = The gain is 8.
R/W D-MK
0
2A:5 Reserved
Reserved.
• See Section 6.1, “Reserved Bits”.
• This bit can be programmed to ‘0’.
–
–
0
2A:4-
2A:2
MCLK_PFD [2-0]
MCLK Phase/Frequency Detector (Gain Select) [2-0].
These bits determine the gain for the MCLK
Phase/Frequency Detector.
• 0 = The gain is 1.
• 1 = The gain is 2.
• 2 = The gain is 4.
• 3 = The gain is 8.
• 4 = The gain is 16, and so forth.
R/W D-MK
0
2A:1- MCLK_OSD
2A:0 [1-0]
MCLK Output Scaler Divider [1-0].
R/W D-MK
0
These bits determine the value for dividing the MCLK output
scaler.
• 0 = Division is by 1.
• 1 = Division is by 2.
• 2 = Division is by 4.
• 3 = Division is by 8.
6.5.28 Register 2Bh: MCLK-OE
The MCLK-OE (MCLK Output Enable) Register is used to enable the MCLK output and spread-spectrum
functionality. (To select values, see Section 7.3, “Programming Spread Spectrum”.)
Table 6-28. MCLK-OE Register
Bit
Bit Name
Bit Definition
2B:7-
2B:2
2B:1
2B:0
Reserved
MCLK_SSENB
MCLK_OE
Reserved.
• See Section 6.1, “Reserved Bits”.
• These bits can be programmed to ‘0’.
MCLK Spread-Spectrum Enable.
• 0 = Disable MCLK spread-spectrum functionality.
• 1 = Enable MCLK spread-spectrum functionality.
MCLK Output Enable.
• 0 = Disable MCLK output.
• 1 = Enable MCLK output.
Ac- Spec. Re-
cess Func. set
–
–
0
R/W
–
0
R/W
–
0
ICS1531 Rev N 12/1/99
Copyright © 1999, Integrated Circuit Systems, Inc.
All rights reserved.
44
December, 1999