ICS1531 Datasheet, PDF (35/76 Pages) Integrated Circuit Systems – Triple 8-bit MSPS A/D Converters with Line-Locked Clock Generator

ICS1531 Data Sheet - Preliminary
Chapter 6 Register Set
6.5.9 Register 08h: Internal Filter
The Internal Filter Register is used to select values for the internal loop filter.
Table 6-12. Internal Filter Register
Bit Bit Name
08:7 Shunt_Sel
08:6- Res_Sel [2-0]
08:4
Bit Definition
Ac- Spec. Re-
cess Func. set
Shunt (Capacitor) Select.
R/W
–
1
This bit selects the size of the internal filter’s shunt capacitor.
• 0 = Selects an alternate-size shunt capacitor
• 1 = Select the default-size shunt capacitor
Resistor Select [2-0].
R/W
–
7
These bits are used to select the size of the internal filter’s
resistor as follows:
Resistor value ≈ {(Value of Res_Sel [2-0] bits) × 4kΩ} + 3kΩ
08:3- Cap_Sel [2-0]
Capacitor Select [2-0].
R/W
–
7
08:1
These bits are used to select the size of the internal filter’s
capacitor as follows:
Capacitor value: ≈ {(Value of Cap_Sel [2-0] bits) + 1} × 236 pF
08:0 Fil_Sel
(Loop) Filter Select.
This bit selects the type of loop filter.
• 0 = The loop filter is external.
• 1 = The loop filter is internal (default).
R/W
–
1
6.5.10 Register 09h: Reserved
This register is reserved. (See Section 6.1, “Reserved Bits”.)
6.5.11 Register 0Ah: Pixel PLL/DPA Reset
The Pixel PLL/DPA Reset Register is used to reset the pixel PLL and DPA circuits.
Table 6-13. Register
Bit
Bit Name
Bit Definition
0A:7- Pixel PLL Reset
0A:4 [3-0]
0A:3- DPA Reset [3-0]
0A:0
Pixel Phase-Locked Loop Reset [3-0].
Writing 5xh to these bits does the following:
• Resets the pixel phase-locked loop.
• Loads working Regs 01 to 03.
Dynamic Phase Adjust Reset [3-0].
Writing xAh to these bits does the following:
• Resets the Dynamic Phase Adjust.
• Loads working Reg 05.
Ac- Spec. Re-
cess Func. set
Write
–
N/A
Write
–
N/A
6.5.12 Register 0Bh-0Fh: Reserved
These registers are reserved. (See Section 6.1, “Reserved Bits”.)
ICS1531 Rev N 12/1/99
Copyright © 1999, Integrated Circuit Systems, Inc.
All rights reserved.
35
December, 1999