ICS1523 Datasheet, PDF (8/21 Pages) Integrated Circuit Systems – Video Clock Synthesizer with I2C Programmable Delay

ICS1523
Video Clock Synthesizer with I²C Programmable Delay
Section 5 Register Set Details
Register Conventions
0xY:Z = Register Index Y(hex), bit Z
0xY:Z~Q = Register Index Y(hex), bit Z to Q
Note 3- COAST - Charge Pump Enable/Disable
CP_Pol CPen
0x0:1~0
00
x1
10
Charge Pump Enabled If...
COAST (Pin 5) = 1
Always Enabled (Default)
COAST (Pin 5) = 0
The COAST input can be used to disable the charge
pump during the vertical blanking interval if the input
HSYNC input changes frequency during this time. The
charge pump is asynchronously disabled and
synchronously re-enabled on the second input HSYNC
after the disable signal goes invalid. This pin can be
connected to VSYNC or pulled to either rail if unused.
Note 4 - LOCK/REF Function
EnPLS -
0x0
bit 7~6
00
01
10
11
11
IN_SEL
0x7bit 7 LOCK/REF Output
-
0
-
PLL locked = 1 else 0
-
RESERVED
0 Post Schmitt trigger
HSYNC (pin 7) XOR
REF_Pol (0x0:2)
1
F_OSC / (OSC _DIV +2)
Note 5- CLK Output Divider
0x6 bit 7,6
00
01
10
11
CLK Divider
1 (default)
2
4
8
SSTL_3 CLK Freq. = Output Freq. / CLK Divider
Note 6 - ICP - Charge Pump Current
0x1
Bit 2~0
000
001
010
011
100
101
110
111
Charge Pump Current (µA)
1
2
4
8 (Typical Internal Filter Value)
16
32
64
Reserved
Increasing the charge pump current makes the loop
respond faster, raising the loop bandwidth. The typical
value when using the internal loop filter is 011.
Note 7 - VCO Divider
0x1:bit 5,4
00
01
10
11
VCO Divider
2 (default)
4
8
16
This is used to keep the VCO running at faster speeds
even when the output frequency is low.
VCO speed = Output Frequency * VCO Scaler
Note 8 - DPA Offset Ranges
0x5
bit 1-0
00
# of DPA Delay
Elements (d)
16
0x4 ^{Clock Range (MHz)}
bit 5-0
Max. (h)
Min Max
0F
48
160
01
32
1F
24
80
10
Reserved
11
64
3F
12
40
Using the DPA above 160 MHz is not recommended.
Set DPA_OS = 0 for speeds in excess of 160 MHz to
bypass the DPA.
MDS ICS1523 Z
8
Integrated Device Technology, Inc. Tech Support: www.idt.com/go/clockhelp
Revision 052407