MK1574 Integrated Circuit System, MK1574 Datasheet - Page 5

• Manufacturer Part Number: MK1574
• Description: Frame Rate Communications PLL
• Manufacturer: Integrated Circuit System

MDS1574-01D
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose • CA • 95126 • [phone] www.icst.com
In the table on page 2 are the actual multipliers stored in the MK1574 ROM, which yield the exact values
shown for the output clocks.
A proper board layout is critical to the successful
use of the MK1574. In particular, the CAP1 and
CAP2 pins are very sensitive to noise and leakage
(CAP1 at pin 4 is the most sensitive). Traces
must be as short as possible and the capacitor
and resistor must be mounted next to the device
as shown to the right. The capacitor connected
between pins 3 and 5 is the power supply
decoupling capacitor.
The high frequency output clocks on may
benefit from a series 33 resistor connected
close to the pin (not shown).
Clock Multipliers/Accuracies
PC Board Layout
Loop Filter Constants
This table shows the constants K1 and K2 that are used with the equations on page 4 to calculate the
external loop filter components.
I C R O
C
Loop Filter Constants for MK1574-01
LOC K
Decode Address Loop Filter Constants
FS3:0 (Hex)
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
C
D
0
1
2
3
4
5
6
7
8
9
A
B
E
F
Reserved
Reserved
Reserved
Reserved
0.0430
0.0527
0.0444
0.0454
0.0533
0.0410
0.0508
0.0587
0.0365
0.0420
0.0516
0.0594
5
K1
cap
Frame Rate Communications PLL
resist.
Reserved
Reserved
Reserved
Reserved
G
K2
7.4
6.0
7.2
7.0
6.0
7.8
6.3
5.4
8.7
7.6
6.2
5.4
V
cap
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
G
=connect to VDD
=connect to GND
MK1574
Revision 011601