CS2000CP-CZZ Cirrus Logic Inc, CS2000CP-CZZ Datasheet - Page 33

• Manufacturer Part Number: CS2000CP-CZZ
• Description: IC General Purpose PLL Crystal
• Manufacturer: Cirrus Logic Inc
• Type: Fractional N Synthesizerr

Specifications of CS2000CP-CZZ

• Pll: Yes
• Input: Clock
• Output: Clock
• Number Of Circuits: 1
• Ratio - Input:output: 2:2
• Differential - Input:output: No/No
• Frequency - Max: 75MHz
• Divider/multiplier: Yes/Yes
• Voltage - Supply: 3.1 V ~ 3.5 V
• Operating Temperature: -10°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 10-MSOP, Micro10™, 10-uMAX, 10-uSOP
• Frequency-max: 75MHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 598-1572 - KIT EVAL PROTOTYPING CS2300-CP598-1571 - KIT EVAL PROTOTYPING CS2000-CP598-1493 - BOARD EVAL GEN PURPOSE PLL DC598-1492 - BOARD EVAL GEN PURPOSE PLL DC598-1490 - BOARD EVAL GEN PURPOSE PLL
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 598-1748; CS2000CP-CZZ

DS761PP1
9. CALCULATING THE USER DEFINED RATIO
Note:
Most calculators do not interpret the fixed point binary representation which the CS2000 uses to define the output
to input clock ratio (see
generate a binary or hex value which can be written to the Ratio
9.1
9.2
The software for use with the evaluation kit has built in tools to aid in calculating and converting the User
Defined Ratio. This section is for those who are not interested in the software or who are developing their
systems without the aid of the evaluation kit.
High Resolution 12.20 Format
To calculate the User Defined Ratio (R
cy by the given input clock (CLK_IN or RefClk). Then multiply the desired ratio by the scaling factor of 2
to get the scaled decimal representation; then use the decimal to binary/hex conversion function on a cal-
culator and write to the register. A few examples have been provided in
High Multiplication 20.12 Format
To calculate the User Defined Ratio (R
cy by the given input clock (CLK_IN). Then multiply the desired ratio by the scaling factor of 2
scaled decimal representation; then use the decimal to binary/hex conversion function on a calculator and
write to the register. A few examples have been provided in
Desired Output to Input Clock Ratio
Desired Output to Input Clock Ratio
11.2896 MHz/59.97 Hz =188254.127...
(output clock/input clock)
(output clock/input clock)
12.288 MHz/10 MHz=1.2288
12.288 MHz/60 Hz=204,800
11.2896 MHz/44.1 kHz=256
Section 5.3.1 on page
Table 5. Example 12.20 R-Values
Table 6. Example 20.12 R-Values
UD
UD
17); However, with a simple conversion we can use these tools to
) to store in the register(s), divide the desired output clock frequen-
) to store in the register(s), divide the desired output clock frequen-
(output clock/input clock)
(output clock/input clock)
Representation =
Representation =
Scaled Decimal
Scaled Decimal
268435456
838860800
771088904
1288490
0-3
registers.
Table
6.
•
•
2
2
Table
20
12
5.
Hex Representation of
Hex Representation of
00 13 A9 2A
2D F5 E2 08
Binary R
10 00 00 00
Binary R
32 00 00 00
CS2000-CP
12
UD
UD
to get the
33
20