MC145152DW2R2 Freescale Semiconductor, MC145152DW2R2 Datasheet - Page 22

• Manufacturer Part Number: MC145152DW2R2
• Description: IC PAR-IN PLL FREQ SYNTH 28-SOIC
• Manufacturer: Freescale Semiconductor
• Type: PLL Clock/Frequency Synthesizerr

Specifications of MC145152DW2R2

• Pll: Yes
• Input: Clock
• Output: CMOS
• Number Of Circuits: 1
• Ratio - Input:output: 1:1
• Differential - Input:output: No/No
• Frequency - Max: 25MHz
• Divider/multiplier: Yes/No
• Voltage - Supply: 3 V ~ 9 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-SOIC (7.5mm Width)
• Frequency-max: 25MHz
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: MC145152DW2TR

Design Considerations
For the maximum frequency into the prescaler (f
that:
A sometimes useful simplification in the programming code can be achieved by choosing the values for P
of 8, 16, 32, or 64. For these cases, the desired value of N
code to the ÷ N and ÷ A counters treated in the following manner:
By using the two devices, several dual-modulus values are achievable.
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1. f
2. The period of f
1. Assume the ÷ A counter contains “a” bits where 2
2. Always program all higher order ÷ A counter bits above “a” to 0.
3. Assume the ÷ N counter and the ÷ A counter (with all the higher order bits above “a” ignored)
counters).
a) Propagation delay through the dual-modulus prescaler.
b) Prescaler setup or release time relative to its MC signal.
c) Propagation time from f
combined into a single binary counter of n + a bits in length (n = number of divider stages in the
÷ N counter). The MSB of this “hypothetical” counter is to correspond to the MSB of ÷ N and the
LSB is to correspond to the LSB of ÷ A. The system divide value, N
of N
VCOmax
T
in binary is used to program the “new” n + a bit counter.
divided by P may not exceed the frequency capability of f
VCO
divided by P must be greater than the sum of the times:
MC145151-2 and MC145152-2 Technical Data, Rev. 5
in
to the MC output for the frequency synthesizer device.
VCOmax
T
), the value used for P must be large enough such
results when N
a
≥ P.
T
in binary is used as the program
in
T
, now results when the value
(input to the ÷ N and ÷ A
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