MC145158DW2R2 Freescale Semiconductor, MC145158DW2R2 Datasheet - Page 22

• Manufacturer Part Number: MC145158DW2R2
• Description: IC SER-IN PLL FREQ SYNTH 16-SOIC
• Manufacturer: Freescale Semiconductor
• Type: PLL Clock/Frequency Synthesizerr

Specifications of MC145158DW2R2

• Pll: Yes
• Input: Clock
• Output: Clock
• 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: 16-SOIC (0.300", 7.5mm Width)
• Frequency-max: 25MHz
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: MC145158DW2TR

Method of Measurement”, Proc. IEEE, Vol. 57, No. 2 Feb.,
1969.
Control”, Electro–Technology , June, 1969.
Design , May, 1966.
OVERVIEW
lished as a method of achieving high performance frequency
synthesizer operation at high frequencies. Basically, the
approach allows relatively low–frequency programmable
counters to be used as high–frequency programmable
counters with speed capability of several hundred MHz. This
is possible without the sacrifice in system resolution and per-
formance that results if a fixed (single–modulus) divider is
used for the prescaler.
must be uniquely configured. Special control logic is neces-
sary to select the divide value P or P + 1 in the prescaler for
the required amount of time (see modulus control definition).
Motorola’s dual–modulus frequency synthesizers contain
this feature and can be used with a variety of dual–modulus
prescalers to allow speed, complexity and cost to be tailored
to the system requirements. Prescalers having P, P + 1 di-
vide values in the range of 3/ 4 to 128/ 129 can be con-
trolled by most Motorola frequency synthesizers.
use with the MC145152–2, MC145156–2, or MC145158–2
are:
MC145151–2 through MC145158–2
22
MC12009
MC12011
MC12013
MC12015
MC12016
MC12017
MC12018
MC12028A
MC12052A
MC12054A
Technical Note TN–24, Statek Corp.
Technical Note TN–7, Statek Corp.
E. Hafner, “The Piezoelectric Crystal Unit – Definitions and
D. Kemper, L. Rosine, “Quartz Crystals for Frequency
P. J. Ottowitz, “A Guide to Crystal Selection”, Electronic
The technique of dual–modulus prescaling is well estab-
In dual–modulus prescaling, the lower speed counters
Several dual–modulus prescaler approaches suitable for
DUAL–MODULUS PRESCALING
RECOMMENDED READING
64/65 or
64/65 or
32/33 or
128/ 129
NOTE: Motorola cannot recommend one supplier over another and in no way suggests
32/ 33
40/ 41
64/ 65
10/ 11
5/ 6
8/ 9
Motorola — Internet Address http://motorola.com
128/129
128/129
64/65
that this is a complete listing of crystal manufacturers.
Freescale Semiconductor, Inc.
For More Information On This Product,
Table 1. Partial List of Crystal Manufacturers
440 MHz
500 MHz
500 MHz
225 MHz
225 MHz
225 MHz
520 MHz
1.1 GHz
1.1 GHz
2.0 GHz
Go to: www.freescale.com
United States Crystal Corp.
Crystek Crystal
Fox Electronics
Statek Corp.
DESIGN GUIDELINES
the application:
number programmed into the
the two selectable divide ratios available in the dual–modu-
lus prescalers. To have a range of N T values in sequence,
the A counter is programmed from zero through P – 1 for a
particular value N in the N counter. N is then incremented to
N + 1 and the
achieved for N T . These values are a function of P and the
size of the
N min P – 1. Then N Tmin = (P – 1) P + A or (P – 1) P since A
is free to assume the value of 0.
lus prescaler output must go from low to high after each
group of P or P + 1 input cycles. The prescaler should divide
by P when its modulus control line is high and by P + 1 when
its MC is low.
the value used for P must be large enough such that:
code can be achieved by choosing the values for P of 8, 16,
32, or 64. For these cases, the desired value of N T results
when N T in binary is used as the program code to the N and
A counters treated in the following manner:
The system total divide value, N total (N T ) will be dictated by
N is the number programmed into the N counter, A is the
There are minimum and maximum values that can be
The constraint N A always applies. If A max = P – 1, then
To maximize system frequency capability, the dual–modu-
For the maximum frequency into the prescaler (f VCOmax ),
1. f VCOmax divided by P may not exceed the frequency
2. The period of f VCO divided by P must be greater than
A sometimes useful simplification in the programming
1. Assume the
2. Always program all higher order
N T =
capability of f in (input to the
the sum of the times:
a. Propagation delay through the dual–modulus pre-
b. Prescaler setup or release time relative to its MC
c. Propagation time from f in to the MC output for the
“a” to 0.
scaler.
signal.
frequency synthesizer device.
(Search for resonators)
frequency into the phase detector
N and
frequency into the prescaler
A is sequenced from 0 through P – 1 again.
N Tmax = N max P + A max
A counter contains “a” bits where 2 a
A counters.
A counter, P and P + 1 are
N and
A counter bits above
A counters).
= N P + A
MOTOROLA
P.