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| 型號(hào)： | P12611EJ1V0AN00 |
| 英文描述： | MCU CMOS 28 LD 20MHZ 8K FLASH, -40C to +85C, 28-SOIC 300mil, TUBE |
| 中文描述： | uPB1509GV 1 GHz的輸入除以2。 4。 8預(yù)分頻器集成電路便攜式無(wú)線電系統(tǒng) |
| 文件頁(yè)數(shù)： | 17/19頁(yè) |
| 文件大小： | 110K |
| 代理商： | P12611EJ1V0AN00 |
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11
Table 3-2. Adjustment of External Control Voltage for Divide Ratio by Connecting External Resistors
(T
A
=
40 to +85 °C, V
CC
= 2.2 to 5.5 V)
Parameter
Symbol
MIN.
MAX.
Unit
H level at
{
point
V
IH
V
CC
0.2
V
CC
+ 0.5
V
L level at
{
point
V
IL
0.2
V
CC
×
0.4
V
4. SYSTEM EXAMPLE
4.1 Calculation of Count Number and Step Frequency for Prescaler PLL
The response frequency of the on-chip PLL frequency synthesizer (f
synth
) in CMOS ICs such as the 17K Series is
around 100 MHz even the highest. Therefore, for use in the VHF to UHF bands, the prescaler PLL method should be
adopted in which the VCO oscillation frequency (f
VCO
) of the local output is divided by a fixed-ratio prescaler before
entering the frequency synthesizer. If this method is used, the count number can be expressed as follows since the
system’s step frequency (f
step
) is divide-ratio times the phase comparison frequency (f
r
) of the frequency synthesizer.
Therefore,
f
r
= f
P
f
VCO
= P
×
f
synth
f
xtal
R
P
×
N
=
= f
r
(Hz)
(Hz)
∴
step
f
xtal
R
f
VCO
P
×
N
=
=
=
f
step
P
f
synth
N
f
VCO
P
N
R
f
xtal
: Divide number of the prescaler
: N count number of the following-stage frequency synthesizer
: Reference count number of the following-stage frequency synthesizer
: Reference oscillation frequency
N
= f
f
step
×
f
xtal
f
step
VCO
R
= P
N count number of prescaler side
Reference count number of reference X’tal oscillator side
·················
······················
Relationship between divide number of the prescaler and count numbers of the
following-stage frequency synthesizer (Figure 4-1 case)
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