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參數(shù)資料
| 型號(hào)： | MPC97R73FA |
| 廠商： | MOTOROLA INC |
| 元件分類： | 時(shí)鐘及定時(shí) |
| 英文描述： | PLL BASED CLOCK DRIVER, 12 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PQFP52 |
| 封裝： | LQFP-52 |
| 文件頁數(shù)： | 20/20頁 |
| 文件大?。?/td> | 252K |
| 代理商： | MPC97R73FA |
MPC97R73
TIMING SOLUTIONS
9
MOTOROLA
APPLICATIONS INFORMATION
MPC97R73 Configurations
Configuring the MPC97R73 amounts to properly
configuring the internal dividers to produce the desired output
frequencies. The output frequency can be represented by
this formula:
÷VCO_SEL
÷M
÷N
fREF
fOUT
fOUT = fREF M ÷ N
PLL
where fREF is the reference frequency of the selected input
clock source (CCLKO, CCLK1 or PCLK), M is the PLL
feedback divider and N is a output divider. The PLL feedback
divider is configured by the FSEL_FB[2:0] and the output
dividers are individually configured for each output bank by
the FSEL_A[1:0], FSEL_B[1:0] and FSEL_C[1:0] inputs.
The reference frequency fREF and the selection of the
feedback-divider M is limited by the specified VCO frequency
range. fREF and M must be configured to match the VCO
frequency range of 200 to 4801 MHz (VCC=3.3V) in order to
achieve stable PLL operation:
fVCO,MIN ≤ (fREF VCO_SEL M) ≤ fVCO,MAX
The PLL post-divider VCO_SEL is either a divide-by-one
or a divide-by-two and can be used to situate the VCO into
the specified frequency range. This divider is controlled by
the VCO_SEL pin. VCO_SEL effectively extends the usable
input frequency range while it has no effect on the output to
reference frequency ratio.
The output frequency for each bank can be derived from
the VCO frequency and output divider:
fQA[0:3] = fVCO ÷ (VCO_SEL NA)
fQB[0:3] = fVCO ÷ (VCO_SEL NB)
fQC[0:3] = fVCO ÷ (VCO_SEL NC)
Table 13: MPC97R73 Divider
Divider
Function
VCO_SEL
Values
M
PLL feedback
FSEL FB[0 3]
÷1
4, 6, 8, 10, 12, 16
FSEL_FB[0:3]
÷2
8, 12, 16, 20, 24, 32
NA
Bank A Output Di-
id
FSEL A[0 1]
÷1
4, 6, 8, 12
vider FSEL_A[0:1]
÷2
8, 12, 16, 24
NB
Bank B Output Di-
id
FSEL B[0 1]
÷1
4, 6, 8, 10
vider FSEL_B[0:1]
÷2
8, 12, 16, 20
NC
Bank C Output Di-
id
FSEL C[0 1]
÷1
2, 4, 6, 8
vider FSEL_C[0:1]
÷2
4, 8, 12, 16
1. The VCO frequency range for 2.5V operation is specified from
200 to 400 MHz.
Table 13 shows the various PLL feedback and output
dividers and Figure 3.
and Figure 4.
display example
configurations for the MPC97R73:
Figure 3. Example Configuration
Figure 4. Example Configuration
MPC97R73
fref = 33.3 MHz
33.3 MHz
100 MHz
33.3 MHz (Feedback)
200 MHz
MPC97R73 example configuration (feedback of
QFB = 33.3 MHz, fVCO=400 MHz, VCO_SEL=÷1,
M=12, NA=12, NB=4, NC=2).
Frequency range
Min
Max
Input
16.6 MHz
40 MHz
QA outputs
16.6 MHz
40 MHz
QB outputs
50 MHz
120 MHz
QC outputs
100 MHz
200 MHz
CCLK0
VCO_SEL
FSEL_A[1:0]
FSEL_B[1:0]
FSEL_C[1:0]
FSEL_FB[2:0]
QA[3:0]
QB[3:0]
QC[3:0]
QFB
CCLK1
CCLK_SEL
FB_IN
1
11
00
101
MPC97R73
fref = 25 MHz
62.5 MHz
25 MHz (Feedback)
125 MHz
MPC97R73 example configuration (feedback of
QFB = 25 MHz, fVCO=250 MHz, VCO_SEL=÷1,
M=10, NA=4, NB=4, NC=2).
Frequency range
Min
Max
Input
20 MHz
48 MHz
QA outputs
50 MHz
120 MHz
QB outputs
50 MHz
120 MHz
QC outputs
100 MHz
200 MHz
CCLK0
VCO_SEL
FSEL_A[1:0]
FSEL_B[1:0]
FSEL_C[1:0]
FSEL_FB[2:0]
QA[3:0]
QB[3:0]
QC[3:0]
QFB
CCLK1
CCLK_SEL
FB_IN
1
00
011
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