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參數(shù)資料
| 型號： | 73M1903C-IM/F |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQCC32 |
| 封裝： | LEAD FREE, QFN-32 |
| 文件頁數(shù)： | 39/48頁 |
| 文件大小： | 487K |
| 代理商： | 73M1903C-IM/F |
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73M1903C Data Sheet
DS_1903C_033
44
Rev. 5.0
Example 2: Fs = 8.0 kHz or Fvco = 2 x 2304 x 8 kHz = 36.864 MHz, Fref = 2.304 MHz.
Ndvsr = Integer [Fvco/Fref] = 16 = 10h;
Nrst= 1-1 = 0 from Fvco/Fref = 16/1;
Nseq = {x,x,x,x,x,x,x,x} = xxh.
Example 3: Fs = 9.6 kHz or Fvco = 2 x 2304 x 9.6 kHz =44.2368 MHz, Fref = 2.4576 MHz.
Ndvsr = Integer [Fvco/Fref] = 18 = 16h;
Nrst= 1-1 = 0 from Fvco/Fref = 18/1;
Nseq = {x,x,x,x,x,x,x,x} = xxh.
Example 4: Fs = 16.0 kHz or Fvco = 2 x 2304 x 16.0 kHz =73.728 MHz, Fref = 3.072 MHz.
Ndvsr = Integer [Fvco/Fref] = 24 =18h;
Nrst= 1-1 = 0 from Fvco/Fref = 24/1;
Nseq = {x,x,x,x,x,x,x,x} = xxh.
It is important to note that in general the NCO based feedback divider will generate a fixed jitter pattern
whose frequency components are at Fref/Accreset2 and its integer multiples. The overall jitter frequency
will be a nonlinear combination of jitters from both pre-scaler and PLL NCO. The fundamental frequency
component of this jitter is at Fref/Prst/Nrst. The PLL parameters should be selected to remove this jitter.
Three separate controls are provided to fine-tune the PLL as shown in the following sections.
To ensure quick settling of PLL, a feature was designed into the 73M1903C where Ichp is kept at a higher
value until LockDet becomes active or Frcvco bit is set to 1, whichever occurs first. Thus, PLL is
guaranteed to have the settling time of less than one Frame Synch period after a new set of NCO
parameters had been written to the appropriate registers. The serial port register writes for a particular
sample rate must be done in sequence starting from register 08h ending in register 0Dh. 0Dh register
must be the last one to be written to. This is followed by a write to the next register in sequence (0Eh) to
force the transition of Sysclk from Xtal to Pllclk.
Upon the system reset, the system clock is reset to Fxtal/9. The system clock will remain at Fxtal/9 until
the Host forces the transition, but no sooner the second Frame Synch period after the write to 0Dh.
When this happens, the system clock will transition to PLLclk without any glitches thru a specially
designed deglitch MUX.
Examples of NCO Settings
Example 1
Crystal Frequency = 24.576 MHz; Desired Sampling Rate, Fs = 13.714 kHz(=2.4 kHz x 10/7 x 4)
Step 1. First compute the required VCO frequency, Fvco, corresponding to
Fs = 2.4 kHz x 10/7 x 4 = 13.714 kHz, or
Fvco = 2 x 2304 x Fs = 2 x 2304 x 2.4 kHz x 10/7 x 4 = 63.19543 MHz.
Step 2. Express the required VCO frequency divided by the Crystal Frequency as a ratio of two integers.
This is initially given by:
MHz
Fxtal
Fvco
576
.
24
4
10/7
2.4kHz
2304
2
/
=
.
After a few rounds of simplification this ratio reduces to:
18
1
7
1
Dnco2
Nnco2
Dnco1
Nnco1
)
1
18
(
)
7
1
(
7
18
/
=
=
Fxtal
Fvco
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