参数资料
型号: SM320VC33HFGM150
厂商: TEXAS INSTRUMENTS INC
元件分类: 数字信号处理
英文描述: 32-BIT, 75 MHz, OTHER DSP, CQFP164
封装: NCTB, CERAMIC, MO-113AA, QFP-164
文件页数: 5/56页
文件大小: 669K
代理商: SM320VC33HFGM150
SM320VC33, SMJ320VC33
DIGITAL SIGNAL PROCESSOR
SGUS034E - FEBRUARY 2001 - REVISED OCTOBER 2002
13
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251-1443
PLL and clock oscillator control (continued)
Typical crystals in the 8-30 MHz range have a series resistance of 25
, which increases below 8 MHz. To
maintain proper filtering and phase relationships, Rd and Zout of the oscillator circuit should be 10x-40x that of
the crystal. A series compensation resistor (Rd), shown in Figure 5, is recommended when using lower
frequency crystals. The XOUT output, the square wave inverse of XIN, is then filtered by the XOUT output
impedance, C1 load capacitor, and Rd (if present). The crystal and C2 input load capacitor then refilters this
signal, resulting in a XIN signal that is 75-85% of the oscillator supply voltage.
NOTE: Some ceramic resonators are available in a low-cost, three-terminal package that includes C1 and C2
internally. Typically, ceramic resonators do not provide the frequency accuracy of crystals.
NOTE: Better PLL stability can be achieved using the optional power supply isolation circuit shown in Figure 5.
A similar filter can be used to isolate the PLLVSS, as shown in Figure 6. PLLVDD can also be directly connected
to CVDD.
Table 3. Typical Crystal Circuit Loading
FREQUENCY (MHz)
Rd (
)
C1 (pF)
C2 (pF)
CL (pF)
RL (
)
2
4.7k
18
12
200
5
2.2k
18
12
60
10
470
15
12
30
15
0
15
12
25
20
0
9
10
25
CL and RL are typical internal series load capacitance and resistance of the crystal.
XOUT
XIN
C1
C2
Crystal
EXTCLK
Rd
PLLVSS
CVDD
100
PLLVDD
0.1
F
0.01
F
Figure 5. Self-Oscillation Mode
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