參數(shù)資料
型號: SM320VC33HFGM150
廠商: TEXAS INSTRUMENTS INC
元件分類: 數(shù)字信號處理
英文描述: 32-BIT, 75 MHz, OTHER DSP, CQFP164
封裝: NCTB, CERAMIC, MO-113AA, QFP-164
文件頁數(shù): 20/56頁
文件大?。?/td> 669K
代理商: SM320VC33HFGM150
SM320VC33, SMJ320VC33
DIGITAL SIGNAL PROCESSOR
SGUS034E - FEBRUARY 2001 - REVISED OCTOBER 2002
27
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251-1443
clock circuit timing
The following table defines the timing parameters for the clock circuit signals.
circuit parameters for on-chip crystal oscillator (see Figure 15)
PARAMETER
MIN
TYP
MAX
UNIT
VO
Oscillator internal supply voltage
CVDD
V
FO
Fundamental mode frequency range
1*
20*
MHz
Vbias
DC bias point (input threshold)
40*
50
60*
%VO
Rfbk
Feedback resistance
100*
300
500*
k
Rout
Small signal ac output impedance
250*
500
1000*
Vxoutac
The ac output voltage with test crystal
85
%VO
Vxinac
The ac input voltage with test crystal
85
%VO
Vxoutl
Vxin = Vxinh, Ixout = 0, FO=0 (logic input)
VSS - 0.1*
VSS + 0.3*
V
Vxouth
Vxin = Vxinl, Ixout = 0, FO=0 (logic input)
CVDD - 0.3*
CVDD + 0.1*
V
Vinl
When used for logic level input, oscillator enabled
-0.3*
0.2 x VO*
V
Vinh
When used for logic level input, oscillator enabled
0.8 x VO*
DVDD + 0.3*
V
Vxinh
When used for logic level input, oscillator disabled
0.7 x DVDD
DVDD + 0.3
V
Cxout
XOUT internal load capacitance
2*
3
5*
pF
Cxin
XIN internal load capacitance
2*
3
5*
pF
td(XIN-H1)
Delay time, XIN to H1 x1 and x0.5 modes
2
5.5
8
ns
Iinl
Input current, feedback enabled, Vil = 0
50*
A
Iinh
Input current, feedback enabled, Vil = Vih
-50*
A
* Not production tested
This circuit is intended for series resonant fundamental mode operation.
Signal amplitude is dependent on the crystal and load used.
XOUT
XIN
C1
C2
Crystal
Rfbk
Rd
VO
CXIN
CXOUT
ROUT
To internal
clock generator
NOTE A: See Table 3 for value of Rd.
Figure 15. On-Chip Oscillator Circuit
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