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参数资料
| 型号： | GMZAN3T |
| 厂商： | Electronic Theatre Controls, Inc. |
| 英文描述： | XGA ALALOG INTERFACE LCD MONITOR CONTROLLER |
| 中文描述： | ALALOG的XGA液晶显示器接口控制器 |
| 文件页数： | 14/53页 |
| 文件大小： | 556K |
| 代理商： | GMZAN3T |
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gmZAN3 Preliminary Data Sheet
C0523-DAT-01G
21
July 2003
Ge nes i s Microc hip Confid e n tia l
http:// w ww . g enesis-mic r ochip.com
minimum signal level of about 50-mV peak to peak to function correctly. The output of the comparator is
buffered and then distributed to the gmZAN3 circuits.
~ 2 Volts
3.3 Volts
250 mV peak to peak
to
1000 mV peak to peak
time
Figure 6.
Internal Oscillator Output
One of the design parameters that must be given some consideration is the value of the loading capacitors
combination of CL1 and CL2 and is calculated by Cload = ((CL1 * CL2) / (CL1 + CL2)) + Cshunt. The shunt
capacitance Cshunt is the effective capacitance between the XTAL and TCLK pins. For the gmZAN3 this is
approximately 9 pF. CL1 and CL2 are a parallel combination of the external loading capacitors (Cex), the
PCB board capacitance (Cpcb), the pin capacitance (Cpin), the pad capacitance (Cpad), and the ESD
protection capacitance (Cesd). The capacitances are symmetrical so that CL1 = CL2 = Cex + CPCB + Cpin +
Cpad + CESD. The correct value of Cex must be calculated based on the values of the load capacitances.
Approximate values are provided in Figure 7.
XTAL
TCLK
gmZAN3
111
110
Cex1
Cex2
Internal Oscillator
Cpcb
Cshunt
Cpcb
Cpin
Cpad
Cesd
Cpin
Cpad
Cesd
Vdda
CL1 = Cex1 + Cpcb + Cpin + Cpad + Cesd
CL2 = Cex1 + Cpcb + Cpin + Cpad + Cesd
Approximate values:
CPCB ~ 2 pF to 10 pF (layout dependent)
Cpin ~ 1.1 pF
Cpad ~ 1 pF
Cesd ~ 5.3 pF
Cshunt ~ 9 pF
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