參數(shù)資料
型號： UPD4990AC-A
元件分類： 時鐘/數(shù)據(jù)恢復(fù)及定時提取
英文描述： 0 TIMER(S), REAL TIME CLOCK, PDIP14
封裝： DIP-14
文件頁數(shù)： 21/51頁
文件大?。?/td> 211K
代理商： UPD4990AC-A
23
CHAPTER 4 EXPLANATION OF ELECTRICAL CHARACTERISTICS
4.1 CRYSTAL OSCILLATOR
This crystal oscillator of
PD4990A is consisted a CMOS inverter, a feedback resistor Rf, and a stabilization resistor
RD. (Rf
1 M
, RD = 100 k) X’TAL and XTAL are connected CG or CD. Value of CG and CD should be adjusted for
user’s system.
Fig. 4-1 Crystal Oscillator
Please adjust value of CD or CG.
Wire length around CG, CD, crystal and
PD4990A should be short length.
4.2 HOW TO ADJUST OSCILLATION FREQUENCY
To adjust oscillation frequency, TP is connected to a frequency counter or a period counter. And Timing Pulse should
appeare to TP.
4.3 OSCILLATION CHARACTERISTICS
Measurement circuit of oscillation characteristics is shown Fig. 4-2.
Fig. 4-2 Measurement Circuit of Oscillation Characteristics
CG
CD
XTAL
RD
Rf
X
@
VDD or VSS
CG
≈ CD ≈ 20 pF
X: 32.768 kHz
XTAL
13
CG
XTAL
12
CD
TP
10
VDD
14
VSS
7
10 k
PD4990A
X'TAL32.768 kHz
MX-38T
~
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