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ML145027EP Просмотр технического описания (PDF) - Unspecified

Номер в каталогеML145027EP ETC
Unspecified 
Компоненты ОписаниеEncoder and Decoder Pairs CMOS
ML145027EP Datasheet PDF : 19 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
ML145026, ML145027, ML145028
LANSDALE Semiconductor, Inc.
RS
11
CTC
RTC
12
13
INTERNAL
ENABLE
This oscillator operates at a frequency determined by the
external RC network; i.e.,
f
1
(Hz)
2.3 RTC CTC
for 1 kHz f 400 kHz
where: CTC= CTC + Clayout + 12 pF
RS 2 RTC
RS 20 k
RTC 10 k
400 pF < CTC < 15 µF
The value for RS should be chosen to be 2 times RTC. This range ensures
that current through RS is insignificant compared to current through RTC. The
upper limit for RS must ensure that RS x 5 pF (input capacitance) is small com-
pared to RTC x CTC.
For frequencies outside the indicated range, the formula is less accurate.
The minimum recommended oscillation frequency of this circuit is 1 kHz. Sus-
ceptibility to externally induced noise signals may occur for frequencies below
1 kHz and/or when resistors utilized are greater than 1 M.
Figure 9. Encoder Oscillator Information
TE
ENCODER
OSCILLATOR
(PIN 12)
Dout
(PIN 15)
PWmin
VT
(PIN 11)
DATA OUTPUTS
ENCODER
2 WORD TRANSMISSION
CONTINUOUS TRANSMISSION
1ST
DIGIT
9TH
DIGIT
HIGH
OPEN
LOW
1ST WORD
ENCODING SEQUENCE
DECODER
1ST
DIGIT
9TH
DIGIT
2ND WORD
1.1 (R2C2)
Figure 10. Timing Diagram
Page 9 of 19
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