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MC14532BCP Scheda tecnica(PDF) 6 Page - Motorola, Inc

Il numero della parte MC14532BCP
Spiegazioni elettronici  8-BIT PRIORITY ENCODER
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Produttore elettronici  MOTOROLA [Motorola, Inc]
Homepage  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

MC14532BCP Scheda tecnica(HTML) 6 Page - Motorola, Inc

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MOTOROLA CMOS LOGIC DATA
MC14532B
6
Figure 4. Two MC14532B’s Cascaded for 4–Bit Output
D15 D14 D13 D12 D11 D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
D7
D6
D5
D4
D3
D2
D1
D0
D7
D6
D5
D4
D3
D2
D1
D0
Q1
Q0
Q2
Q1
Q0
Q2
Q1
Q0
Q2
Q3
GS
3/4 MC14071B
VDD
Ein
Eout
Ein
Eout
Eout = “1”
WITH Din = “0”
Figure 5. Digital to Analog and Analog to Digital Converter
DIGITAL TO ANALOG CONVERSION
The digital eight–bit word to be converted is applied to
the inputs of the MC14512 with the most significant bit at
X7 and the least significant bit at X0. A clock input of up to
2.5 MHz (at VDD = 10 V) is applied to the MC14520B.
A compromise between Ibias for the MC1710 and ∆R
between N and P–channel outputs gives a value of R of
33 k ohms. In order to filter out the switching frequencies,
R C s h o u l d b e a b o u t 1 . 0 m s ( i f R = 3 3 k o h m s ,
C
[ 0.03 µF). The analog 3.0 dB bandwidth would then be
dc to 1.0 kHz.
ANALOG TO DIGITAL CONVERSION
An analog signal is applied to the analog input of the
MC1710. A digital eight–bit word known to represent a digi-
tized level less than the analog input is applied to the
MC14512 as in the D to A conversion. The word is increm-
ented at rates sufficient to allow steady state to be reached
between incrementations (i.e. 3.0 ms). The output of the
MC1710 will change when the digital input represents the
first digitized level above the analog input. This word is the
digital representation of the analog word.
ANALOG
OUTPUT
CLOCK
INPUT
ANALOG
INPUT
VDD
X7 X6 X5 X4 X3 X2 X1 X0
MC14512
A
B
C
MC1710
R
C
Z
VDD
VSS
Ein
D0 D1 D2 D3 D4 D5 D6 D7
Q2
Q0
Q1
STOP
WORD
INCREMENTATION
Q2
Q4
Q3
Q1
Q2
Q4
Q3
Q1
C
E
R
C
E
R
1/2 MC14520B
1/2 MC14520B
DIGITAL INPUT/OUTPUT
8–BIT WORD
TO BE CONVERTED


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