TC14433 データシートの表示（PDF） - TelCom Semiconductor Inc => Microchip
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TC14433 Datasheet PDF : 10 Pages
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3-1/2 DIGIT A/D CONVERTERS
TC14433
TC14433A
(A) Crystal Oscillator Circuit
(B) LC Oscillator Circuit
10 CLK1
C1
18M
TC14433
11 CLK0
47k
C2
10 CLK1
L
C
TC14433
11 CLK0
C
f = 21͌2/LC
10 pF < C1 AND C2 < 200 pF
FOR L = 5 mH AND C = 0.01 µF, f ≅ 32 kHz
Figure 9. Alternate Oscillator Circuits
Segment 3 — This segment of the conversion cycle is
the same as Segment 1.
Segment 4 — Segment 4 is an up-going ramp cycle with
the unknown input voltage (VX) as the input to the integrator.
Figure 8 shows the equivalent configuration of the analog
section of the TC14433. The actual configuration of the
analog section is dependent upon the polarity of the input
voltage during the previous conversion cycle.
Segment 5 — This segment is a down-going ramp
period with the reference voltage as the input to the integra-
tor. Segment 5 of the conversion cycle has a time equal to
the number of counts stored in the offset storage latches
during Segment 2. As a result, the system zeros automati-
cally.
Segment 6 — This is an extension of Segment 5. The
time period for this portion is 4000 clock periods. The results
of the A/D conversion cycle are determined in this portion of
the conversion cycle.
+5V
0.1 µF
Vx
TC04
20K
12
3
0.1 µF
300k
RC
–5V
+5V
+5V
+5V
0.1
0.1 µF
SEGMENT
RESISTORS
11 10 2 12 24
1 16
150Ω (7)
3
23
4
9
7
10
1
22
2
10
6
11
R1*
21
4
20
3
11
5
12
5
12
4
13
5 TC14433
6
13
–5V
4543B
13
14
3
2
14
15
0.1 µF**
7
9
15
867
1
16
1413
8
14
0.1 µF 15 19 18 17 16
–5V
–5V
6
5
3
DSQ
CRQ
1
2
4
8
14013B
–5V
MINUS SIGN
–5V
200Ω
MPS-A12 PLUS SIGN
–5V
51k
110Ω
COMMON
ANODE LED
+5V
DISPLAY
9 D S Q 13
11 C R Q 12
7 10 14
50 µF
0.1 µF
MPS-A12
(4)
*R 1 = 470kΩ FOR 2V RANGE
R 1 = 27kΩ FOR 200mV RANGE
**MYLAR CAPACITOR
DS 4 –5V
DS 3
DS 2
DS 1
+5V
–5V
fgedcba
3-132
Figure 10. 3-1/2 Digit Voltmeter Common-Anode Displays, Flashing Overrange
TELCOM SEMICONDUCTOR, INC.
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