TC14433_08 Datasheet, PDF (12/24 Pages) Microchip Technology – 3-1/2 Digit, Analog-to-Digital Converter

TC14433/A
470 kΩ 0.1 µF 0.1 µF
+5V
MCP1525
V_X
Input
V_IN
V_OUT
V_SS
20kΩ
1 µF
R₁ R₁ /C C₁ C0₁ C0₂
V_X
CLK1
V_AG
CLK0
D_U
OR
EOE
Q₀
TC14433
Q₁
V_REF
Q₂
V_SS
V_DD
V_EE
DS₄ DS₃ DS₂ DS₁
300 kΩ
+5V
A B1 _a
B
b
C ^I4511B c
D
d
LT
e
LE
f
V_SS V_DD g
Resitor Network
or Individual
Resistor*
R
R_DP
Alternate Overrange Circuit
with Separated LED
1/6 75492
OR
OR
1/7 1413
R_R
+5V
V_EE**
(Minus)
Minus
Control
R_M
+5V
75492
OR
1413*
Digit Drivers
Common
Cathode
Led Display
Note 1: For V_REF = 2000V; V: 1.999V full scale.
2: For V_REF = 200 mV; V: 199.9 mV full scale (change 470 kΩ to R = 27 kΩ and decimal point position.
3: Peak digit current for an eight displayed is 7 times the segment current:
*To increase segment current capability, add two 75491 ICs between 14511B and resistor network.
The use of the 1413 as digit driver increases digit current capability over the 75492.
**V can range between -2.8V and -11V.
FIGURE 5-2:
Display.
3-1/2 Digit LED Voltmeter with Low Component Count Using Common Cathode
(A) Crystal Oscillator Circuit
10
CLK₁
C₁
18 MΩ
TC14433
11 _CLK0
47 kΩ
C₂
10 pF < C₁ and C₂ < 200 pF
FIGURE 5-3:
Alternate Oscillator Circuits.
(B) LC Oscillator Circuit
10 _CLK1
C
L
TC14433
11
CLK₀
C
f = --------1----------
2π LC
For L = 5 mH and C = 0.01 µF @ 22.5 kHz
DS21394D-page 12
© 2008 Microchip Technology Inc.