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

TC14433/A
3-1/2 Digit, Analog-to-Digital Converter
Features:
• Accuracy: ±0.05% of Reading ±1 Count
• Two Voltage Ranges: 1.999V and 199.9 mV
• Up to 25 Conversions Per Second
• Z_IN > 1000M Ohms
• Single Positive Voltage Reference
• Auto-Polarity and Auto-Zero
• Overrange and Underrange Signals Available
• Operates in Auto-Ranging Circuits
• Uses On-Chip System Clock or External Clock
• Wide Supply Range: ±4.5V to ±8V
Applications:
• Portable Instruments
• Digital Voltmeters
• Digital Panel Meters
• Digital Scales
• Digital Thermometers
• Remote A/D Sensing Systems
Package Type
Description
The TC14433 is a low-power, high-performance,
monolithic CMOS 3-1/2 digit A/D converter. The
TC14433 combines both analog and digital circuits on
a single IC, thus minimizing the number of external
components.
This dual slope A/D converter provides automatic
polarity and zero correction with the addition of two
external resistors and two capacitors. The full scale
voltage range of this ratiometric IC extends from
199.9 millivolts to 1.999 volts. The TC14433 can
operate over a wide range of power supply voltages,
including batteries and standard 5-volt supplies.
The TC14433A features improved performance over
the industry standard TC14433. Rollover, which is the
measurement of identical positive and negative
signals, is specified to have the same reading within
one count for the TC14433A. Power consumption of
the TC14433A is typically 4 mW, approximately one-
half that of the industry standard TC14433.
The TC14433/A is available in 24-Pin PDIP, 24-Pin
SOIC (TC14433 device only), and 28-Pin PLCC
packages.
24-Pin PDIP (Wide)
24-Pin SOIC (Wide)
V_{AG 1}
V_{REF 2}
V_{X 3}
R_{1 4}
R₁/C_{1 5}
C_{1 6}
CO_{1 7}
CO_{2 8}
DU ₉
CLK1 ₁₀
CLK0 ₁₁
V_{EE 12}
24 ^VDD
23 ^Q3
22 ^Q2
21 ^Q1
TC14433/A ^{20 Q0}
19 ^DS1
18 ^DS2
17 ^DS3
16 ^DS4
15 ^OR
14 ^EOC
13 ^VSS
28-Pin PLCC
4 3 2 1 28 27 26
R₁ 5
25 Q₁
R₁/C₁ 6
C₁ 7
NC 8
TC14433/A
24 Q₀
23 DS₁
22 NC
CO₁ 9
21 DS₂
CO₂ 10
20 DS₃
DU 11
19 DS₄
12 13 14 15 16 17 18
Note 1: NC = No internal connection (In 28-Pin PLCC).
2: 24-Pin SOIC (Wide) package, only for TC14433
device.
© 2008 Microchip Technology Inc.
DS21394D-page 1