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TC811 Datasheet(PDF) 5 Page - Microchip Technology

Part # TC811
Description  3-1/2 Digit Analog-To-Digital Converter with Hold and Differential Reference Inputs
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC811 Datasheet(HTML) 5 Page - Microchip Technology

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5
TC811
TC811-7 11/5/96
© 2001 Microchip Technology Inc.
DS21472A
3-1/2 Digit Analog-To-Digital Converter with
Hold and Differential Reference Inputs
where:
VREF = Reference voltage
tINT = Integration Time
tDEINT = Deintegration Time
GENERAL THEORY OF OPERATION
Dual-Slope Conversion Principles
(All Pin Designations Refer to 40-Pin DIP Package)
The TC811 is a dual slope, integrating analog-to-digital
converter. An understanding of the dual slope conversion
technique will aid the user in following the detailed TC811
theory of operation following this section. A conventional
dual slope converter measurement cycle has two distinct
phases:
1) Input Signal Integration
2) Reference Voltage Integration (Deintegration)
Referring to Figure 2, the unknown input signal to be
converted is integrated from zero for a fixed time period
(TINT), measured by counting clock pulses. A constant
reference voltage of the opposite polarity is then integrated
until the integrator output voltage returns to zero. The
reference integration (deintegration) time (TDEINT) is then
directly proportional to the unknown input voltage (VIN).
In a simple dual slope converter, a complete conversion
requires the integrator output to “ramp-up” from zero and
“ramp-down” back to zero. A simple mathematical equation
relates the input signal, reference voltage and integration
time:
30
20
10
0
0.1/T
1/T
10/T
INPUT FREQUENCY
T = MEASUREMENT PERIOD
Figure 2. Basic Dual Slope Converter
REF
VOLTAGE
ANALOG
INPUT
SIGNAL
+/–
DISPLAY
SWITCH
DRIVER
CONTROL
LOGIC
CLOCK
COUNTER
POLARITY CONTROL
PHASE
CONTROL
VIN
VIN
VFULL SCALE
1.2 VFULL SCALE
VARIABLE
REFERENCE
INTEGRATE
TIME
FIXED
SIGNAL
INTEGRATE
TIME
INTEGRATOR
C
COMPARATOR
VREF
+
TC811
33
35
240k
10k
31
29
39
40
VREF
0.47
µF
0.1
µF
V
1
OSC
2
OSC
TO ANALOG COMMON
(PIN 32)
2 CONVERSION/SEC
180k
0.068
µF
0.01
µF
ANALOG
INPUT
+
C
REF
34
C
REF
+
VIN
+
VIN
ANALOG
COMMON
VINT
VBUFF
CAZ
20
21
38
SEGMENT
DRIVE
9–19
22–25
POL
BP
V
+
MINUS SIGN
BACKPLANE
28
LCD
1M
27
30
32
33
36
9V
+
26
20pF
10pF
V +
V +
22M
470k
1
HLDR
0
tINT
1
VREF tDEINT
RINT CINT
RINT CINT
VIN(t) dt =
[ ]
For a constant VINT:
VIN = VREF
tDEINT
tINT
Figure 3. Normal-Mode Rejection of
Dual Slope Converter
Figure 1. Typical Operating Circuit


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