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TC514COI Fiches technique(PDF) 6 Page - TelCom Semiconductor, Inc

No de pièce TC514COI
Description  PRECISION ANALOG FRONT ENDS
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Fabricant  TELCOM [TelCom Semiconductor, Inc]
Site Internet  http://www.telcom-semi.com
Logo TELCOM - TelCom Semiconductor, Inc

TC514COI Fiches technique(HTML) 6 Page - TelCom Semiconductor, Inc

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TELCOM SEMICONDUCTOR, INC.
Figure 2. Basic Dual-Slope Converter
PHASE
CONTROL
COMPARATOR
INTEGRATOR
CINT
ANALOG
INPUT
(VIN)
SWITCH DRIVER
REF
VOLTAGE
CONTROL
LOGIC
POLARITY
CONTROL
S1
I/O
TIMER
COUNTER
ROM
RAM
MICROCOMPUTER
AB
CMPTR OUT
VSUPPLY
±
TINT
TC510
VINT
VIN
VFULL SCALE
VIN
1/2 VFULL SCALE
TDEINT
+
RINT
VINT
+
PIN DESCRIPTION (Cont.)
Pin No
Pin No
Pin No
(TC500/A)
(TC510)
(TC514)
Symbol
Description
10
CH4
Negative analog input pin. MUX channel 4
20
A0
Multiplexer input channel select input LSB. (See A1).
19
A1
Multiplexer input channel select input MSB.
00 = Channel 1
Phase control input pins: A1, A0 =
01 = Channel 2
10 = Channel 3
11 = Channel 4
GENERAL THEORY OF OPERATION
Dual-Slope Conversion Principles (Figure 2)
Actual data conversion is accomplished in two phases:
input signal Integration and reference voltage Deintegration.
The integrator output is initialized to 0V prior to the start
of Integration. During Integration, analog switch S1 con-
nects VIN to the integrator input where it is maintained for a
fixed time period (tINT). The application of VIN causes the
integrator output to depart 0V at a rate determined by the
magnitude of VIN, and a direction determined by the polarity
of VIN. The Deintegration phase is initiated immediately at
the expiration of tINT.
During Deintegration, S1 connects a reference voltage
(having a polarity opposite that of VIN) to the integrator input.
At the same time, an external precision timer is started. The
Deintegration phase is maintained until the comparator
output changes state, indicating the integrator has returned
to its starting point of 0V. When this occurs, the precision
timer is stopped. The Deintegration time period (tDEINT), as
measured by the precision timer, is directly proportional to
the magnitude of the applied input voltage.
A simple mathematical equation relates the Input
Signal, Reference Voltage and Integration time:
PRECISION ANALOG FRONT ENDS
TC500
TC500A
TC510
TC514


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