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TC500ACOE View Datasheet(PDF) - TelCom Semiconductor Inc => Microchip

Part Name
Description
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TC500ACOE
TelCom-Semiconductor
TelCom Semiconductor Inc => Microchip TelCom-Semiconductor
TC500ACOE Datasheet PDF : 17 Pages
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TC500
TC500A
TC510
TC514
PRECISION ANALOG FRONT ENDS
PIN DESCRIPTION (Cont.)
Pin No
Pin No
(TC500/A) (TC510)
Pin No
(TC514)
10
20
19
Symbol
CH4
A0
A1
Description
Negative analog input pin. MUX channel 4
Multiplexer input channel select input LSB. (See 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:
ANALOG
INPUT
(VIN)
S1
±
REF
VOLTAGE
RINT
CINT
INTEGRATOR
TC510
VINT – COMPARATOR
+
+
SWITCH DRIVER
POLARITY
CONTROL
PHASE
CONTROL CONTROL
LOGIC
CMPTR OUT
AB
VIN Ϸ VFULL SCALE
VIN Ϸ 1/2 VFULL SCALE
VSUPPLY
VINT
TINT TDEINT
I/O
MICROCOMPUTER
ROM
RAM
TIMER
COUNTER
Figure 2. Basic Dual-Slope Converter
3-24
TELCOM SEMICONDUCTOR, INC.
 

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