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參數(shù)資料
| 型號(hào)： | TC514 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | Precision Analog Front Ends |
| 中文描述： | 精密模擬前端 |
| 文件頁(yè)數(shù)： | 6/17頁(yè) |
| 文件大?。?/td> | 209K |
| 代理商： | TC514 |
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3-24
TELCOM SEMICONDUCTOR, INC.
Figure 2. Basic Dual-Slope Converter
PHASE
CONTROL
COMPARATOR
I
O
INTEGRATOR
–
CINT
ANALOG
INPUT
(VIN)
SWITCH DRIVER
REF
VOLTAGE
CONTROL
LOGIC
POLARITY
CONTROL
S1
I/O
TIMER
COUNTER
ROM
RAM
MICROCOMPUTER
A
B
CMPTR OUT
VSUPPLY
VINT
±
TINT
TC510
VIN
'
VFULL SCALE
VIN
'
1/2 VFULL SCALE
TDEINT
–
+
RINT
VINT
+
PIN DESCRIPTION
(Cont.)
Pin No
(TC500/A)
Pin No
(TC510)
Pin No
(TC514)
Symbol
CH4
–
A0
A1
Description
10
20
19
Negative analog input pin. MUX channel 4
Multiplexer input channel select input LSB. (See A1).
Multiplexer input channel select input MSB.
00 = Channel 1
01 = Channel 2
10 = Channel 3
11 = Channel 4
Phase control input pins: A1, A0 =
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 V
IN
to the integrator input where it is maintained for a
fixed time period (t
INT
). The application of V
IN
causes the
integrator output to depart 0V at a rate determined by the
magnitude of V
IN
, and a direction determined by the polarity
of V
IN
. The Deintegration phase is initiated immediately at
the expiration of t
INT
.
During Deintegration, S1 connects a reference voltage
(having a polarity opposite that of V
IN
) 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 (t
DEINT
), 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
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TC500COE | Precision Analog Front Ends |
| TC510COG | Precision Analog Front Ends |
| TC500 | Precision Analog Front Ends |
| TC500A | Precision Analog Front Ends |
| TC500ACPE | Precision Analog Front Ends |
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