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TC514COI датащи(PDF) 2 Page - Microchip Technology

номер детали TC514COI
подробное описание детали  Precision Analog Front Ends
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC514COI датащи(HTML) 2 Page - Microchip Technology

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TC500/A/510/514
DS21428B-page 2
© 2002 Microchip Technology Inc.
General Description
TheTC500/A/510/514 family are precision analog front
ends that implement dual slope A/D converters having
a maximum resolution of 17-bits plus sign. As a mini-
mum, each device contains the integrator, zero cross-
ing comparator and processor interface logic. The
TC500 is the base (16-bit max) device and requires
both positive and negative power supplies. The
TC500A is identical to the TC500 with the exception
that it has improved linearity, allowing it to operate to a
maximum resolution of 17-bits. The TC510 adds an on-
board negative power supply converter for single sup-
ply operation. The TC514 adds both a negative power
supply converter and a 4 input differential analog
multiplexer.
Each device has the same processor control interface
consisting of 3 wires: control inputs (A and B) and zero-
crossing comparator output (CMPTR). The processor
manipulates A, B to sequence the TC5XX through four
phases of conversion: Auto Zero, Integrate, De-inte-
grate and Integrator Zero. During the Auto Zero phase,
offset voltages in the TC5XX are corrected by a closed
loop feedback mechanism. The input voltage is applied
to the integrator during the Integrate phase. This
causes an integrator output dv/dt directly proportional
to the magnitude of the input voltage. The higher the
input voltage, the greater the magnitude of the voltage
stored on the integrator during this phase. At the start
of the De-integrate phase, an external voltage refer-
ence is applied to the integrator and, at the same time,
the external host processor starts its on-board timer.
The processor maintains this state until a transition
occurs on the CMPTR output, at which time the proces-
sor halts its timer. The resulting timer count is the con-
verted analog data. Integrator Zero (the final phase of
conversion) removes any residue remaining in the
integrator in preparation for the next conversion.
The TC500/A/510/514 offer high resolution (up to 17-
bits), superior 50Hz/60Hz noise rejection, low power
operation, minimum I/O connections, low input bias
currents and lower cost compared to other converter
technologies having similar conversion speeds.
Typical Application
Level
Shift
Control Logic
Analog
Switch
Control
Signals
ACOM
VREF+
BUF
CAZ
Buffer
Integrator
SWR
SWIZ
CMPTR 1
CMPTR 2
CMPTR
Output
DGND
Control Logic
SW1
TC500
TC500A
TC510
TC514
CREF
CREF+
SWR
CREF-
CAZ
RINT
CINT
CINT
SWRI- SWRI-
SWRI+ SWRI-
SWZ
SWI
SWZ
VSS
OSC
+
+
+
Phase
Decoding
Logic
Polarity
Detection
DC-TO-DC
Converter
(TC510 & TC514)
-
+
A
B
0
0
Zero Integrator Output
0
1
Auto-Zero
1
0
Signal Integrate
1
1
Deintegrate
VREF-
VOUT-
COUT-
1.0µF
1.0µF
VSS
SWI
B
A
A0
A1
DIF.
MUX
(TC514)
CH1+
CH2+
CH3+
CH4+
CH1-
CH2-
CH3-
CH4-
CAP- CAP+
(TC500
TC500A)
Converter Sate


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