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PDF TC514 Data sheet ( Hoja de datos )

Número de pieza TC514
Descripción Precision Analog Front Ends
Fabricantes Microchip Technology 
Logotipo Microchip Technology Logotipo



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TC500/A/510/514
Precision Analog Front Ends
Features:
• Precision (up to 17 bits) A/D Converter “Front
End”
• 3-Pin Control Interface to Microprocessor
• Flexible: User Can Trade-off Conversion Speed
www.DataSheet4U.com for Resolution
• Single-Supply Operation (TC510/TC514)
• 4 Input, Differential Analog MUX (TC514)
• Automatic Input Voltage Polarity Detection
• Low Power Dissipation:
- (TC500/TC500A): 10 mW
- (TC510/TC514): 18 mW
• Wide Analog Input Range:
- ±4.2V (TC500A/TC510)
• Directly Accepts Bipolar and Differential
Input Signals
Applications:
• Precision Analog Signal Processor
• Precision Sensor Interface
• High Accuracy DC Measurements
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
minimum, each device contains the integrator, zero
crossing 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-
supply 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
reference 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 processor halts its timer. The resulting timer count
is the converted 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 50/60 Hz 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.
© 2006 Microchip Technology Inc.
DS21428D-page 1

1 page




TC514 pdf
TC500/A/510/514
2.0 TYPICAL PERFORMANCE CURVES
Note:
The graphs and tables provided following this note are a statistical summary based on a limited number of
samples and are provided for informational purposes only. The performance characteristics listed herein
are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified
operating range (e.g., outside specified power supply range) and therefore outside the warranted range.
www.DataSheet4U.com
5
4
TA = +25°C
V+ = 5V
3
2
1
0
-1
-2 Slope 60Ω
-3
-4
-5
0 10 20 30 40 50 60 70 80
Load Current (mA)
FIGURE 2-1:
Current.
Output Voltage vs. Load
-0
TA = +25°C
-1
-2
-3
-4
-5
-6
-7
-8
0 2 4 6 8 10 12 14 16 18 20
Output Current (mA)
FIGURE 2-4:
Current.
Output Voltage vs. Output
200
V+ = 5V, TA = +25°C
175 Osc. Freq. = 100 kHz
150
125 CAP = 1 µF
100
75 CAP = 10 µF
50
25
0
0 1 2 3 4 5 6 7 8 9 10
Load Current (mA)
FIGURE 2-2:
Current.
Output Ripple vs. Load
100
V+ = 5V
90 IOUT = 10 mA
80
70
60
50
40
-50
-25
FIGURE 2-5:
vs. Temperature.
0 25 50
Temperature (°C)
75 100
Output Source Resistance
100 150
TA = +25°C
V+ = 5V
125
V+ = 5V
10 100
1
1
FIGURE 2-3:
Capacitance.
10 100
Oscillator Capacitance (pF)
1000
Oscillator Frequency vs.
75
50
-50 -25
FIGURE 2-6:
Temperature.
0 25 50 75 100 125
Temperature (°C)
Oscillator Frequency vs.
© 2006 Microchip Technology Inc.
DS21428D-page 5

5 Page





TC514 arduino
6.0 ANALOG SECTION
6.1 Differential Inputs (VIN+, VIN–)
The TC5XX operates with differential voltages within
the input amplifier Common mode range. The amplifier
Common mode range extends from 1.5V below
positive supply to 1.5V above negative supply. Within
this Common mode voltage range, Common mode
rejection is typically 80 dB. Full accuracy is maintained,
however, when the inputs are no less than 1.5V from
either supply.
The integrator output also follows the Common mode
voltage. The integrator output must not be allowed to
www.DataSheet4U.comsaturate. A worst-case condition exists, for example,
when a large, positive Common mode voltage, with a
near full-scale negative differential input voltage, is
applied. The negative input signal drives the integrator
positive when most of its swing has been used up by
the positive Common mode voltage. For these critical
applications, the integrator swing can be reduced. The
integrator output can swing within 0.9V of either supply
without loss of linearity.
6.2 Analog Common
Analog common is used as VIN return during system
zero and reference de-integrate. If VIN– is different from
analog common, a Common mode voltage exists in the
system. This signal is rejected by the excellent CMR of
the converter. In most applications, VIN– will be set at a
fixed known voltage (i.e., power supply common). A
Common mode voltage will exist when VIN– is not
connected to analog common.
6.3 Differential Reference
(VREF+, VREF–)
The reference voltage can be anywhere within 1V of
the power supply voltage of the converter. Rollover
error is caused by the reference capacitor losing or
gaining charge due to stray capacitance on its nodes.
TC500/A/510/514
The difference in reference for (+) or (-) input voltages
will cause a rollover error. This error can be minimized
by using a large reference capacitor in comparison to
the stray capacitance.
6.4 Phase Control Inputs (A, B)
The A, B unlatched logic inputs select the TC5XX
operating phase. The A, B inputs are normally driven
by a microprocessor I/O port or external logic.
6.5 Comparator Output
By monitoring the comparator output during the fixed
signal integrate time, the input signal polarity can be
determined by the microprocessor controlling the
conversion. The comparator output is high for positive
signals and low for negative signals during the signal
integrate phase (see Figure 6-1).
During the reference de-integrate phase, the
comparator output will make a high-to-low transition as
the integrator output ramp crosses zero. The transition
is used to signal the processor that the conversion is
complete.
The internal comparator delay is 2 μsec, typically.
Figure 6-1 shows the comparator output for large
positive and negative signal inputs. For signal inputs at
or near zero volts, however, the integrator swing is very
small. If Common mode noise is present, the
comparator can switch several times during the
beginning of the signal integrate period. To ensure that
the polarity reading is correct, the comparator output
should be read and stored at the end of the signal
integrate phase.
The comparator output is undefined during the auto-
zero phase and is used to time the integrator output
zero phase. (See Section 8.6 “Integrator Output Zero
Phase”).
Signal
Integrate
Integrator
Output
Reference
Deintegrate
Zero
Crossing
Comparator
Output
A. Positive Input Signal
Signal
Integrate
Reference
De-integrate
Integrator
Output
Comparator
Output
Zero
Crossing
B. Negative Input Signal
FIGURE 6-1:
Comparator Output.
© 2006 Microchip Technology Inc.
DS21428D-page 11

11 Page







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