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TC7116 Datenblatt(PDF) 8 Page - Microchip Technology

Teilenummer TC7116
Bauteilbeschribung  3-1/2 Digit Analog-to-Digital Converters with Hold
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Hersteller  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC7116 Datenblatt(HTML) 8 Page - Microchip Technology

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TC7116/A/TC7117/A
DS21457B-page 8
© 2002 Microchip Technology Inc.
FIGURE 3-1:
ANALOG SECTION OF TC7116/TC7117A AND TC7117/TC7117A
3.1.3
REFERENCE INTEGRATE PHASE
The final phase is reference integrate, or de-integrate.
Input low is internally connected to analog common
and input high is connected across the previously
charged reference capacitor. Circuitry within the chip
ensures that the capacitor will be connected with the
correct polarity to cause the integrator output to return
to zero. The time required for the output to return to
zero is proportional to the input signal. The digital
reading displayed is:
EQUATION 3-1:
3.1.4
REFERENCE
The positive reference voltage (VREF+) is referred to
analog common.
3.1.5
DIFFERENTIAL INPUT
This input can accept differential voltages anywhere
within the Common mode range of the input amplifier
or, specifically, from 1V below the positive supply to 1V
above the negative supply. In this range, the system
has a CMRR of 86dB, typical. However, since the inte-
grator also swings with the Common mode voltage,
care must be exercised to ensure that the integrator
output does not saturate. A worst case condition would
be a large, positive Common mode voltage with a near
full scale negative differential input voltage. The nega-
tive 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 to less than the
recommended 2V full scale swing with little loss of
accuracy. The integrator output can swing within 0.3V
of either supply without loss of linearity.
3.1.6
ANALOG COMMON
This pin is included primarily to set the Common mode
voltage for battery operation (TC7116/TC7116A), or for
any system where the input signals are floating, with
respect to the power supply. The analog common pin
sets a voltage approximately 2.8V more negative than
the positive supply. This is selected to give a minimum
end of life battery voltage of about 6V. However, analog
common has some attributes of a reference voltage.
When the total supply voltage is large enough to cause
the zener to regulate (>7V), the analog common volt-
age will have a low voltage coefficient (0.001%), low
output impedance (
≅15Ω), and a temperature coeffi-
cient of less than 20ppm/°C, typically, and 50 ppm max-
imum. The TC7116/TC7117 temperature coefficients
are typically 80ppm/°C.
An external reference may be used, if necessary, as
shownin Figure3-2.
FIGURE 3-2:
USING AN EXTERNAL
REFERENCE
TC7116
TC7116A
TC7117
TC7117A
CREF
CREF+
CREF-
RINT
V+
CAZ
Auto-Zero
VINT
28
35
29
27
33
36
34
10
µA
31
AZ
AZ
INT
AZ & DE (±)
32
30
INT
26
Integrator
V+ -3V
Comparator
To
Digital
Section
DE (+)
DE
(–)
DE
(+)
DE (–)
V+
AZ
Analog
Common
VIN+
VIN-
VBUFF
CINT
VREF+
Low
Temp.
Drift
Zener
VREF
V-
+
+
+
+
1000 =
VIN
VREF
V+
V+
1.2V REF
COMMON
TC7116
TC7116A
TC7117
TC7117A
6.8k
VREF+
20k


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