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TC7116A データシート(PDF) 8 Page - Microchip Technology

部品番号 TC7116A
部品情報  3-1/2 Digit Analog-to-Digital Converters with Hold
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メーカー  MICROCHIP [Microchip Technology]
ホームページ  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC7116A データシート(HTML) 8 Page - Microchip Technology

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TC7116/A/TC7117/A
DS21457D-page 8
 2002-2012 Microchip Technology Inc.
3.0
DETAILED DESCRIPTION
(All Pin Designations Refer to 40-Pin PDIP.)
3.1
Analog Section
Figure 3-1 shows the block diagram of the analog sec-
tion for the TC7116/TC7116A and TC7117/TC7117A.
Each measurement cycle is divided into three phases:
(1) Auto-Zero (AZ), (2) Signal Integrate (INT), and
(3) Reference Integrate (REF), or De-integrate (DE).
3.1.1
AUTO-ZERO PHASE
High and low inputs are disconnected from the pins and
internally shorted to analog common. The reference
capacitor is charged to the reference voltage. A feed-
back loop is closed around the system to charge the
auto-zero capacitor (CAZ) to compensate for offset volt-
ages in the buffer amplifier, integrator, and comparator.
Since the comparator is included in the loop, AZ
accuracy is limited only by system noise. The offset
referred to the input is less than 10
V.
3.1.2
SIGNAL INTEGRATE PHASE
The auto-zero loop is opened, the internal short is
removed, and the internal high and low inputs are
connected to the external pins. The converter then inte-
grates the differential voltages between VIN+ and VIN-
for a fixed time. This differential voltage can be within a
wide Common mode range: 1V of either supply. How-
ever, if the input signal has no return with respect to the
converter power supply, VIN- can be tied to analog
common to establish the correct Common mode
voltage. At the end of this phase, the polarity of the
integrated signal is determined.
FIGURE 3-1:
Analog Section of TC7116/TC7116A 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.
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


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