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參數(shù)資料
| 型號： | TC7107RCPLIJL |
| 元件分類： | ADC |
| 英文描述： | 1-CH DUAL-SLOPE ADC, PDIP40 |
| 封裝： | CERDIP-40 |
| 文件頁數(shù)： | 4/21頁 |
| 文件大?。?/td> | 269K |
| 代理商： | TC7107RCPLIJL |
12
TC7106
TC7106A
TC7107
TC7107A
3-1/2 DIGIT A/D CONVERTERS
Figure 7. External Reference
Device Pin Functional Description
Differential Signal Inputs
(V
+
IN (Pin 31), V
–
IN (Pin 30))
The TC7106A/7017A is designed with true differential
inputs and accepts input signals within the input stage
common mode voltage range (VCM). The typical range is V+
–1.0 to V– +1 V. Common-mode voltages are removed from
the system when the TC7106A/TC7107A operates from a
battery or floating power source (isolated from measured
system) and V–
IN is connected to analog common (VCOM):
See Figure 8.
In systems where common-mode voltages exist, the
86dB common-mode rejection ratio minimizes error. Com-
mon-mode voltages do, however, affect the integrator out-
put level. Integrator output saturation must be prevented. A
worst-case condition exists if a large positive VCM exists in
conjunction with a full-scale negative differential signal. The
negative signal drives the integrator output positive along
with VCM (Figure 9). For such applications the integrator
output swing can be reduced below the recommended 2.0V
full-scale swing. The integrator output will swing within 0.3V
of V+ or V– without increasing linearity errors.
Figure 8. Common-Mode Voltage Removed in Battery Operation with V–
IN = Analog Common
TC7106A
TC7107A
6.8V
ZENER
IZ
V+
TC04
V+
1.2V
REF
COMMON
TC7106A
TC7107A
6.8k
20k
+
VREF
–
VREF
+
VREF
–
VREF
(a)
(b)
V+
RI
+
–
VIN
V
C I
INTEGRATOR
VI =
[
VCM
VIN
–
INPUT
BUFFER
CI =
=
RI
INTEGRATION CAPACITOR
INTEGRATION RESISTOR
4000
f
INTEGRATION TIME
TI ==
Where:
VI
CM
OSC
–
+
–
+
TI
RI CI
Differential Reference
(V
+
REF (Pin 36), V
–
REF (Pin 35))
The reference voltage can be generated anywhere
within the V+ to V– power supply range.
To prevent rollover errors from being induced by large
common-mode voltages, CREF should be large compared to
stray node capacitance.
The TC7106A/TC7107A circuits have a significantly
lower analog common temperature coefficient. This gives a
very stable voltage suitable for use as a reference. The
temperature coefficient of analog common is 20ppm/
°C
typically.
VBUF
CAZ VINT
BP
POL
SEGMENT
DRIVE
OSC1
OSC3
OSC2
V
–
V
+
VREF
+
VREF
–
ANALOG
COMMON
V
–
V
+
V
–
V
+
GND
MEASURED
SYSTEM
POWER
SOURCE
9V
LCD DISPLAY
TC7106A
+
V
–
IN
V
+
IN
Figure 9.
Common-Mode Voltage Reduces Available Integrator
Swing. (VCOM
≠ VIN)
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