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| 型号： | TC7126RCLW |
| 元件分类： | ADC |
| 英文描述： | 1-CH DUAL-SLOPE ADC, PARALLEL ACCESS, PQCC44 |
| 封装： | REVERSE, PLASTIC, LCC-44 |
| 文件页数： | 6/26页 |
| 文件大小： | 413K |
| 代理商： | TC7126RCLW |
TC7126/A
DS21458C-page 14
2006 Microchip Technology Inc.
7.0
DEVICE PIN FUNCTIONAL
DESCRIPTION
(Pin Numbers Refer to the 40-Pin PDIP.)
7.1
Differential Signal Inputs
VIN+ (Pin 31), VIN- (Pin 30)
The TC7126A is designed with true differential inputs
and accepts input signals within the input stage
Common mode voltage range (VCM). Typical range is
V+ – 1V to V- + 1V. Common mode voltages are
removed from the system when the TC7126A operates
from a battery or floating power source (isolated from
measured system), and VIN- is connected to analog
In systems where Common mode voltages exist, the
TC7126A’s 86 dB Common mode rejection ratio
minimizes error. Common mode voltages do, however,
affect the integrator output level. A worst-case condi-
tion exists if a large positive VCM exists in conjunction
with a full scale negative differential signal. The
negative signal drives the integrator output positive
the integrator output swing can be reduced below the
recommended 2V full scale swing. The integrator
output will swing within 0.3V of V+ or V- without
increased linearity error.
FIGURE 7-1:
Common Mode Voltage
Reduces Available Integrator Swing (V
COM ≠ VIN)
7.2
Differential Reference
VREF+ (Pin 36), VREF- (Pin 35)
The reference voltage can be generated anywhere
within the V+ to V- power supply range.
To prevent rollover type errors being induced by large
Common mode voltages, CREF should be large
compared to stray node capacitance.
The TC7126A offers a significantly improved analog
common
temperature
coefficient.
This
potential
provides a very stable voltage, suitable for use as a ref-
erence. The temperature coefficient of analog common
is typically 35ppm/°C for the TC7126A and 80 ppm/°C
for the TC7126.
FIGURE 7-2:
Common Mode Voltage Removed in Battery Operation with V
IN = Analog Common
RI
+
–
VIN
CI
Integrator
VI =
[
VCM – VIN
Input
Buffer
CI = Integration capacitor
RI = Integration resistor
4000
FOSC
tI = Integration time =
Where:
VI
–
+
–
+
tI
RI CI
VCM
VBUFF
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
TC7126A
+
VIN-
VIN+
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