參數(shù)資料
型號： TC7117CPI
元件分類： ADC
英文描述： 1-CH DUAL-SLOPE ADC, PDIP40
封裝： PLASTIC, DIP-40
文件頁數(shù)： 7/32頁
文件大?。?/td> 515K
代理商： TC7117CPI
2006 Microchip Technology Inc.
DS21455C-page 15
TC7106/A/TC7107/A
8.0
DEVICE PIN FUNCTIONAL
DESCRIPTION
8.1
Differential Signal Inputs
VIN+ (Pin 31), VIN- (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+ + 1V. 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 VIN- is
connected to analog common (VCOM) (see Figure 8-2).
In systems where Common mode voltages exist, the
86dB Common mode rejection ratio minimizes error.
Common mode voltages do, however, affect the inte-
grator output 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 (see
Figure ). 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 8-1:
Common Mode Voltage
Reduces Available Integrator Swing (V
COM ≠ VIN)
8.2
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 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.
8.3
Analog Common (Pin 32)
The analog common pin is set at a voltage potential
approximately 3.0V below V+. The potential is between
2.7V and 3.35V below V+. Analog common is tied inter-
nally to the N channel FET capable of sinking 20mA.
This FET will hold the common line at 3.0V should an
external load attempt to pull the common line toward
V+. Analog common source current is limited to 10
μA.
Analog common is, therefore, easily pulled to a more
negative voltage (i.e., below V+ – 3.0V).
The TC7106A connects the internal VIN+ and VIN-
inputs to analog common during the auto-zero cycle.
During the reference integrate phase, VIN- is con-
nected to analog common. If VIN- is not externally con-
nected to analog common, a Common mode voltage
exists. This is rejected by the converter’s 86dB Com-
mon mode rejection ratio. In battery operation, analog
common and VIN- are usually connected, removing
Common mode voltage concerns. In systems where V-
is connected to the power supply ground, or to a given
voltage, analog common should be connected to VIN-.
RI
+
–
VIN
VCM
CI
Integrator
VI =
[
VCM – VIN
Input Buffer
CI = Integration Capacitor
RI = Integration Resistor
4000
FOSC
TI = Integration Time =
Where:
VI
–
+
–
+
TI
RI CI
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