參數(shù)資料
型號： TC835CKWTR
元件分類： ADC
英文描述： 1-CH DUAL-SLOPE ADC, PQFP44
封裝： PLASTIC, QFP-44
文件頁數(shù)： 23/24頁
文件大?。?/td> 543K
代理商： TC835CKWTR
TC835
DS21478B-page 8
2002 Microchip Technology Inc.
FIGURE 3-2:
SYSTEM ZERO PHASE
3.2.2
ANALOG INPUT SIGNAL
INTEGRATION
The TC835 integrates the differential voltage between
the +INPUT and -INPUT pins. The differential voltage
must be within thedeviceCommonmoderange (-1V
from either supply rail, typically). The input signal polarity
is determined at the end of this phase (see Figure 3-3).
FIGURE 3-3:
INPUT SIGNAL
INTEGRATION PHASE
3.2.3
REFERENCE VOLTAGE
INTEGRATION
The previously charged reference capacitor is con-
nected with the proper polarity to ramp the integrator
output back to zero (see Figure 3-4). The digital reading
displayed is:
FIGURE 3-4:
REFERENCE VOLTAGE
INTEGRATION CYCLE
3.2.4
INTEGRATOR OUTPUT ZERO
This phase guarantees the integrator output is at 0V
when the system zero phase is entered and that the
true system offset voltages are compensated for. This
phase normally lasts 100 to 200 clock cycles. If an
overrange condition exists, the phase is extended to
6200 clock cycles (see Figure 3-5).
FIGURE 3-5:
INTEGRATOR OUTPUT
ZERO PHASE
TABLE 3-1:
INTERNAL ANALOG GATE STATUS
+
-
+
-
+
-
+IN
REF
IN
Analog
Common
– IN
SWR
SWIZ
SWZ
Integrator
Switch Closed
Switch Open
SWRI+
Comparator
To Digital
Section
Analog
Input Buffer
RINT
CINT
CREF
CSZ
SWRI-
SWI
SWZ
SWRI+SWRI-
SWI
SW1
+
-
+
-
+
-
Analog
Common
– IN
Integrator
Switch Closed
Switch Open
Comparator
To
Digital
Section
Analog
Input Buffer
RINT
CINT
CREF
CSZ
SWI
+IN
SWRI+
SWRI-
REF
IN
SWR
SWZ
SWI
SW1
SWRI+SWRI-
SWIZ
SWZ
Reading = 10,000
[Differential Input]
VREF
+
-
+
-
+
-
REF
IN
Analog
Common
– IN
Integrator
Switch Closed
Switch Open
Comparator
To Digital
Section
Analog
Input Buffer
RINT
CINT
CREF
CSZ
SWRI+
SWRI+SWRI-
SWRI-
SWI
SW1
SWR
SWZ
SWIZ
SWZ
+IN
+
-
+
-
+
-
+ IN
Analog
Common
– IN
Integrator
Switch Closed
Switch Open
Comparator
To Digital
Section
Analog
Input Buffer
CREF
SWI
SWRI+
SWRI-
REF
IN
SWR
SWZ
SWI
SWRI+SWRI-
SW1
SWIZ
SWZ
RINT
CINT
CSZ
SWZ
Conversion Cycle Phase
SWI
SWRI+SWRI-SWZ
SWR
SW1
SWIZ
Reference Figures
System Zero
Closed
Figure 3-2
Input Signal Integration
Closed
Figure 3-3
Reference Voltage Integration
Closed*
Closed
Figure 3-4
Integrator Output Zero
Closed
Figure 3-5
*Note:
Assumes a positive polarity input signal. SWRI would be closed for a negative input signal.
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