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| 型号： | TC835CKW |
| 元件分类： | ADC |
| 英文描述： | 1-CH DUAL-SLOPE ADC, PQFP44 |
| 封装： | PLASTIC, QFP-44 |
| 文件页数： | 24/24页 |
| 文件大小： | 543K |
| 代理商： | TC835CKW |
2002 Microchip Technology Inc.
DS21478B-page 9
TC835
4.0
ANALOG SECTION
FUNCTIONAL DESCRIPTION
(In Reference to the 28-Pin Plastic Package)
4.1
Differential Inputs
(+INPUT (Pin 10) and
–INPUT (Pin 9))
The TC835 operates with differential voltages within
the input amplifier Common mode range. The input
amplifier Common mode range extends from 0.5V
below the positive supply to 1V above the negative
supply. Within this Common mode voltage range, an
86dB Common mode rejection ratio is typical.
The integrator output also follows the Common mode
voltage. The integrator output must not be allowed to
saturate. An example of a worst case condition would
be when a large positive Common mode voltage with a
near full scale negative differential input voltage is
applied. The negative input signal drives the integrator
positive when most of its swing has been used up by
the positive Common mode voltage. For these critical
applications, the integrator swing can be reduced to
less than the recommended 4V full scale swing, with
the effect of reduced accuracy. The integrator output
can swing within 0.3V of either supply without loss of
linearity.
4.2
Analog Common Input (Pin 3)
ANALOG COMMON is used as the -INPUT return dur-
ing auto zero and de-integrate. If -INPUT is different
from ANALOG COMMON, a Common mode voltage
exists in the system. This signal is rejected by the
excellent CMRR of the converter. In most applications,
-INPUT will be set at a fixed, known voltage (power
supply common, for instance). In this application,
ANALOG COMMON should be tied to the same point,
thus removing the common-mode voltage from the
converter. The reference voltage is referenced to
ANALOG COMMON.
4.3
Reference Voltage Input
(REF IN (Pin 2))
The REF IN input must be a positive voltage with
respect to ANALOG COMMON. A reference voltage
circuit is shown in Figure 4-1.
FIGURE 4-1:
USING AN EXTERNAL
REFERENCE
MCP1525
2.5 VREF
V+
10k
V+
REF
IN
ANALOG
COMMON
Analog Ground
TC835
1
F
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