参数资料
型号: TC7116IPL
元件分类: ADC
英文描述: 1-CH DUAL-SLOPE ADC, PDIP40
封装: PLASTIC, DIP-40
文件页数: 6/32页
文件大小: 515K
代理商: TC7116IPL
TC7106/A/TC7107/A
DS21455C-page 14
2006 Microchip Technology Inc.
In some applications, a scale factor other than unity
may exist between a transducer output voltage and the
required digital reading. Assume, for example, a pres-
sure transducer output is 400mV for 2000 lb/in2. Rather
than dividing the input voltage by two, the reference
voltage should be set to 200mV. This permits the trans-
ducer input to be used directly.
The differential reference can also be used when a
digital zero reading is required when VIN is not equal to
zero. This is common in temperature measuring instru-
mentation. A compensating offset voltage can be
applied between analog common and VIN-. The trans-
ducer output is connected between VIN+ and analog
common.
The internal voltage reference potential available at
analog common will normally be used to supply the
converter’s reference. This potential is stable when-
ever the supply potential is greater than approximately
7V. In applications where an externally generated
reference voltage is desired, refer to Figure 7-1.
FIGURE 7-1:
External Reference
TC7106A
TC7107A
6.8V
Zener
IZ
V+
1.2V
Ref
Common
TC7106A
TC7107A
6.8k
Ω
20k
Ω
VREF+
VREF-
VREF+
VREF-
(a)
(b)
V+
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