參數(shù)資料
型號： TC7116AIPL
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)： 8/32頁
文件大?。?/td> 515K
代理商： TC7116AIPL
TC7106/A/TC7107/A
DS21455C-page 16
2006 Microchip Technology Inc.
FIGURE 8-2:
Common Mode Voltage Removed in Battery Operation with VIN- = Analog Common
The analog common pin serves to set the analog section
reference or common point. The TC7106A is specifically
designed to operate from a battery, or in any measure-
ment system where input signals are not referenced
(float), with respect to the TC7106A power source. The
analog common potential of V+ – 3.0V gives a 6V end of
battery life voltage. The common potential has a 0.001%
voltage coefficient and a 15
Ω output impedance.
With sufficiently high total supply voltage (V+ – V- >
7.0V), analog common is a very stable potential with
excellent temperature stability, typically 20ppm/°C.
This potential can be used to generate the reference
voltage. An external voltage reference will be unneces-
sary in most cases because of the 50ppm/°C maximum
temperature
coefficient.
See
Internal
Voltage
Reference discussion.
8.4
TEST (Pin 37)
The TEST pin potential is 5V less than V+. TEST may
be used as the negative power supply connection for
external CMOS logic. The TEST pin is tied to the inter-
nally generated negative logic supply (Internal Logic
Ground) through a 500
Ω resistor in the TC7106A. The
TEST pin load should be no more than 1mA.
If TEST is pulled to V+ all segments plus the minus sign
will be activated. Do not operate in this mode for more
than
several
minutes
with
the
TC7106A.
With
TEST = V+, the LCD segments are impressed with a
DC voltage which will destroy the LCD.
The TEST pin will sink about 10mA when pulled to V+.
8.5
Internal Voltage Reference
The analog common voltage temperature stability has
been significantly improved (Figure 8-3). The “A”
version of the industry standard circuits allow users to
upgrade old systems and design new systems without
external voltage references. External R and C values
do not need to be changed. Figure 8-4 shows analog
common supplying the necessary voltage reference for
the TC7106A/TC7107A.
FIGURE 8-3:
Analog Common
Temperature Coefficient
FIGURE 8-4:
Internal Voltage Reference
Connection
VBUF
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 Display
TC7106A
+
VIN-
VIN+
Typical
No Maximum Specified
No
Maximum
Specified
No
Maximum
Specified
Typical
200
180
160
140
120
100
80
60
40
20
0
Temperature
Coefficient
(ppm/°C)
ICL7136
TC
7106A
ICL7106
Maximum
Limit
V-
Analog
Common
TC7106A
TC7107A
VREF+
32
35
36
24k
Ω
1k
Ω
VREF-
VREF
1
Set VREF = 1/2 VFULL SCALE
V+
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相關代理商/技術參數(shù)
參數(shù)描述
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