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參數(shù)資料
| 型號： | UTC7106 |
| 廠商： | 友順科技股份有限公司 |
| 元件分類： | 串行ADC |
| 英文描述： | 3/12 DIGIT,LCD DISPLAY A/D CONVERTERS |
| 中文描述： | 3 / 12位數(shù)字，液晶顯示器的A / D轉(zhuǎn)換器 |
| 文件頁數(shù)： | 7/15頁 |
| 文件大?。?/td> | 233K |
| 代理商： | UTC7106 |
UTC 7106
CMOS IC
UTC
UNISONIC TECHNOLOGIES CO., LTD.
7
QW-R502-018,B
case condition would be a large positive common mode voltage with a near full scale negative differential input
voltage. 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 output swing can be reduced to less
than the recommended 2V full scale swing with little loss of accuracy. The integrator output can swing to within 0.3V
of either supply without loss of linearity.
DIFFERENTIAL REFERENCE
The reference voltage can be generated anywhere within the power supply voltage of the converter. The main
source of common mode error is a roll-over voltage caused by the reference capacitor losing or gaining charge to
stray capacity on its nodes. If there is a large common mode voltage, the reference capacitor can gain charge
(increase voltage) when called up to de-integrate a positive signal but lose charge (decrease voltage) when called
up to de-integrate a negative input signal. This difference in reference for positive or negative input voltage will give
a roll-over error. However, by selecting the reference capacitor such that it is large enough in comparison to the stray
capacitance, this error can be held to less than 0.5 count worst case. (See Component Value Selection)
COMMON
IN LO
30
32
31
V+
A-Z
INT
INT
A-Z AND DE(
±
)
V-
FIGURE 1. ANALOG SECTION
DE+
DE-
DE-
DE+
A-Z
A-Z
REF HI
REF LO
C
REF
+
STRAY
C
REF
34
36
35
33
28
1
2.8V
-
+
-
+
-
+
29
27
INT
A-Z
C
INT
C
AZ
INTEGRATOR
R
INT
BUFV+
STRAY
C
REF
-
TO
DIGITAL
SECTION
A-Z
COMPARATOR
INPUT
LOW
-
+
N
INPUT
HIGH
6.2V
10 A
IN HI
ANALOG COMMON
This pin is included primarily to set the common mode voltage for battery operation (UTC 7106) or for any system
where the input signals are floating with respect to the power supply. The COMMON pin sets a voltage that is
approximately 2.8V more negative than the positive supply. This is selected to give a minimum end-of-life battery
voltage of about 6V. However, analog COMMON has some of the attributes of a reference voltage. When the total
supply voltage is large enough to cause the zener to regulate(>7V), the COMMON voltage will have a low voltage
coefficient (0.001%/V), low output impedance (
≒
15
Ω
), and a temperature coefficient typically less than 80ppm/
℃
.
The UTC 7106, with its negligible dissipation, suffers from none of these problems. In either case, an external
reference can easily be added, as shown in Figure 1.
Analog COMMON is also used as the input low return during auto-zero and de-integrate. If IN LO is different from
analog COMMON, a common mode voltage exists in the system and is taken care of by the excellent CMRR of the
converter. However, in some applications IN LO 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 same holds true for the reference voltage. If reference can be conveniently tied to
analog COMMON, it should be since this removes the common mode voltage from the reference system.
Within the IC, analog COMMON is tied to an N-Channel FET that can sink approximately 30mA of current to hold
the voltage 2.8V below the positive supply (when a load is trying to pull the common line positive). However, there is
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