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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)： | 10/15頁 |
| 文件大小： | 233K |
| 代理商： | UTC7106 |
UTC 7106
CMOS IC
UTC
UNISONIC TECHNOLOGIES CO., LTD.
10
QW-R502-018,B
40
39
38
TEST
CLOCK
INTERNAL TO PART
FIGURE 6A
40
39
38
RC OSCILLATOR
CLOCK
INTERNAL TO PART
FIGURE 6B
R
C
FIGURE 6. CLOCK CIRCUITS
÷
4
÷
4
COMPONENT VALUE SELECTION
Integrating Resistor
Both the buffer amplifier and the integrator have a class A output stage with 100
μ
A of quiescent current. They
can supply 4
μ
A of drive current with negligible nonlinearity. The integrating resistor should be large enough to
remain in this very linear region over the input voltage range, but small enough that undue leakage requirements are
not placed on the PC board. For 2V full scale, 470k
Ω
is near optimum and similarly a 47k
Ω
for a 200mV scale.
Integrating Capacitor
The integrating capacitor should be selected to give the maximum voltage swing that ensures tolerance buildup
will not saturate the integrator swing(approximately. 0.3V from either supply).In the UTC 7106, when the analog
COMMON is used as a reference, a nominal+2V fullscale integrator swing is fine. For three readings/second (48kHz
clock) nominal values for C
INT
are 0.22
μ
F and 0.10
μ
F, respectively. Of course, if different oscillator frequencies are
used, these values should be changed in inverse proportion to maintain the same output swing.
An additional requirement of the integrating capacitor is that it must have a low dielectric absorptiont to prevent
roll-over errors. While other types of capacitors are adequate for this application, polypropylene capacitors give
undetectable errors at reasonable cost.
Auto-Zero Capacitor
The size of the auto-zero capacitor has some influence on the noise of the system. For 200mV full scale where
noise is very important, a 0.47
μ
F capacitor is recommended. On the 2V scale, a 0.047
μ
F capacitor increases the
speed of recovery from overload and is adequate for noise on this scale.
Reference Capacitor
A 0.1
μ
F capacitor gives good results in most applications. However, where a large common mode voltage exists
(i.e.,the REF LO pin is not at analog COMMON)and a 200mV scale is used, a larger value is required to prevent
roll-ovre error. Generally 1
μ
F will hold the roll-over error to 0.5 count in this instance.
Oscillator Components
For all ranges of frequency a 91k
Ω
resistor is recommended and the capacitor is selected from the equation:
f= 0.45/RC For 48kHz Clock (3 Readings/sec), C=100pF.
Reference Voltage
The analog input required to generate full scale output (2000 counts) is: V
IN
=2V
REF
.Thus, for the 200mV and 2V
scale, V
REF
should equal 100mV and 1V, respectively.However,in many applications where the A/D is connected to
a transducer, there will exist a scale factor other than unity between the input voltage and the digital reading. For
instance, in a weighing system, the designer might like to have a full scale reading when the voltage from the
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