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參數(shù)資料
| 型號： | TC826CBU |
| 廠商： | Microchip Technology Inc. |
| 元件分類： | 顯示驅(qū)動器 |
| 英文描述： | Analog-to-Digital Converter with Bar Graph Display Output |
| 中文描述： | 模擬與條形圖顯示數(shù)字轉(zhuǎn)換器輸出 |
| 文件頁數(shù)： | 6/12頁 |
| 文件大?。?/td> | 122K |
| 代理商： | TC826CBU |
3-176
TELCOM SEMICONDUCTOR, INC.
+
–
INTEGRATOR
REF
VOLTAGE
SWITCH DRIVER
+
–
PHASE CONTROL
POLARITY CONTROL
CONTROL
LOGIC
COMPARATOR
C
R
CLOCK
COUNTER
DISPLAY
ANALOG
INPUT
SIGNAL
+/–
FIXED SIGNAL
INTEGRATE
TIME
VARIABLE
REFERENCE
INTEGRATE
TIME
I
O
VIN
≈
1/2 VFULL–SCALE
VIN
≈
1/4 VFULL–SCALE
Figure 2. Basic Dual Slope Converter
TC826
A/D CONVERTER WITH
BAR GRAPH DISPLAY OUTPUT
DUAL SLOPE CONVERSION PRINCIPLES
The TC826 is a dual slope, integrating analog–to–digital
converter. The conventional dual slope converter measure-
ment cycle has two distinct phases:
Input Signal Integration
Reference Voltage Integration (Deintegration)
The input signal being converted is integrated for a fixed
time period (TSI). Time is measured by counting clock
pulses. An opposite polarity constant reference voltage is
then integrated until the integrator output voltage returns to
zero. The reference integration time is directly proportional
to the input signal (TRI). (Figure 2).
In a simple dual slope converter a complete conversion
requires the integrator output to ‘ramp–up’ and ‘ramp–
down’.
A simple mathematical equation relates the input signal
reference voltage and integration time:
T
SI
V
I N
(t) dt =
R C
1
∫
0
RC
V
R
T
R I
Where:
V
R
= Reference Voltage
V
SI
= Signal Integration Time (Fixed)
T
RI
= Reference Voltage Integration Time (Variable)
For a constant V
IN
:
V
I N
T
S I
T
R I
= V
R
The dual slope converter accuracy is unrelated to the
integrating resistor and capacitor values as long as they are
stable during a measurement cycle. An inherent benefit is
noise immunity. Noise spikes are integrated or averaged to
zero during the integration periods. Integrating ADCs are
immune to the large conversion errors that plague succes-
sive approximation converters in high noise environments.
Interfering signals with frequency components at multiples
of the averaging period will be attenuated. (Figure 3.)
The TC826 converter improves the conventional dual
slope conversion technique by incorporating an auto-zero
phase. This phase eliminates zero-scale offset errors and
drift. A potentiometer is not required to obtain a zero output
for zero input.
T = MEASUREMENT
PERIOD
30
20
10
0
0.1/T
1/T
10/T
INPUT FREQUENCY
N
Figure 3. Normal-Mode Rejection of Dual Slope Converter
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TC826-TB | 制造商:Thomas & Betts 功能描述:CABLE TIE MOUNT, NYLON 6.6, NATURAL; Mount Fixing Type:Screw; Mount Material:Nylon 6.6; Mount Color:Natural; Accessory Type:Mounting Base; For Use With:Cable Ties ;RoHS Compliant: Yes 制造商:Thomas & Betts 功能描述:Cable Accessories Two Direction Mounting Base Bulk |
| TC-827-SC | 制造商:Thomas & Betts 功能描述: |
| TC828-0 | 制造商:Thomas & Betts 功能描述:CABLE TIE MT .4X.9 2-DIR 8SCREW BLK |
| TC828A | 制造商:TELCOM 制造商全稱:TelCom Semiconductor, Inc 功能描述:Switched Capacitor Voltage Converter |
| TC828AECT | 制造商:TELCOM 制造商全稱:TelCom Semiconductor, Inc 功能描述:Switched Capacitor Voltage Converter |
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