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| 型号： | TC510IOG713 |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO24 |
| 封装： | 0.300 INCH, PLASTIC, MS-013AD, SOIC-24 |
| 文件页数： | 6/34页 |
| 文件大小： | 634K |
| 代理商： | TC510IOG713 |
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TC500/A/510/514
DS21428D-page 14
2006 Microchip Technology Inc.
FIGURE 8-1:
Noise Threshold.
8.6
Integrator Output Zero Phase
The comparator delay and the controller’s response
latency may result in overshoot, causing charge
buildup on the integrator at the end of a conversion.
This charge must be removed or performance will
degrade. The integrator output zero phase should be
activated (AB = 00) until CMPTR goes high. It is
absolutely critical that this phase be terminated
immediately so that overshoot is not allowed to occur in
the opposite direction. At this point, it can be assured
that the integrator is near zero. Auto-zero should be
entered (AB = 01) and the TC5XX held in this state until
the next cycle is begun (see Figure 8-2).
FIGURE 8-2:
Overshoot.
8.7
Using the TC510/TC514
8.7.1
NEGATIVE SUPPLY VOLTAGE
CONVERTER (TC510, TC514)
A capacitive charge pump is employed to invert the
voltage on VDD for negative bias within the TC510/
TC514. This voltage is also available on the VOUT- pin
to provide negative bias elsewhere in the system. Two
external capacitors are required to perform the
conversion.
Timing is generated by an internal state machine driven
from an on-board oscillator. During the first phase,
capacitor CF is switched across the power supply and
charged to VS+. This charge is transferred to capacitor
COUT- during the second phase. The oscillator normally
runs at 100 kHz to ensure minimum output ripple. This
frequency can be reduced by placing a capacitor from
OSC to VDD. The relationship between the capacitor
value is shown in Section 2.0 “Typical Performance
8.7.2
ANALOG INPUT MULTIPLEXER
(TC514)
The TC514 is equipped with a four-input differential
analog multiplexer. Input channels are selected using
select inputs (A1, A0). These are high-true control
signals (i.e., channel 0 is selected when (A1, A0 = 00).
Low VREF
Normal VREF
High VREF
S
NTH
S
NTH
30V
S
NTH
Slope (S) =
NTH = Noise Threshold
VREF
RINT CINT
Integrator
Output
Comparator
Output Comp
Integrate
Phase
De-integrate Phase
Integrator
Zero Phase
Zero
Crossing
Overshoot
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相关代理商/技术参数 |
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| TC510IOI | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Precision Analog Front Ends with Dual Slope ADC |
| TC510IOI713 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Precision Analog Front Ends with Dual Slope ADC |
| TC510IOIOI713 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Precision Analog Front Ends |
| TC510IPE | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Precision Analog Front Ends with Dual Slope ADC |
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