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| 型号： | ALD500AUSWC |
| 厂商： | Advanced Linear Devices, Inc. |
| 英文描述： | PRECISION INTEGRATING ANALOG PROCESSOR |
| 中文描述： | 精密集成了模拟处理器 |
| 文件页数： | 5/11页 |
| 文件大小： | 88K |
| 代理商： | ALD500AUSWC |
ALD500AU/ALD500A/ALD500
Advanced Linear Devices
3
(integrate cycle)
(1)
VX = VINT - (VREF . tDINT / RINT . CINT)
(deintegrate cycle)
(2)
Combining equations 1 and 2 results in:
VIN / VREF = -tDINT / tINT
(3)
where:
Vx
= An offset voltage used as starting voltage
VINT = Voltage change across CINT during tINT and
during tDINT (equal in magnitude)
VIN
= Average, or an integrated, value of input voltage
to be measured during tINT (Constant VIN)
tINT = Fixed time period over which unknown voltage is
integrated
tDINT = Unknown time period over which a known
reference voltage is integrated
VREF = Reference Voltage
CINT = Integrating Capacitor value
RINT = Integrating Resistor value
Actual data conversion is accomplished in two phases: Input
Signal Integration Phase and Reference Voltage Deintegration
Phase.
The integrator output is initialized to 0V prior to the start of
Input Signal Integration Phase. During Input Signal Integration
Phase, internal analog switches connect VIN to the buffer
input where it is maintained for a fixed integration time period
(tINT). This fixed integration period is generally determined by
a digital counter
controlled by a crystal oscillator. The
application of VIN causes the integrator output to depart 0V at
a rate determined by VIN and a direction determined by the
polarity of VIN.
The Reference Voltage Deintegration Phase is initiated
immediately after tINT, within 1 clock cycle. During Reference
Voltage Deintegration Phase, internal analog switches connect
a reference voltage having a polarity opposite that of VIN to
the integrator input. Simultaneously the same digital counter
controlled by the same crystal oscillator used above is used to
start counting clock pulses.
The Reference Voltage
Deintegration Phase is maintained until the comparator output
inside the dual slope analog processor changes state, indicating
the integrator has returned to 0V. At that point the digital
counter is stopped. The Deintegration time period (tDINT), as
measured by the digital counter, is directly proportional to the
magnitude of the applied input voltage.
After the digital counter value has been read, the digital
counter, the integrator, and the auto zero capacitor are all
reset to zero through an Integrator Zero Phase and an Auto
Zero Phase so that the next conversion can begin again. In
practice, this process is usually automated so that analog-to-
digital conversion is continuously updated. The digital control
is handled by a microprocessor or a dedicated logic controller.
The output, in the form of a binary serial word, is read by a
microprocessor or a display adapter when desired.
Figure 2. Basic Dual-Slope Converter
S1
CINT
VINT
RINT
SWITCH DRIVER
CONTROL
LOGIC
POLARITY CONTROL
REF
SWITCHES
INTEGRATOR
COMPARATOR
PHASE
CONTROL
ANALOG
INPUT
(VIN)
OUTPUT
INTEGRATOR
VIN
≈ VFULL SCALE
VIN
≈ 1/2 VFULL SCALE
tINT
tDINT
VINT = 4.1V MAX
AB
Figure 2. Basic Dual-Slope Converter
+
-
VOLTAGE
REFERENCE
COUT
POLARITY
DETECTION
-
tDINT
VX
≈ 0
MICROCONTROLLER
(CONTROL LOGIC
+ COUNTER)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ALD500AUSWCL | 功能描述:模数转换器 - ADC 18 Bit A/D Processor RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| ALD500PC | 制造商:ALD 制造商全称:Advanced Linear Devices 功能描述:PRECISION INTEGRATING ANALOG PROCESSOR |
| ALD500PCL | 功能描述:模数转换器 - ADC 16 Bit A/D Processor RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| ALD500R | 制造商:ALD 制造商全称:Advanced Linear Devices 功能描述:PRECISION INTEGRATING ANALOG PROCESSOR WITH PRECISION VOLTAGE REFERENCE |
| ALD500R-50PE | 制造商:ALD 制造商全称:Advanced Linear Devices 功能描述:PRECISION INTEGRATING ANALOG PROCESSOR WITH PRECISION VOLTAGE REFERENCE |
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