AME811A

更新时间： 2024-02-11 03:06:13

品牌	Logo	应用领域
安茂微 - AME		转换器
页数	文件大小	规格书
15页	908K
描述
3-1/2 Digit A/D Converter - Low Power With HOLD And Differential Reference Inputs

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技术参数
数据手册

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AME811A 技术参数

生命周期：	Contact Manufacturer	零件包装代码：	DIP
包装说明：	DIP, DIP40(UNSPEC)	针数：	40
Reach Compliance Code：	compliant	HTS代码：	8542.39.00.01
风险等级：	5.81	最大模拟输入电压：	12 V
转换器类型：	A/D CONVERTER	JESD-30 代码：	R-PDIP-T40
功能数量：	1	端子数量：	40
最高工作温度：	70 °C	最低工作温度：
输出位码：	OFFSET BINARY	封装主体材料：	PLASTIC/EPOXY
封装代码：	DIP	封装等效代码：	DIP40(UNSPEC)
封装形状：	RECTANGULAR	封装形式：	IN-LINE
电源：	9 V	认证状态：	Not Qualified
子类别：	Analog to Digital Converters	标称供电电压：	9 V
表面贴装：	NO	技术：	CMOS
温度等级：	COMMERCIAL	端子形式：	THROUGH-HOLE
端子位置：	DUAL	Base Number Matches：	1

AME811A 数据手册

Analog Microelectronics, Inc.

3-1/2 Digit A/D Converter - Low Power

With HOLD And Differential Reference Inputs

AME811/AME811A/AME811R

The A/D conversion has the following three phases:

1. Auto-Zero Phase

2. Integration Phase

1V below the V+. The integrator output can swing within

0.3 V of V+ or V- without increasing linearity errors.

Care must be exercised to make sure the integrator

output does not saturate. In a typical application, the

common mode is eliminated by connecting the INLO

to COM, Analog Common.

3. De-integration Phase

Auto-Zero Phase

The INHI and INLO are shorted to analog common in-

ternally. The reference capacitor is charged to the ref-

erence voltage. A feedback loop is closed around the

system to cancel the offset voltage of buffer, integrator

and comparator.

Differential Reference (VREF+ & VREF-)

The reference voltage can be generated anywhere

within the V+ to V-. Under a large common mode volt-

age, reference capacitor can gain charge during the

de-integration of a positive signal. The reference ca-

pacitor will lose charge when de-integrating a negative

input signal. The difference in reference voltage for

positive or negative input voltages can cause the

rollover error. To prevent rollover error from being in-

duced by large common-mode voltages, reference ca-

pacitor should be large compared to stray node capaci-

tance.

Signal Integration phase

The converter integrates the differential voltage across

the INHI and INLO for a fixed time, 1000 system clocks.

The polarity of the signal is determined at the end of

this phase.

Reference Integration Phase

INLO is internally connected to the Analog Common,

INHI is connected across the reference capacitor with

appropriate polarity determined by the control circuit.

The integrator output will then return to zero. The time

it takes to return to zero, 1000 x VIN /VREF, is the digi-

tal representation of the analog signal.

Analog Common (COM)

The Analog Common is to set a common mode volt-

age for the analog signal. The analog common is typi-

cally 3.0V below V+, set primary for the battery oper-

ated application. Analog common is capable to sink 20

mA. It’s source current is limited to 10 µA. Analog

common is therefore easily pulled to a more negative

voltage to override the internal reference. When sup-

ply voltage is greater than 7V, analog common can be

used as reference source with temperature coefficient

Differential Signal Inputs (INHI & INLO)

The AME811 has true differential inputs and accepts

input signals within the input common mode voltage

range (Vcm). Typical range is from 1V above the V- to

of typically 50 ppm/ C.

1...4 5 678 9 10...15

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与AME811A相关器件

型号	品牌	描述	获取价格	数据表
AME811ACKW	AME	3-1/2 Digit A/D Converter - Low Power With HOLD And Differential Reference Inputs	获取价格
AME811CPL	AME	3-1/2 Digit A/D Converter - Low Power With HOLD And Differential Reference Inputs	获取价格
AME811R	AME	3-1/2 Digit A/D Converter - Low Power With HOLD And Differential Reference Inputs	获取价格
AME811RCPL	AME	3-1/2 Digit A/D Converter - Low Power With HOLD And Differential Reference Inputs	获取价格
AME8500	AME	UProcessor Supervisory	获取价格
AME8500AEET	AME	Micropower uP Reset Family	获取价格

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