LTC1090AC

更新时间： 2024-01-13 16:08:28

品牌	Logo	应用领域
凌特 - Linear		/
页数	文件大小	规格书
28页	343K
描述
Single Chip 10-Bit Data Acquisition System

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技术参数
数据手册

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LTC1090AC 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
零件包装代码：	DIP	包装说明：	DIP, DIP20,.3
针数：	20	Reach Compliance Code：	unknown
ECCN代码：	EAR99	HTS代码：	8542.39.00.01
风险等级：	5.75	最大模拟输入电压：	5.05 V
最小模拟输入电压：	-5.05 V	转换器类型：	ADC, SUCCESSIVE APPROXIMATION
JESD-30 代码：	R-GDIP-T20	JESD-609代码：	e0
最大线性误差 (EL)：	0.0488%	标称负供电电压：	-5 V
模拟输入通道数量：	8	位数：	10
功能数量：	1	端子数量：	20
最高工作温度：	125 °C	最低工作温度：	-55 °C
输出位码：	BINARY	输出格式：	SERIAL
封装主体材料：	CERAMIC, GLASS-SEALED	封装代码：	DIP
封装等效代码：	DIP20,.3	封装形状：	RECTANGULAR
封装形式：	IN-LINE	峰值回流温度（摄氏度）：	NOT SPECIFIED
电源：	5,GND/-5 V	认证状态：	Not Qualified
采样速率：	0.045 MHz	采样并保持/跟踪并保持：	SAMPLE
座面最大高度：	5.08 mm	子类别：	Analog to Digital Converters
标称供电电压：	5 V	表面贴装：	NO
技术：	CMOS	温度等级：	MILITARY
端子面层：	Tin/Lead (Sn/Pb)	端子形式：	THROUGH-HOLE
端子节距：	2.54 mm	端子位置：	DUAL
处于峰值回流温度下的最长时间：	NOT SPECIFIED	宽度：	7.62 mm
Base Number Matches：	1

LTC1090AC 数据手册

LTC1090

W U U

APPLICATIO S I FOR ATIO

voltage. The offset (which is typically a fixed voltage)

becomes a larger fraction of an LSB as the size of the LSB

is reduced. The typical curve of Unadjusted Offset Error vs

Reference Voltage shows how offset in LSBs is related to

reference voltage for a typical value of V_OS. For example,

a V_OSof 0.5mV which is 0.1LSB with a 5V reference

becomes 0.5LSB with a 1V reference and 2.5LSBs with a

0.2V reference. If this offset is unacceptable, it can be

corrected digitally by the receiving system or by offsetting

the “–” input to the LTC1090.

HORIZONTAL: 1µs/DIV

Figure 16. Poor Reference Settling Can Cause A/D Errors

6. Reduced Reference Operation

Noise with Reduced V_REF

The effective resolution of the LTC1090 can be increased

by reducing the input span of the converter. The LTC1090

exhibits good linearity and gain over a wide range of

reference voltages (see typical curves of Linearity and

Gain Error vs Reference Voltage). However, care must be

taken when operating at low values of V_REFbecause of the

reduced LSB step size and the resulting higher accuracy

requirementplacedontheconverter.Thefollowingfactors

must be considered when operating at low V_REFvalues:

The total input referred noise of the LTC1090 can be

reduced to approximately 200µV peak-to-peak using a

ground plane, good bypassing, good layout techniques

and minimizing noise on the reference inputs. This noise

isinsignificantwitha5Vreferencebutwillbecomealarger

fraction of an LSB as the size of the LSB is reduced. The

typical curve of Noise Error vs Reference Voltage shows

the LSB contribution of this 200µV of noise.

1. Conversion speed (ACLK frequency)

For operation with a 5V reference, the 200µV noise is only

0.04LSB peak-to-peak. In this case, the LTC1090 noise

will contribute virtually no uncertainty to the output code.

However, for reduced references, the noise may become

asignificantfractionofanLSBandcauseundesirablejitter

in the output code. For example, with a 1V reference, this

same 200µV noise is 0.2LSB peak-to-peak. This will

reduce the range of input voltages over which a stable

output code can be achieved by 0.2LSB. If the reference is

further reduced to 200mV, the 200µV noise becomes

equal to one LSB and a stable code may be difficult to

achieve.Inthiscaseaveragingreadingsmaybenecessary.

2. Offset

3. Noise

Conversion Speed with Reduced V_REF

With reduced reference voltages, the LSB step size is

reducedandtheLTC1090internalcomparatoroverdriveis

reduced. With less overdrive, more time is required to

perform a conversion. Therefore, the maximum ACLK

frequency should be reduced when low values of V_REFare

used. This is shown in the typical curve of Maximum

Conversion Clock Rate vs Reference Voltage.

This noise data was taken in a very clean setup. Any setup

induced noise (noise or ripple on V_CC, V_REF, V_INor V^–) will

add to the internal noise. The lower the reference voltage

to be used, the more critical it becomes to have a clean,

noise-free setup.

Offset with Reduced V_REF

The offset of the LTC1090 has a larger effect on the output

code when the A/D is operated with reduced reference

1090fc

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LTC1090ACJ	Linear	Single Chip 10-Bit Data Acquisition System	获取价格
LTC1090ACN	Linear	Single Chip 10-Bit Data Acquisition System	获取价格
LTC1090ACN#PBF	Linear	LTC1090 - Single Chip 10-Bit Data Acquisition System; Package: PDIP; Pins: 20; Temperature	获取价格
LTC1090AM	Linear	Single Chip 10-Bit Data Acquisition System	获取价格
LTC1090AMJ	Linear	Single Chip 10-Bit Data Acquisition System	获取价格
LTC1090C	Linear	Single Chip 10-Bit Data Acquisition System	获取价格

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