Datasheet > TSL245R-LF

TSL245R-LF

更新时间： 2024-02-08 12:41:23

品牌	Logo	应用领域
TAOS		转换器
页数	文件大小	规格书
10页	157K
描述
INFRARED LIGHT-TO-FREQUENCY CONVERTER

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中文翻译

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技术参数
数据手册

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TSL245R-LF 技术参数

是否Rohs认证：	符合	生命周期：	Contact Manufacturer
Reach Compliance Code：	unknown	风险等级：	5.59
安装特点：	SURFACE MOUNT	端子数量：	3
最高工作温度：	70 °C	最低工作温度：	-25 °C
子类别：	Photo ICs	最大压摆率：	0.003 mA
表面贴装：	YES	Base Number Matches：	1

TSL245R-LF 数据手册

TSL245R

INFRARED LIGHT-TO-FREQUENCY CONVERTER

TAOS060D − SEPTEMBER 2007

APPLICATION INFORMATION

Power-supply considerations

Power-supply lines must be decoupled by a 0.01-μF to 0.1-μF capacitor with short leads placed close to the

TSL245R (Figure 5). A low-noise power supply is required to minimize jitter on output pulse.

MCU

0.1 μF

TSL245R

Timer/Port

Figure 5. Typical TSL245R Interface to a Microcontroller

Device Operational Details

The frequency at the output pin (OUT) is given by:

f_O= f_D+ (R_e) (E_e)

where:

f_O

is the output frequency

f_D

R_e

E_e

is the output frequency for dark condition (E_e= 0)

is the device responsivity for a given wavelength of light given in kHz/(μW/cm²)

is the incident irradiance in μW/cm²

f is an output frequency resulting from leakage currents. As shown in the equation above, this frequency

represents a light-independent term in the total output frequency f . At very low light levels, this dark frequency

can be a significant portion of f . The dark frequency is temperature dependent. For optimum performance of

any given device over the full output range, the value of f should be measured (in the absence of light) and

later subtracted from subsequent light measurement (see Figure 1).

Output interface

The output of the device is designed to drive a standard TTL or CMOS logic input over short distances. If lines

greater than 12 inches are used on the output, a buffer or line driver is recommended.

Measuring the frequency

The choice of interface and measurement technique depends on the desired resolution and data-acquisition

rate. For maximum data-acquisition rate, period-measurement techniques are used.

Period measurement requires the use of a fast reference clock with available resolution directly related to

reference-clock rate. The technique is employed to measure rapidly varying light levels or to make a fast

measurement of a constant light source.

Maximum resolution and accuracy may be obtained using frequency-measurement, pulse-accumulation,

or integration techniques. Frequency measurements provide the added benefit of averaging out random- or

high-frequency variations (jitter) resulting from noise in the light signal. Resolution is limited mainly by available

counter registers and allowable measurement time. Frequency measurement is well suited for slowly varying

or constant light levels and for reading average light levels over short periods of time. Integration, the

accumulation of pulses over a very long period of time, can be used to measure exposure — the amount of light

present in an area over a given time period.

The LUMENOLOGY r Company

www.taosinc.com

1 2 345 6 7...10

中文翻译

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TSL24AW25	ETC	获取价格	WIRE TUFSIL 0.75MM WHITE 25M
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