- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄385949 > TSL230 (Texas Instruments, Inc.) PROGRAMMABLE LIGHT-TO-FREQUENCY CONVERTERS PDF資料下載
參數(shù)資料
| 型號(hào)： | TSL230 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | PROGRAMMABLE LIGHT-TO-FREQUENCY CONVERTERS |
| 中文描述： | 可編程光到頻率變換器 |
| 文件頁數(shù)： | 6/7頁 |
| 文件大?。?/td> | 97K |
| 代理商： | TSL230 |
TSL230, TSL230A, TSL230B
PROGRAMMABLE LIGHT-TO-FREQUENCY CONVERTERS
SOES007B – OCTOBER 1992 – REVISED MARCH 1994
5–8
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
output-frequency scaling
Output-frequency scaling is controlled by two logic inputs, S2 and S3. Scaling is accomplished on chip by
internally connecting the pulse-train output of the converter to a series of frequency dividers. Divided outputs
available are divide-by 2, 10, 100, and 1 (no division). Divided outputs are 50 percent-duty-cycle square waves
while the direct output (divide-by 1) is a fixed-pulse-width pulse train. Because division of the output frequency
is accomplished by counting pulses of the principal (divide-by 1) frequency, the final-output period represents
an average of n (where n is 2, 10 or 100) periods of the principal frequency. The output-scaling-counter registers
are cleared upon the next pulse of the principal frequency after any transition of the S0, S1, S2, S3, or OE lines.
The output goes high upon the next subsequent pulse of the principal frequency, beginning a new valid period.
This minimizes the time delay between a change on the input lines and the resulting new output period in the
divided output modes. In contrast with the sensitivity adjust, use of the divided outputs lowers both the full-scale
frequency and the dark frequency by the selected scale factor.
The frequency-scaling function allows the output range to be optimized for a variety of measurement
techniques. The divide-by-1 or straight-through output can be used with a frequency counter, pulse accumulator,
or high-speed timer (period measurement). The divided-down outputs may be used where only a slower
frequency counter is available, such as a low-cost microcontroller, or where period measurement techniques
are used. The divide-by-10 and divide-by-100 outputs provide lower frequency ranges for high resolution-period
measurement.
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.
Using the divide-by-2 output, data can be collected at a rate of twice the output frequency or one data point every
microsecond for full-scale output. Period measurement requires the use of a fast reference clock with available
resolution directly related to reference-clock rate. Output scaling can be used to increase the resolution for a
given clock rate or to maximize resolution as the light input changes. Period measurement is used to measure
rapidly varying light levels or to make a very 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.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TSL235(中文) | Programmable Light-To-Frequency Converter(光頻轉(zhuǎn)換器) |
| TSL245(中文) | IR Light-To-Frequency Converter(紅外光頻轉(zhuǎn)換器) |
| TSL250(中文) | Light-To-Voltage Converter(光壓轉(zhuǎn)換器) |
| TSL251(中文) | Light-To-Voltage Converter(光壓轉(zhuǎn)換器) |
| TSL252(中文) | Light-To-Voltage Converter(光壓轉(zhuǎn)換器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TSL2301 | 制造商:TAOS 制造商全稱:TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS 功能描述:102 X 1 LINEAR OPTICAL SENSOR ARRAY WITH ANALOGTODIGITAL CONVERTER |
| TSL230A | 制造商:TI 制造商全稱:Texas Instruments 功能描述:PROGRAMMABLE LIGHT-TO-FREQUENCY CONVERTERS |
| TSL230AR | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:PROGRAMMABLE LIGHTTOFREQUENCY CONVERTERS |
| TSL230ARD | 功能描述:光頻率和光電壓 Light to Frequency Converter RoHS:否 制造商:ams 峰值波長:1000 nm 工作電源電壓:5 V 最大工作溫度:+ 85 C 最小工作溫度:- 25 C 安裝風(fēng)格: 封裝 / 箱體: |
| TSL230ARD-TR | 功能描述:光頻率和光電壓 Light to Frequency Converter RoHS:否 制造商:ams 峰值波長:1000 nm 工作電源電壓:5 V 最大工作溫度:+ 85 C 最小工作溫度:- 25 C 安裝風(fēng)格: 封裝 / 箱體: |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。