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TSL230BRD-TR Datasheet(PDF) 7 Page - List of Unclassifed Manufacturers |
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TSL230BRD-TR Datasheet(HTML) 7 Page - List of Unclassifed Manufacturers |
7 / 15 page TSL230RD, TSL230ARD, TSL230BRD PROGRAMMABLE LIGHT-TO-FREQUENCY CONVERTERS TAOS054P − OCTOBER 2007 6 r r Copyright E 2007, TAOS Inc. The LUMENOLOGY r Company www.taosinc.com 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 TSL230RD device package. A low-noise power supply is required to minimize jitter on output pulses. Device Operational Details The frequency at the output pin (OUT) is given by: fO = fD + (Re) (Ee) where: fO is the output frequency fD is the output frequency for dark condition (Ee = 0) Re is the device responsivity for a given wavelength of light given in kHz/(μW/cm2) Ee is the incident irradiance in μW/cm2 fD 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 fO. At very low light levels, this dark frequency can be a significant portion of fO. The dark frequency is temperature dependent. For optimum performance of any given device over the full output range, the value of fD should be measured (in the absence of light) and later subtracted from subsequent light measurement (see Figure 1). Input Interface A low-impedance electrical connection between the device OE pin and the device GND pin is required for improved noise immunity. 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. Sensitivity Adjustment Sensitivity is controlled by two logic inputs, S0 and S1. Sensitivity is adjusted using an electronic iris technique — effectively an aperture control — to change the response of the device to a given amount of light. The sensitivity can be set to one of three levels: 1×, 10×, or 100×, providing two decades of adjustment. This allows the responsivity of the device to be optimized to a given light level while preserving the full-scale output-frequency range. Changing of sensitivity also changes the effective photodiode area by the same factor. |
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