TSL220 Datasheet, PDF (1/10 Pages) Texas Instruments – LIGHT-TO-FREQUENCY CONVERTER

TSL220
LIGHT-TO-FREQUENCY CONVERTER
SOES003 – AUGUST 1990 – REVISED JUNE 1991
D High-Resolution Conversion of Light Intensity to Frequency
D Wide Dynamic Range . . . 118 dB
D Variable (and Single) Supply Range . . . 5 V to 10 V
D High Linearity . . . Typically Within 2% of FSR (C = 100 pF)
D High Sensitivity . . . Can Detect Change of 0.01% of FSR
D CMOS Compatible Output for Digital Processing
D Minimum External Components
D Microprocessor Compatible
description
The TSL220 consists of a large-area photodiode and a current-to-frequency converter. The output voltage is
a pulse train and its frequency is directly proportional to the light intensity (irradiance) on the photodiode. The
output is CMOS^† compatible and its frequency may be measured using pulse counting, period timing, or
integration techniques. The TSL220 is ideal for light-sensing applications requiring wide dynamic range, high
sensitivity, and high noise immunity. The output frequency range is determined by an external capacitor; hence,
the desired output frequency is adjustable for a given light intensity at the input. The TSL220 is characterized
for operation over the temperature range of – 25°C to 70°C.
mechanical data
The photodiode and current-to-frequency converter are packaged in a clear plastic 8-pin dual-in-line package.
The active chip area is typically 4,13 mm² (0.0064 in²).
PIN 1 NC
PIN 2 OUTPUT
PIN 3 VCC
PIN 4 C2
PIN 5 GND
PIN 6 C1
PIN 7 NU
PIN 8 NU
NC–No internal connection
NU–Not usable (leave unconnected)
0,6 (0.024)
0,4 (0.016)
6,5 (0.256)
6,3 (0.248)
7°
TYP
7,82 ± 0,13
(0.308 ± 0.005)
9,2 (0.362)
8,7 (0.343)
43 21
Location of
Photodiode
Center
CL
0,8 (0.031) R NOM
56 7
CL
0,84 (0.033) MIN
8
2,4 (0.094)
1,9 (0.075)
1,6 (0.063)
1,4 (0.055)
7° MAX
TYP
5,6 (0.220)
5,4 (0.213)
105°
90°
8 Places
9,5 (0.374)
MAX
Seating Plane
0,30 (0.012)
0,23 (0.009) _{0,85 (0.033)}
0,45 (0.018)
3,4 (0.134)
3,2 (0.126)
0,56 (0.022)
0,36 (0.014)
2,54 ± 0,10
(0,100 ± 0.004)
ALL LINEAR DIMENSIONS ARE IN MILLIMETERS AND PARENTHETICALLY IN INCHES
† _{Use of LSTTL logic families may require a 3300-Ω pulldown resistor on the output.}
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright © 1991, Texas Instruments Incorporated
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