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Incorporates wide dynamic range, high-resolution light
measurement functions into a system using a single-
component solution
Communicates directly With a Microcontrollers
eliminating the need for A/D converters
Determines the clarity of the liquid
DESCRIPTION
The 61120 programmable light-to-frequency converter combines a configurable silicon photodiode and a current-to-
frequency converter on sigil monolithic CMOS integrated circuits. The output can be either a pulse train or a square wave
(50% duty cycle) with frequency directly proportional to light intensity. The sensitivity of the device is selectable in three
ranges, providing two decades of adjustment. The full-scale output frequency can be scaled by one of four preset values.
All inputs and the output are TTL compatible, allowing direct two-way communication with a microcontroller for
programming and output interface. An output enable /(OE) is provided that places the output in the high-impedance state
for multiple-unit sharing of a microcontroller input line. The device is available with absolute-output-frequency tolerance of
鹵20%.
Its circuit has been temperature compensated for the ultraviolet-to-visible-light range of 300nm to 700nm. The
device is characterized for operation over the temperature range of -25擄C to 70擄C. Glass lens inhibits UV degradation.
ABSOLUTE MAXIMUM RATINGS
Storage Temperature ............................................................................................................................................ .-25擄C to +85擄C
Operating Free-Air Temperature Range................................................................................................................ -25擄C to +70擄C
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds.鈥︹€?.....................鈥? . .................................................+260擄C
Input Voltage Range, all inputs, V
I
..................................................................................................................-0.3 V to V
DD
+0.3 V
Supply Voltage 鈥?V
DD
.......................................................... ................................................................................................ .. 6.5V
Package Dimensions
8
7
6
5
Schematic Diagram
S0
1
PHOTODIODE
8
S3
1
2
3
4
S1
2
7
S2
TOP VIEW
OE
0.170 [4.32]MAX
0.320 [8.13]MAX
0.280 [7.11]
0.310 [7.88]
PIN ONE
0.007 [0.18]
0.013 [0.33]
0.90 [2.28]
0.110 [2.80]
END VIEW
3
CURRENT TO FREQ.
CONVERTER
6
Vout
GND
0.020 [0.51] MIN
.020 [0.51] MAX
4
5
Vcc
SIDE VIEW
ALL DIMENSIONS ARE IN INCHES [MILLIMETERS]
MICROPAC INDUSTRIES, INC. OPTOELECTRONIC PRODUCTS DIVISION
鈥?/div>
725 E.Walnut St., Garland, TX 75040
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(972) 272-3571
鈥?/div>
Fax (972) 487-6918
www.micropac.com
E-MAIL: OPTOSALES @ MICROPAC.COM
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