High resolution Conversion of Light Intensity to Frequency With No

61120
Mii
PROGRAMMABLE LIGHT-TO-FREQUENCY
CONVERTER
OPTOELECTRONIC PRODUCTS
DIVISION
Features:
Applications:
•
•
•
•
•
High resolution Conversion of Light Intensity to
Frequency With No External Components
Programmable Sensitivity and Full-Scale Output
Frequency
Advanced LinCMOSTM Technology
Single-Supply Operation Down to 2.7V,
with Power-Down Feature
•
•
Incorporates wide dynamic range, high-resolution light
measurement functions into a system using a singlecomponent 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 currentto-frequency converter on single 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 ±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°C to 70°C. Glass lens inhibits UV degradation.
ABSOLUTE MAXIMUM RATINGS
Storage Temperature............................................................................................................................................ .-25°C to +85°C
Operating Free-Air Temperature Range ............................................................................................................... -25°C to +70°C
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds.……......................…. ..................................................+260°C
Input Voltage Range, all inputs,VI................................................................................................................... -0.3 V to VDD +0.3 V
Supply Voltage – VDD ............................................................................................................................................................. 6.5V
Package Dimensions
8
7
6
Schematic Diagram
5
S0
1
8
S3
7
S2
PHOTODIODE
1
2
3
S1
4
2
TOP VIEW
PIN ONE
0.007 [0.18]
0.013 [0.33]
SIDE VIEW
3
GND
4
CURRENT TO FREQ.
CONVERTER
6
Vout
0.170 [4.32]MAX
0.280 [7.11]
0.310 [7.88]
0.320 [8.13]MAX
OE
5
0.020 [0.51] MIN
.020 [0.51] MAX
0.90 [2.28]
0.110 [2.80]
END VIEW
ALL DIMENSIONS ARE IN INCHES [MILLIMETERS]
MICROPAC INDUSTRIES, INC. OPTOELECTRONIC PRODUCTS DIVISION • 725 E. Walnut St., Garland, TX 75040 • (972) 272-3571 • Fax (972) 487-6918
www.micropac.com E-MAIL: [email protected]
Vcc
61120
PROGRAMMABLE LIGHT-TO-FREQUENCY CONVERTER
ELECTRICAL CHARACTERISTICS
Ta = -25°C, VDD = 5V unless otherwise specified.
PARAMETER
SYMBOL
UNITS
TEST CONDITIONS
V
IOH = -4 mA
0.26
V
IOL = 4 mA
IIH
1uA
uA
IIL
1uA
uA
High-Level Output Voltage
VOH
Low-Level Output Voltage
VOL
High-Level Input Current
Low-Level Input Current
MIN
TYP
4
4.3
MAX
0.17
Supply Current
NOTE
Power-on mode
Power-down mode
Full-Scale Frequency
1.1
MHz
Temperature Coef. Output Feq.
Supply Voltage Sensitivity
1
±100
ppm/°C
λ ≤ 700nm, -25°C ≤ TA ≤ 70°C
0.5
%/V
VDD = 5V ±10%
kSVS
OPERATING CHARACTERISTICS
Ta = 25°C, Vdd = 5V
PARAMETER
SYMBOL
TSL230
min
typ
0.8
Output
Frequency
0.8
1.2
0.1
10
1
1.2
0.13
10
1
1.2
0.5
10
125
550
tW
Nonlinearity
Recovery from
power down
Step response
to full-scale
input
Response
Time to
programming
change
Response
Time to
Output
Enable /(OE)
1
Min
TSL230B
typ
0.9
0.9
max
1
1.1
0.1
10
1
1.1
0.13
10
Min
typ
Max
0.95
UNITS
MHz
0.1
10
0.95
Hz
MHz
fO
0.8
Output Pulse
Duration
TSL230A
max
0.9
1
1.1
0.5
10
125
550
0.13
0.95
Hz
MHz
0.5
10
125
Hz
550
.5fo
.5fo
.5fo
±.1%
±.1%
±.1%
±.1%
±.1%
±.1%
±.1%
±.1%
±.1%
100
10
100
TEST CONDITIONS
NOTE
S0 = H,
S1 = S2 = S3 = L,
2
Ee = 130 mW/cm ,
λ p= 670 nm
Ee = 0, S0 = H,
S1 = S2 =S3 = L
S1 = H,
S0 = S2 = S3 = L,
2
Ee = 13 mW/cm ,
λ p= 670 nm
Ee = 0, S1 = H,
S0 = S2 =S3 = L
S0 = S1 = H,
S2 = S3 = L,
2
Ee = 1.3 mW/cm ,
λ p= 670 nm
Ee = 0, S0 = S1 = H,
S2 =S3 = L
S2 = S3 = H
S2 or S3 = H
%F.S.
fO = 0 Hz to 10 kHz
fO = 0 Hz to 100 kHz
fO = 0 Hz to 1 MHz
100
2
us
1 pulse of new frequency plus 1 us
3
2 periods of new principal frequency plus 1 us
50
150
50
150
50
150
ns
Note: 1. Full-scale freqency is the maximum operating of the device without saturation.
2. Nonlinearity is defined as the deviation of fO from a straight line between zero and full scale, expressed
as a percent of full scale.
3. Principal frequency is the internal oscillator frequency, equivalent to divide-by-1 output selection.
MICROPAC INDUSTRIES, INC. OPTOELECTRONIC PRODUCTS DIVISION • 725 E. Walnut St., Garland, TX 75040 • (972) 272-3571 • Fax (972) 487-6918
www.micropac.com E-MAIL: [email protected]
61120
PROGRAMMABLE LIGHT-TO-FREQUENCY CONVERTER
RECOMMENDED OPERATING CONDITIONS:
PARAMETER
Supply Voltage
High-Level Input Voltage
VDD = 4.5 V to 5.5 V
Low-Level Input Voltage
VDD = 4.5 V to 5.5 V
Operating free-air temperature range
SYMBOL
VDD
VIH
VIL
TA
MIN
2.7
2
0
-25
MAX
6
VDD
0.8
70
UNITS
V
V
V
°C
OPERATION INFORMATION
Terminal Functions
TERMINAL
NAME
NO.
GND
4
/OE
3
OUT
I/O
DESCRIPTION
Ground
I
Enable for fO (active low)
6
0
Scaled-Frequency (fO) output
S0, S1
1, 2
I
Sensitivity-select inputs
S2, S3
VDD
7, 8
5
I
fO scaling-select inputs
Supply Voltage
S1
S2
L
L
H
H
L
H
L
H
Selectable Options
Sensitivity
S3
S2 fO Scaling
(divide-by)
Power down
L
L
1
1x
L
H
2
10x
H
L
10
100x
H
H
100
TYPICAL CHARACTERISTICS
MICROPAC INDUSTRIES, INC. OPTOELECTRONIC PRODUCTS DIVISION • 725 E. Walnut St., Garland, TX 75040 • (972) 272-3571 • Fax (972) 487-6918
www.micropac.com E-MAIL: [email protected]