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参数资料
| 型号： | S6986 |
| 元件分类： | 光电元器件 |
| 英文描述： | LOGIC OUTPUT PHOTO DETECTOR |
| 封装： | 4 PIN |
| 文件页数： | 2/4页 |
| 文件大小： | 315K |
| 代理商： | S6986 |
Light modulation photo IC
S4282-51, S6809, S6846, S6986, S7136/-10, S10053
s Electrical and optical characteristics (Ta=25
°C, Vcc=5 V)
S4282-51, S6986, S10053
S6809, S6846, S7136 /-10
Output: built-in pull-up resistor *2
Cathode: constant current drive
Output: open collector *3
Cathode: open collector drive
Parameter
Symbol
Condition
Min.
Typ.
Max.
Min.
Typ.
Max.
Unit
Supply voltage
Vcc
4.5
-
16
4.5
-
16
V
Current
consumption
Icc
Vo, LED
terminals open
-
4
11
-
4
11
mA
Low level
ou tpu t voltage
VOL
IOL=16 mA
-
0.2
0.4
-
0.2
0.4
V
4.9
-
V
Outpu
t
High level
output
voltage
VOH
4.7 k
between
Vcc and Vo
4.9
-
V
Low level
ou tpu t voltage
Vcath Icath=40 mA
-
0.8
V
Low level
ou tput c u rrent
Icath
Vcath=1.2 V
15
35
60
mA
Pulse cycle
Tp
65
130
220
65
130
220
s
Cath
ode
Pulse width
Tw
4
8
13.7
4
8
13.7
s
H
→L
Threshold
light level
EHL
λ=940 nm
No background light
-
0.7
2
-
0.2
1.0
W/mm2
0.45
0.65
0.95
Hysteresis
-
0.45
0.65
0.95
0.65
(S6809)
0.8
(S6809)
0.95
(S6809)
-
Frequency
response
f
0.5
1.25
-
0.5
1.25
-
kHz
Allowable
background
light level
Ex
Signal light: 5
W/ m m 2
λp=940 nm
Backgrou nd ligh t:
“A” ligh t so urce
5000
10000
-
2000
3000
-
lx
Vcc
CATHODE
(LED)
GND
Vcc
Vout
GND
Cathode
Output
10 k
*2:
*3:
Vcc
CATHODE
(LED)
GND
Vcc
Vout
GND
Cathode
Output
KPICC0009EA
KPICC0010EA
CONSTANT
VOLTAGE
BUFFER
SIGNAL
PROCESSING
CIRCUIT
TIMING
GENERATOR
OSCILLATOR
LED
DRIVER
OUTPUT
CIRCUIT
GND
CATHODE
(LED)
Vout
Vcc
COMPARATOR
PREAMP
PD
Vref
TRUTH TABLE
INPUT
OUTPUT LEVEL
LIGHT ON
LIGHT OFF
LOW
HIGH
s Block diagram and internal functions
(a) Oscillator and timing signal generator
The oscillator produces a reference oscillation output by charging and discharging the
built-in capacitor with constant current. The oscillation output is fed to the timing signal
generator, which then creates LED drive pulses and various timing pulses for digital
signal processing.
(b) LED driver circuit
This circuit drives an external LED using the LED drive pulses created by the timing
signal generator. The duty cycle is 1/16.
(c) Photodiode and preamplifier circuit
The photodiode is formed on the same monolithic chip. A photocurrent generated in the
photodiode is converted to a voltage by a preamplifier circuit. The preamplifier circuit
uses an AC amplifier to expand the dynamic range versus DC or low-frequency
background light, without impairing signal detection sensitivity.
(d) Capacitive coupling, buffer amplifier and reference voltage generator
Capacitive coupling removes low-frequency noise and also cancels the DC offset in
the preamplifier. The buffer amplifier boosts the signal up to the comparator level, and
the reference voltage generator produces a comparator level voltage.
(e) Comparator circuit
The comparator circuit has a hysteresis function to prevent chattering caused by
small fluctuations in the input light.
(f) Signal processing circuit
The signal processing circuit consists of a gate circuit and digital integrator circuit. The
gate circuit discriminates input pulses during synchronous detection, to prevent op-
erational errors caused by asynchronous background light. Background light which is
synchronized with the signal detection timing cannot be eliminated by the gate circuit,
but is canceled out by the digital integrator circuit at the latter stage.
(g) Output circuit
This circuit serves as an output buffer for the signal processing circuit and outputs the
signal to an external circuit.
KPICC0002EA
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