- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄373348 > S4289-61 (Hamamatsu Photonics) Light modulation photo IC Asynchronous type light modulation PDF資料下載
參數(shù)資料
| 型號： | S4289-61 |
| 廠商： | Hamamatsu Photonics |
| 英文描述： | Light modulation photo IC Asynchronous type light modulation |
| 中文描述： | 光調(diào)制照片集成電路異步式光調(diào)制 |
| 文件頁數(shù)： | 3/4頁 |
| 文件大?。?/td> | 203K |
| 代理商： | S4289-61 |
Light modulation photo IC
S4289-61
CONSTANT
BUFFER
SIGNAL
PROCESSING
CIRCUIT
TIMING
GENERATOR
OSCILLATOR
OUTPUT
CIRCUIT
GND
CATHODE
(LED)
Vout
Vcc
COMPARATOR
Vref
PREAMP
PD
TRUTH TABLE
INPUT
OUTPUT LEVEL
LIGHT ON
LIGHT OFF
LOW
HIGH
I
Block diagram and internal functions
(a) Oscillator and timing signal generator
The oscillator produces a reference oscillation output by charg-
ing 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) Photodiode and preamplifier circuit
The photodiode is formed on the same monolithic chip. A photo-
current 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 back-
ground light, without impairing signal detection sensitivity.
(c)
Capacitive coupling, buffer amplifier and reference voltage generator
Capacitive coupling removes low-frequency noise and also can-
cels 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.
(d) Comparator circuit
The comparator circuit has a hysteresis function to prevent chat-
tering caused by small fluctuations in the input light.
(e) Signal processing circuit
The signal processing circuit consists of a digital integrator circuit
that eliminates non-continuous, synchronous background light.
(f) Output circuit
This circuit serves as an output buffer for the signal processing
circuit and outputs the signal to an external circuit.
Note: The cathode (LED) terminal should be grounded.
KPICC0040EA
I
Handling precautions
Synchronous mode acquires signals in synchronization with the LED emission timing. In asynchronous mode, a time window
is provided which opens at a certain cycle to acquire signals, and the LED frequency is set so that at least one signal enters the
time window while open. Since this time window for signal acquisition is wider when compared with synchronous mode
operation, the asynchronous mode is less capable of eliminating disturbance background light at high frequencies or in
pulsed form (noise light). However, asynchronous mode has the advantage of not requiring any wiring in order to synchronize
the LED with the photo IC.
S4289-61 exhibits the same characteristics as S7136 series light modulation photo IC except for synchronous detection. To
use S4289-61, the cathode (LED) terminal should be grounded and the LED operated by an external driver circuit.
相關PDF資料 |
PDF描述 |
|---|---|
| S42WD61S2.7P | Dual Voltage Supervisory Circuit With Watchdog Timer |
| S4242 | Dual Voltage Supervisory Circuit With Watchdog Timer |
| S4242P2.7P | Dual Voltage Supervisory Circuit With Watchdog Timer |
| S4242P2.7S | Dual Voltage Supervisory Circuit With Watchdog Timer |
| S4242PAP | Dual Voltage Supervisory Circuit With Watchdog Timer |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| S428A1000000 | 制造商:Veeder-Root Company 功能描述: |
| S428A1110020 | 制造商:Veeder-Root Company 功能描述: |
| S428A2110100 | 制造商:Veeder-Root Company 功能描述: |
| S428A3100020 | 制造商:Veeder-Root Company 功能描述: |
| S428A3111000 | 制造商:DANAHER SPECIALTY PRODUCTS 功能描述:PROCESS METER, DCMA, RELAY OUTPUT |
發(fā)布緊急采購，3分鐘左右您將得到回復。