STMicroelectronics

Description

DESCRIPTION. The PS2501-1, -4 and PS2501L-1, -4 are optically coupled isolators containing a GaAs light emitting diode and an. NPN silicon phototransistor. The PS2501-1, -4 are in a plastic DIP (Dual In-line Package) and the PS2501L-1, -4 are lead bending type (Gull- wing) for surface mount. FEATURES. PS2501-1 DESCRIPTION. The PS2501-1, -2, -4 and PS2501L-1, -2, -4 are optically coupled isolators containing a GaAs light emitting diode and an NPN silicon phototransistor. The PS2501-1, -2, -4 are in a plastic DIP (Dual In-line Package) and the PS2501L-1, -2, -4 are lead bending type. (Gull-wing) for surface mount. FEATURES. Description. Transformers convert the LO and RF paths to balanced lines connecting to a medium barrier,. Schottky diode ring quad. These transformers help provide excellent isolation between ports. Conversion loss is low. The direct connection of the. IF port to the diode quad allows these mixers to be used as phase Recently, photocouplers have been supplanting relays and pulse transformers for complete noise elimination, level conversion, and high-potential isolation. Microproces- sor systems are requiring more and more photocouplers on the limited area of PC boards for I/O interface and other purposes. For these requirements Jul 17, 2012 R41 R43 R46 R47 R49 R50. R55 R56. 14. 1k . 1% 1/8W 25ppm. (anti-aliasing filter resistor). R2 R11 R12 R13 R14. 5. 10k . 5% 1/8W 100ppm. R3~R9, R16~ R22,. R25~R31. 21. 240k . 1% 1/8W 25ppm. LED. D1 D2 D3 D4. 4. -. -. SMT Optocoupler. U1 U2 U3 U4. 4. NEC2501 . -. Crystal. X1. 1. 16.384