Each consisting of a photodiode and preamplifier assembled on a lead frame, the receivers are specified to operate from 2.5V to 5.5V, with a low 0.35 mA supply current at 3.3V. The devices’ epoxy package — measuring 6.0 x 6.9 x 5.6 mm — acts as an IR band pass filter for use with inexpensive 940 nm IR LEDs.
Continuous data transmission of up to 7.8 kbps over a range up to 35 meters is achieved by using amplitude-shift keyed (ASK) on-off modulated 38.4 kHz or 57.6 kHz signals from an emitter with a 250 mW/sr irradiance. The receivers provide shielding against EMI, immunity against ambient light, and are insensitive to supply voltage ripple and noise from CFL lamps.
Using IR components such as the TSDP34138/56 and TSDP34338/56, as opposed to RF transmission, simplifies designs, lowers costs, and eliminates the need to obtain regulatory approvals. In addition, by requiring line-of-sight, IR enhances privacy and minimizes interference with adjacent systems.
Both devices are RoHS-compliant, halogen-free, and Vishay GREEN. Samples and production quantities of the new TSDP34138/56 and TSDP34338/56 are available now, with lead times of six to eight weeks.
