K
A
Figure 3.5.15.1 LM431A outside drawing
3.5.16 Function introduction to HS817
U502 (HS817) is a photoelectric coupler, shown as the figure 3.5.16.1.The right side is a light emitting
diode, which sends out light of different intensity according to the strength of voltage inputted from the right
side, generates photocurrent of different intensity on the left side according to light of different intensity, and
outputs from position D. The higher of the voltage inputted from the right side, the stronger of the light emitted
from light emitting diode and the larger of the photocurrent produced from position D. The lower of the voltage
inputted from the right side of photoelectric coupler, the weaker of the light emitted from light emitting diode
and the weaker of the current outputted from position D.
Figure 3.5.16.1 Hs817 outside drawing
3.5.17 Function introduction to Pt2579
1. Description
PT2579 is a Radio Data System Demodulator IC utilizing CMOS Technology specially designed for radio
data system applications. The RDS data signal (RDDA) and the RDS clock signal (RDCL) are provided
as outputs for further processing by an ideal decoder / microcontroller. Anti-aliasing Filter (2
nd
order), 57kHz
band pass filter (8th order), reconstruction filter (2nd order), clocked comparator with automatic offset
compensation, biphase symbol decoder, differential decoder, signal quality detector are all built into a single
chip having the highest performance and reliability. Pin assignments and application circuit are optimized for
easy PCB layout and cost saving advantages.
.2. Features
# CMOS Technology
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