AMC1303E0510 Datasheet, PDF (20/40 Pages) Texas Instruments – Small, High-Precision, Reinforced Isolated Delta-Sigma Modulators with Internal Clock

AMC1303E0510, AMC1303M0510, AMC1303E0520, AMC1303M0520
AMC1303E2510, AMC1303M2510, AMC1303E2520, AMC1303M2520
SBAS771 – JUNE 2017
www.ti.com
Feature Description (continued)
8.3.3 Isolation Channel Signal Transmission
The AMC1303 uses an on-off keying (OOK) modulation scheme to transmit the modulator output bitstream
across the capacitive SiO₂-based isolation barrier. The transmitter modulates the bitstream at TX IN in Figure 39
with an internally-generated, 480-MHz carrier across the isolation barrier to represent a digital zero and sends a
no signal to represent the digital one. The receiver demodulates the signal after advanced signal conditioning
and produces the output. The symmetrical design of each isolation channel improves the CMTI performance and
reduces the radiated emissions caused by the high-frequency carrier. Figure 39 shows a block diagram of an
isolation channel integrated in the AMC1303.
Transmitter
Receiver
TX IN
OOK
Modulation
TX Signal
Conditioning
SiO2-Based
Capacitive
Reinforced
Isolation
Barrier
RX Signal
Conditioning
Envelope
Detection
RX OUT
Oscillator
Figure 39. Block Diagram of an Isolation Channel
Figure 40 shows the concept of the on-off keying scheme.
TX IN
Carrier signal across
the isolation barrier
RX OUT
Figure 40. OOK-Based Modulation Scheme
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