AMC1306E05_017 Datasheet, PDF (23/38 Pages) Texas Instruments – Small, High-Precision, Reinforced Isolated Delta-Sigma Modulators with High CMTI

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AMC1306E05, AMC1306E25, AMC1306M05, AMC1306M25
SBAS734A – MARCH 2017 – REVISED JULY 2017
Feature Description (continued)
8.3.3 Isolation Channel Signal Transmission
The AMC1306 device 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 49 with an internally-generated, 480-MHz carrier across the isolation barrier to represent a digital one and
sends a no signal to represent the digital zero. 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. The block diagram of an
isolation channel integrated in the AMC1306 is shown in Figure 49.
Transmitter
Receiver
TX IN
OOK
Modulation
TX Signal
Conditioning
SiO2-Based
Capacitive
Reinforced
Isolation
Barrier
RX Signal
Conditioning
Envelope
Detection
RX OUT
Oscillator
Figure 49. Block Diagram of an Isolation Channel
Figure 50 shows the concept of the on-off keying scheme.
TX IN
Carrier Signal Across
the Isolation Barrier
RX OUT
Figure 50. OOK-Based Modulation Scheme
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