AMC3302 datasheet(12/24 Pages) TI

12 / 24 page

7.3.2 Data Isolation Channel Signal Transmission

The AMC3302 uses an on-off keying (OOK) modulation scheme to transmit the modulator output bitstream

across the capacitive SiO2-based isolation barrier. Figure 7-1 shows the block diagram of an isolation channel.

The transmitter modulates the bitstream at TX IN with an internally generated, 480-MHz carrier and sends a

burst 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 common-mode transient immunity (CMTI)

performance and reduces the radiated emissions caused by the high-frequency carrier.

TX IN

Oscillator

OOK

Modulation

Transmitter

TX Signal

Conditioning

Envelope

Detection

RX Signal

Conditioning

Receiver

RX OUT

SiO2-Based

Capacitive

Reinforced

Isolation

Barrier

Figure 7-1. Block Diagram of a Data Isolation Channel

Figure 7-2 shows the concept of the OOK scheme.

TX IN

Carrier Signal Across

the Isolation Barrier

RX OUT

Figure 7-2. OOK-Based Modulation Scheme

7.3.3 Analog Output

The AMC3302 offers a differential analog output comprised of the OUTP and OUTN pins. For differential input

voltages (VINP – VINN) in the range from –50 mV to 50 mV, the device provides a linear response with a nominal

gain of 8.2. For example, for a differential input voltage of 250 mV, the differential output voltage (VOUTP –

VOUTN) is 2.05 V. At zero input (INP shorted to INN), both pins output the same common-mode output voltage

VCMout, as specified in the Electrical Characteristics table in Section 6. For absolute differential input voltages

greater than 250 mV but less than 320 mV, the differential output voltage continues to increase in magnitude but

with reduced linearity performance. The outputs saturate at a differential output voltage of VCLIPout as shown in

Figure 7-3 if the differential input voltage exceeds the VClipping value.

AMC3302

SBASA11 – AUGUST 2020

www.ti.com

Submit Document Feedback

Product Folder Links: AMC3302

AMC3302 Datasheet(PDF) 12 Page - Texas Instruments

AMC3302 Datasheet(HTML) 12 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

Datasheet Download

Link URL