AD2420(W)/AD2426(W)/AD2427(W)/AD2428(W)/AD2429(W)

Rev. B

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Page 17 of 38

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January 2020

Parameter

System Specification

Cable

Unshielded, single, twisted pair wire (UTP) with 100 Ω differential impedance. EMC performance

and full functionality under worst-case environmental conditions is confirmed with Leoni Dacar

545 cable (76D00305).

Maximum Cable Length

AD2428(W)Mastered System

40 m total, 15 m between nodes.

AD2429(W) Mastered System

10 m total, 5 m between nodes.

Maximum Number of Nodes

AD2428(W) Mastered System

11 nodes (1 master node and 10 slave nodes).

AD2429(W) Mastered System

Three nodes (1 master node and 2 slave nodes).

Maximum Number of Audio Slots

64 total, up to 32 upstream and 32 downstream slots, depending upon system design.

AD2420(W)/AD2429(W)1

AD2429(W): 4 upstream and 2 downstream slots, depending upon system design.



AD2420(W): 2 upstream slots, depending upon system design.

Number of Audio Channels per Slave Node Individually programmable 0 to 32 upstream channels and 0 to 32 downstream channels.

Upstream and downstream can choose different slot sizes. 12-, 16-, or 20-bit slot sizes can carry

Audio Sampling Frequency

44.1 kHz to 48 kHz. All nodes sample synchronously. Slave node transceivers support sample rates

To support 2× and 4× sampling rates in slaves, the master uses two and four times the number of

I

Transceivers also support reduced rate sampling for 24 kHz, 12 kHz, 6 kHz, 4 kHz, 3 kHz, 2.4 kHz,



2 kHz, 1.71 kHz, or 1.5 kHz at a low latency 48 kHz superframe rate.

Discovery Time

Less than 35 ms per node. Much less than 350 ms for total system startup in a system with 10 nodes.

Includes register initialization.

Bit Error Detection

Robust error detection for control data and status data with 16-bit cyclic redundancy check (CRC).

Error Correction

Parity and line code error detection on synchronous data slots with audio error correction (repeat

of last known good data).

For 24-bit and 32-bit data channels, single error correction and double error detection (SECDED) of

synchronous data slots is possible.

Failure Diagnostics1

positive terminal of car battery), shorted to ground, wires shorted to each other, wires reversed or

open connection.

System EMI/EMC

Meets or exceeds industry specifications for robustness (ISO 11452-2, ISO 11452-4,

ISO 7637-3) and emissions (CISPR25).

System ESD

See IEC ESD ratings in Table 12 for terminals.