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High power speaker amp ICs are optimised for autonomous driving

Thu, Apr 23, 2020

AEC-Q100-qualified 2.8W output Class AB monaural speaker amplifiers from Rohm Semiconductor are intended for instrumental clusters in vehicles equipped with autonomous driving and advanced driving assistance systems (ADAS).

The BD783xxEFJ-M series (BD78306EFJ-M, BD78310EFJ-M and BD78326EFJ-M)
have been developed for vehicle clusters where various sound outputs at high volume, including warning sounds, turn signals, welcome tones and voice guidance are required. They use a new type of over-current protection (OCP) circuit to protect against output shorts to deliver high 2.8W output, which was difficult to achieve in the past, reports Rohm. In addition to over-current protection, built-in thermal shutdown and under-voltage lock out (UVLO) ensure high reliability protection against abnormal conditions.

The amplifiers can withstand high temperature operation up to 105 degrees C to enable stable voice output without compromising functionality even under severe conditions, Rohm said.

With conventional over current protection circuits, the maximum output is limited, since the operating threshold of the protection circuit must be set to a value smaller than the maximum current the speaker amp can provide. Rohm’s over-current protection circuit eliminates the need to limit the output by preventing waveform distortion even at high output. The BD783xxEFJ-M series provides over-current protection from output shorts with 2.8W maximum output at 4Ohm load and 10 per cent distortion.

The BD783xxEFJ-M series is qualified to withstand automotive reliability standard AEC-Q100 and the power package reduces heat generation even at high volumes, resulting in stable audio output. In addition to over-current protection, thermal shutdown and under-voltage lock-out are built-in, preventing damage caused by abnormal heat generation and unexpected popping (cracking) noise during battery interruptions.

ROHM’s BD783xxEFJ-M series speaker operational amps are mounted on Cypress Semiconductor’s Traveo Cluster microcontroller family S6J3360 series evaluation board for automotive applications.

Rohm offers output gains of +6dB (BD78306EFJ-M), +10dB (BD78310EFJ-M), and +26dB (BD78626EFJ-M). The range will be expanded to include a total of 11 models ranging from +6dB to +26dB in 2dB steps.

http://www.rohm.com/eu

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Microchip releases latest version of 5G timing software

Wed, Apr 22, 2020

Microchip has released Version 2.1 of its TimeProvider 4100 timing grandmaster, equipped with gateway clock and what is claimed to be the fastest high-performance boundary clock to enhance 5G mobile network phase protection.

It is designed to help 5G mobile providers, cable operators and utility providers ensure phase delivery, protection and synchronisation even when the Global Navigation Satellite System (GNSS) is offline, jammed or spoofed.

The TimeProvider 4100 is a 1588 grandmaster with support for the latest ITU-T G.8275.1 and G.8275.2 1588 phase profiles. There is also an extensive port fan-out for PTP, network time protocol (NTP), SyncE, and E1/T1.

This software release builds on earlier versions by adding key software enhancements providing a virtual primary reference time clock (vPRTC). Virtual PRTC provides the ability to design a redundant precise time distribution architecture for phase protection over an optical network.

The main source of precise time is the Global Positioning System (GPS) and regional constellations that comprise the GNSS. Deployment of GNSS, however, can be expensive, due to the cost of upgrading to GNSS-capable receivers and antennae as well as increasing densification of end points. Telecomms, cable and utility operators deploy vPRTC where GNSS dependency is reduced or eliminated.

Using vPRTC leverages the existing optical network, thus avoiding expensive dark fibre expenses, it also uses a dedicated lambda to transport time precisely and securely and provides a redundant source of time through enhanced PRTC (ITU-T G.8272.1). It also allows bi-directional, precise time flows (east and west) and links together high-precision, multi-domain, high-performance boundary clocks that meet T-BC Class D, as defined by ITU-T G.8273.2.

Microchip’s vPRTC multi-domain architecture provides a high-performance, redundant, sub-five nanosecond distribution of precise time over regional and national networks.

Release 2.1 also introduces Network Time Protocol daemon (NTPd) with Message Digest (MD5) security algorithm.

TimeProvider4100 2.1 meets PRTC-B performance standards (per ITU-T G.8272) and supports 1G and 10G, NTP and PTP in a single form-factor system.

It is available now for both new and already deployed systems.

http://www.microchip.com

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Routers and software for IoT and 5G signage

Wed, Apr 22, 2020

Routers and software announced by Digi International address IoT connectivity and 5G for retail, digital signage, transportation and smart cities.

The new releases are the Digi TX54 and Digi TX64, the initial products in the TX line of transportation and intelligent traffic system routers. There is also the Digi EX12 cellular extender which joins the Digi EX15 for indoor signage, retail and food service applications.

Digi’s portfolio now has routers that include 5Ge / Gigabit LTE (Cat 18) radios, Band 71 and CBRS connectivity, 5G readiness, and are FirstNet Ready.

Supported devices can also use the Digi Core plug-in module, to adapt to the LTE standard.

Digi’s TX54, TX64 and EX12 are all built on Digi Accelerated Linux (DAL). This secure operating system adds multi-casting, expands routing protocols, and – critical for transportation applications – offers dual APN capabilities and supports dynamic DNS updates.

They also all share Edge Compute, which combined with the integral Python, allows users to add intelligence on the device. This can be from simple scripts to IoT applications.

They all also have Digi Remote Manager for centralised device deployment, monitoring and control. With Digi Remote Manager, organisations can automate firmware, software and configuration updates of all units in the field for asset tracking and compliance, including security protection. It is also available as an Android or iPhone mobile app.

Digi TrustFence is a built-in security framework, which protects internal and external I/O ports to prevent unwanted local intrusion. Digi TrustFence also provides data authentication and device identity management options. It uses the latest encryption protocols for data in motion and over-the-air (OTA) transmissions to ensure the integrity of data flowing across a network.

Designed for transportation, intelligent traffic system (ITS), and public safety applications, the Digi TX54 and Digi TX64 can be used in traffic systems for traffic monitoring and optimisation for connected and even self-driving vehicles, in the future. Dual cellular and dual Wi-Fi makes them suitable for on-transit-vehicle connectivity; eliminating network downtime with immediate cellular failover and providing simultaneous, firewalled passenger and administrator connectivity.

Additionally, the Digi TX64 with its dual Gigabit LTE (Cat 18) radios is ready for 5G as part of AT&T’s 5G rollout. This industrial computer has a Quad-core 1.9GHz processor, with added routing capabilities. It can be used for onsite camera monitoring, emergency response kits, and Wi-Fi for on-board transit applications, in addition to file streaming and storage.

The EX12 is Digi’s most affordable cellular extender for low to medium bandwidth applications, including business continuity, point of sale, and digital signage connectivity in retail and primary LTE connectivity in kiosks, ATMs, and lottery machines.

The TX54 and TX64 are available now. The EX12 will be available by this summer.

http://www.digi.com

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Chipset family supports 6GHz spectrum for Wi-Fi 6E

Wed, Apr 22, 2020

Equipped with an architecture designed to maximise use of the 6GHz band, the QCS-AX2 chipset family is optimised for high-throughput Wi-Fi applications, such as access points, gateways, and mesh networking solutions for dense environments and under-served areas, says ON Semiconductor.

The QCS-AX2 supports the 6GHz spectrum band based on the enhanced Wi-Fi 6E standard. The chipset is built on an integrated baseband and RF architecture that supports key Wi-Fi 6E features, such as orthogonal frequency division multiple access (OFDMA), advanced multi-user, multi-input, multi-output (MU-MIMO), 160MHz channel support for faster speeds and SmartScan channel selection.

The family consists of the QCS-AX2-A12, tri-band (6GHz/5GHz/2.4GHz) with AdaptivMIMO technology. It supports flexible 8×8 or 4×4 configurations, the QCS-AX2-T12, a tri-band concurrent 4×4 operation for high performance, cost-effective router solutions, says ON Semiconductor, and the QCS-AX2-T8, a tri-band concurrent eight-stream configuration for mesh nodes and mainstream access points.

The Federal Communications Commission anticipates the opening of the 6GHz band in the US later this year, with up to 1,200MHz of newly available spectrum to be designated for Wi-Fi and other unlicensed use. With almost five times more spectrum than the current 2.4 GHz and 5GHz bands combined, the 6GHz band is accelerating the development of Wi-Fi 6 applications. The 6GHz client ecosystem will take time to build but the Wi-Fi infrastructure devices, such as gateways, routers, and access points will need to continue to support existing dual band (2.4GHz/5GHz) clients.

ON Semiconductor’s Wi-Fi 6E products accommodate the transition to the 6GHz band with AdaptivMIMO technology. A Wi-Fi 6E infrastructure device with AdaptivMIMO allows the network to operate in the 5GHz or 6GHz band depending on the clients present in a subscriber’s home network to maximise performance, coverage, and utilisation. The QCS-AX2 series provides the Wi-Fi performance and connectivity in congested environments to multiple devices that applications demand.

ON Semiconductor is now sampling the QCS-AX2 solutions to customers.

http://www.onsemi.com

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High power speaker amp ICs are optimised for autonomous driving

Microchip releases latest version of 5G timing software

Routers and software for IoT and 5G signage

Chipset family supports 6GHz spectrum for Wi-Fi 6E

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