Chip sets in sigma 350 family

Hello,

The "Sigma xxx" is a model number so it doesn't necessarily refer to the core rate. Rather it identifies a "family" of parts which share some common features, similar internal architecture, as well as the compiler which SigmaStudio brings in to crunch your schematic into instruction code. The Sigma100 chips include the ADAU1701, which runs at just under 50 MHz. These chips cannot branch so unused instructions are NOPs. They have a simple code structure such that a microcontroller can boot them with just a few block writes. The Sigma200 chips (ADAU144x) introduced branching and some code optimization, with a 172 MHz core rate. The Sigma300 (ADAU145x) brings 300 MHz with SIMD architecture which, for example, drastically reduces the instruction count of high-order filters. They also feature a wider (8.24) data path and block processing capability. Sigma350 has the same core as the Sigma300 -- it's even instruction code compatible. It adds features such as more delay memory. Which to use often depends both on MIPS rate and features like self-boot, GPIOs, SRCs, built-in converters, power usage, etc.

Best regards,

Bob

Thanks for the details, Bob.

Actually, where we can get this details of which series of chips, belongs to which 'Sigma xxx' model. Other than in this forum (Engineer zone). We have verified in analog website in the below link.Here it is mentioned as ADAU1462 & 1463 as ''ADAU1462/1463-300''. Hence we thought ADAU146x series also belongs to Sigma300. Please clarify.

https://www.analog.com/en/parametricsearch/11310

Regards,

Kalaiselvi

ADAU145x = Sigma300
ADAU146x = Sigma350

Like Bob said, they're very closely related and can mostly be viewed as the same family. The designation is not related to clock speed (the fact that the Sigma300 processors ran at up to 300 MHz is just coincidence).

The following parts are 150 MHz:
ADAU1450
ADAU1462-150
ADAU1463-150

The following parts are 300 MHz:
ADAU1451
ADAU1452
ADAU1462-300
ADAU1463-300
ADAU1466
ADAU1467

Thanks for the details.

Regards,

Kalaiselvi

Hello All,

For a peek from the inside of the company... Since the 146x parts did not have a change in the core architecture or the core rates, we could not call it the next generation of Sigma, the Sigma400, But there were some significant additions to the peripherals around the core so we thought of it as a half of a generation change and so the Sigma350 was born! It is half way to a Sigma400.

They were designed to be backwards compatible and for the most part they are. I often run code for either processors on either eval board and as long as you do not try to use something that the hardware does not have it works.

Dave T