Embedded Systems Conference
Breaking News
Comments
Oldest First | Newest First | Threaded View
goafrit
User Rank
Author
MEMS Noise
goafrit   7/6/2014 3:57:20 PM
NO RATINGS
>> Knowles claims its world's lowest-power MEMS mic with a signal-to-noise (SNR) of 64.3 dB measures just 3.50 x 2.65 x 0.98 millimeters. (Source: Knowles)

It is fair to say that Knowles could be right. They are the industry leading mic MEMS maker. Though ST takes the bulk of the business because of its scale and business with Apple, Knowles does a lot of great works in this space.

DrFPGA
User Rank
Author
Serial PDM
DrFPGA   7/6/2014 5:37:33 PM
NO RATINGS
Too bad its not a moe standard interface. Perhaps this would increase power requirements? If so, maybe we need a new very low power seial interface standard....

R_Colin_Johnson
User Rank
Author
Re: MEMS Noise
R_Colin_Johnson   7/6/2014 9:33:58 PM
NO RATINGS
Knowles has a 59 percent share of the global market according to IHS and has two mics in the iPhone5s according to Yoles.

R_Colin_Johnson
User Rank
Author
Re: Serial PDM
R_Colin_Johnson   7/9/2014 7:26:22 PM
NO RATINGS
I finally got an answer as to why they use PDM. Here's what they say:

"We selected the PDM interface based on our experience working with major OEMs around the world and the industry's adoption of PDM as the standard microphone interface. Within the analog-to-digital conversion, the PDM interface allows the microphone to contain the entire analog process with a digital output to the Codec or application processor. A digital output from the microphone enables the Codec and application processor to be more efficient in terms of size, scale, and power consumption. This also helps eliminates the need for a high power analog-to-digital converter between the microphone and the Codec or application processor."

goafrit
User Rank
Author
Re: MEMS Noise
goafrit   7/9/2014 8:34:04 PM
NO RATINGS
>> Knowles has a 59 percent share of the global market according to IHS and has two mics in the iPhone5s according to Yoles.

Makes sense because I knew when we struggled in the industry to get pass the IPs Knowles has in MEMS micr. They have eaten the launch in this sector and will continue to stay on top unless they blow it. It is like in XL, there is one patent ST has in charge pump that enables you to ramp up  voltage that makes everyone struggle.

DrFPGA
User Rank
Author
Re: Serial PDM
DrFPGA   7/9/2014 10:56:51 PM
NO RATINGS
Thanx for the follow-up. Looks like they target the high volume (application processor) market so PDM makes sense...



Radio
LATEST ARCHIVED BROADCAST
Overview: Battle-hardened veterans of the electronics industry have heard of the “connected car” so often that they assume it’s a done deal. But do we really know what it takes to get a car connected and what its future entails? Join EE Times editor Junko Yoshida as she moderates a panel of movers and shakers in the connected car business. Executives from Cisco, Siemens and NXP will share ideas, plans and hopes for connected cars and their future. After the first 30 minutes of the radio show, our listeners will have the opportunity to ask questions via live online chat.
Flash Poll
Like Us on Facebook

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
Special Video Section
LED lighting is an important feature in today’s and future ...
Active balancing of series connected battery stacks exists ...
After a four-year absence, Infineon returns to Mobile World ...
A laptop’s 65-watt adapter can be made 6 times smaller and ...
An industry network should have device and data security at ...
The LTC2975 is a four-channel PMBus Power System Manager ...
In this video, a new high speed CMOS output comparator ...
The LT8640 is a 42V, 5A synchronous step-down regulator ...
The LTC2000 high-speed DAC has low noise and excellent ...
How do you protect the load and ensure output continues to ...
General-purpose DACs have applications in instrumentation, ...
Linear Technology demonstrates its latest measurement ...
10:29
Demos from Maxim Integrated at Electronica 2014 show ...
Bosch CEO Stefan Finkbeiner shows off latest combo and ...
STMicroelectronics demoed this simple gesture control ...
Keysight shows you what signals lurk in real-time at 510MHz ...
TE Connectivity's clear-plastic, full-size model car shows ...
Why culture makes Linear Tech a winner.
Recently formed Architects of Modern Power consortium ...
Specially modified Corvette C7 Stingray responds to ex Indy ...