EDN, May 26, 2011

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PRYING EYES BRIAN DIPERT • SENIOR TECHNICAL EDITOR PRY FURTHER AT EDN.COM Go to www.edn.com/pryingeyes for past Prying Eyes write-ups. + The HTC Surround: achieving differentiation through enhanced sound so far been slow, Nokia in February 2011 announced its plans to anoint Microsoft's operating system as the successor to both Nokia's Symbian and the Nokia/Intel MeeGo, which should notably accel- erate market-share growth. In partnership with iFixit, EDN takes a look at a first-generation WP7 handset, the HTC Surround, to assess both current platform status and future potential enhance- ments (see "HTC Surround Teardown," iFixit, http://bit.ly/e2YSpI). T rumpeting its resurrection in mobile operating systems, Microsoft introduced the Windows Phone 7 operat- ing system at the 2010 Mobile World Congress show. The company followed up with supporting hardware in October 2010. Although Windows Phone 7 uptake has After a cursory inspection of the front side of the lower PCB, you may think you're rereading an earlier EDN article (see "The Nexus One: Google hits a smartphone home run," EDN, Feb 17, 2011, pg 24, http://bit. ly/hm4KTo). Like the HTC-designed Google Nexus One, the HTC Surround includes Qualcomm's RTR6285 multiband UMTS (Universal Mobile Telecommunications System)/EGPRS (enhanced general-packet- radio-service) transceiver with integrated GPS capability, along with the company's 1-GHz, ARM Cortex-A9-based QSD8250 Snapdragon SOC (system on chip) (see "ARM versus Intel: a successful stratagem for RISC or grist for CISC's tricks?" EDN, April 7, 2011, pg 24, http://bit.ly/hQwGEu). The phone also includes Samsung's two- die, single-package memory "sandwich," 4 Gbits each of NAND-flash memory and SDRAM. Like the Nexus One, the HTC Surround employs a dual-microphone array for ambient-noise suppression; the lower microphone mounts on this PCB. The HTC Surround contains a ribbon-cable- interconnected two-PCB stack. On the back side of the lower PCB, an Audience A1026 audio processor manages the two- microphone setup, as was the case with the Google Nexus One. Additional semi- conductor content common with the Nexus One includes Qualcomm's PM7540 power- management IC and a Skyworks SKY77336 power-amplifier module. The HTC Surround integrates two speakers, one of which is vis- ible here, for "stereo" audio playback. 24 EDN | MAY 26, 2011

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