Let me get this out of the way: I like, own and use this product, among others from Apple. Any thoughts-or hyperbole-expressed are undoubtedly an artifact of user bias toward the company's stuff. End of disclaimer and on with the show.
With the usual fanfare, Apple introduced the iPod Shuffle in January, ending rampant speculation on whether the company would take a new direction with its traditionally hard-disk-based line of audio players. The Shuffle provided up to 1 Gbyte of storage capacity-enough to hold about 250 MP3 songs-based on the latest commercial level of NAND flash integration at the time. Along with providing an important validation of flash as the storage medium of choice for lower-capacity players, the Shuffle represented Apple's next step in efforts to maintain an enviable dynasty in the product category.
Small size was a key tenet of the Shuffle, with the total product coming in at a diminutive 85 x 25 x 8.5 mm. Picture a six-pack of chewing gum and you get an idea of the product form factor. Suddenly, many of the competing flash-based players on the market looked big in comparison.
Another doctrine of design was Zen-like simplicity and to the dismay of critics, there was no display. Only a set of barely raised navigation buttons and a flush on-off mode switch intruded on the squared-off plastic case. Apple chose minimalism over the sometimes overwrought and busy interfaces of other products. Also, only sequential or random playback of content is supported. Much like any memory stick, the built-in USB connector plugs directly into the host computer, where songs can be loaded with drag-and-drop selection or automatically filled with random library content. The marketing angle for Shuffle seems clear: less is more.
Overall, the Shuffle is designed to be functionally distant from the existing iPod lineup. Without threatening sales of the higher-priced and higher-capacity models, the product can draw in users previously priced out of the iPod market while giving existing iPod owners a secondary product for highly mobile situations. Size and weight attributes for the Shuffle, along with the choice of less-fragile solid-state storage, make the product more appropriate for running or working out. A lower price point arguably expands use of the Shuffle in situations that might be deemed hazardous to the more expensive hard-drive iPods.
Three primary components can be attributed to enabling the Shuffle design goals: application-specific processors for flash audio players, big NAND storage in a single stacked package and high-energy-density rechargeable batteries.
In a break from tradition for Apple's component supply chain, the Shuffle is powered by Sigmatel's STMP3550 D-Major audio player system-on-chip. This single, central device replaces a more complex mix of components found in previous hard-drive-based iPods, integrating audio codec, power management, USB interface, headphone amplifier, controller functions and memory interface.The chip was essential to simultaneously minimize cost, complexity, power consumption and assembly area-all key pieces for a low-cost, ultrasmall player.
Samsung NAND flash provides all file storage. A K94G08UOM 2 x 256-Mbyte stacked chip is used in the 512-Mbyte Shuffle. In the 1-Gbyte version of the product, a K9W8G08U1M 1-Gbyte chip replaces the smaller-capacity package, stacking four 256-Mbyte chips in a single surface-mount part. The 1-Gbyte stack has likely been reduced to a two-chip affair on the latest versions of the Shuffle.
A small internal 220-milliamp-hour lithium-polymer battery from Amperex Technology Ltd. of China supplies enough juice to the miserly component set to get well over 10 hours of use per charge. Small-scale components from Ricoh, TI and International Rectifier represent the limited dabs of semiconductor glue needed to bring the electrical design together.
System integration plays a critical role in realizing an industrial design with minimal "dead air" in the product enclosure. The housing is a two-piece affair with most of the enclosure formed in one molding. A second USB connector end-cap assembly snap-fits to seal the unit. Internally, the Sigmatel audio processor and Samsung memory reside on separate boards, with the two interconnected circuit assemblies carefully nested to free up room for the battery. The USB connector integrates a dozen or so components to protect the Shuffle from static discharge while the thin keypad assembly makes contact to snap-dome contacts on the back side of the internal memory board.
Total estimated cost-of-goods-sold (COGS) including accessories came to around $45 for the $99, 512-Mbyte product in early 2005. Since NAND memory content dominates BOM cost, overall COGS is highly sensitive to Apple's negotiated price with Samsung, but it seems certain that margins have improved, given recent NAND price erosion.
With the "missing display" and limited modes of operation, the Shuffle is probably a love-it/hate-it proposition as a standalone player. For those who already own a hard-drive iPod-myself included-the Shuffle is an elegant complement for times when a little random music and a small, robust player will do the trick.
David Carey, president of Portelligent (www.teardown.com). The Austin, Texas, company produces teardown reports and related industry research on wireless, mobile and personal electronics.
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