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Stereo-with-power-management IC condenses portables

Kirchheim/Teck, Germany&#8212Dialog Semiconductor's first audio-with-power management IC, the DA9034, is designed to support the latest generation of application processors for smartphones, portable multimedia devices (PMP), PDAs, and personal navigators.

The chip integrates more than 50 functions to cut real-estate requirements, including a 24-bit hi-fi stereo subsystem, 1400-mA buck converter, 18 LDOs, and reportedly the first linear regulators to feature dynamic voltage management (DVM). Working directly from a battery source, the chip integrates a 24-bit hi-fi stereo DAC featuring programmable sample rates up to 48 kHz and automatic sample rate conversion, which make it suitable for playback of multimedia sources such as MP3 and WMA files.

Features include a voice codec with programmable filtering and 8, 16 and 32 kHz sampling, two microphone amplifiers, low-noise input and output audio multiplexers, capacitor-free 16-ohm headphone drivers, 500 mW loudspeaker driver with volume and anti-pop control, and 32-ohm earpiece driver. The audio sub-system has advanced power management control to minimize quiescent current and consumes as little as 9 mW in the 8 kHz voice mode and 35 mW in the 48 kHz Hi-Fi mode.

Two high-efficiency DC/DC buck converters deliver a low-voltage, high-current supply source for the processor core and memory. A second boost converter, a programmable high-voltage supply, delivers up to 1.3 amps at 25 volts to power three individual LED backlighting channels and flash or video light LEDs. The backlight drivers feature an advanced dimming function which ramps the LED current, thus providing a gradated change in light output. A 10-bit ADC is integrated for user measurements and features three channels with programmable upper and lower threshold limits and an automatic measurement and averaging mode to simplify software. The ADC also supports a 4-wire Touchscreen interface.



The DA9034's LDOs feature a power supply rejection ratio (PSRR) of typically 80 dB at 217 Hz, and low quiescent current using the company's Smart Mirror technology. These regulators mirror the output current demand back to the bias generator, which reduces the bias automatically as the demand for power falls. This autonomous adaptive bias control also removes the need for a low-power operating mode and hence user intervention to switch modes under low-current conditions. Using this technique at 10 mA, the LDOs boast 99 percent current efficiency.

The battery management circuitry includes a programmable constant-voltage, constant-current battery charger (up to 1.4 amps), and pulse and trickle charging from either USB or external adapters. The battery management subsystem includes a UART that supports intelligent battery communication, full time supervision with under- and over-voltage protection, battery temperature measurement circuitry and a reverse mode to allow powering of accessories from the phone system connector.

Contact the company (Irvine, Calif.) for the product datasheet. The DA9034, available now in sample quantities in an 8-by-8 mm BGA package, is priced at $3.30 each in 100k volumes.

Dialog Semiconductor , 1-949-623-8301, www.Dialog-Semiconductor.com

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