DALLAS Texas Instruments Inc. has introduced two DSPcodec products designed to work with its digital signal processors in voice-over-Internet Protocol phones, hands-free car kits, PBX phones and other voice-related applications.
Tom Lahutsky, manager of new-product development for data converters in TI's Advanced Analog Products unit, said the application support available for the TLV320AIC10 and TLV320AIC11 reduces the amount of time required to develop a C54x DSP solution from as much as a month to just a few hours.
"Many of the engineers who are working to add voice functionality to existing products haven't worked with codecs before," Lahutsky said. "And getting a codec to work with a DSP can be tricky."
The new DSPcodec evaluation modules plug directly onto TMS320C54x and TMS320C62x DSP evaluation modules, which eliminates the need for customer-fabricated boards or soldering.
A DSPcodec interface software driver is also available for the C54x DSP Code Composer Studio development environment. The driver provides DSP serial-port configuration, codec configuration, and digital-to-analog and analog-to-digital converter data transfer. It also allows master/slave codec operation.
Both DSPcodecs are 16-bit linear devices with a sample rate of 22 ksamples/second and a signal-to-noise ratio of 84 dB for A/D and D/A conversion. The TLV320AIC10 operates from 3 to 5.5 volts for both analog and digital supplies, and consumes 39 milliwatts at 8 ksamples/s, which Lahutsky said is 25 percent lower than competing parts.
The TLV320AIC11 is identical except that it supports digital I/O operation at 1.2 V and 1.8 Vdc. Lahutsky said the TLV320AIC11 is the only codec that interfaces directly to TI's 1.8-V UC5409 and 1.2-V UVC5402 DSPs for use in low-power applications, such as digital hearing aids.
Continuous data transfer supports DSP autobuffering in both devices. Lahutsky said the feature reduces interrupts and associated processor overhead by streaming data to a buffer of up to 64 kbytes. A host port interface supports on-the-fly reconfiguration, making it possible to reprogram codec registers without interrupting DMA block transfers.
Both parts come in 48-pin thin quad flat packs. The TLV320AIC10 is priced at $3.75 and the TLV320AIC11 at $4.25 in quantities of 1,000.
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EETInfo No. 609