Texas Instruments DEM-PCM2912A EVM manual Introduction-PCM2912A, Key Features

Introduction—PCM2912A www.ti.com

1.1Introduction—PCM2912A

The PCM2912A is an audio codec with a USB interface for a USB headset, USB headphones, and a USB audio interface box that integrates mono input, stereo headphone output, an analog loopback line, a programmable gain amplifier (PGA), and microphone bias.

It is available in a 32-pin TQFP package.

The DEM-PCM2912A EVM also carries the Microsoft Windows® Logo License certification from the Microsoft Windows Hardware Quality Labs (WHQL). The DEM-PCM2912A has successfully passed the Microsoft WLP test (DTM Audio) for Windows Vista® x86/x64 platforms.

1.1.1 Key Features

Major features of the PCM2912A include:

∙Analog Front End:

–Microphone amplifier (+20 dB gain)

–Mono input

∙Analog Back End:

–Stereo/Mono headphone amplifier or line output with volume

∙Analog Performance:

–Dynamic range: 90 dB (DAC)

–Dynamic range: 90 dB (ADC)

–25-mW headphone output at RL = 16 Ω

∙Power-Supply Voltage

–Single power supply of 5.0 V (VBUS)

∙Low Power Dissipation:

–425 mW at analog-to-digital converter (ADC) and digital-to-analog converter (DAC) operation, 44.1 kHz

–0.8 mW in Suspend mode

∙Sampling Frequency: 8 kHz, 11.025 kHz, 16 kHz, 22.05 kHz, 32 kHz, 44.1 kHz, 48 kHz for ADC and

DAC

∙Programmable Function:

––76-dB to 0-dB gain for analog outputs

––12-dB to +30-dB gain for analog inputs

––76-dB to 0-dB gain for sidetone

–0-dB/20-dB gain for microphone amplifier

–High-pass filter: 0.078 ×fS cutoff frequency

∙Package: 32-pin TQFP

∙Operating Temperature Range: –25°C to +85°C

10 Description SBAU141–January 2009

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