1.1 Introduction—PCM2912A1.1.1 Key Features
Introduction—PCM2912A
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The PCM2912A is an audio codec with a USB interface for a USB headset, USB headphones, and a USBaudio interface box that integrates mono input, stereo headphone output, an analog loopback line, aprogrammable 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 theMicrosoft Windows Hardware Quality Labs (WHQL). The DEM-PCM2912A has successfully passed theMicrosoft WLP test (DTM Audio) for Windows Vista
®
x86/x64 platforms.
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 R
L
= 16 Ω
•Power-Supply Voltage
– Single power supply of 5.0 V (V
BUS
)
•Low Power Dissipation:
– 425 mW at analog-to-digital converter (ADC) and digital-to-analog converter (DAC) operation, 44.1kHz
– 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 andDAC
•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 ×f
S
cutoff frequency
•Package: 32-pin TQFP
•Operating Temperature Range: –25 °C to +85 °C
Description 10 SBAU141 – January 2009Submit Documentation Feedback