Evaluation Module User's Guide

1.1 Introduction—PCM2912A
1.1.1 Key Features
Introduction—PCM2912A www.ti.com
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.
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, 44.1
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 × f
S
cutoff frequency
• Package: 32-pin TQFP
• Operating Temperature Range: –25 ° C to +85 ° C
Description 10 SBAU141 – January 2009
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