Texas Instruments DEM-PCM2912 EVM, Руководство пользователя, Страница: 10 / 43

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1.1 Introduction—PCM2912
1.1.1 Key Features
Introduction—PCM2912
The PCM2912 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.
Major features of the PCM2912 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 SBAU132 – March 2008
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