Texas Instruments DEM-DAI3793A Manuel D’Utilisation
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1.1
Introduction—PCM3793A/94A
1.1.1 Key Features
Introduction—PCM3793A/94A
The PCM3793A/94A is a low-power stereo codec designed for portable digital audio applications. The
device integrates a stereo digital speaker amplifier, headphone amplifier, line amplifier, line input, boost
amplifier, microphone bias, programmable gain control, analog mixing, sound effects, and automatic level
control (ALC) features. (The PCM3794A has no speaker amplifiers.)
device integrates a stereo digital speaker amplifier, headphone amplifier, line amplifier, line input, boost
amplifier, microphone bias, programmable gain control, analog mixing, sound effects, and automatic level
control (ALC) features. (The PCM3794A has no speaker amplifiers.)
It is available in a 5
×
5 QFN package to reduce the overall device footprint. The PCM3793A/94A accepts
Right-Justified, Left-Justified, I
2
S™, and digital signal processing (DSP) formats, providing an easy
interface to audio DSPs, as well as decoders and encoder chips. Sampling rates up to 50kHz are
supported. The user-programmable functions are accessible through a two- or three-wire serial control
port.
supported. The user-programmable functions are accessible through a two- or three-wire serial control
port.
Major features of the PCM3793A/94A include:
•
Analog Front End:
–
Stereo single-ended input with multiplexer (mux)
–
Mono differential input
–
Stereo programmable gain amplifier (PGA)
–
Microphone amplifier (20dB) and bias
•
Analog Back End:
–
Stereo/Mono line output with volume
–
Stereo/Mono headphone amplifier with volume and capless mode
–
Stereo/Mono digital speaker amplifier (BTL) with volume
•
Analog Performance:
–
Dynamic range: 93dB (digital-to-audio converter [DAC])
–
Dynamic range: 90dB (analog-to-digital converter [ADC])
–
40mW + 40mW headphone output at R
L
= 16
Ω
–
700mW + 700mW speaker output at R
L
= 8
Ω
•
Power Supply Voltage
–
1.71V to 3.6V for digital I/O section
–
1.71V to 3.6V for digital core section
–
2.4V to 3.6V for analog section
–
2.4V to 3.6V for power amplifier section
•
Low Power Dissipation:
–
7mW in playback, 1.8V/2.4V, 48kHz
–
13mW in record, 1.8V/2.4V, 48kHz
–
3.3
μ
W in power-down
•
Sampling Frequency: 5kHz to 50kHz
•
Automatic Level Control for Recording
•
Operation From a Single Clock Input without PLL
•
System Clock:
–
Common-audio clock (256f
S
/384f
S
), 12MHz/24MHz, 13MHz/26MHz, 13.5MHz/27MHz,
19.2MHz/38.4MHz, 19.68MHz/39.36MHz
•
Headphone Plug Insert Detection
•
I
2
C™ or SPI™ Serial Control
12
Description
SBAU127 – July 2007