描述 Description

The PCM3052A is a low-cost, single-chip, 24-bit stereo audio codec (ADC and DAC) with single-ended analog voltage input and output. It also has an analog front end consisting of a 34-dB microphone amplifier, microphone bias generator, 2 stereo multiplexers, and a wide-range PGA. Analog- to-digital converters (ADCs) employ delta-sigma modulation with 64-times oversampling. On the other hand, digital-to-analog converters (DACs) employ modulation with 64- and 128-times oversampling. ADCs include a digital decimation filter with a high-pass filter, and DACs include an 8-times oversampling digital interpolation filter. The PCM3052A has many functions which are controlled using the I2C interface: DAC digital de-emphasis, digital attenuation, soft mute etc. The PCM3052A also has an S/PDIF output pin for the DAC digital input. The power-down mode, which works on ADCs and DACs simultaneously, is provided by an external pin. The PCM3052A is suitable for a wide variety of cost-sensitive PC audio (recorder and player) applications where good performance is required. The PCM3052A is fabricated using a highly advanced CMOS process and is available in a small 32-pin VQFN package.

特性 Features

? Microphone Amplifier and Bias
? Monaural Microphone Amplifier: 34-dB Gain at Differential Input
? Microphone Bias: 1 mA at 3.75 V

? Multiplexer and PGA
? Multiplex of Stereo Single-Ended Line Inputs and Monaural Microphone Amplifier
? 0.1 Vrms to 1.5 Vrms Full-Scale Input Range
? 22-k Input Resistance at 0.1-Vrms Input
? 20 dB to -4 dB/range, 1 dB/step PGA

? Reference Output: ±10 mA at 2.5 V
? 24-Bit Delta-Sigma ADC and DAC
? Stereo ADC:
? Full-Scale Input: 3 Vp-p
? Antialiasing Filter Included
? 1/64 Decimation Filter:
Pass-Band Ripple: ±0.05 dB
Stop-Band Attenuation: -65 dB
? On-Chip High-Pass Filter: 0.91 Hz at fS = 48 kHz
? High Performance:
THD+N: -94 dB (Typical)
SNR: 101 dB (Typical)
Dynamic Range: 101 dB (Typical)

? Stereo DAC:
? Single-Ended Voltage Output: 4 Vp-p
? Analog Low-Pass Filter Included
? ×8 Oversampling Digital Filter:
Pass-Band Ripple: ±0.03 dB
Stop-Band Attenuation: -50 dB
? High Performance:
THD+N: -97 dB (Typical)
SNR: 105 dB (Typical
Dynamic Range: 104 dB (Typical)

? S/PDIF Output for DAC Digital Input
? Multiple Functions With I2C Interface:
? Digital De-Emphasis: 32-, 44.1-, 48-kHz
? Zipper-Noise-Free Digital Attenuation and Soft Mute for DAC
? HPF Bypass Control for ADC
? S/PDIF Output Control
? Power Down: ADC/DAC Independently

? External Power-Down Pin:
? ADC/DAC Simultaneously

? Audio Data Format: 24-Bit I2S Only
? Sampling Rate:
? 16-96 kHz for Both ADC and DAC

? System Clock: 256 fS Only
? Dual Power Supplies:
? 5 V for Analog and 3.3 V for Digital

? Package: VQFN-32
System Two, Audio Precision are trademarks of Audio Precision, Inc.