參數(shù)資料
型號: ATJ2085
廠商: Electronic Theatre Controls, Inc.
英文描述: ATJ2085 is a single-chip for flash-based digital music player
中文描述: ATJ2085是一種單芯片基于閃存的數(shù)字音樂播放器
文件頁數(shù): 17/35頁
文件大?。?/td> 609K
代理商: ATJ2085
ATJ2085 DATA SHEET Actions
Copyright 2004 Actions Semiconductor Co., Ltd. All rights reserved.
VER 1.5
Page 16
8/18/2004
The internal microphone amplifier has gain for recording. The VMIC pin is the power supply (2.2V)
for microphone.
The audio ADC is an 18 bits sigma delta Analog-to-Digital Converter. Its input source can be
selected from MIC amplifier or external FM or line-in, and it has two FIFO.
ATJ2085 has an 8-bit switched-capacitor SAR Analog-to-Digital Converter (SARADC). Its input
source is LRADC pin
for remote control
, input range is 0.8-2.2V, and its FS can be 8K, 4K, 2K,
1K. In remote control
only the most significant 8 bits are used
4.10 DAC
ATJ2085’s DAC3 is an on-chip Sigma-Delta Modulator, composed by a high performance DAC.
And the DAC analog block refers to the following diagram. The DAC interface supports 4-level
play back FIFO (8 x 20-bit PCM data for L/R channel) and variable sample rates, such as 48K/
44.1K / 32K/ 24K/ 22.05K/ 16K/ 12K/ 11.025K/ 8KHz. An on-chip PLL2 is used to generate
22.5792MHz from 24.576MHz to support 44.1K/2 2.05 K/ 11.025KHz with 256xFS clock for
over-sampling, while 24.576MHz supports 48K/ 32K/ 24K/ 16K/ 12K/ 8KHz with 256XFS for
over-sampling.
WWW.MP3JS.COM.CN
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