ATJ2085 ETC, ATJ2085 Datasheet - Page 17

• Manufacturer Part Number: ATJ2085
• Description: Atj2085 is a Single-chip for Flash-based Digital Music Player
• Manufacturer: ETC

ATJ2085
4.10 DAC
Copyright © 2004 Actions Semiconductor Co., Ltd. All rights reserved.
VER 1.5
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。
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.
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Page 16
DATA SHEET
8/18/2004
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