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參數資料
| 型號： | AV2636 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 24-bit 192kHz Stereo Audio DAC |
| 中文描述： | 24位192kHz立體聲音頻DAC |
| 文件頁數： | 5/16頁 |
| 文件大小： | 821K |
| 代理商： | AV2636 |
AV2636
Product Datasheet
OPERATING MODE
The AV2636 can operate at two modes. They are auto-detect mode and programmable mode. The
‘MODE’ pin status (High/Low) determines which mode the device will be operated. If MODE = Low (pull to
GND or not connected using internal pull down), the device will be operated at auto-detect mode. If
MODE = High (pull to VDD), the device will be operated at programmable mode. The basic functions of
the two modes are described as follows:
Auto-detect mode:
The relation between sample rate and master clock frequency is auto detected.
De-emphasis and serial interface mode are determined by FMTC and FMTD pins.
Programmable mode:
The device operation will be set by on chip control registers that can be
accessed through a two-wire command interface.
AUDIO DATA SAMPLE RATE AND MASTER CLOCK FREQUENCY
The AV2636 supports various audio data sample rate (fs) from 8kHz to 192kHz. The typical audio sample
rates are 32kHz, 44.1kH, 48kHz, 96kHz and 192kHz. The master clock (MCK) can be of 64fs to 384fs
depending on the operation mode. MCK is an input clock that operates the internal digital filters. Other on
chip clocks are also derived from MCK.
The on-chip master clock detection circuit automatically determines the relationship of master clock
frequency and audio sample rate. The counting error is set to be ±8 master clock cycles. If the error is
larger than the threshold, the DAC output will be shut down and auto muted.
The master clock has to be synchronized with the serial audio data frame signal ‘SF’. SF is also called left
and right data frame signal. The phase difference and clock jitters can be tolerated.
Master Clock Frequency MCK (MHz)
Sample
Rate (fs)
64fs
96fs
128fs
32 kHz
N/A
N/A
N/A
44.1 kHz
N/A
N/A
N/A
48 kHz
N/A
N/A
N/A
88.2 kHz
N/A
N/A
11.1896
96 kHz
N/A
N/A
12.288
192 kHz
12.288
18.432
24.576
Note:
* Only available at programmable mode.
192fs
N/A
N/A
N/A
16.9344
18.432
36.864
256fs
8.192
11.2896
12.288
22.5792
24.576
49.152*
384fs
12.288
16.9344
18.432
33.8688
36.864
73.728*
AVS Technology, Inc.
www.avstech.com
5-16
August 18, 2004
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