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參數(shù)資料
| 型號： | 0W888-002-XTP |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 數(shù)字信號處理 |
| 英文描述： | BelaSigna 250 - 16 bit Audio Processor, Full Stereo 2-in, 2-out; Package: LFBGA 64, 7x7; No of Pins: 64; Container: Tape and Reel; Qty per Container: 1500 |
| 中文描述： | 0-BIT, 50 MHz, MIXED DSP, PBGA64 |
| 封裝： | 7 X 7 MM, GREEN, LFBGA-64 |
| 文件頁數(shù)： | 2/34頁 |
| 文件大?。?/td> | 935K |
| 代理商： | 0W888-002-XTP |
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Rev. 7 | Page 10 of 34 | www.onsemi.com
BelaSigna 250
2.1.6. Audio Inputs
The audio input traces should be as short as possible. The input impedance of each audio input pad (e.g., AI0, AI1, etc.,) is high
(approximately 500k); therefore a 10nF capacitor is sufficient to decouple the DC bias. This capacitor and the internal resistance form
a first-order analog high pass filter whose cutoff frequency can be calculated by f3dB (Hz) = 1/(RC2), which results with ~30Hz for
10nF capacitor. This 10nF capacitor value applies when the preamplifier is being used, in other words, when a non-unity gain is applied
to the signals. When the preamplifier is by-passed, the impedance is reduced; hence, the cut-off frequency of the resulting high-pass
filter could be too high. In such a case, the use of a 30-40nF serial capacitor is recommended.
Keep audio input traces strictly away from output traces. Microphone ground terminals should be connected to the AGND plane (if
present) or share a trace with the input ground reference voltage pin (AIR) to the star point. Analog and digital outputs MUST be kept
away from microphone inputs to ensure low noise performance.
2.1.7. Audio Outputs
The audio output traces should be as short as possible. If the direct digital output is used, the trace length of RCVRx+ and RCVRx-
should be approximately the same to provide matched impedances. If the analog audio output is used, the ground return for the
external power amplifier should share a trace with the output ground reference voltage pin (AOR) to the star point.
3.0 Architecture Overview
Figure 5: BelaSigna 250 Architecture: A Complete Audio Processing System
3.1 RCore DSP
The RCore is a 16-bit fixed-point, dual-Harvard architecture DSP. It includes efficient normalize and de-normalize instructions, and
support for double precision operations to provide the additional dynamic range needed for many applications. All memory locations in
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