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DLBM-CA120 데이터시트(PDF) 6 Page - Delta Electronics, Inc. |
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DLBM-CA120 데이터시트(HTML) 6 Page - Delta Electronics, Inc. |
6 / 17 page DLBM-CA120/121 Data Sheet April 20, 2005 Proprietary Information and Specifications are Subject to Change 9.Audio Codec The DLBM-CA120 CODEC is compatible with the direct speaker drive and microphone input using a minimum number of external components. It is primarily intended for voice applications and it is fully operational from a single 1.8 Volt power supply. A fully differential architecture has been implemented for optimal power supply rejection and low noise performance. The digital format is 15-bit/sample linear PCM with a data rate of 8kHz. The CODEC has an input stage containing a microphone amplifier, variable gain amplifier and aΣ-ΔADC. Its output stage contains a DAC, low-pass filter and output amplifier. The CODEC functional diagram is shown below: 10. Input Stage A low noise variable gain amplifier amplifies the signal difference between inputs MIC_N and MIC_P. The input may be from either a microphone or line. The amplified signal is then digitised by aΣ-ΔADC. The high frequency single bit output from the ADC is converted to 15-bit 8kHz linear PCM data. The gain is programmable via a PSKEY and has a 42dB range with 3dB resolution. At maximum gain the full scale input level is 3mV rms. A bias network is required for operation Input Ampler Output Ampler ΣΔ -ADC DAC Re MIC_P MIC_N SPKR_P SPKR_N Digital Circulty Figure 3. DLBM-CA120 CODEC Diagram |
유사한 부품 번호 - DLBM-CA120 |
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유사한 설명 - DLBM-CA120 |
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