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ADSP-BF525C Datasheet(PDF) 5 Page - Analog Devices |
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ADSP-BF525C Datasheet(HTML) 5 Page - Analog Devices |
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5 / 36 page  ADSP-BF522C/ADSP-BF523C/ADSP-BF524C/ADSP-BF525C/ADSP-BF526C/ADSP-BF527C Rev. A | Page 5 of 36 | March 2010 The first gain stage is composed of a low noise operational amplifier set to an inverting configuration with integrated 50 k Ω feedback and 10 kΩ input resistors. The default micro- phone input signal gain is 14 dB. An external resistor (REXT) can be connected in series with the MICIN pin to reduce the first- stage gain of the microphone input signal to as low as 0 dB by using the following equation: Microphone Input Gain = 50 k Ω/(10 kΩ + REXT) The second-stage gain of the microphone signal path is derived from the internal microphone boost circuitry. The available set- tings are 0 dB, 20 dB, and 40 dB and are controlled by the MICBOOST (Register R4, Bit D0) and MICBOOST2 (Register R4, Bit D8) bits. To achieve 20 dB of secondary gain boost, the programmer can select either MICBOOST or MICBOOST2. To achieve 40 dB of secondary microphone signal gain, the pro- grammer must select both MICBOOST and MICBOOST2. The MUTEMIC bit (Register R4, Bit D1) mutes the microphone input signal to the ADC. When using either the line or microphone inputs, the maximum full-scale input to the ADC is 1.0 V rms when AVDD = 3.3 V. Do not apply an input voltage larger than full-scale to avoid overloading the ADC, which causes distortion of sound and deterioration of audio quality. For best sound quality in both microphone and line inputs, gain should be carefully configured so that the ADC receives a signal equal to its full-scale. This maximizes the signal-to-noise ratio for best total audio quality. Bypass and Sidetone Paths to Output The line and microphone inputs can be routed and mixed directly to the output terminals by programming the SIDET- ONE (Register R4, Bit D5) and BYPASS (Register R4, Bit D3) registers. In both modes, the analog input signal is routed directly to the output terminals and is not digitally converted. The bypass signal at the output mixer is the same level as the output of the PGA associated with each line input. The sidetone signal at the output mixer can be attenuated from –6 dB to –15 dB in steps of –3 dB by configuring the SIDEATT (Register R4, Bit D6 and Bit D7) control register bits. The selected level of attenuation occurs after the initial microphone signal amplification from the microphone first and second stage gains. Line and Headphone Outputs The DAC outputs, the microphone (the sidetone path), and the line inputs (the bypass path) are summed at an output mixer (see Figure 4). This output signal is then applied to both the ste- reo line outputs and stereo headphone outputs. The codec has a set of efficient headphone amplifier outputs, LHPOUT and RHPOUT, that are able to drive 16 Ω or 32 Ω headphones (shown in Figure 5). Like the line inputs, the LHPOUT and RHPOUT volumes, by default, are independently adjusted by setting the LHPVOL (Register R2, Bit D0 to Bit D6) and RHPVOL (Register R3, Bit D0 to Bit D6) bits of the headphone output control registers. The headphone outputs can be muted by writing codes less than 0110000 to the LHPVOL and RHPVOL bits. Figure 3. Microphone Input to ADC ADC OR SIDETONE INTERNAL CIRCUITRY MICIN AVDD VMID AGND REXT 10kΩ 50kΩ 0dB/20dB/40dB GAIN BOOST Figure 4. Output Signal Chain Figure 5. Headphone Output LINE OUTPUT AND HEADPHONE OUTPUT AVDD VMID AGND BYPASS SIDETONE DACSEL LINE INPUT MICROPHONE INPUT DAC OUTPUT INTERNAL CIRCUITRY RHPOUT or LHPOUT DAC/ SIDETONE/ BYPASS AVDD VMID AGND + – INTERNAL CIRCUITRY |
Similar Part No. - ADSP-BF525C_15 |
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Similar Description - ADSP-BF525C_15 |
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