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ADSP-BF523C Datasheet(PDF) 4 Page - Analog Devices |
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ADSP-BF523C Datasheet(HTML) 4 Page - Analog Devices |
4 / 44 page Rev. PrC | Page 4 of 44 | June 2008 ADSP-BF523C/ADSP-BF525C/ADSP-BF527C Preliminary Technical Data The device is controlled by a TWI or SPI serial interface which provides access to all features including volume controls, mutes and extensive power management facilities. The CODEC is designed specifically for portable audio prod- ucts. Its features, performance and low power consumption make it ideal for portable MP3 players and portable mini-disc players. The CODEC includes line and microphone inputs to the on- board ADC, line and headphone outputs from the on-board DAC, a crystal oscillator, configurable digital audio interface and a choice of two or three wire control interface. The CODEC includes three low noise inputs—a monaural microphone and left and right stereo lines. Line inputs have +12 dB to –34 dB logarithmic volume level adjustments and mute. The microphone input has –6 dB to +34 dB volume level adjust- ment. An electret microphone bias level is also available. All the required input filtering is contained within the device with no external components required. The on-board stereo analog-to-digital converter (ADC) uses a high-quality multi-bit high-order oversampling architecture to deliver optimum performance with low power consumption. The output from the ADC is available on the digital audio inter- face. The ADC includes an optional digital high pass filter to remove unwanted dc components from the audio signal. The on-board digital-to-analog converter (DAC) accepts digital audio from the digital audio interface. Digital filter de-emphasis at 32 kHz, 44.1 kHz and 48 kHz can be applied to the digital data under software control. The DAC uses a high quality multi-bit high-order oversampling architecture to deliver optimum per- formance with low power consumption. The DAC outputs, microphone (SIDETONE) and line inputs (BYPASS) are available both at line level and through a head- phone amplifier capable of efficiently driving low impedance headphones. The headphone output volume is adjustable in the analog domain over a range of +6 dB to –73 dB and can be muted. The design of the CODEC has given much attention to power consumption without compromising performance. It includes the ability to power off selective parts of the circuitry under soft- ware control, thus conserving power. Nine separate power saving modes can be configured under software control includ- ing a standby and power-off mode. Special techniques allow the audio to be muted and the device safely placed into standby, sections of the device powered off and volume levels adjusted without any audible clicks, pops or Figure 1. Audio CODEC Block Diagram CODEC AVDD VMID AGND MICBIAS CSB CSDA CSCL CMODE CONTROL INTERFACE RLINEIN MICIN LLINEIN OSCPD OSC CLKIN DIVIDER CLKOUT DIVIDER DIGITAL AUDIO INTERFACE VOLUME VOLUME MIC BOOST MUTE MUTE MUTE MUTE MUX MUX ADC ADC DIGITAL FILTERS HPVDD HPGND RHPOUT ROUT LOUT LHPOUT HEADPHONE DRIVER HEADPHONE DRIVER VOLUME/ MUTE VOLUME/ MUTE MUTE ATTEN/ MUTE ATTEN/ MUTE MUTE DAC DAC MUTE MUTE XTO |
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