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DA7400 Datasheet(PDF) 13 Page - Dialog Semiconductor |
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DA7400 Datasheet(HTML) 13 Page - Dialog Semiconductor |
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13 / 135 page  DA7400 High Performance Stereo Codec Final Datasheet Revision 3.0 03-Jul-2020 CFR0011-120-00 13 of 135 © 2020 Dialog Semiconductor 2 Block Diagram DA7400 Clocking PLL OSC SRM Control DAI Power & References VREFP VMID MICBIAS BG PCM 8 kHz to 384 kHz HP Power Class-G HP Charge Pump I 2C Slave MODE LDO SRC Audio Processing Unit (APU) Input Filter s Decimation Gain ALC Level-Detect Output Filter s Interpolation Gain SDM DACL DACR ADCL ADCR VDDA VDDIO GND MICL HPL_POS HPR_POS HPL_NEG HPR_NEG GND VDDMB MICR DMI C_DATA_B DMI C_CLK_AB DMI C_DATA_A DMI C IF Figure 2: Block Diagram 2.1 Blocks Summary Power and References: VDDA is the main analog supply to the chip. VDDIO is the input/output (IO) supply to the chip. The power and references block provides an internal low-dropout regulator (LDO) which generates VDDD to supply the digital circuitry, the input to this LDO is VDDA. Internal reference generators create the bandgap (BG) VBG, and VREF references; the VREF and VBG references must be externally decoupled. VDDD can also be supplied from an external source. Control: The I2C slave is used for control and register access and an active-low interrupt pin (nIRQ) is used to inform an external host of events within the device that require host interaction. A system sequencer enables and disables the audio paths in a pop-and-click free manner. Input Path: The analog-to-digital converters (ADCs) are high-performance sigma-delta converters. The dual microphone inputs support analog microphones as well as line input levels. ADC data is decimated and routed to the audio processing unit (APU). The path has user- configurable gain, automatic level control (ALC) and a root-mean-square (rms) level detector. Output Path: The digital-to-analog converters (DACs) are high-performance sigma-delta converters. The headphone driver is a differential output Class-G driver supplied with a positive and negative voltage from the headphone charge pump. DAC data is sourced from the APU. It is interpolated and sigma-delta modulated (SDM) for the analog output path, which has configurable gain. APU: Within the APU there is a custom programmable digital signal processor (DSP) core capable of performing many audio tasks including equalization, limiting, and low-latency sidetone filtering. DMICs: The pulse density modulation (PDM) DMIC inputs support up to two digital micro-electro- mechanical systems (MEMS) microphones. The data line clocks in left and right channels on opposite edges of the clock. Digital Audio Interface (DAI): The pulse code modulation (PCM) interface is the main synchronous audio interface to the host, operating in either master or slave configuration. It operates at a bit clock (BLCK) rate of up to 24.576 MHz, supporting a maximum sample rate of 384 kHz (stereo, 32 bits). It transmits the microphone data and receives stereo data for the headphone output. |
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