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AKM AK4679集成音频DSP的24位立体声CODEC解决方案

来源: 中电网
2019-05-16
类别:消费电子
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文章创建人 拍明芯城

原标题:AKM AK4679集成音频DSP的24位立体声CODEC解决方案

  akm公司的AK4679是一款内置麦克风放大器、接收放大器、D类扬声器放大器、耳机放大器、线性放大器的24位立体声编解码音频DSP芯片。本文详细介绍了AK4679的主要特性、框图、应用框图以及采用AK4679芯片设计的评估开发板,通过评估板详细介绍了AK4679芯片各种模式下的应用设置及测试,评估板主要有评估板框图、电路原理图。

  The AK4679 is a 24bit stereo CODEC and a built-in Microphone-Amplifier,Receiver-Amplifier, Mono Class-D Speaker-Amplifier, Cap-less Class-G Headphone-Amplifier and Line-Amplifier as well as HF/Audio DSP. The AK4679 features AKM DSP core to deal with hands free function for wide band and dual PCM I/F in addition to audio I/F that allows easy interfacing in mobile phone designs with Bluetooth I/F. The playback features also include 5-band Parametric EQ and Dynamic Range Control; therefore the AK4679 can automatically adjust the volume to a comfortable level that has no distortion and provides great flexibility. The AK4679 is available in a 78pin BGA, tilizing less board space than competitive offerings.

  AK4679主要特性

   CODEC&Amp block

  1. Recording Function (Stereo CODEC)

  • 4 Stereo Input Selectors

  • 4 Stereo Inputs (Single-ended) or 3 Mono Input (Full-differential)

  • MIC Amplifier: +24dB ~ −6dB, 3dB step

  • 2 Output MIC Power Supplies

  • Digital ALC (Automatic Level Control): +36dB ~ −54dB, 0.375dB Step, Mute

  • ADC CHARACTERISTICS: S/(N+D): 80dB, DR, S/N: 87dB (MIC-Amp=+18dB)S/(N+D): 80dB, DR, S/N: 92dB (MIC-Amp=0dB)

  • Stereo Digital MIC Interface

  • Wind-noise Reduction Filter

  • Stereo Separation Emphasis

  • 3-band Programmable Notch Filter

  • Audio Interface Format: 24/16bit MSB justified, 24/16bit I2S, 16bit DSP Mode

  2. Playback Function (Stereo CODEC)

  • Digital Volume (+6dB ~ −57.0dB, 0.5dB Step, Mute)

  • Digital ALC (Automatic Level Control): +36dB ~ −54dB, 0.375dB Step, Mute

  • Stereo Separation Emphasis

  • Dynamic Range Control

  • 5-band Parametric Equalizer

  • Stereo Line Output (Selectable Full-differential / Single-ended)

  • Mono Receiver-Amp

  - BTL Output

  - Output Power: 60mW @ 32Ω

  - Analog Volume: +12 ~ −30dB & Mute, 3dB Step

  • Cap-less Stereo Class-G Headphone-Amp

  - Output Power: 25mW @ 32Ω, 45mW @ 16Ω

  - Analog Volume: +6 ~ −62dB & Mute, 2dB Step

  - Zero crossing Detection

  - Pop Noise Free at Power-ON/OFF

  • Mono Class-D Speaker-Amp

  - BTL Output

  - Short Protection Circuit

  - Output Power: 1.1W @ 8Ω, SVDD=4.2V, THD+N = 10% 0.89W @ 8Ω, SVDD=4.2V, THD+N = 1%

  - Analog Volume: +12 ~ −30dB & Mute, 3dB Step

  - Pop Noise Free at Power-ON/OFF

  • Audio Interface Format:

  - 24/16bit MSB justified, 16bit LSB justified, 16/24bit I2S, 16bit DSP Mode

  3. Dual PCM I/F for Baseband & Bluetooth Interface

  • Four sample Rate Converters (Up sample: up to x6: Down sample: down to x1/6)

  • Sample Rate:

  - PORTA (Mono): 8 ~ 16kHz

  - PORTB (Stereo): 8 ~ 48kHz

  • Digital Volume

  • Slave Mode

  • Audio Interface Format:

  - 16bit Linear, 8bit A-law, 8bit μ-law

  - Short/Long Frame, I2S, MSB justified

  4. Power Management

  5. Master Clock(Audio I/F):

  (1) PLL Mode

  • Frequencies: 11.2896MHz, 12MHz, 12.288MHz, 13MHz, 13.5MHz, 19.2MHz,

  24MHz, 25MHz, 26MHz, 27MHz (MCKI pin)

  32fs or 64fs (BICK pin)

  (2) External Clock Mode

  • Frequencies: 256fs, 512fs or 1024fs (MCKI pin)

  6. Output Master Clock Frequencies(Audio I/F): 32fs/64fs/128fs/256fs

  7. Sampling Frequency (Audio I/F)

  • PLL Slave Mode (BICK pin): 8kHz ~ 48kHz

  • PLL Master Mode:

  8kHz, 11.025kHz, 12kHz, 16kHz, 22.05kHz, 24kHz, 32kHz, 44.1kHz, 48kHz

  • EXT Master/Slave Mode:

  8kHz ∼ 48kHz (256fs), 8kHz ~ 24kHz (512fs), 8kHz ~ 12kHz (1024fs)

  8. Audio I/F: Master/Slave mode

  DSP block

  9. Embedded DSP

  - Flexible programming with built-in program and data memories

  - Hardware accelerator

  - Word length: 24bit (Data RAM 24bit floating point)

  - Multiplier 20 x 20 40bit (double precision available)

  - Divider 20 / 20 20bit

  - ALU: 44bit arithmetic operation (with overflow margin 4bit)

  24bit floating point arithmetic and logic operation

  - Program RAM: 4096w x 36bit

  - Coefficient RAM: 2048w x 20bit

  - Data RAM: 2048w x 24bit (24bit floating point)

  - Offset Register: 32w x 15bit

  - Delay RAM: 16384w x 24bit (24bit floating point)

  - 5625 steps at fs16KHz, 1875 steps at fs48KHz

  - Internal clock generator

  10. DSP Serial Audio Interface Format

  - 24bit Left justified, I2S,

  - 16/24 bit linear, 8bit A-law, 8bit μ-law PCM

  - Sampling rate 8 KHz ~ 48 KHz

  - Up/Down sampling rate converter for Port#2 (8KHz → 16KHz)

  11. Operational, sleep, suspend mode

  General

  12. μP I/F: I2C Bus (Ver 1.0, 400kHz Fast Mode), SPI (DSP block only)

  13. Ta = −30 ~ 85°C

  14. Power Supply:

  • SVDD (SPK/RCV/LINE-Amp): 3.0 ~ 5.5V

  • AVDD (Analog): 1.7 ~ 2.0V

  • DVDD (Digital Core): 1.7 ~ 2.0V

  • PVDD (HP-Amp & Charge Pump): 1.7 ~ 2.0V

  • TVDDA, TVDDE (Digital I/F): 1.6 ~ 3.6V

  • VDDE (DSP Core) 1.1 ~ 1.3V

  15. Package : 78pin FBGA(4.5 x 4.5 mm, 0.4mm pitch)

  图1.模拟框图

  图2.数字框图

  图3.DSP框图

  采用AK4679评估板参考设计

  The AKD4679-A is an evaluation board for AK4679, 24bit stereo CODEC with Microphone/ Receiver/Headphone/ Speaker/ Line amplifier as well as HF/Audio DSP. The AKD4679-A has the one Digital Audio I/F and two PCM I/F. It can achieve the interface with digital audio systems via optical connector and 10pin Port connector.

  AK4679评估板参考设计的主要特性

  DIR/DIT with optical input/output

  10pin Header for Digital Audio I/F and PCM I/F (Baseband, Bluetooth)

  BNC connector for an external clock input

  10pin Header for I2C control mode

  图4.参考设计框图

  图5.参考设计原理图(1)

  图6.参考设计原理图(2)

  图7.参考设计原理图(3)

  图8.参考设计原理图(4)

  图9.参考设计原理图(5)

  图9.参考设计原理图(5)


责任编辑:HanFeng

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标签: AKM DSP

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