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    AKM AK4678 24位立體聲CODEC解決方案

    發布時間:2012-7-13 10:41    發布者:1770309616
    關鍵詞: AK4678 , AKM , Codec , 立體聲
    AKM公司的AK4678是24位立體聲CODEC,具有內置麥克風放大器,接收放大器,單聲道D類揚聲器放大器,無電容的G類耳機放大器和線路放大器.除了音頻I/F外還有兩個PCM I/F.播放功能包括5波段參數EQ和動態范圍控制,因此能自動調整合適音量而不失真.本文介紹了AK4678主要特性,模擬和數字方框圖,以及評估板 AKD4678-B功能,方框圖,電路圖PCB元件布局圖.

    The AK4678 is a 24bit stereo CODEC with a built-in Microphone-Amplifier, Receiver-Amplifier, Mono Class-D Speaker-Amplifier, Cap-less Class-G Headphone-Amplifier and Line-Amplifier. The AK4678 features 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 AK4678 can automatically adjust a comfortable volume without distortion and provides great flexibility. The AK4678 is available in a 49pin CSP, utilizing less board space than competitive offerings.

    AK4678主要特性:

    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

    9. μP I/F: I2C Bus (Ver 1.0, 400kHz Fast Mode)

    10. Ta = −30 ~ 85?C

    11. 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

    •TVDD (Digital I/F): 1.6 ~ 3.6V

    12. Package : 49pin CSP(2.96 x 2.96 mm, 0.4mm pitch)

    圖1.AK4678模擬方框圖

    圖2.AK4678數字方框圖

    圖3.AK4678典型連接圖(電源部分)

    AK4678評估板 AKD4678-B(Rev.1)

    The AKD4678-B is an evaluation board for AK4678, 24bit stereo CODEC with Microphone/Receiver/Headphone/ Speaker/ Line amplifier. The AKD4678-B has the Digital Audio I/F and can achieve the interface with digital audio systems via optical connector.

    評估板 AKD4678-B功能:

    • DIR/DIT with optical input/output

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

    • 10pin Header for I2C control mode

    圖4.評估板AKD4678-B方框圖

    圖5.評估板AKD4678-B電路圖(1)

    圖6.評估板AKD4678-B電路圖(2)

    圖7.評估板AKD4678-B電路圖(3)

    圖8.評估板AKD4678-B元件布局圖
    詳情請見:
    ak4678_f01e.pdf (2.3 MB)
    akd4678-b1-00e.pdf (1.23 MB)

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