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| AKM AK4955带录音播放功能24位立体声CODEC解决方案 | |||||
作者：AKM 文章来源：AKM 点击数： 更新时间：2012-1-16  |
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The AK4955 is a 24bit stereo CODEC with a microphone amplifier, speaker amplifier, video amplifier, LDO, and DSP. The input circuits include a microphone amplifier and the output circuits include a speaker amplifier. It is suitable for portable application with recording/playback function. A one channel composite In/Out video amplifier is also integrated. The internal charge pump generates a negative power eliminating the need for AC-coupling capacitors. The AK4955 is available in a small 36pin CSP (3.0mm  3.1mm, 0.5mm pitch), saving mounting area on the board.Applications: DSCs, DVCs AK4955主要特性： Recording Functions · Stereo Single-ended input with two Selectors · MIC Amplifier (+24dB/+21dB/+18dB/+16dB/+14dB/+11dB/+8dB/+5dB/0dB) · Digital ALC (Automatic Level Control) (Setting Range: +36dB ~ -54dB, 0.375dB Step) · ADC Performance: S/(N+D): 81dB, DR, S/N: 88dB (MIC-Amp=+18dB)S/(N+D): 82dB, DR, S/N: 96dB (MIC-Amp=0dB) · 5 Band Notch Filter · Digital MIC Interface Playback Functions · Digital De-emphasis Filter (tc=50/15  s, fs=32kHz, 44.1kHz, 48kHz)· Soft Mute · Digital ALC (Automatic Level Control)(Setting Range: +36dB ~ -54dB, 0.375dB Step) · Digital Volume Control (+12dB ~ -115dB, 0.5dB Step, Mute) · Stereo Emphasis Circuit · Stereo Line Output Output Voltage: +2dBV(1.26Vrms) (LVDD = 4.8V)2.52Vpp (LVDD=3.3V) -S/(N+D): 85dB, S/N: 92dB · Mono Mixing Output · Mono Speaker-Amplifier SPK-Amp Performance: S/(N+D): 70dB@150mW, 60dB@250mW, S/N: 95dB - BTL Output - Output Power: 600mW@8  (SVDD=4.8V) 400mW@8 (SVDD=3.3V)· Analog Mixing: Mono Input · Beep Sound Power Management · Thermal Shut-down Function Master Clock: (1) PLL Mode · Frequencies: 11.2896MHz, 12MHz, 13.5MHz, 24MHz, 27MHz (MCKI pin) 32fs or 64fs (BICK pin) (2) External Clock Mode · Frequencies: 256fs, 512fs or 1024fs (MCKI pin) Output Master Clock Frequencies: 32fs/64fs/128fs/256fs Sampling Frequency · PLL Slave Mode (BICK pin): 7.35kHz ~ 48kHz · PLL Slave Mode (MCKI pin): 8kHz, 11.025kHz, 12kHz, 16kHz, 22.05kHz, 24kHz, 32kHz, 44.1kHz, 48kHz · PLL Master Mode: 8kHz, 11.025kHz, 12kHz, 16kHz, 22.05kHz, 24kHz, 32kHz, 44.1kHz, 48kHz · EXT Master/Slave Mode: 7.35kHz ~ 48kHz (256fs, 512fs), 7.35kHz ~ 13kHz (1024fs) P I/F: 3-wire Serial, I2C Bus (Ver 1.0, 400kHz Fast-Mode) Master/Slave mode Audio Interface Format: MSB First, 2’s complement · ADC: 24bit MSB justified, 16/24bit I2S · DAC: 24bit MSB justified, 16bit LSB justified, 24bit LSB justified, 16/24bit I2S Video Functions · One Composite Signal Input · Capacitor-less Video Amplifier for Composite Signal Output Gain: +6 / +9 / +12 / +16.5dB · LPF · Charge Pump Circuit for Negative Power Supply Ta = -30 ~ 85℃ Power Supply: · Analog Power Supply (AVDD): 2.7 ~ 3.6V · Digital Power Supply (DVDD): 1.6 ~ 2.0V · Line Output Power Supply (LVDD): 2.7 ~ 5.5V · Speaker Power Supply (SVDD): 2.7 ~ 5.5V · Digital I/O Power Supply (TVDD): -0.2 ~ 3.6V Package: 36pin QFN (3.0 3.1mm, 0.5mm pitch) Evaluation Board: AKD4955  图1。AK4955方框图 AKD4955-A评估板 The AKD4955-A is an evaluation board for AK4955, 24bit stereo CODEC with a microphone/ speaker/ video amplifiers, DSP and LDO. The AKD4955-A has the Digital Audio I/F and can achieve the interface with digital audio systems via optical connector.  图2。AKD4955-A评估板方框图  图3。AKD4955-A评估板电路图（1）  图4。AKD4955-A评估板电路图（2）  图5。AKD4955-A评估板电路图（3）  图6。AKD4955-A评估板电路图（4）  图7。AKD4955-A评估板电路图（5）  图8。AKD4955-A评估板电路图（6）  图9。AKD4955-A评估板电路图（7）  图10。AKD4955-A评估板PCB布局图 详情请见： http://www.asahi-kasei.co.jp/akm/en/product/ak4950/ak4950_f00e.pdf 和 http://www.asahi-kasei.co.jp/akm/en/product/ak4955/akd4955-a1-03e.pdf |
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