The AK4645 is a stereo CODEC with microphone-amplifiers and headphone-amplifiers. The AK4645 features analog mixing circuits and PLL that allows easy interfacing in mobile phone and portable A/V player designs. The AK4645 is available in a 32pin QFN, utilizing less board space than competitive offerings.

Recording Path · 4 Stereo Input Selector · Stereo Microphone Input (Full-differential or Single-ended) · Stereo Line Input · MIC Amplifier (+32dB/+26dB/+20dB or 0dB) · ADC Performance:         S/(N+D): 88dB, DR, S/N: 95dB (MIC-Amp=0dB) Playback Path ·Digital De-emphasis Filter (tc=50/15µs, fs=32kHz,     44.1kHz,48kHz) ·Sound Processing:         Bass Boost, Stereo Separation Emphasis, Programmable EQ         Digital ALC (+36dB ~ -54dB, 0.375dB Step, Mute) · Soft Mute and Digital Volume (+12dB ~ -115.0dB, 0.5dB Step,       Mute) · Stereo Line Output - Performance:          S/(N+D): 88dB, S/N: 92dB · Stereo Headphone-Amp:         S/(N+D): 70dB@7.5mW, S/N: 90dB         Output Power: 70mW@16Ω (HVDD=5V),                                  62mW@16Ω (HVDD=3.3V) - Pop Noise Free at Power ON/OFF · Analog Mixing: 4 Stereo Input Master Clock: · PLL Mode or External Clock Mode - Acceptable Frequencies in PLL mode:         11.2896MHz, 12MHz, 12.288MHz, 13MHz, 13.5MHz,19.2MHz,         24MHz, 26MHz, 27MHz - Acceptable Frequencies in External Clock mode         256fs, 512fs or 1024fs ·Sampling rate: 7.35kHz ~ 48kHz µController I/F:         3-wire serial or I2C Bus (Ver 1.0, 400kHz High Speed Mode) Audio I/F: - Master/Slave mode - Format: MSB First, 2's complement · ADC : 16bit MSB justified, I2S or DSP Mode · DAC : 16bit MSB justified, 16bit LSB justified, 16-24bit I2S,      or DSP Mode Operation Temperature:         Ta = -30 ~ 85°C Power Supply: · AVDD, DVDD: 2.6 ~ 3.6V (typ. 3.3V) · HVDD: 2.6 ~ 5.25V (typ. 3.3V/5.0V) · TVDD (Digital I/O): 1.6 ~ 3.6V (typ. 3.3V) · Power save control available by section Package:         AK4645: 32pin QFN (5mm x 5mm, 0.5mm pitch)         AK4645EZ: 32pin QFN (4mm x 4mm, 0.4mm pitch) Register Configuration: Backward Compatible with AK4644 Applications Mobile Phones Personal Data Assistances (PDA) Personal Media Players (PMP) Portable Navigation Devices (PND) BLOCK DIAGRAM