The AK4950 is a 24bit stereo CODEC with a microphone, speaker and headphone amplifiers. 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. The integrated charge pump generates an internal negative power supply rail and removes the output coupling capacitor. A one channel composite In/Out video amplifier is also integrated. Digital sound processing is provided by the internal DSP. The AK4950 is available in a small 32pin QFN (4mm 4mm, 0.4mm pitch), saving more board space.

1. Applications: DSCs, DVCs
2. 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: +35.625dB ~ -54dB, 0.375dB Step)
   · ADC Performance: S/(N+D): 83dB, DR, S/N: 88dB (MIC-Amp=+18dB)
   S/(N+D): 85dB, DR, S/N: 96dB (MIC-Amp=0dB)
   · MIC Sensitivity Compensation
   · Wind-noise Reduction Filter
   · 4 Band Notch Filter
   · Stereo Separation Emphasis Circuit
   · Digital MIC Interface
3. Playback Functions
   · Digital De-emphasis Filter (tc=50/15s, fs=32kHz, 44.1kHz, 48kHz)
   · Digital ALC (Automatic Level Control)
   (Setting Range: +35.625dB ~ -54dB, 0.375dB Step)
   · Digital Volume Control (+12dB ~ -78dB, 0.375dB Step)
   · Stereo Separation Emphasis Circuit
   · Stereo Line Output
   - S/(N+D): 83dB, S/N: 92dB
   · Mono Mixing Output
   · Mono Speaker-Amplifier
   - SPK-Amp Performance: S/(N+D): 75dB@150mW, 70dB@250mW,
   S/N: 95dB
   - Thermal Shut-down
   - BTL Output
   - Output Power: 400mW@8 (SVDD=3.3V)
   · Analog Mixing: Mono Input
4. Power Management
5. Master Clock:
   (1) PLL Mode
   · Frequencies: 11.2896MHz, 12MHz, 13.5MHz, 24MHz, 25MHz, 27MHz (MCKI pin)
   32fs or 64fs (BICK pin)
   (2) External Clock Mode
   · Frequencies: 512fs or 1024fs (MCKI pin)
6. Output Master Clock Frequencies: 32fs/64fs/128fs/256fs
   · 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 (512fs), 7.35kHz ~ 13kHz (1024fs)
7. P I/F: 3-wire Serial, I²C Bus (Ver 1.0, 400kHz Fast-Mode)
8. Master/Slave mode
9. 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
10. 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
11. Ta = -30 ~ 85°C
12. Power Supply:
    · Analog Power Supply (AVDD): 2.7 ~ 3.6V
    · Digital I/O Power Supply (TVDD): 1.6 ~ 3.6V
13. Package: 32pin QFN (4 4mm, 0.4mm pitch)
14. Evaluation Board: AKD4950