AK4950 Datasheet, PDF (1/106 Pages) Asahi Kasei Microsystems – 24bit Stereo CODEC with MIC/SPK/Cap-less VIDEO-AMP & mini DSP

[AK4950]
AK4950
24bit Stereo CODEC with MIC/SPK/Cap-less VIDEO-AMP & mini DSP
GENERAL DESCRIPTION
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 x 4mm, 0.4mm pitch), saving more board space.
FEATURES
1. 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
2. Playback Functions
• Digital De-emphasis Filter (tc=50/15μs, 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@8Ω (SVDD=3.3V)
• Analog Mixing: Mono Input
3. Power Management
4. 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)
MS1320-E-00
-1-
2011/10