[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
AKM [ ASAHI KASEI MICROSYSTEMS ]
