[AK4691]
AK4691
4ch ADC + 2ch DAC with MIC/HP/SPK-AMP
GENERAL DESCRIPTION
The AK4691 is a 16bit, 4ch ADC and 2ch DAC with Microphone-Amplifier, Headphone-Amplifier, and
Speaker-Amplifier. The recording block corresponds to supports 4-channel inputs, and also has 3-input
selector for Internal/External MIC and LINE, output power for Microphone, Pre-Amp, and ALC (Automatic
Level Control) circuit. The playback bock has Lineout-Amplifier, Headphone-Amplifier, and
Speaker-Amplifier. The AK4691 is suitable for portable applications such as built-in LCD. The AK4691 is
available in a 57pin BGA, utilizing less board space than competitive offerings.
FEATURES
1. Recording Function
•
4-channel Single-ended Pre-Amp
(Pre-Amp Gain: 0dB, +18dB, +20dB, +24dB or +28dB)
•
2-channel Line Input
•
3-input Selector (Internal MIC, External MIC or LINE)
•
4-channel Digital ALC (Automatic Level Control)
•
ADC Performance: S/(N+D): 82dB, DR, S/N: 90dB (Pre-Amp=+24dB)
S/(N+D): 85dB, DR, S/N: 90dB (LINE)
•
Wind-noise Reduction Filter
•
Stereo Separation Emphasis
•
Fade-in/out Function
2. Playback Function
•
Digital De-emphasis Filter (tc=50/15μs, fs=32kHz, 44.1kHz, 48kHz)
•
Digital Volume (+12dB
∼ −115.0dB,
0.5dB Step, Mute)
•
Digital ALC (Automatic Level Control)
•
Stereo Separation Emphasis
•
Stereo Line Output
- Performance: S/(N+D): 85dB, S/N: 90dB
- Output Level: -3.9dBV @ AVDD=LVDD=3.0V, LVOL=0dB
+2dBV @ AVDD=3.0V, LVDD=4.5V, LVOL=+5.9dB
•
Stereo Headphone-Amp
- S/(N+D): 70dB, S/N: 90dB
- Output Power: 58mW @ 16Ω (LVDD=3.3V)
- Pop Noise Free at Power ON/OFF
•
Mono Speaker-Amp
- S/(N+D): 50dB@240mW, S/N: 90dB
- BTL Output
- Output Power: 400mW @ 8Ω (SVDD=3.3V)
•
Analog Mixing
3. Power Management
4. Master Clock:
(1) PLL Mode
•
Frequencies:
11.2896MHz, 12MHz, 12.288MHz, 13.5MHz, 24MHz, 27MHz (MCKI pin)
1fs (LRCK pin)
32fs or 64fs (BICK pin)
(2) External Clock Mode
•
Frequencies: 256fs, 512fs or 1024fs (MCKI pin)
5. Output Master Clock Frequencies: 32fs/64fs/128fs/256fs
MS0672-E-00
-1-
2007/11
AKM [ ASAHI KASEI MICROSYSTEMS ]
