ASAHI KASEI
[AK4651]
AK4651
16Bit
∆Σ
CODEC with MIC/HP/SPK-AMP
GENERAL DESCRIPTION
The AK4651 targeted at PDA and other low-power, small size applications. It features a 16bit stereo
CODEC with a built-in Microphone-Amplifier, Headphone-Amplifier and Speaker-Amplifier. Input circuits
include a Microphone-Amplifier and an ALC (Auto Level Control) circuit. The AK4651 is connected with
AC’97 controller (CPU) via AC-Link. The AK4651 is available in a very small 57pin BGA, utilizing less
board space than competitive offerings.
FEATURES
1. Resolution: 16bits
2. Recording Function
•
Mono Input (Single-ended or Differential Input)
•
2 to 1 Selector (Internal and External MIC)
•
MIC Power: 2 outputs (Internal and External MIC)
•
1
st
MIC Amplifier: +20dB or 0dB
•
2
nd
Amplifier with ALC: +27.5dB
∼ −8dB,
0.5dB Step
•
ADC Performance (@MIC-Amp=+20dB, Single-ended):
S/(N+D): 79dB, DR, S/N: 83dB
•
MIC Detection
3. Playback Function
•
Digital De-emphasis Filter (tc=50/15µs, fs=32kHz, 44.1kHz, 48kHz)
•
Digital Volume (0dB
∼ −63dB,
0.5dB Step, Mute)
•
Bass Boost
•
Mono Output
- Full-differential Output
- S/(N+D): 85dB, S/N: 95dB
- Analog Volume: +6dB
∼ −15dB,
3dB Step
•
Headphone-Amp
- Output Power: 40mW@16Ω (HVDD=3.3V)
- S/(N+D): 60dB@10mW, S/N: 90dB
•
Headphone Jack Detection
•
Mono Speaker-Amp
- Output Power: 300mW@8Ω (HVDD=3.3V, ALC2=OFF)
- S/(N+D): 55dB@110mW, S/N: 90dB
- BTL Output
- ALC (Auto Level Control) circuit
•
Mono Beep Input
•
AUX Input
- Full-differential Input
- Analog Volume: +12dB
∼ −34.5dB,
1.5dB Step, Mute
•
Stereo Line Input
- Single-ended Input
- Analog Volume: +12dB
∼ −34.5dB,
1.5dB Step, Mute
MS0503-E-00
-1-
2006/04
AKM [ ASAHI KASEI MICROSYSTEMS ]
