ASAHI KASEI
[AK4640]
AK4640
16-Bit
∆Σ
CODEC with MIC/HP/SPK-AMP
GENERAL DESCRIPTION
The AK4640 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 AK4640 is available in a
smaller 57pin BGA in addition to a 52pin QFN that has compatibility with the AK4534/8, utilizing less
board space than competitive offerings.
FEATURES
1. Resolution : 16bits
2. Recording Function
•
Mono Input
•
2 to 1 Selector (Internal and External MIC)
•
1
st
MIC Amplifier : +20dB or 0dB
•
2
nd
Amplifier with ALC : +27.5dB
∼ −8dB,
0.5dB Step
•
ADC Performance : S/(N+D) : 79dB, DR, S/N : 83dB
3. Playback Function
•
Digital De-emphasis Filter (tc=50/15µs, fs=32kHz, 44.1kHz, 48kHz)
•
Digital Volume (0dB
∼
−
127dB, 0.5dB Step, Mute)
•
Headphone-Amp
- S/(N+D) : 70dB, S/N : 90dB
- Output Power : 15mW@16Ω (HVDD=3.3V)
- Click Noise Free at Power ON/OFF
•
Mono Speaker-Amp with ALC
- S/(N+D) : 64dB@150mW, S/N : 90dB
- BTL Output
- ALC circuit
- Output Power : 400mW@8Ω, THD+N=10% (HVDD=3.3V)
•
Mono and Stereo Beep Inputs
4. Phone I/F
•
Full-differential AUX Input
•
Full-differential Mono Output
5. Power Management
6. Master Clock
(1) PLL Mode
•
Frequencies : 11.2896MHz, 12MHz and 12.288MHz
•
Input Level : CMOS
(2) External Clock Mode
•
Frequencies : 2.048MHz
∼
12.288MHz
7. Output Master Clock Frequencies : 32fs/64fs/128fs/256fs
8. Sampling Rate
(1) PLL Mode
•
8kHz, 11.025kHz, 16kHz, 22.05kHz, 24kHz, 32kHz, 44.1kHz, 48kHz
(2) External Clock Mode
•
8kHz
∼
48kHz
9. Control mode: 4-wire Serial / I
2
C Bus
10. Master/Slave mode
MS0273-E-02
-1-
2005/04
AKM [ ASAHI KASEI MICROSYSTEMS ]
