D CLASS HEADPHONE AMPLIFIER WITH BUFFER MEMORY
ML2650
Features
ML2650 is a stereo D-class headphone
amplifier that enables longer battery life of the
portable devices such as mobile phone, music
player and wireless headphone.
The LSI has 64k bytes of SRAM, serial audio
interface, digital volume and high performance
16bit stereo DAC with very small 2.54mm x
2.70mm WCSP package.
Host CPU can be sleep state during ML2650
plays music with internal SRAM. Therefore
total system power is reduced.
D7-D0
CSB
WRB
RDB
ILE
IRQ
Block Diagram
Host
Interface
64KB
SRAM
Delta-Sigma
DAC
Selector
Volume
Class-D
AMP
HPOUTL
LRCLK
BCLK
SAIIN
MCLK
Serial
Audio
Interface
PLL
HPOUTR
CGB
PLLC
SYSCLK
Specifications
Supply Voltage
Clock frequency
HP output power
HP S/N
Output load register
DVDD
IOVDD, HPVDD
PLLVDD
Fclk
Po
SNR
Rload
1.1-1.65
1.65-3.6
2.375-3.6
32k-30M
10
90
16-32
V
V
V
Hz
mW
dB
ohm
Essential Features
•Stereo Audio DAC
•16bit stereo audio delta-sigma DAC
•Sampling frequency:
16/22.05/24/32/44.1/48kHz
•Low power D class headphone amp
•Built in 64KB SRAM for PCM data
•CPU I/F
•8 bit parallel interface for command
and PCM data
•Serial audio I/F
•16bit format master slave selectable
•Package
•36W-CSP(2.54x2.70mm, 0.4mm pitch)
Please refer to ML2650 datasheet for detail.
Typical Application Example
ML2650
CPU
D7-D0
CSB
WRB
RDB
ILE
IRQ
HPOUTL
HPOUTR
HPLVDD
HPRVDD
HPLGND
HPRGND
Refer to application
example circuit below
DSP
LRCLK
BCLK
SAIIN
MCLK
IOVDD
IOVDD
DVDD
DVDD
This C,R parameter
applies for 32.768kHz
SYSCLK input.
220Ω
1500uF
150uF
RESETB
SYSCLK
PLLC
TMODE1
TMODE0
0.1uF
DGND
DGND
0.1uF
0.1uF
0.1uF
PLLVDD
0.1uF
PLLGND
Liner
Regulator
100uF
HPLVDD
HPRVDD
100uH
220uF
HPOUTL
0.1uF
0.1uF
0.1uF
HPLGND
HPRGND
100uH
220uF
HPOUTR
0.1uF
This is a product introduction, not the products’ data sheet. Specification are subject to change without notice.
OKI Electric Industry Co., Ltd., Silicon Solutions Company
Japan: www.okisemi.com/jp/english/, USA: www.okisemi.com/us/, Europe: www.okisemi.com/eu/, Taiwan: www.okisemi.com/tw/,
Hong Kong: www.okisemi.com/hk/, Shanghai: www.okisemi.com/sh/, Singapore: www.okisemi.com/sg/
2007. 11. 28 FEPL2650-01
