ASAHI KASEI
[AK4550]
Low Power & Small Package 16bit
∆Σ
CODEC
GENERAL DESCRIPTION
The AK4550 is a low voltage 16bit A/D & D/A converter for portable digital audio system. In the AK4550,
the loss of accuracy form clock jitter is also improved by using SCF techniques for on-chip post filter.
Analog signal input/output of the AK4550 are single-ended, therefore, any external filters are not required.
The AK4550 is suitable for portable digital audio system, as the AK4550 is lower power dissipation and a
smaller package than AK4518.
FEATURES
o
HPF for DC-offset cancel (fc=3.4Hz)
o
Single-ended ADC
- S/(N+D): 82dB@VDD=2.5V
- Dynamic Range, S/N: 89dB@VDD=2.5V
o
Single-ended DAC
- Digital de-emphasis for 32kHz, 44.1kHz, 48kHz sampling
- S/(N+D): 85dB@VDD=2.5V
- Dynamic Range, S/N: 92dB@VDD=2.5V
o
Audio I/F format: MSB First, 2’s Compliment (AK4518 compatible)
- ADC: 16bit MSB justified
- DAC: 16bit LSB justified
o
Input/Output Voltage: 0.6 X VDD (=1.5Vpp@VDD=2.5V)
o
High Jitter Tolerance
o
Sampling Rate: 8kHz to 50kHz
o
Master Clock: 256fs or 384fs or 512fs
o
Power Supply: 2.3 to 3.6V
o
Low Power Supply Current: 10mA
o
Ta = -40 to 85°C
o
Very Small Package: 16pin TSSOP
VDD
VSS
∆Σ
Modulator
∆Σ
Modulator
Common Voltage
∆Σ
Modulator
∆Σ
Modulator
8X
Interpolator
8X
Interpolator
PWDA
PWAD
Decimation
Filter
Decimation
Filter
Serial I/O
Interface
Clock
Divider
MCLK
LRCK
SCLK
SDTO
SDTI
DEM0
AOUTL
LPF
DEM1
AK4550
AINL
AINR
VCOM
AOUTR
LPF
M0068-E-01
-1-
2000/4
AKM [ ASAHI KASEI MICROSYSTEMS ]
