ASAHI KASEI
[AK4555]
Low Power & Small Package 20bit
∆Σ
CODEC
AK4555
GENERAL DESCRIPTION
The AK4555 is a low voltage 20bit A/D & D/A converter for portable digital audio system. In the AK4555,
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 AK4555 are single-ended, therefore, any external filters are not required.
The AK4555 is suitable for portable digital audio system, as the AK4555 is low power dissipation and a
small package.
FEATURES
HPF for DC-offset cancel (fc=3.4Hz)
Single-ended ADC
- S/(N+D): 80dB@VDD=2.5V
- Dynamic Range, S/N: 89dB@VDD=2.5V
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
Audio I/F format: MSB First, 2’s Compliment
- ADC, DAC: I
2
S
Input/Output Voltage: 0.6 x VDD (=1.5Vpp@VDD=2.5V)
High Jitter Tolerance
Sampling Rate: 8kHz to 50kHz
Master Clock: 256fs/384fs/512fs/768fs (fs=8kHz to 50kHz)
1024fs (fs=8kHz to 25kHz)
Power Supply: 1.6 to 3.6V
Low Power Supply Current: 8.6mA
Ta =
−40
to 85°C
Very Small Package: 16pin TSSOP
VDD
VSS
∆Σ
Modulator
∆Σ
Modulator
Common Voltage
∆Σ
Modulator
∆Σ
Modulator
8X
Interpolator
8X
Interpolator
PWDAN
PWADN
Decimation
Filter
Decimation
Filter
Serial I/O
Interface
Clock
Divider
MCLK
LRCK
SCLK
SDTO
SDTI
DEM0
AOUTL
LPF
DEM1
AINL
AINR
VCOM
AOUTR
LPF
MS0363-E-01
-1-
2005/08
AKM [ ASAHI KASEI MICROSYSTEMS ]
