ASAHI KASEI [AK4550]
M0068-E-01 2000/4
- 1 -
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
Modulator
MCLK
VDD VSS
AOUTL
AINL
LRCK
SCLK
VCOM
AINR
∆Σ
Modulator
Decimation
Filter
Serial I/O
Interface
Common Voltage
SDTO
∆Σ Decimation
Filter
SDTI
PWDA
DEM0
PWAD
Clock
Divider
AOUTR
8X
Interpolator
8X
Interpolator
∆Σ
Modulator
∆Σ
Modulator
LPF
LPF
DEM1
Low Power & Small Package 16bit ∆Σ CODEC
AK4550