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: I2S
□ 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