GENERAL DESCRIPTION

The AK4551 is a low voltage 20bit A/D & D/A converter for portable digital audio system. In the AK4551, 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 AK4551 are single-ended, therefore, any external filters are not required. The AK4551 is suitable for portable digital audio system, as the AK4551 is lower power dissipation and a smaller package than AK4519.

FEATURES

□ HPF for DC-offset cancel (fc=3.4Hz)

□ Single-ended ADC

- S/(N+D): 82dB@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 (AK4519 compatible)

- ADC: 20bit MSB justified

- DAC: 20bit LSB justified

□ Input/Output Voltage: 0.6 X VDD (=1.5Vpp@VDD=2.5V)

□ High Jitter Tolerance

□ Sampling Rate: 8kHz to 50kHz

□ Master Clock: 256fs or 384fs or 512fs

□ Power Supply: 2.2 to 3.6V

□ Low Power Supply Current: 10mA

□ Ta = -20 to 85°C

□ Very Small Package: 16pin TSSOP