[AK4421]

MS0945-E-01

2008/08

- 1 -

GENERAL DESCRIPTION

The AK4421 is 3.3V 24-bit stereo DAC with an integrated 2Vrms output buffer. A charge pump in the

buffer develops an internal negative power supply rail that enables a ground-referenced 2Vrms output.

Using AKM’s multi bit modulator architecture, the AK4421 delivers a wide dynamic range while preserving

linearity for improved THD+N performance. The AK4421 integrates a combination of switched-capacitor

and continuous-time filters, increasing performance for systems with excessive clock jitter. The 24-bit

word length and 192kHz sampling rate make this part ideal for a wide range of consumer audio

applications, such as portable A/V players, set-top boxes, and digital televisions. The AK4421 is offered in

a space saving 16pin TSSOP package.

FEATURES

Sampling Rate Ranging from 8kHz to 192kHz

128 times Oversampling (Normal Speed Mode)

64 times Oversampling (Double Speed Mode)

32 times Oversampling (Quad Speed Mode)

24-Bit 8 times FIR Digital Filter

Switched-Capacitor Filter with High Tolerance to Clock Jitter

Single Ended 2Vrms Output Buffer

Soft mute

I/F format: 24-Bit MSB justified or I

Master clock: 512fs, 768fs or 1152fs (Normal Speed Mode)

256fs or 384fs (Double Speed Mode)

128fs or 192fs (Quad Speed Mode)

THD+N: -92dB (-3dB output level)

Dynamic Range: 102dB

Automatic Power-on Reset Circuit

Power supply: +3.0

∼ +3.6V

Ta = -20 to 85

°C

Small Package: 16pin TSSOP (6.4mm x 5.0mm)

192kHz 24-Bit Stereo

ΔΣ DAC with 2Vrms Output

AK4421

DIF

LRCK

BICK

SDTI

Audio

Data

Interface

MCLK

ΔΣ

Modulator

AOUTL

8X

Interpolator

SCF

LPF

AOUTR

VDD

VSS1

Control

Interface

Clock

Divider

ΔΣ

8X

Interpolator

SCF

LPF

Charge

Pump

CP

CN

VEE

VSS2

CVDD

1μ

1μ

DZF

SMUTE

Modulator