[AK4421]
AK4421
192kHz 24-Bit Stereo
ΔΣ
DAC with 2Vrms Output
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
2
S
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)
MCLK
VDD
DZF
VSS1
SMUTE
DIF
Control
Interface
Clock
Divider
ΔΣ
Modulator
ΔΣ
Modulator
LRCK
BICK
SDTI
Audio
Data
Interface
8X
Interpolator
8X
Interpolator
Charge
Pump
CP
1μ
CN
SCF
LPF
SCF
LPF
AOUTL
AOUTR
VEE
1μ
VSS2
CVDD
MS0945-E-01
-1-
2008/08
AKM [ ASAHI KASEI MICROSYSTEMS ]
