dac3555a Micronas, dac3555a Datasheet - Page 3

• Manufacturer Part Number: dac3555a
• Description: Stereo Audio Dac
• Manufacturer: Micronas

PRELIMINARY DATA SHEET
Stereo Audio DAC
1. Introduction
The DAC 3555A is a single-chip, high-precision, ste-
reo digital-to-analog converter designed for audio
applications. The employed conversion technique is
based on oversampling with noise-shaping. With Mic-
ronas’ unique multibit sigma-delta technique, less sen-
sitivity to clock jitter, high linearity, and a superior S/N
ratio have been achieved. The DAC 3555A is con-
trolled via I
Digital audio input data is received by a versatile I
interface. The analog back-end consists of internal
analog filters and op amps for cost-effective additional
external sound processing. The DAC 3555A provides
line-out, headphone/speaker amplifiers, and volume
control. Moreover, mixing additional analog audio
sources to the D/A-converted signal is supported.
The DAC 3555A is designed for all kinds of applica-
tions in the audio and multimedia field, such as:
MPEG players, CD players, DVD players, CD-ROM
players, mobile phones, etc.
The DAC 3555A ideally complements the MP3 audio
decoders MAS 3507D, MAS 35x9F, and PUC 303xA.
No crystal or external clock required for standard
applications with sample rates from 32 to 48 kHz
and 96 kHz.
It is required for automatic sample rate detection below
32 kHz, MPEG mode (refer to Section 2.10.1.), and
use of clock output CLKOUT.
1.1. Main Features
– no master main input clock required
– no external crystal required
– integrated stereo headphone amplifier and mono
Fig. 1–1: Block diagram of the DAC 3555A
Micronas
SDA
SCL
WSI
DRI
CLI
speaker amplifier
2
C bus.
I
I
2
2
C
S
Inter-
polation
Filter
2
S
DAC
– SNR of 103 dB(A)
– I
– internal clock oscillator
– sample rates from 8 kHz to 96 kHz
– analog deemphasis for 44.1 kHz
– analog volume and balance: +18… 75 dB and mute
– THD better than 0.01%
– two additional analog stereo inputs (AUX) with
– supply range: 2.7 V…5.5 V
– zero-power mode
– additional line-out
– on-chip op amps for cost-effective external analog
– pin-compatible to DAC 3550A
– PMQFP44 or PQFN40 package
1.2. Differences between DAC 3555A and
– new zero-power mode
– operation in I
– new quiet wake-up mode: after power-on, the
– sample rates up to 96 kHz
– not register-compatible to DAC 3550A
source selection and mixing
sound processing
is not supported.
DAC 3555A switches into zero-power mode. Wak-
ing-up is done via I
avoids audible “plops”.
2
C bus, I
DAC 3550A
Analog Inputs
Input
Select
and
Mixing
2
S bus
2
C mode only. Stand-alone operation
2
C command. This feature
Volume
and
Headphone
Amplifier
DAC 3555A
Line Out
OUTR
OUTL
3