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Stereo Audio
DIGITAL-TO-ANALOG CONVERTER
With Programmable PLL
TM
49%
FPO
PCM1723
FEATURES
● ACCEPTS 16-, 20-, OR 24-BIT INPUT DATA
● COMPLETE STEREO DAC: Includes Digital Filter
and Output Amp
● DYNAMIC RANGE: 94dB
● MULTIPLE SAMPLING FREQUENCIES:
16kHz, 22.05kHz, 24kHz
32kHz, 44.1kHz, 48kHz
64kHz, 88.2kHz, 96kHz
● PROGRAMMABLE PLL CIRCUIT:
256f
S
/384f
S
from 27MHz Master Clock
● NORMAL OR I
2
S™ DATA INPUT FORMATS
● SELECTABLE FUNCTIONS:
Soft Mute
Digital Attenuator (256 Steps)
Digital De-emphasis
● OUTPUT MODE: Left, Right, Mono, Mute
DESCRIPTION
The PCM1723 is a complete, low-cost, stereo audio
digital-to-analog converter (DAC) with a phase-locked
loop (PLL) circuit included. The PLL derives either a
256f
S
or 384f
S
system clock from an external 27MHz
reference frequency. The DAC contains a 3rd-order
delta-sigma (∆Σ) modulator, a digital interpolation filter,
and an analog output amplifier. The PCM1723 can
accept 16-, 20-, or 24-bit input data in either normal or
I
2
S formats.
The digital filter performs an 8X interpolation function
and includes selectable features such as soft mute,
digital attenuation and digital de-emphasis. The PLL
can be programmed for sampling at standard digital
audio frequencies as well as one-half and double
sampling frequencies.
The PCM1723 is ideal for applications which combine
compressed audio and video data such as DVD, DVD-
ROM, set-top boxes and MPEG sound cards.
Serial
Input
I/F
Mode
Control
I/F
8X Oversampling
Digital Filter
with Function
Controller
PLL OSC
256f
S
/384f
S
V
CP
PGND V
CC
AGND
Multi-level
Delta-Sigma
Modulator
V
OUT
L
CAP
Open Drain
DAC
Multi-level
Delta-Sigma
Modulator
Low-Pass
Filter
Low-Pass
Filter
BPZ-Cont.
V
OUT
R
ZERO
DAC
MC
MD
ML
LRCIN
DIN
BCKIN
RSTB
Power Supply
XTI XTO V
DD
DGNDMCKOSCKO
PCM1723E
SBAS057A – JANUARY 1996 – REVISED MAY 2007
www.ti.com
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright © 1996-2007, Texas Instruments Incorporated
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
SoundPLUS is a trademark of Texas Instruments.
I
2
S is a trademark of NXP Semiconductors.
All other trademarks are the property of their respective owners.
