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Serial
Input
I/F
Mode
Control
I/F
8X Oversampling
Digital Filter
with Function
Controller
PLL2
PLL1
OSC
384f
S
V
CP
PGND V
CA
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
XT1 XT2 V
DD
DGNDMCKO
SCKO1SCKO2SCKO3
Stereo Audio
DIGITAL-TO-ANALOG CONVERTER
With Programmable Dual PLL
TM
49%
FPO
PCM1727
FEATURES
● ACCEPTS 16-, 20-, OR 24-BIT INPUT DATA
● COMPLETE STEREO DAC: Includes Digital Filter
and Output Amp
● DYNAMIC RANGE: 92dB
● MULTIPLE SAMPLING FREQUENCIES:
f
S
= 44.1kHz, 48kHz, 96kHz
● PROGRAMMABLE DUAL PLL CIRCUIT:
27MHz Master Clock Input
● GENERATED SYSTEM CLOCK
SCKO1: 33.8688MHz
SCKO2: 384f
S
SCKO3: 768f
S
(44.1k/48kHz)
384f
S
(96kHz)
● NORMAL OR I
2
S™ DATA INPUT FORMATS
● SELECTABLE FUNCTIONS:
Soft Mute, Analog Output Mode
Digital Attenuator (256 Steps)
Digital De-Emphasis
● +5V SINGLE POWER SUPPLY
DESCRIPTION
The PCM1727 is a complete, low-cost, stereo audio digital-
to-analog converter (DAC) with a dual phase-locked loop
(PLL) circuit included. PLL-1 derives a fixed 33.8688MHz
(768f
S
, f
S
= 44.1kHz) system clock (SCKO-1), and PLL-2
derives both the 384f
S
(f
S
= 44.1k/48k/96kHz) system
clock (SCKO-2) and the 768f
S
(f
S
= 44.1k/48kHz)/384f
S
(f
S
= 96kHz) system clock (SCKO-3) 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 PCM1727 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 PCM1727 is ideal for applications that combine
compressed audio and video data such as DVD, DVD
Audio with CD-DA compatibility, and karaoke DSP.
PC
M
1727E
SBAS077A – JANUARY 1997 – 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 © 1997-2004, 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.
