®
PCM
PCM1740
174
0
For most current data sheet and other product
information, visit www.burr-brown.com
Stereo Audio
DIGITAL-TO-ANALOG CONVERTER
with VCXO and PLL
TM
FEATURES
q
COMPLETE DELTA-SIGMA STEREO DAC
q
VOLTAGE-CONTROLLED CRYSTAL
OSCILLATOR: 27MHz
±
150ppm Output with
0V to 3V Input
q
PROGRAMMABLE PLL
256f
S
or 384f
S
Audio System Clock Output
q
DYNAMIC PERFORMANCE:
Dynamic Range: 94dB
SNR: 94dB
THD+N: –89dB
q
SAMPLING FREQUENCIES:
16kHz, 22.05kHz, 24kHz
32kHz, 44.1kHz, 48kHz
64kHz, 88.2kHz, 96kHz
q
SERIAL AUDIO INTERFACE:
Standard or I
2
S Data Formats
16-, 20-, or 24-Bit Data
q
I
2
C-BUS
®
INTERFACE FOR CONTROL
REGISTERS
(1)
:
Slave Receiver Operation
7-Bit Addressing
Standard Transfer Rate (up to 100kbps)
q
PROGRAMMABLE CONTROLS:
Digital Attenuation (256 steps)
Soft Mute
Infinite Zero Detect Mute
De-Emphasis (32kHz, 44.1kHz, 48kHz)
DAC Output Mode
q
SINGLE +5V SUPPLY
q
SMALL SSOP-24 PACKAGE
NOTE: (1) I
2
C-Bus
®
is a registered trademark of Philips Semiconductor.
DESCRIPTION
The PCM1740 is a complete stereo audio digital-to-analog
converter with on-chip PLL and VCXO. The PCM1740 is
designed specifically for set-top box applications requiring
high-quality audio playback, a precision tuned 27MHz mas-
ter clock source, and support for multiple audio-sampling
frequencies.
The stereo D/A converter utilizes multi-bit, delta-sigma
architecture, which includes an 8x interpolation filter, third-
order noise shaping, 5-level amplitude quantization, and an
analog low-pass filter. The PCM1740 includes a number of
user-programmable functions, which are accessed via a
standard I
2
C-Bus interface.
APPLICATIONS
q
SET-TOP BOXES
q
DIGITAL BROADCAST RECEIVERS
BCK
LRCK
DATA
PCM
Audio
I/F
8x
Oversampling
Digital Filter
and
Sub-Functions
Process
DAC
(L)
DAC
(R)
V
OUT
L
Low-Pass
Filter
and Amp
V
COM
V
OUT
R
ZERO
SCL
SDA
AD1
AD0
XTUN
XT1
27MHz
Crystal
XT2
RST
I
2
C
I/F
and
REGs
Counter N
Counter M
VCXO
Phase
Detector
LPF
VCO
SCKO
(256f
S
/ 384f
S
)
MCKO
(27MHz)
Reset
Power Supply
V
PP
PGND V
CC
AGND V
DD
DGND
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111
Twx: 910-952-1111 • Internet: http://www.burr-brown.com/ • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
®
© 2000 Burr-Brown Corporation
PDS-1551A
1
PCM1740
Printed in U.S.A. February, 2000
BURR-BROWN [ BURR-BROWN CORPORATION ]
