digital-to-analog converter (DAC), operating off of a
256f
S
or 384f
S
system clock. The DAC contains a 3rd-
order
∆Σ
modulator, a digital interpolation filter, and
an analog output amplifier. The PCM1744 accepts
24-bit input data in a I
2
S format.
The digital filter performs an 8x interpolation function
and includes de-emphasis at 44.1kHz. The PCM1744
can accept digital audio sampling frequencies from
16kHz to 96kHz, always at 8X oversampling.
The PCM1744 is ideal for low-cost, CD-quality con-
sumer audio applications.
BCKIN
LRCIN
DIN
Serial
Input
I/F
8X Oversampling
Digital Filter
Multi-level
Delta-Sigma
Modulator
DAC
Low-pass
Filter
V
OUT
L
CAP
Multi-level
Delta-Sigma
Modulator
Low-pass
Filter
V
OUT
R
DAC
FORMAT
Mode
Control
I/F
Power Supply
DM
256f
S
/384f
S
SCKI
V
CC
GND
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
NOTES: (1) Pins 1, 2, 3, 12, 13, 14: LRCIN, DIN, BCKIN, DM, FORMAT, SCKI. (2) Dynamic performance specs are tested with 20kHz low pass filter and THD+N
specs are tested with 30kHz LPF, 400Hz HPF, Average-Mode.
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes
no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant
any BURR-BROWN product for use in life support devices and/or systems.
®
PCM1744
2
PIN CONFIGURATION
TOP VIEW
SOIC
PIN ASSIGNMENTS
PIN
1
(1)
2
(1)
3
(1)
4
NAME
LRCIN
DIN
BCKIN
NC
CAP
V
OUT
R
GND
V
CC
V
OUT
L
NC
NC
DM
I/O
IN
IN
IN
—
—
OUT
—
—
OUT
—
—
IN
FUNCTION
Sample Rate Clock Input
Audio Data Input
Bit Clock Input for Audio Data.
No Connection
Common Pin of Analog Output Amp
Right-Channel Analog Output
Ground
Power Supply
Left-Channel Analog Output
No Connection
No Connection
De-Emphasis Control
HIGH: De-emphasis ON
LOW: De-emphasis OFF
Test Pin. Must be left open.
System Clock Input (256f
S
or 384f
S
)
LRCIN
DIN
BCKIN
NC
CAP
V
OUT
R
GND
1
2
3
4
5
6
7
PCM1744
14
13
12
11
10
9
8
SCKI
TEST
5
6
7
DM
NC
NC
V
OUT
L
V
CC
8
9
10
11
12
(2)
13
(2)
14
(1)
TEST
SCKI
—
IN
NOTE: (1) Schmitt-Trigger input. (2) Schmitt-Trigger input with internal pull-up.
ABSOLUTE MAXIMUM RATINGS
Power Supply Voltage ...................................................................... +6.5V
This integrated circuit can be damaged by ESD. Burr-Brown
recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling
and installation procedures can cause damage.
ESD damage can range from subtle performance degradation
to complete device failure. Precision integrated circuits may
be more susceptible to damage because very small parametric
changes could cause the device not to meet its published
specifications.
PACKAGE/ORDERING INFORMATION
PACKAGE
DRAWING
NUMBER
(1)
235
"
SPECIFIED
TEMPERATURE
RANGE
–25°C to +85°C
"
PACKAGE
MARKING
PCM1744U
PCM1744U
ORDERING
NUMBER
(2)
PCM1744U
PCM1744U/2K
TRANSPORT
MEDIA
Rails
Tape and Reel
PRODUCT
PCM1744
"
PACKAGE
SO-14
"
NOTES: (1) For detailed drawing and dimension table, please see end of data sheet, or Appendix C of Burr-Brown IC Data Book, or visit the Burr-Brown web site
at www.burr-brown.com. (2) Models with a slash (/) are available only in Tape and Reel in the quantities indicated (e.g., /2K indicates 2000 devices per reel). Ordering
2000 pieces of “PCM1744U/2K” will get a single 2500-piece Tape and Reel. For detailed Tape and Reel mechanical information, refer to Appendix B of Burr-Brown
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Test/Measurement
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