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 PCM1720 can accept
16-, 20-, or 24-bit input data in either normal or I
2
S
formats.
The digital filter performs an 8X interpolation func-
tion and includes selectable features such as soft mute,
digital attenuation and digital de-emphasis. The
PCM1720 can accept standard digital audio sampling
frequencies as well as one-half and double sampling
frequencies.
The PCM1720 is ideal for applications which combine
compressed audio and video data such as DVD, DVD-
ROM, set-top boxes and MPEG sound cards.
BCKIN
LRCIN
DIN
Serial
Input
I/F
8X Oversampling
Digital Filter
with Function
Controller
Multi-level
Delta-Sigma
Modulator
DAC
Low-pass
Filter
V
OUT
L
CAP
Multi-level
Delta-Sigma
Modulator
Low-pass
Filter
V
OUT
R
ML
MC
MD
Mode
Control
I/F
DAC
ZERO
BPZ-Cont.
Open Drain
RSTB
256f
S
/384f
S
Power Supply
SCKI
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
NOTES: (1) Dynamic performance specs are tested with 20kHz low pass filter and THD+N specs are tested with 30kHz LPF, 400Hz HPF, Average-Mode. (2) SNR
is tested with Infinite Zero Detection off.
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.
®
PCM1720
2
PIN CONFIGURATION
TOP VIEW
SSOP
PIN ASSIGNMENTS
PIN
1
2
NAME
NC
SCKI
TEST
ML
MC
MD
RSTB
ZERO
TYPE
—
IN
OUT
IN
IN
IN
IN
OUT
FUNCTION
No Connection.
System Clock Input: 256f
S
or 384f
S
.
Reserved for Factory Use.
Latch Enable for Serial Control Data.
Clock for Serial Control Data.
Data Input for Serial Control.
Reset Input. When this pin is low, the digital
filters and modulators are held in reset.
Zero Data Flag. This pin is low when the data is
continuously zero for more than 65,535 cycles of
BCKIN.
Right Channel Analog Output.
Analog Ground.
Analog Power Supply (+5V).
Left Channel Analog Output.
Common Pin for Analog Output Amplifiers.
Bit Clock for Clocking in the Audio Data.
Serial Audio Data Input.
Left/Right Word Clock. Frequency is equal to fs.
Ground.
No Connection.
Digital Power Supply (+5V). Recommended con-
nection is to the analog power supply.
Digital Ground. Recommended connection is to
the digital ground plane.
NC
SCKI
TEST
ML
MC
MD
RSTB
ZERO
V
OUT
R
1
2
3
4
5
6
7
8
9
20
19
18
17
16
15
14
13
12
11
DGND
V
DD
NC
GND
LRCIN
DIN
BCKIN
CAP
V
OUT
L
V
CC
3
4*
5*
6*
7*
8
9
10
11
12
13
14*
15*
16*
17
18
V
OUT
R
AGND
V
CC
V
OUT
L
CAP
BCKIN
DIN
LRCIN
GND
NC
V
DD
DGND
OUT
PWR
PWR
OUT
—
IN
IN
IN
PWR
—
PWR
PWR
AGND 10
PACKAGE INFORMATION
PRODUCT
PCM1720
PACKAGE
20-Pin SSOP
PACKAGE DRAWING
NUMBER
(1)
334-1
19
20
* These pins include internal pull-up resistors.
NOTE: (1) For detailed drawing and dimension table, please see end of data
sheet, or Appendix C of Burr-Brown IC Data Book.
ABSOLUTE MAXIMUM RATINGS
Power Supply Voltage ....................................................................... +6.5V
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ADI Reference Circuit
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