The PCM2702 is a single chip digital-to-analog con-
verter offering two D/A output channels and an inte-
grated USB 1.0 compliant interface controller. The
newly developed SpAct™ (Sampling Period Adaptive
Controlled Tracking) system recovers a stable, low-
jitter clock for internal PLL and DAC operation from
the USB interface audio data.
The PCM2702 is based upon Burr-Brown’s Enhanced
Multi-level Delta-Sigma Modulator, an 8x
oversampling digital interpolation filter, and an analog
output low-pass filter.
The PCM2702 can accept a 48kHz, 44.1kHz and
32kHz sampling rates, using either 16-bit stereo or
monaural audio data. Digital attenuation and soft-
mute features are included, and are controlled via USB
audio class request.
Patents Pending.
SpAct™ is a trademark of Burr-Brown Corporation.
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
performance is based upon ideal host signal quality, and may vary according to the system. Dynamic performance specifications are tested using a Shibasoku #725
THD Meter with 400Hz HPF, 30kHz LPF, Average Mode, and 20kHz Bandwidth limiting. The load connected to the analog output is 5kΩ, or larger, via AC coupling.
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.
®
PCM2702
2
Top View
SSOP
PIN
1
2
3
4
5
6
7
8
NAME
XTI
V
DD
C
TYPE
IN
—
DESCRIPTIONS
Crystal Oscillator Input.
(1)
Digital Power Supply for Clock Generator,
+3.3V.
Digital Ground for Clock Generator.
Digital Power Supply, +3.3V.
Digital Ground.
USB Differential Input/Output Plus.
USB Differential Input/Output Minus.
USB Bus Power (this pin NEVER consumes
USB bus power).
(2)
Digital Ground for USB Transceiver.
Playback flag, active LOW (LOW: playback,
HIGH: idle).
Suspend flag, active LOW (LOW: suspend,
HIGH: operational).
Zero flag (LOW: Normal, HIGH: ZERO.)
Test pin 3. Connect to digital ground.
(2)
Test pin 2. Connect to digital ground.
(2)
Test pin 1. Connect to digital ground.
(2)
Test pin 0. Connect to digital ground.
(2)
Analog Supply for R-channel, +5V.
Analog Ground for R-channel.
Analog Output for R-channel.
Analog Ground.
DC Common-Mode Voltage for DAC.
Analog Supply, +5V.
Analog Output for L-channel.
Analog Ground for L-channel.
Analog Supply for L-channel, +5V.
Analog Ground for PLL.
Analog Supply for PLL, +5V.
Crystal Oscillator Output.
XTI
V
DD
C
DGNDC
V
DD
DGND
D+
D–
V
BUS
DGNDU
1
2
3
4
5
6
7
PCM2702
8
9
28
27
26
25
24
23
22
21
20
19
18
17
16
15
XTO
V
CC
P
AGNDP
V
CC
L
AGNDL
V
OUT
L
V
CC
V
COM
AGND
V
OUT
R
AGNDR
V
CC
R
TEST0
TEST1
DGNDC
—
V
DD
—
DGND
—
D+
IN/OUT
D–
IN/OUT
V
BUS
IN
—
OUT
OUT
OUT
IN
IN
IN
IN
—
—
OUT
—
—
—
OUT
—
—
—
—
OUT
9 DGNDU
10 PLYBCK
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
SSPND
ZERO
TEST3
TEST2
TEST1
TEST0
V
CC
R
AGNDR
V
OUT
R
AGND
V
COM
V
CC
V
OUT
L
AGNDL
V
CC
L
AGNDP
V
CC
P
XTO
PLYBCK 10
SSPND 11
ZERO 12
TEST3 13
TEST2 14
NOTES: (1) 3.3 V tolerant. (2) Schmitt trigger input with internal pull-down,
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 degrada-
tion 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
324
SPECIFIED
TEMPERATURE
RANGE
0°C to +70°C
PACKAGE
MARKING
PCM2702E
ORDERING
NUMBER
(1)
PCM2702E
PCM2702E/2K
TRANSPORT
MEDIA
Rails
Tape and Reel
PRODUCT
PCM2702E
PACKAGE
SSOP-28
"
"
"
"
"
NOTE: (1) 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 “PCM2702E/2K” will get a single 2000-piece Tape and Reel.
®
3
PCM2702
BLOCK DIAGRAM
PLYBCK
AGNDL
D+
D–
V
BUS
DGNDU
mclk
USB
I/F
USB
Packet
Data
FIFO
wrclk
Audio
Data
8x
Oversampling
Digital Filter
Multi-
Level
Delta-
Sigma
Modulator
V
CC
R
V
CC
L
AGNDR
SSPND
ZERO
DAC
Low-Pass
Filter
V
OUT
L
V
COM
DAC
Low-Pass
Filter
V
OUT
R
rdclk
System Clock
V
DD
C
DGNDC
USB
Clock
Generator
SpAct™
Audio
Clock
Generator
Crystal
OSC
Power Supply
XTI
XTO
V
DD
P
DGNDP
V
CC
AGND
V
DD
DGND
®
PCM2702
4
TYPICAL PERFORMANCE CURVES
All specifications at T
A
= +25°C, V
CC
= V
CC
L = V
CC
R = V
CC
P = 5.0V, V
DD
= V
DD
C = 3.3V, f
S
= 44.1MHz, signal frequency = 1kHz and 16-bit data, unless
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