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
∆Σ
modula-
tor, 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 func-
tion and includes selectable features such as soft mute,
digital attenuation and digital de-emphasis.
The PCM1727 is ideal for applications which combine
compressed audio and video data such as DVD, DVD
Audio with CD-DA compatibility, karaoke DSP.
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.
384f
S
PLL2
PLL1
Open Drain
RSTB
OSC
Power Supply
SCKO3 SCKO2 SCKO1
MCKO
XT1 XT2
V
CP
PGND V
CA
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) Sysclk transient is the maximum frequency lock time when the PLL frequency is changed. (2) Dynamic performance specs are tested with 20kHz low
pass filter and THD+N specs are tested with 30kHz LPF, 400Hz HPF, Average-Mode. (3) SNR is tested at Infinite Zero Detection off. (4) PLL evaluations tested
with 1ns maximum jitter on the 27MHz input clock.
®
PCM1727
2
PIN CONFIGURATION
TOP VIEW
SSOP
PIN ASSIGNMENTS
PIN
1
2
3
4
5
6
7
8
9
10
11
NAME
XT1
PGND
V
CP
MCKO
RSV
SCKO3
ML
MC
MD
RSTB
V
OUT
R
AGND
V
CA
V
OUT
L
CAP
ZERO
I/O
IN
—
—
OUT
—
OUT
IN
IN
IN
IN
OUT
—
—
OUT
—
OUT
DESCRIPTION
27MHz Crystal or External Clock Input
PLL Ground
PLL Power Supply (+5V)
Buffered Clock Output of Crystal Oscillator
Reserve; This pin should be open.
System Clock Out 3; This output is 768f
S
or 384f
S
.
Latch Enable Input for Serial Interface Mode
(2)
Bit Clock Input for Serial Interface Mode
(2)
Serial Data Input for Serial Interface Mode
(2)
Reset; When this pin is low, the DF and modu-
lator are held in reset.
Right Channel, Analog Voltage Output of Audio
Signal
Analog Ground
Analog Power Supply (+5V)
Left Channel, Analog Voltage Output of Audio
Signal
Common Pin of Analog Output Amp
Zero Data Flag; This pin is low when the input
data is continuously zero for more than 65,535
cycles of BCKIN
(1)
.
Bit Clock Input for Serial Audio Data
(3)
Serial Audio Data Input
(3)
Left and Right Clock (sampling rate–f
S
)
(3)
System Clock Out 2; This output is 256f
S
or
384f
S
system clock.
System Clock Out 1; This output is 33.8688MHz
system clock.
Digital Power (+5V)
Digital Ground
27MHz Crystal. Connected to GND at external
clock.
XT1
PGND
V
CP
MCKO
RSV
SCKO3
ML
MC
MD
1
2
3
4
5
6
7
8
9
24
23
22
21
20
19
18
17
16
15
14
13
XT2
DGND
V
DD
SCKO1
SCKO2
LRCIN
DIN
BCKIN
ZERO
CAP
V
OUT
L
V
CA
12
13
14
15
16
RSTB 10
V
OUT
R 11
AGND 12
17
18
19
20
PACKAGE DRAWING
NUMBER
(1)
338
21
22
23
24
BCKIN
DIN
LRCIN
SCKO2
SCKO1
V
DD
DGND
XT2
IN
IN
IN
OUT
OUT
—
—
—
PACKAGE INFORMATION
PRODUCT
PCM1727E
PACKAGE
24-Pin SSOP
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
Input Logic Voltage .................................................. –0.3V to (V
DD
+ 0.3V)
Input Current (except power supply) ...............................................
±10mA
Power Dissipation .......................................................................... 300mW
Operating Temperature Range ......................................... –25°C to +85°C
Storage Temperature ...................................................... –55°C to +125°C
Lead Temperature (soldering, 5s) .................................................. +260°C
Thermal Resistance,
θ
JA .......................................................................................
+70°C/W
Note: (1) Open Drain Output. (2) Schmitt triger input with internal pull-up
resistors. (3) Schmitt triger input.
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.
®
3
PCM1727
TYPICAL PERFORMANCE CURVES
At T
A
= +25°C, V
CC
= V
DD
= V
CP
= +5V, f
S
= 44.1kHz, 16-bit input data, 384f
S
, unless otherwise noted. Measurement bandwidth is 20kHz.
