®
PCM
172
5
PCM1725
Stereo Audio
DIGITAL-TO-ANALOG CONVERTER
16 Bits, 96kHz Sampling
TM
FEATURES
q
COMPLETE STEREO DAC: Includes Digital
Filter and Output Amp
q
DYNAMIC RANGE: 95dB
q
MULTIPLE SAMPLING FREQUENCIES:
16kHz to 96kHz
q
8X OVERSAMPLING DIGITAL FILTER
q
SYSTEM CLOCK: 256f
S
/ 384f
S
q
NORMAL OR I
2
S DATA INPUT FORMATS
q
SMALL 14-PIN SOIC PACKAGE
DESCRIPTION
The PCM1725 is a complete low cost stereo audio
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 PCM1725 accepts
16-bit input data in either normal or I
2
S formats.
The digital filter performs an 8X interpolation function
and includes de-emphasis at 44.1kHz. The PCM1725
can accept digital audio sampling frequencies from
16kHz to 96kHz, always at 8X oversampling.
The PCM1725 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
Internet: http://www.burr-brown.com/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
®
© 1997 Burr-Brown Corporation
PDS-1373C
1
Printed in U.S.A.
PCM1725
January, 1998
SBAS067
SPECIFICATIONS
All specifications at +25°C, +V
CC
= +5V, f
S
= 44.1kHz, and 16-bit input data, SYSCLK = 384f
S
, unless otherwise noted.
PCM1725
PARAMETER
RESOLUTION
DATA FORMAT
Audio Data Interface Format
Audio Data Format
Sampling Frequency (f
S
)
Internal System Clock Frequency
DIGITAL INPUT/OUTPUT
Logic Level
Input Logic Level
V
IH(1)
V
IL(1)
Input Logic Current: I
IN(1)
DYNAMIC PERFORMANCE
(2)
THD+N at FS (0dB)
THD+N at –60dB
Dynamic Range
Signal-to-Noise Ratio
Channel Separation
DC ACCURACY
Gain Error
Gain Mismatch, Channel-to-Channel
Bipolar Zero Error
ANALOG OUTPUT
Output Voltage
Center Voltage
Load Impedance
DIGITAL FILTER PERFORMANCE
Passband
Stopband
Passband Ripple
Stopband Attenuation
Delay Time
INTERNAL ANALOG FILTER
–3dB Bandwidth
Passband Response
POWER SUPPLY REQUIREMENTS
Voltage Range
Supply Current
Power Dissipation
TEMPERATURE RANGE
Operation
Storage
f = 991kHz
–83
–32
95
97
95
±1.0
±1.0
±20
–78
dB
dB
dB
dB
dB
% of FSR
% of FSR
mV
CONDITIONS
MIN
TYP
16
Standard /I
2
S
Binary Two’s Complement
16
256f
S
/384f
S
TTL
2.0
0.8
±0.8
VDC
VDC
µA
96
kHz
MAX
UNITS
Bits
A-weighted
A-weighted
90
90
88
V
OUT
= V
CC
/2 at BPZ
±5.0
±5.0
±50
Full Scale (0dB)
AC Load
10
0.62 x V
CC
V
CC
/2
Vp-p
VDC
kΩ
0.445
f
S
f
S
dB
dB
sec
kHz
dB
5.5
18
90
+85
+125
VDC
mA
mW
°C
°C
0.555
±0.17
–35
11.125/f
S
100
–0.16
4.5
5
13
65
f = 20kHz
–25
–55
NOTES: (1) Pins 1, 2, 3, 12, 13: LRCIN, DIN, BCKIN, DM, FORMAT (Schmitt Trigger Input); Pin 14: 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.
®
PCM1725
2
PIN CONFIGURATION
TOP VIEW
SOIC
PIN ASSIGNMENTS
PIN
1
(1)
2
(1)
3
(1)
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
Audio Data Format Select
HIGH: I
2
S Data Format
LOW: Standard Data Format
System Clock Input (256f
S
or 384f
S
)
LRCIN
DIN
BCKIN
NC
CAP
V
OUT
R
GND
1
2
3
4
5
6
7
PCM1725
14
13
12
11
10
9
8
SCKI
FORMAT
DM
NC
NC
V
OUT
L
V
CC
4
5
6
7
8
9
10
11
12
(2)
13
(2)
FORMAT
—
PACKAGE INFORMATION
PRODUCT
PCM1725U
PACKAGE
14 Pin SOIC
PACKAGE DRAWING
NUMBER
(1)
235
14
SCKI
IN
NOTES: (1) Schmitt Trigger input. (2) Schmitt Trigger input with internal
pull-up.
NOTE: (1) For detailed drawing and dimension table, please see end of data
sheet, or Appendix C of Burr-Brown IC Data Book.
ELECTROSTATIC
DISCHARGE SENSITIVITY
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.
ABSOLUTE MAXIMUM RATINGS
Power Supply Voltage ....................................................................... +6.5V
+V
CC
to +V
DD
Difference ...................................................................
±0.1V
Input Logic Voltage .................................................. –0.3V to (V
DD
+ 0.3V)
Power Dissipation .......................................................................... 290mW
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
.............................................................. +90°C/W
®
3
PCM1725
TYPICAL PERFORMANCE CURVES
At T
A
= +25°C, +V
CC
= +5V, f
S
= 44.1kHz, SYSCLK = 256f
S
, unless otherwise noted.
DYNAMIC PERFORMANCE
THD+N vs TEMPERATURE
0.009
0.008
0.007
THD+N at 0dB (%)
SNR, DYNAMIC RANGE vs TEMPERATURE
3.2
3.1
THD+N at –60dB (%)
99
98
97
99
98
97
96
95
94
93
0
25
50
75
85
100
Temperature (°C)
0.006
0.005
0.004
0.003
0.002
0.001
0
–25
0
25
50
75
85
100
–60dB
2.9
2.8
2.7
2.6
2.5
2.4
2.3
Temperature (°C)
96
95
94
93
–25
Dynamic Range
THD+N vs POWER SUPPLY
0.009
0.008
0.007
THD+N at 0dB (%)
SNR, DYNAMIC RANGE vs POWER SUPPLY
3.2
3.1
99
98
THD+N at –60dB (%)
99
98
97
96
95
Dynamic Range
94
93
4.5
4.75
5.0
V
CC
(V)
0.006
0.005
0.004
0.003
0.002
0.001
0
4.5
4.75
5.0
V
CC
(V)
5.25
5.5
–60dB
2.9
2.8
2.7
2.6
2.5
2.4
2.3
97
96
95
94
93
5.25
5.5
THD+N vs SAMPLING RATE
0.016
0.014
THD+N at 0dB (%)
SNR, DYNAMIC RANGE vs SAMPLING RATE
5.2
4.7
THD+N AT –60dB (%)
98
97
96
95
SNR
98
97
96
95
94
93
Dynamic Range
92
91
90
89
88
44.1
48
88.2
96
Sampling Rate (kHz)
0.012
0.01
0.008
0.006
–60dB
0.004
44.1
48
88.2
96
0dB
4.2
3.7
3.2
2.7
2.2
94
93
92
91
90
89
88
Sampling Rate (kHz)
®
PCM1725
4
Dynamic Range (dB)
SNR (dB)
Dynamic Range (dB)
0dB
3.0
SNR
SNR (dB)
Dynamic Range (dB)
0dB
3.0
SNR
SNR (dB)
TYPICAL PERFORMANCE CURVES
At T
A
= +25°C, +V
CC
= +V
DD
= +5V, f
S
= 44.1kHz, and 16-bit input data, SYSCLK = 384f
S
, unless otherwise noted.
DIGITAL FILTER
OVERALL FREQUENCY CHARACTERISTIC
0
0
PASSBAND RIPPLE CHARACTERISTIC
–20
–0.2
–40
dB
–0.4
dB
–60
–0.6
–80
–0.8
–100
0 0.4536f
S
1.3605f
S
2.2675f
S
3.1745f
S
4.0815f
S
Frequency (Hz)
–1
0
0.1134f
S
0.2268f
S
Frequency (Hz)
0.3402f
S
0.4535f
S
DE-EMPHASIS FREQUENCY RESPONSE (44.1kHz)
0
–2
–4
Level (dB)
DE-EMPHASIS FREQUENCY ERROR (44.1kHz)
0.6
0.4
0.2
–6
–8
–10
–12
0
5
10
15
20
25
Frequency (kHz)
Error (dB)
0.0
–0.2
–0.4
–0.6
0
4999.8375
9999.675
Frequency (kHz)
14999.5125
19999.35
®
5
PCM1725
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