Burr Brown PCM1725U, PCM1725U-2K Datasheet
®
1
PCM1725
Stereo Audio
DIGITAL-TO-ANALOG CONVERTER
16 Bits, 96kHz Sampling
TM
PCM1725
DESCRIPTION
The PCM1725 is a complete low cost stereo audio
digital-to-analog converter (DAC), operating off of a
256fS or 384fS system clock. The DAC contains a 3rdorder ∆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 consumer audio applications.
®
FEATURES
● COMPLETE STEREO DAC: Includes Digital
Filter and Output Amp
● DYNAMIC RANGE: 95dB
● MULTIPLE SAMPLING FREQUENCIES:
16kHz to 96kHz
● 8X OVERSAMPLING DIGITAL FILTER
● SYSTEM CLOCK: 256f
S
/ 384f
S
● NORMAL OR I2S DATA INPUT FORMATS
● SMALL 14-PIN SOIC PACKAGE
PCM1725
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
Serial
Input
I/F
Mode
Control
I/F
8X Oversampling
Digital Filter
SCKI
256f
S
/384f
S
V
CC
GND
Multi-level
Delta-Sigma
Modulator
V
OUT
L
CAP
DAC
Multi-level
Delta-Sigma
Modulator
Low-pass
Filter
Low-pass
Filter
V
OUT
R
DAC
FORMAT
LRCIN
DIN
BCKIN
DM
Power Supply
© 1997 Burr-Brown Corporation PDS-1373C Printed in U.S.A. January, 1998
®
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PCM1725
SPECIFICATIONS
All specifications at +25°C, +V
CC
= +5V, fS = 44.1kHz, and 16-bit input data, SYSCLK = 384fS, unless otherwise noted.
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
PARAMETER CONDITIONS MIN TYP MAX UNITS
RESOLUTION 16 Bits
DATA FORMAT
Audio Data Interface Format Standard / I
2
S
Audio Data Format Binary Two’s Complement
Sampling Frequency (f
S
) 16 96 kHz
Internal System Clock Frequency 256f
S
/384f
S
DIGITAL INPUT/OUTPUT
Logic Level TTL
Input Logic Level
V
IH
(1)
2.0 VDC
V
IL
(1)
0.8 VDC
Input Logic Current: I
IN
(1)
±0.8 µA
DYNAMIC PERFORMANCE
(2)
f = 991kHz
THD+N at FS (0dB) –83 –78 dB
THD+N at –60dB –32 dB
Dynamic Range A-weighted 90 95 dB
Signal-to-Noise Ratio A-weighted 90 97 dB
Channel Separation 88 95 dB
DC ACCURACY
Gain Error ±1.0 ±5.0 % of FSR
Gain Mismatch, Channel-to-Channel ±1.0 ±5.0 % of FSR
Bipolar Zero Error V
OUT
= VCC/2 at BPZ ±20 ±50 mV
ANALOG OUTPUT
Output Voltage Full Scale (0dB) 0.62 x V
CC
Vp-p
Center Voltage V
CC
/2 VDC
Load Impedance AC Load 10 kΩ
DIGITAL FILTER PERFORMANCE
Passband 0.445 f
S
Stopband 0.555 f
S
Passband Ripple ±0.17 dB
Stopband Attenuation –35 dB
Delay Time 11.125/f
S
sec
INTERNAL ANALOG FILTER
–3dB Bandwidth 100 kHz
Passband Response f = 20kHz –0.16 dB
POWER SUPPLY REQUIREMENTS
Voltage Range 4.5 5 5.5 VDC
Supply Current 13 18 mA
Power Dissipation 65 90 mW
TEMPERATURE RANGE
Operation –25 +85 °C
Storage –55 +125 °C
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.
®
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PCM1725
PIN ASSIGNMENTS
PIN NAME I/O FUNCTION
1
(1)
LRCIN IN Sample Rate Clock Input
2
(1)
DIN IN Audio Data Input
3
(1)
BCKIN IN Bit Clock Input for Audio Data.
4 NC — No Connection
5 CAP — Common Pin of Analog Output Amp
6V
OUT
R OUT Right-Channel Analog Output
7 GND — Ground
8V
CC
— Power Supply
9V
OUT
L OUT Left-Channel Analog Output
10 NC — No Connection
11 NC — No Connection
12
(2)
DM IN De-emphasis Control
HIGH: De-emphasis ON
LOW: De-emphasis OFF
13
(2)
FORMAT — Audio Data Format Select
HIGH: I
2
S Data Format
LOW: Standard Data Format
14 SCKI IN System Clock Input (256f
S
or 384fS)
NOTES: (1) Schmitt Trigger input. (2) Schmitt Trigger input with internal
pull-up.
PIN CONFIGURATION
TOP VIEW SOIC
LRCIN
DIN
BCKIN
NC
CAP
V
OUT
R
GND
SCKI
FORMAT
DM
NC
NC
V
OUT
L
V
CC
1
2
3
4
5
6
7
14
13
12
11
10
9
8
PCM1725
PACKAGE INFORMATION
PACKAGE DRAWING
PRODUCT PACKAGE NUMBER
(1)
PCM1725U 14 Pin SOIC 235
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
+V
CC
to +VDD 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
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.
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