®
PCM1728
49%
PCM1728
FPO
24-Bit, 96kHz Sampling
TM
CMOS Delta-Sigma Stereo Audio
DIGITAL-TO-ANALOG CONVERTER
FEATURES
● ENHANCED MULTI-LEVEL DELTA-SIGMA DAC
● SAMPLING FREQUENCY (fS): 16kHz - 96kHz
● INPUT AUDIO DATA WORD:
16-, 20-, 24-Bit
● HIGH PERFORMANCE:
THD+N: –96dB
Dynamic Range: 106dB
SNR: 106dB
Analog Output Range: 0.62 x VCC (Vp-p)
● 8x OVERSAMPLING DIGITAL FILTER:
Stop Band Attenuation: –82dB
Passband Ripple: ±0.002dB
● MULTI FUNCTIONS:
Digital De-emphasis
Soft Mute
Zero Flag
● +5V SINGLE SUPPLY OPERATION
● SMALL 28-LEAD SSOP PACKAGE
DESCRIPTION
The PCM1728 is designed for mid- to high-grade
digital audio applications which achieve 96kHz sampling rates with 24-bit audio data. PCM1728 uses a
newly developed, enhanced multi-level delta-sigma
modulator architecture that improves audio dynamic
performance and reduces jitter sensitivity in actual
applications. The internal digital filter operates at 8X
oversampling at a 96kHz sampling rate.
The PCM1728 has superior audio dynamic performance, 24-bit resolution, and 96kHz sampling, making it ideal for mid- to high-grade audio applications
such as CD, DVD, and musical instruments.
L
R
CC2
CC2
V
V
AGND2L
AGND2L
V
BCKIN
LRCIN
DIN
2
S
I
DM1
DM0
IW0
IW1
MUTE
RST
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
© 1998 Burr-Brown Corporation PDS-1453A Printed in U.S.A. April, 1998
Serial
Input
I/F
Mode
Control
DAC
8X Oversampling
Digital Filter with
Function
Controller
I/F
SCK
XTI
Crystal/OSC
XTO CLKO V
Enhanced
Multi-level
Delta-Sigma
Modulator
DAC
Power Supply
AGND1 VDDDGND
CC1
Low-pass
Filter
Low-pass
Filter
Open Drain
OUT
EXTL
V
OUT
EXTR
ZERO
L
R
SPECIFICATIONS
All specifications at +25°C, +VCC = +V
PARAMETER CONDITIONS MIN TYP MAX UNITS
RESOLUTION 24 Bits
DATA FORMAT
Audio Data Interface Format Standard/I2S
Data Bit Length 16/20/24 Selectable
Audio Data Format MSB-First, Two’s Binary Comp
Sampling Frequency (f
System Clock Frequency
) 16 96 kHz
S
(1)
DIGITAL INPUT/OUTPUT LOGIC LEVEL
Input Logic Level V
V
Output Logic Level (CLKO) V
CLKO PERFORMANCE
OH
V
(2)
Output Rise Time 20 ~ 80% VDD, 10pF 5.5 ns
Output Fall Time 80 ~ 20% V
Output Duty Cycle 10pF Load 37 %
DYNAMIC PERFORMANCE
(3)
THD+N V
V
Dynamic Range f
Signal-to-Noise Ratio f
Channel Separation fS = 44.1kHz 96 102 dB
DYNAMIC PERFORMANCE
(3)
THD+N V
Dynamic Range f
DC ACCURACY
Gain Error ±1.0 ±3.0 % of FSR
Gain Mismatch: Channel-to-Channel ±1.0 ±3.0 % of FSR
Bipolar Zero Error V
ANALOG OUTPUT
Output Voltage Full Scale (0dB) 0.62 V
Center Voltage 0.5 V
Load Impedance AC Load 5 kΩ
DIGITAL FILTER PERFORMANCE
Filter Characteristics
Passband ±0.002dB 0.454f
Stopband 0.546f
Passband Ripple ±0.002 dB
Stopband Attenuation Stop Band = 0.546f
Delay Time 30/f
De-emphasis Error ±0.1 dB
INTERNAL ANALOG FILTER
–3dB Bandwidth 100 kHz
Passband Response f = 20kHz –0.16 dB
POWER SUPPLY REQUIREMENTS
Voltage Range V
Supply Current: I
CC +IDD
Power Dissipation f
TEMPERATURE RANGE
Operation –25 +85 °C
Storage –55 +100 °C
NOTES: (1) Refer section of system clock. (2) External buffer is recommended. (3) Dynamic performance specs are tested with 20kHz low pass filter and THD+N
specs are tested with 30kHz LPF, 400Hz HPF, Average Mode.
= +5V, fS = 44.1kHz, and 24-bit input data, SYSCLK = 384fS, unless otherwise noted.
DD
PCM1728
256/384/512/768f
IH
IL
OL
I
= 2mA 4.5 V
OH
I
= 4mA 0.5 V
OL
, 10pF 4 ns
DD
2.0 V
S
0.8 V
(24-Bit Data)
= 0dB fS = 44.1kHz –97 –90 dB
O
= –60dB fS = 44.1kHz –42 dB
O
fS = 96kHz –94 dB
=44.1kHz EIAJ A-weighted 98 106 dB
S
f
= 96kHz A-weighted 103 dB
S
=44.1kHz EIAJ A-weighted 98 106 dB
S
f
= 96kHz A-weighted 103 dB
S
f
= 96kHz 101 dB
S
(16-Bit Data)
= 0dB fS = 44.1kHz –94 dB
O
f
= 96kHz –92 dB
S
= 44.1kHz EIAJ A-weighted 98 dB
S
fS = 96kHz A-weighted 97 dB
= 0.5VCC at Bipolar Zero ±30 ±60 mV
O
CC
CC
–3dB 0.490f
S
Stop Band = 0.567f
DD, VCC
fS = 44.1kHz 32 45 mA
f
= 96kHz 45 mA
S
= 44.1kHz 160 225 mW
S
f
= 96kHz 225 mW
S
S
S
–75 dB
–82 dB
S
4.5 5 5.5 VDC
S
S
Vp-p
V
sec
®
PCM1728
2
LRCIN
DIN
BCKIN
CLKO
XTI
XTO
DGND
V
VCC2R
AGND2R
EXTR
NC
V
OUT
AGND1
1
2
3
4
5
6
7
8
DD
9
10
11
12
13
R
14
PCM1728E
28
27
26
25
24
23
22
21
20
19
18
17
16
15
2
I
S
DM1
DM0
MUTE
IW1
IW0
RST
ZERO
V
2L
CC
AGND2L
EXTL
NC
V
L
OUT
V
1
CC
PACKAGE INFORMATION
PRODUCT PACKAGE NUMBER
PACKAGE DRAWING
PCM1728E 28-Pin SSOP 324
NOTE: (1) For detailed drawing and dimension table, please see end of data
sheet, or Appendix C of Burr-Brown IC Data Book.
(1)
ABSOLUTE MAXIMUM RATINGS
Power Supply Voltage ...................................................................... +6.5V
+V
to +VDD Difference ................................................................... ±0.1V
CC
Input Logic Voltage .................................................. –0.3V to (V
Input Current (except power supply)............................................... ±10mA
Power Dissipation .......................................................................... 400mW
Operating Temperature Range ......................................... –25°C to +85°C
Storage Temperature...................................................... –55°C to +125°C
Lead Temperature (soldering, 5s)................................................. +260°C
+ 0.3V)
DD
PIN ASSIGNMENTSPIN CONFIGURATION
PIN NAME I/O DESCRIPTION
1 LRCIN IN Left and Right Clock Input. This clock is equal to
2 DIN IN Serial Audio Data Input
3 BCKIN IN Bit Clock Input for Serial Audio Data.
4 CLKO OUT Buffered Output of Oscillator. Equivalent to
5 XTI IN Oscillator Input (External Clock Input)
6 XTO OUT Oscillator Output
7 DGND — Digital Ground
8V
9V
10 AGND2R — Analog Ground
11 EXTR OUT Rch, Common Pin of Analog Output Amp
12 NC — No Connection
13 V
14 AGND1 — Analog Ground
15 V
16 V
17 NC — No Connection
18 EXTL OUT Lch, Common Pin of Analog Output Amp
19 AGND2L — Analog Ground
20 V
21 ZERO OUT Zero Data Flag
22 RST IN Reset. When this pin is LOW, the DF and
23 IW0 IN Input Format Selection
24 IW1 IN Input Format Selection
25 MUTE IN Mute Control
26 DM0 IN De-emphasis Selection 1
27 DM1 IN De-emphasis Selection 2
28 I2S IN Input Format Selection
NOTES: (1) Pins 1, 2, 3; Schmitt Trigger input. (2) Pins 22, 25, 26, 27, 28;
Schmitt Trigger input with pull-up resister. (3) Pins 23, 24; Schmitt Trigger
input with pull-down resister.
DD
2R — Analog Power +5V
CC
R OUT Rch, Analog Voltage Output of Audio Signal
OUT
1 — Analog Power +5V
CC
L OUT Lch, Analog Voltage Output of Audio Signal
OUT
2L — Analog Power +5V
CC
the sampling rate - fS.
System Clock.
— Digital Power +5V
modulators are held in reset.
(1)
(1)
(1)
(2)
(3)
(3)
(2)
(2)
(2)
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.
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 PCM1728
®
TYPICAL PERFORMANCE CURVES
All specifications at +25°C, +VCC = +V
= +5V, fS = 44.1kHz, and 24-bit input data, SYSCLK = 384fS, unless otherwise noted.
DD
88
91
94
97
THD+N at F/S (dB)
100
103
32 44.1 48 96
DYNAMIC RANGE vs SAMPLING FREQUENCY
110
108
THD+N vs SAMPLING FREQUENCY
= VDD = 5V, 24-Bit)
(V
CC
256fs
384fs
Sampling Frequency f
(V
= VDD = 5V, 24-Bit)
CC
(kHz)
S
10
1
0.1
THD+N (%)
0.010
0.001
110
108
THD+N vs LEVEL
= 44.1kHz)
(f
S
16-Bit
24-Bit
–50–60 –40 –30 –20 –10 0
Amplitude (dB)
SNR vs SAMPLING FREQUENCY
(V
= VDD = 5V, 24-Bit)
CC
–20
–30
–40
–50
–60
–70
–80
–90
–100
THD+N (dB)
106
256/384f
104
S
102
Dynamic Range (A-weighted) (dB)
100
32 44.1 48 96
Sampling Frequency f
(kHz)
S
–60dB OUTPUT SPECTRUM
–60
(f = 1kHz, f
= 44.1kHz, 16-Bit Data)
S
–70
–80
–90
–100
–110
–120
Amplitude (dB)
–130
–140
–150
202468101214161820
Frequency (Hz)
106
256/384f
104
SNR (A-weighted) (dB)
102
100
32 44.1 48 96
Sampling Frequency f
S
(kHz)
S
–60dB OUTPUT SPECTRUM
–60
(f = 1kHz, f
= 44.1kHz, 24-Bit Data)
S
–70
–80
–90
–100
–110
–120
Amplitude (dB)
–130
–140
–150
202468101214161820
Frequency (Hz)
®
PCM1728
4