PCM1738
PC
M
173
8
www.ti.com
24-Bit, 192kHz Sampling,
Advanced Segment, Audio-Stereo
DIGITAL-TO-ANALOG CONVERTER
FEATURES
24-BIT RESOLUTION
ANALOG PERFORMANCE (V
CC
= +5V):
Dynamic Range: 117dB typ
SNR: 117dB typ
THD+N: 0.0004% typ
Full-Scale Output: 2.2Vrms (at post amp)
DIFFERENTIAL CURRENT OUTPUT: 2.48mA
SAMPLING FREQUENCY: 10kHz to 200kHz
SYSTEM CLOCK: 128, 192, 256, 384, 512,
or 768f
S
with Auto Detect
ACCEPTS 16-, 20-, AND 24-BIT AUDIO DATA
DATA FORMATS: Standard, I
2
S, and Left-
Justified
8x OVERSAMPLING DIGITAL FILTER:
Stopband Attenuation: –82dB
Passband Ripple: 0.002dB
OPTIONAL INTERFACE TO EXTERNAL
DIGITAL FILTER AVAILABLE
OPTIONAL INTERFACE TO DSD DE-
CODER FOR SACD PLAYBACK
USER-PROGRAMMABLE MODE CONTROLS:
Digital Attenuation: 0dB to –120dB, 0.5dB/Step
Digital De-Emphasis
Digital Filter Roll-Off: Sharp or Slow
Soft Mute
Zero Detect Mute
Zero Flags for Each Output
DUAL-SUPPLY OPERATION:
+5V Analog, +3.3V Digital
5V TOLERANT DIGITAL INPUTS
SMALL SSOP-28 PACKAGE
APPLICATIONS
AV RECEIVERS
DVD MOVIE PLAYERS
SACD PLAYERS
HDTV RECEIVERS
CAR AUDIO SYSTEMS
DIGITAL MULTI-TRACK RECORDERS
OTHER MULTICHANNEL AUDIO SYSTEMS
DESCRIPTION
The PCM1738 is a CMOS, monolithic, Integrated Cir-
cuit (IC) that includes stereo Digital-to-Analog Convert-
ers (DACs) and support circuitry in a small SSOP-28
package. The data converters utilize a newly developed
advanced segment DAC architecture to achieve excel-
lent dynamic performance and improved tolerance to
clock jitter. The PCM1738 provides balanced current
outputs, allowing the user to optimize analog perfor-
mance externally, and accepts industry standard audio
data formats with 16- to 24-bit data, providing easy
interfacing to audio DSP and decoder chips. Sampling
rates up to 200kHz are supported. The PCM1738 also
has two optional modes of operation: an external digital-
filter mode (for use with the DF1704, DF1706, and
PMD200), and a DSD decoder interface for SACD
playback applications. A full set of user-programmable
functions are accessible through a 4-wire serial control
port that supports register write and read functions.
Copyright © 2000, Texas Instruments Incorporated
SBAS174B
Printed in U.S.A. February, 2002
SPECIFICATIONS
All specifications at T
A
= +25 C, V
DD
= +3.3V, V
CC
= +5V, SCKI = 256f
S
(f
S
= 44.1kHz), and 24-bit input data, unless otherwise noted.
PCM1738E
PARAMETER
RESOLUTION
DATA FORMAT
Audio Data Interface Formats
Audio Data Bit Length
Audio Data Format
Sampling Frequency (f
S
)
System Clock Frequency
DIGITAL INPUT/OUTPUT
Logic Family
Input Logic Level
V
IH
V
IL
Input Logic Current
I
IH
I
IL
Output Logic Level
V
OH
V
OL
High Impedance Output Logic Current
(1)
I
OHZ
I
OLZ
DYNAMIC PERFORMANCE
(2)
THD+N at V
OUT
= 0dB
CONDITIONS
MIN
TYP
24
Standard, I
2
S, Left-Justified
16-, 20-, 24-Bits Selectable
MSB-First, Binary Two’s Complement
10
200
128, 192, 256, 384, 512, 768f
S
TTL-Compatible
2.0
0.8
V
IN
= V
DD
V
IN
= 0V
I
OH
= –2mA
I
OL
= +2mA
V
OUT
= V
DD
V
OUT
= V
DD
f
S
= 44.1kHz
f
S
= 96kHz
f
S
= 192kHz
EIAJ, A-Weighted, f
S
= 44.1kHz
A-Weighted, f
S
= 96kHz
A-Weighted, f
S
= 192kHz
EIAJ, A-Weighted, f
S
= 44.1kHz
A-Weighted, f
S
= 96kHz
A-Weighted, f
S
= 192kHz
f
S
= 44.1kHz
f
S
= 96kHz
f
S
= 192kHz
V
OUT
= –110dB
0.0004
0.0006
0.0012
117
117
117
117
117
117
115
113
111
1.0
2.45
100
2.0
0.5
0.5
0.0004
117
117
2.48
2.48
0
2.4
1.0
5
5
0.0008
10
–10
VDC
VDC
A
A
VDC
VDC
A
A
%
%
%
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
V
A
% of FSR
% of FSR
% of FSR
%
dB
dB
mAp-p
mAp-p
mAp-p
MAX
UNITS
Bits
kHz
Dynamic Range
114
Signal-to-Noise Ratio
114
Channel Separation
110
Level Linearity Error
DC ACCURACY
V
COM
2 Voltage
V
COM
2 Output Current
Gain Error
Gain Mismatch, Channel-to-Channel
Bipolar Zero Error
DSD MODE DYNAMIC
THD+N at Full Scale
Dynamic Range
Signal-to-Noise Ratio
PERFORMANCE
(1)
Delta V
COM
2 < 5%
at Bipolar Zero
44.1kHz, 64f
S
2.48mAp-p
–60dB, EIAJ, A-Weighted
EIAJ, A-Weighted
Full Scale (0dB)
100% OUTPUT
Bipolar Zero Input
ANALOG OUTPUT
Output Current
DSD Mode Output Current
Center Current
DIGITAL-FILTER PERFORMANCE
Filter Characteristics 1, Sharp Roll-Off
Passband
Passband
Stopband
Passband Ripple
Stopband Attenuation
Stopband Attenuation
Filter Characteristics 2, Slow Roll-Off
Passband
Passband
Stopband
Passband Ripple
Stopband Attenuation
Delay Time
De-Emphasis Error
0.002dB
–3dB
0.546f
S
0.454f
S
0.487f
S
0.002
Stopband = 0.546f
S
Stopband = 0.567f
S
0.04dB
–3dB
–75
–82
0.274f
S
0.454f
S
0.732f
S
0.002
Hz
Hz
Hz
dB
dB
dB
Hz
Hz
Hz
dB
dB
sec
dB
Stopband = 0.732f
S
–82
29/f
S
0.1
2
PCM1738
SBAS174B
SPECIFICATIONS
(Cont.)
All specifications at T
A
= +25 C, V
DD
= +3.3V, V
CC
= +5V, SCKI = 256f
S
(f
S
= 44.1kHz), and 24-bit input data, unless otherwise noted.
PCM1738E
PARAMETER
POWER SUPPLY REQUIREMENTS
Voltage Range, V
DD
V
CC
Supply Current, I
DD(4)
CONDITIONS
MIN
+3.0
+4.75
V
DD
= 3.3V, f
S
= 44.1kHz
V
DD
= 3.3V, f
S
= 96kHz
V
DD
= 3.3V, f
S
= 192kHz
V
CC
= 5.0V, f
S
= 44.1kHz
V
CC
= 5.0V, f
S
= 96kHz
V
CC
= 5.0V, f
S
= 192kHz
V
DD
= 3.3V, V
CC
= 5.0V, f
S
= 44.1kHz
V
DD
= 3.3V, V
CC
= 5.0V, f
S
= 96kHz
V
DD
= 3.3V, V
CC
= 5.0V, f
S
= 192kHz
–25
JA
TYP
+3.3
+5.0
7.0
15.0
30.0
33.0
34.5
36.5
188
222
282
MAX
+3.6
+5.25
9.8
UNITS
VDC
VDC
mA
mA
mA
mA
mA
mA
mW
mW
mW
C
C/W
I
CC
46.2
Power Dissipation
263
TEMPERATURE RANGE
Operation Temperature
Thermal Resistance
+85
115
SSOP-28
NOTES: (1) Pin 11 (MDO). (2) Analog performance specifications are measured by an Audio Precision System II, using an averaging mode. At 44.1kHz
operation, bandwidth measurement is limited with 20kHz. At 96kHz and 192kHz, bandwidth measurement is limited with 40kHz. (3) Theoretical performance
in DSD modulation index of 100%. It's performance is equivalent to the PCM mode. (4) SCKO is disabled. Input is Bipolar Zero Data.
ABSOLUTE MAXIMUM RATINGS
Power Supply Voltage, V
CC
1, V
CC
2, and V
CC
3 .............................................. +6.5V
V
DD
............................................................................. +4.0V
Supply Voltage Differences Among V
CC
1, V
CC
2, and V
CC
3 .......................... 0.1V
Ground Voltage Differences Among AGND1, AGND2,
and AGND3 ................................................................................................. 0.1V
Digital Input Voltage, LRCK, DATA, BCK, SCKI, MDI,
MC, and MUTE ............................................................................... –0.3V to 6.5V
Digital Input Voltage, ZEROL, ZEROR, SCKO,
and MDO ........................................................................... –3.0V to (V
DD
+ 0.3V)
Analog Input Voltage, I
OUT
R–, I
OUT
R+, V
COM
1,
V
COM
2, V
COM
3, I
REF
, I
OUT
L+, and I
OUT
L– ................ –0.3V to (V
CC
, V
CC
2 + 0.3V)
Input Current (except power supply) ............................................................ 10mA
Ambient Temperature Under Bias ................................................ –40 C to +125 C
Storage Temperature .................................................................... –55 C to +150 C
Junction Temperature .................................................................................. +150 C
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.
PACKAGE/ORDERING INFORMATION
PACKAGE
DRAWING
NUMBER
324
SPECIFIED
TEMPERATURE
RANGE
–25 C to +85 C
PACKAGE
MARKING
PCM1738E
ORDERING
NUMBER
(1)
PCM1738E
PCM1738E/2K
TRANSPORT
MEDIA
Rails
Tape and Reel
PRODUCT
PCM1738E
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 “PCM1738E/2K” will yield a single 2000-piece Tape and Reel.
PCM1738
SBAS174B
3
BLOCK DIAGRAM
LRCK
Input
DATA
I/F
BCK
8x
Oversampling
Digital
Filter
and
Function
Control
Advanced
Segment
DAC
Modulator
V
COM
2
Bias
and V
REF
I
REF
V
COM
1
V
COM
3
IV and Filter
Current
Segment
DAC
I
OUT
R–
I
OUT
R+
IV and Filter
Current
Segment
DAC
I
OUT
L+
I
OUT
L–
RST
MUTE
CS
MC
MDI
I/F
MDO
Function
Control
System Clock
System Clock
Manager
SCKI
ZERO Detect
Power Supply
ZEROR
AGND1
V
CC
1
V
CC
2
ZEROL
SCKO
V
CC
3
V
DD
PIN CONFIGURATION
TOP VIEW
SSOP
PIN ASSIGNMENTS
PIN
1
2
3
4
NAME
RST
ZEROL
ZEROR
LRCK
TYPE
IN
OUT
OUT
IN
FUNCTION
Reset
(1)
Zero Flag for L-Channel.
Zero Flag for R-Channel.
Left/Right clock (f
S
) input for normal operation.
(1)
WDCK clock input in external DF mode. Con-
nected to GND in DSD mode.
Serial Audio data input for normal operation.
(1)
L-channel audio data input for external DF and
DSD modes.
Bit Clock. Input. Connected to GND for DSD mode.
(1)
System Clock Input for normal operation.
(1)
BCK (64f
S
) clock input for DSD mode.
Digital Ground
Digital Supply, +3.3V
System Clock Output
Serial data output for function control register.
(2)
Serial data input for function control register.
(1)
Shift Clock for function control register.
(1)
Mode Control chip select and latch signal.
(1)
Analog output mute control for normal operation.
(1)
R-channel audio data input for external DF and
DSD modes.
R-Channel Analog Current Output –
R-Channel Analog Current Output +
Analog Ground
Internal Bias Decoupling Pin
Common Voltage for I/V
Output current reference bias pin. Connect 16k
resistor to GND.
Internal Bias Decoupling Pin
Analog Supply, +5.0V
Analog Supply, +5.0V
L-Channel Analog Current Output +
L-Channel Analog Current Output –
Analog Ground
Analog Power Supply, +5.0V
RST
ZEROL
ZEROR
LRCK
DATA
BCK
SCKI
DGND
V
DD
1
2
3
4
5
6
7
PCM1738
8
9
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V
CC
3
AGND2
I
OUT
L–
I
OUT
L+
V
CC
2
V
CC
1
V
COM
3
I
REF
V
COM
2
V
COM
1
AGND1
I
OUT
R+
I
OUT
R–
MUTE
5
DATA
AGND2
DGND
IN
6
7
8
9
10
11
12
13
14
15
BCK
SCKI
DGND
V
DD
SCKO
MDO
MDI
MC
CS
MUTE
IN
IN
–
–
OUT
OUT
IN
IN
IN
IN
SCKO 10
MDO 11
MDI 12
MC 13
CS 14
16
17
18
19
20
21
22
23
24
25
26
27
28
I
OUT
R–
I
OUT
R+
AGND1
V
COM
1
V
COM
2
I
REF
V
COM
3
V
CC
1
V
CC
2
I
OUT
L+
I
OUT
L–
AGND2
V
CC
3
OUT
OUT
–
–
–
–
–
–
–
OUT
OUT
–
–
NOTES: (1) Schmitt-trigger input, 5V tolerant. (2) Tristate output.
4
PCM1738
SBAS174B
TYPICAL PERFORMANCE CURVES
All specifications at T
A
= +25 C, V
DD
= +3.3V, V
CC
= +5V, SCKI = 256f
S
(f
S
= 44.1kHz), and 24-bit input data, unless otherwise noted.
DIGITAL FILTER
Digital Filter (De-Emphasis Off, f
S
= 44.1kHz)
FREQUENCY RESPONSE (Sharp Roll-Off)
0
–20
0.002
–40
Amplitude (dB)
Amplitude (dB)
PASSBAND RIPPLE (Sharp Roll-Off)
0.003
–60
–80
–100
–120
–140
–160
0
1
2
Frequency (x f
S
)
3
4
0.001
0
–0.001
–0.002
–0.003
0
0.1
0.2
0.3
0.4
0.5
Frequency (x f
S
)
FREQUENCY RESPONSE (Slow Roll-Off)
0
–20
–40
Amplitude (dB)
Amplitude (dB)
TRANSITION CHARACTERISTICS (Slow Roll-Off)
0
–2
–4
–6
–8
–10
–12
–14
–16
–60
–80
–100
–120
–140
0
1
2
Frequency (x f
S
)
3
4
–18
–20
0
0.1
0.2
0.3
0.4
0.5
0.6
Frequency (x f
S
)
De-Emphasis Error
DE-EMPHASIS (f
S
= 32kHz)
0.0
–1.0
–2.0
–3.0
0.5
0.4
0.3
0.2
DE-EMPHASIS ERROR (f
S
= 32kHz)
Level (dB)
–5.0
–6.0
–7.0
–8.0
–9.0
–10.0
0
2
4
6
8
10
12
14
Frequency (kHz)
Error (dB)
–4.0
0.1
0.0
–0.1
–0.2
–0.3
–0.4
–0.5
0
2
4
6
8
10
12
14
Frequency (kHz)
PCM1738
SBAS174B
5
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