Stereo, 24-Bit, 192kHz
8x Oversampling Digital Interpolation Filter
49%
FPO
DF1706
DESCRIPTION
The DF1706 is a high performance, stereo, 8X
oversampling digital interpolation filter designed for
high-end consumer and professional audio applica-
tions. The DF1706 supports 24-bit, 192kHz operation
and features user-programmable functions, including
FEATURES
q
COMPANION DIGITAL FILTER FOR THE
PCM1704 24-BIT AUDIO DAC
q
HIGH PERFORMANCE FILTER:
Stopband Attenuation: 115dB
Passband Ripple:
0.00005dB
q
AUDIO INTERFACE:
Input Data Formats: Standard, Left-
Justified, and I
2
S
Input Word Length: 16, 20, or 24 Bits
Output Word Length: 16, 18, 20, or 24 Bits
Sampling Frequency: 32kHz to 192kHz
Serial
Input
I/F
Mode
Control
I/F
8X Oversampling
Digital Filter with
Function
Controller
Crystal/OSC
XTI
SCK
XTO
CLKO
(SF0) (SF1) (SRO)
V
DD
DGND
Output I/F
BCKO
(I
2
S)
(IW1)
(IW0)
(OW1)
(OW0)
WCKO
DOL
DOR
MC/LRIP
MD/CKO
LRCIN
DIN
BCKIN
x4
MODE
ML/RESV
(MUTE)
RST
(DEM)
Power Supply
Copyright 2001, Texas Instruments Incorporated
SBAS182
Printed in U.S.A. January, 2001
www.ti.com
DF1706
q
SYSTEM CLOCK: 128f
S
, 192f
S
, 256f
S
,
384f
S
, 512f
S
, 768f
S
q
ON-CHIP CRYSTAL OSCILLATOR
q
PROGRAMMABLE FUNCTIONS:
Hardware or Software Control Modes
Sharp or Slow Roll-Off Filter Response
Soft Mute
Digital De-Emphasis
Independent Left/Right Digital Attenuation
q
+3.3V SINGLE-SUPPLY OPERATION
q
SMALL SSOP-28 PACKAGE
selectable filter response, de-emphasis, attenuation,
and input/output data formats.
The DF1706 is the ideal companion for Texas
Instruments's PCM1704 24-bit audio Digital-to-Ana-
log (D/A) converter. This combination allows for the
construction of very high-performance audio systems
and components.
DF1706
2
SBAS182
SPECIFICATIONS
All specifications at T
A
= +25
C, V
DD
= 3.3V, f
S
= 44.1kHz, system clock = 256f
S
/384f
S
, 16-bit data, unless otherwise noted.
DF1706E
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
RESOLUTION
24
Bits
INPUT DATA FORMAT
Audio Data Interface Format
Standard , Left-Justified , I
2
S
Audio Data Bit Length
16, 20, 24 Selectable
Audio Data Format
MSB First, Binary Two's Complement
Sampling Frequency
f
S
32
192
kHz
System Clock Frequency
(1)
128/192/256/384/512/768
f
S
OUTPUT DATA FORMAT
Audio Data Interface Format
Right-Justified
Audio Data Bit Length
16, 20, 24 Selectable
Audio Data Format
MSB First, Binary Two's Complement
DIGITAL INPUT/OUTPUT
CMOS Compatible
Input Logic Level:
V
IH
0.7V
DD
V
V
IL
0.3V
DD
V
Output Logic Level: V
OH
I
OH
= 2mA
2.4
V
V
OL
I
OL
= 4mA
1.0
V
CLKO AC CHARACTERISTICS
(2)
Rise Time
t
R
20% to 80% V
DD
, 20pF
4
ns
Fall Time
t
F
80% to 20% V
DD
, 20pF
3
ns
Duty Cycle
(2)
20pF Load
50
%
DIGITAL FILTER PERFORMANCE
Filter Characteristics 1 (Sharp Roll-Off)
Passband
0.00005dB
0.454
f
S
3dB
0.493
f
S
Stopband
0.546
f
S
Passband Ripple
0.00005
dB
Stopband Attenuation
Stopband = 0.546f
S
115
dB
Filter Characteristics 2 (Slow Roll-Off)
Passband Ripple
0.0001dB
0.254
f
S
3dB
0.460
f
S
Stopband
0.732
f
S
Passband Ripple
0.0001
dB
Stopband Attenuation
Stopband = 0.748f
S
100
dB
Delay Time
45.125/f
S
sec
De-Emphasis Error
0.004
dB
POWER-SUPPLY REQUIREMENTS
Voltage Range
V
DD
3.0
3.3
3.6
VDC
Supply Current
I
DD
V
DD
= 3.3V
30
45
mA
Power Dissipation
V
DD
= 3.3V
99
149
mW
TEMPERATURE RANGE
Operation
25
+85
C
Storage
55
+125
C
Thermal Resistance,
JA
SSOP-28
100
C
NOTES: (1) Refer to Table I. (2) Crystal resonator used.
DF1706
3
SBAS182
PIN
NAME
I/O
DESCRIPTION
1
D
IN
IN
Serial Audio Data Input
(1)
2
BCKIN
IN
Bit Clock Input for Serial Audio Data
(1)
3
I
2
S
IN
Input Audio Data Format Select
(2, 4)
4
IW0
IN
Input Audio Data Word Select
(2, 4)
5
IW1
IN
Input Audio Data Word Select
(2, 4)
6
XTI
IN
Oscillator Input /External Clock Input
7
XTO
OUT
Oscillator Output
8
DGND
--
Digital Ground
9
CLKO
OUT
Buffered System Clock Output
10
MODE
IN
Mode Control Select (HIGH: Software Mode,
LOW: Hardware Mode)
(3)
11
MD/CKO
IN
Mode Control, Data/Half External Clock Fre-
quency Select
(3, 5)
12
MC/LRIP
IN
Mode Control, Clock/Polarity of LRCIN Select
(3, 5)
13
ML/RESV
IN
Mode Control, Latch Clock/Reserve
(3, 5)
14
RST
IN
Reset, Active LOW. When this pin is LOW the
DF and modulators are held in reset.
(3)
15
MUTE
IN
Mute Control, Active LOW
(4)
16
DEM
IN
De-Emphasis Control
(2, 4)
17
SF0
IN
Sampling Rate Select for De-emphasis
(2, 4)
18
SF1
IN
Sampling Rate Select for De-emphasis
(2, 4)
19
OW0
IN
Output Audio Data Word Select
(2, 4)
20
OW1
IN
Output Audio Data Word Select
(2, 4)
21
x4
IN
Oversampling Ratio Control. When this pin is
set HIGH, the ratio is 4 times.
22
V
DD
--
Digital Power, +3.3V
23
DOR
OUT
R-Channel, Serial Audio Data Output
24
DOL
OUT
L-Channel, Serial Audio Data Output
25
WCKO
OUT
Word Clock Output for Serial Audio Data Output
26
BCKO
OUT
Bit Clock Output for Serial Audio Data Output
27
SRO
IN
Filter Response Select
(2, 4)
28
LRCIN
IN
L/R Clock Input (f
S
)
(1)
NOTES: (1) Pins 1, 2, 28--Schmitt-Trigger input without pull-up and -down
resistor. (2) Pins 3-5, 16-21, 27--Schmitt-Trigger input without pull-up and
-down resistor. (3) Pins 10-15--Schmitt-Trigger input without pull-up and
-down resistor. (4) Pins 3-5, 15-20, 27--these pins are invalid when MODE
(pin 10) is HIGH. (5) Pins 11-13--these pins have different functions corre-
sponding to MODE (pin 10) HIGH/LOW.
PIN ASSIGNMENTS
PIN CONFIGURATION
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.
Supply Voltage .................................................................................. +4.0V
Digital Input Voltage .............................................................. 0.2V to 4.5V
Input Current (any pins except supplies) ........................................
10mA
Operating Temperature Range ......................................... 25
C to +85
C
Ambient Storage Temperature ....................................... 40
C to +125
C
Junction Temperature ................................................................... +150
C
Lead Temperature (soldering, 5s) ................................................. +260
C
Package Temperature (IR reflow, Peak, 10s) ................................ +235
C
ABSOLUTE MAXIMUM RATINGS
D
IN
BCKIN
I
2
S
IW0
IW1
XTI
XTO
DGND
CLKO
MODE
MD/CKO
MC/LRIP
ML/RSV
RST
LRCIN
SRO
BCKO
WCKO
DOL
DOR
V
DD
x4
OW1
OW0
SF1
SF0
DEM
MUTE
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
DF1706E
PACKAGE
SPECIFIED
DRAWING
TEMPERATURE
PACKAGE
ORDERING
TRANSPORT
PRODUCT
PACKAGE
NUMBER
RANGE
MARKING
NUMBER
(1)
MEDIA
DF1706E
SSOP-28
324
25
C to +85
C
DF1706E
DF1706E
Rails
"
"
"
"
"
DF1706E/2K
Tape and Reel
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 "DF1706E/2K" will get a single 2000-piece Tape and Reel.
PACKAGE/ORDERING INFORMATION
Top View
SSOP
DF1706
4
SBAS182
TYPICAL PERFORMANCE CURVES
At T
A
= +25
C, V
DD
=
3.3V, f
S
= 44.1kHz, System Clock = 256f
S
/384f
S
, 16-bit data, unless otherwise noted.
DIGITAL FILTER (DE-EMPHASIS OFF, f
S
= 44.1kHz)
DE-EMPHASIS AND DE-EMPHASIS ERROR
0
4
3
2
1
Frequency (f
S
)
20
0
20
40
60
80
100
120
140
160
180
200
FREQUENCY RESPONSE (Sharp Roll-Off)
Attenuation (dB)
0
0.50
0.45
0.40
0.30 0.35
0.25
0.20
0.15
0.10
0.05
Frequency (f
S
)
0.00010
0.00008
0.00006
0.00004
0.00002
0
0.00002
0.00004
0.00006
0.00008
0.00010
PASSBAND RIPPLE (Sharp Roll-Off)
Attenuation (dB)
0
4
3
2
1
Frequency (f
S
)
0
20
40
60
80
100
120
140
160
180
200
FREQUENCY RESPONSE (Slow Roll Off)
Attenuation (dB)
0
0.1
0.2
0.3
0.4
0.5
0.7
0.6
Frequency (f
S
)
TRANSITION CHARACTERISTIC (Slow Roll Off)
0
5
10
15
Attenuation (dB)
0
14
12
10
8
6
4
2
Frequency (kHz)
0
2
4
6
8
10
DE-EMPHASIS (f
S
= 32kHz)
Level (dB)
0
14
12
8
10
6
4
2
Frequency (kHz)
0.010
0.008
0.006
0.004
0.002
0
0.002
0.004
0.006
0.008
0.010
DE-EMPHASIS ERROR (f
S
= 32kHz)
Error (dB)
DF1706
5
SBAS182
TYPICAL PERFORMANCE CURVES
(Cont.)
At T
A
= +25
C, V
DD
=
3.3V, f
S
= 44.1kHz, System Clock = 256f
S
/384f
S
, 16-bit data, unless otherwise noted.
0
20
18
16
10
14
12
8
6
4
2
Frequency (kHz)
0
2
4
6
8
10
DE-EMPHASIS (f
S
= 44.1kHz)
Level (dB)
0
20
18
16
10
14
12
8
6
4
2
Frequency (kHz)
DE-EMPHASIS ERROR (f
S
= 44.1kHz)
0.010
0.008
0.006
0.004
0.002
0
0.002
0.004
0.006
0.008
0.010
Error (dB)
0
22
20
18
16
10
14
12
8
6
4
2
Frequency (kHz)
0
2
4
6
8
10
DE-EMPHASIS (f
S
= 48kHz)
Level (dB)
0
22
20
18
16
10
14
12
8
6
4
2
Frequency (kHz)
DE-EMPHASIS ERROR (f
S
= 48kHz)
0.010
0.008
0.006
0.004
0.002
0
0.002
0.004
0.006
0.008
0.010
Error (dB)
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