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DF1704
DF1704
Integrated circuits
Special Function, AF
DATASHEET 1/2000
Integrated circuits
Special Function, AF
DATASHEET 1/2000
DF1704
Soundplus™ Stereo, 24-bit, 96kHz 8
×
Oversam-
over-
sampling digital interpolation filter designed for high-
end consumer and professional audio applications.
The DF1704 supports 24-bit, 96kHz operation and
features user-programmable functions, including
selectable filter response, de-emphasis, attenuation,
and input/output data formats.
The DF1704 is the ideal companion for Burr-Brown’s
PCM1704 24-bit audio digital-to-analog converter.
This combination allows for construction of very high
performance audio systems and components.
×
Hardware mode controls
PIN NAME
pling Digital Interpolation Filter
Digital-to-Analog Converter
PIN NUMBER
DESCRIPTION
RESV
13
Reserved, Not Used
Manufacturer
LRIP
12
LRCIN Polarity
LRIP = H: LRCIN= H = Left Channel, LRCIN= L = Right Channel
LRIP = L: LRCIN= L = Left Channel, LRCIN = H = Right Channel
CKO
11
CLKO Output Frequency
CKO = H: CLKO Frequency = XTI/2
CKO = L: CLKO Frequency = XTI
Burr-Brown, P.O. Box 11400, Tucson, AZ 85734,
U.S.A. Tel. (520) 746-1111, fax (520) 889-1510.
Internet: http://www.burr-brown.com/
MUTE
15
Soft Mute Control: H = Mute Off, L = Mute On
I 2 S
IW0
IW1
3
4
5
Input Data Format Controls
Features
➧ COMPANION DIGITAL FILTER FOR THE PCM1704
24-BIT AUDIO DAC
I 2 S IW1 IW0 INPUT FORMAT
L L L 16-Bit, Standard, MSB-First, Right-Justified
L L H 20-Bit, Standard, MSB-First, Right-Justified
L H L 24-Bit, Standard, MSB-First, Right-Justified
L H H 24-Bit, MSB-First, Left-Justified
H L L 16-Bit, I 2 S
H L H 24-Bit, I 2 S
HIGH PERFORMANCE FILTER:
Stopband Attenuation: –115dB
Passband Ripple: ±0.00005dB
➧ 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 96kHz
➧ SYSTEM CLOCK: 256f S , 384f S , 512f S , 768f S
➧
SRO
27
Digital Filter Roll-Off: H = Slow, L = Sharp
OW0
OW1
19
20
Output Data Word Length Controls
OW1 OW0 OUTPUT FORMAT
L L 16-Bit, MSB-First
L H 18-Bit, MSB-First
H L 20-Bit, MSB-First
H H 24-Bit, MSB-First
ON-CHIP CRYSTAL OSCILLATOR
Pin configuration.
➧
PROGRAMMABLE FUNCTIONS:
Hardware or Software Control Modes
Sharp or Slow Roll-Off Filter Response
Soft Mute
Digital De-Emphasis
Independent Left/Right Digital Attenuation
SF0
SF1
17
18
Sample Rate Selection for the Digital De-Emphasis Control
SF1 SF0 SAMPLING RATE
L L 44.1kHz
L H Reserved, Not Used
H L 48kHz
H H 32kHz
+5V SINGLE-SUPPLY OPERATION
➧ SMALL 28-LEAD SSOP PACKAGE
Application Exampl e
Audio DAC2000, Elektor Electronics November 1999
– January 2000.
DEM
16
Digital De-Emphasis: H = On, L = Off
DF1704 bock diagram.
Description
The DF1704 is a high performance, stereo, 8
➧
➧
138910701.002.png 138910701.003.png 138910701.004.png
DF1704
DF1704
Integrated circuits
Special Function, AF
DATASHEET 1/2000
Integrated circuits
Special Function, AF
DATASHEET 1/2000
Programmable Functions
The DF1704 includes a number of programmable
features, with most being accessible from either
Hardware or Software mode. The table below sum-
marizes the user programmable functions for both
modes of operation.
Pin Assignments
PIN NAME I/O DESCRIPTION
1 DIN IN Serial Audio Data Input (3)
2 BCKIN IN Bit Clock Input for Serial Audio Data (3)
3 I 2 S IN Input Audio Data Format Selection (2, 4)
4 IW0 IN Input Audio Data Word Selection (2, 4)
5 IW1 IN Input Audio Data Word Selection (2, 4)
6 XTI IN Oscillator Input /External Clock Input
7 XTO OUT Oscillator Output
8 VSS — Digital Ground
9 CLKO OUT Buffered System Clock Output
10 MODE IN Mode Control Selection (H: Software, L: Hardware) (1)
11 MD/CKO IN Control Data Input/Clock Output Frequency Select (1, 5)
12 MC/LRIP IN Control Data Clock/Polarity of LRCK Select (1, 5)
13 ML/RESV IN Control Data Latch/Reserved (1, 5)
14 RST IN Reset. When this pin is LOW, the digital filter is held in reset. (1)
15 MUTE IN Mute Control (1, 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 and Format Select (2, 4)
20 OW1 IN Output Audio Data Word and Format Select (2, 4)
21 NC — No Connection
22 V DD — Digital Power, +5V
23 DOR OUT Rch, Serial Audio Data Output
24 DOL OUT Lch, Serial Audio Data Output
25 WCKO OUT Word Clock for Serial Audio Data Output
26 BCKO OUT Bit Clock for Serial Audio Data Output
27 SRO IN Filter Response Select (2, 4)
28 LRCIN IN L/R Clock Input (f S) for Serial Audio Data (3)
NOTES: (1) Pins 10-15; Schmitt-Trigger input with pull-up resistor. (2) Pins 3-5, 16-20, 27;
Schmitt-Trigger input with pull-down resister. (3) Pins 1, 2, 28; Schmitt-Trigger input.
(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 corresponding to MODE (pin 10),
(HIGH/LOW).
FUNCTION
SOFTWARE
(MODE = H)
HARDWARE
(MODE = L)
RESET DEFAULT
(Software Mode)
Input Data Format Selection
O
O
Standard Format
Input Word Length Selection
O
O
16 Bits
Output Word Length
Selection
O
O
16 Bits
LRCIN Polarity Selection
O
O
Left/Right = High/Low
Digital De-Emphasis
O
O
OFF
Soft Mute
O
O
OFF
Digital Attenuation
O
X
0dB, Independent L/R
Sample Rate for
De-Emphasis Function
O
O
44.1 kHz
Filter Roll-Off Selection
O
O
Sharp Roll-Off Selected
CLKO Output Frequency
Selection
O
O
Same As XTI Input
Legend: O = User Programmable, X = Not Available.
Hardware Mode Controls
With MODE = L, the DF1704 may be configured by
utilizing several user-programmable pins. The follow-
ing is a brief summary of the pin functions. The table
below provides more details on setting the hardware
mode controls.
Pins SF0 and SF1 are used to select the sample rate
for the de-emphasis function.
The SRO pin is used to select the digital filter
response, either sharp or slow roll-off.
The MUTE pin is used to enable or disable the soft
mute function.
Pins I 2 S, IW0, and IW1 are used to select the audio
data input format and word length.
Pins OW0 and OW1 are used to select the output
data word length.
The CKO pin is used to select the clock frequency
seen at the CLKO pin, either XTI or XTI
÷
2.
The DEM pin is used to enable and disable the digital
de-emphasis function. De-emphasis is only available
for 32kHz, 44.1kHz, and 48kHz sample rates.
The LRIP pin is used to select the polarity used for
the audio input left/right clock, LRCIN.
Finally, the RESV pin is not used by the current
DF1704 design, but is reserved for future use.
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