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DF1706 Datasheet(PDF) 10 Page - Texas Instruments

Part # DF1706
Description  Stereo, 24-Bit, 192kHz 8x Oversampling Digital Interpolation Filter
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

DF1706 Datasheet(HTML) 10 Page - Texas Instruments

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DF1706
10
SBAS182
PIN
PIN
NAME
NUMBER
DESCRIPTION
RSV
13
Reserved, Not Used
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
MUTE
15
Soft Mute Control: H = Mute Off, L = Mute On
I2S
3
Input Data Format Controls
IW0
4
IW1
5
I2S
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, I2S
H
L
H
24-Bit, I2S
SRO
27
Digital Filter Roll-Off: H = Slow, L = Sharp
OW0
19
Output Data Word Length Controls
OW1
20
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
SF0
17
Sample Rate Selection for the Digital De-Emphasis Control
SF1
18
SF1
SF0
SAMPLING RATE
L
L
44.1kHz
L
H
Reserved, Not Used
H
L
48kHz
H
H
32kHz
DEM
16
Digital De-Emphasis: H = On, L = Off
x4
21
Oversampling Rate Control: H = 4fS, L = 8fS
TABLE IV. Hardware Mode Controls.
RESET
SOFTWARE
HARDWARE
DEFAULT
FUNCTION
(MODE = H)
(MODE = L)
(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
Over Sample Ratio Control
O
O
8x
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.
TABLE III. User-Programmable Functions for Software and
Hardware Mode.
Programmable Functions
The DF1706 includes a number of programmable features,
with most being accessible from either Hardware or Soft-
ware mode. Table III summarizes the user-programmable
functions for both modes of operation.
Hardware Mode Controls
With MODE = L, the DF1706 may be configured by
utilizing several user-programmable pins. The following is a
brief summary of the pin functions. Table IV provides more
details on setting the hardware mode controls.
Pins I2S, 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 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.
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. Generally, sharp roll-off filter
is used.
The MUTE pin is used to enable or disable the soft mute
function.
The CKO pin is used to select the clock frequency seen at
the CLKO pin, either XTI or XTI
÷ 2.
The LRIP pin is used to select the polarity used for the audio
input left/right clock, LRCIN.
The x4 pin is used to control the over sampling ratio of the
internal digital filter, either a 8x or 4x. For instance, when fs
is 192kHz or 176.4kHz, the over sampling ratio should be 4x.
Finally, the RESV pin is not used by the current DF1706
design, but is reserved for future use.
Software Mode Controls
With MODE = H, the DF1706 may be configured by
programming four internal registers in software mode. ML
(pin 13), MC (pin 12), and MD (pin 11) make up the 3-wire
software control port, and may be controlled using DSP or
microcontroller general purpose I/O pins, or a serial port.
Table V provides an overview of the internal registers,
labeled MODE0 through MODE3 (see Table V).
See Figures 8 through 10 for more details regarding the
control port data format and timing requirements. The data
format for the control port is 16-bit, MSB-first, with Bit B15
being the MSB.
Register Addressing
A[1:0], bits B10 and B9 of the 16-bit control data word, are
used to indicate the register address to be written to by the
current control port write cycle. See Table VI for how to
address the internal registers using bits A[1:0] of registers
MODE0 through MODE3.


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