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AD1833 Folha de dados(PDF) 9 Page - Analog Devices

Nome de Peças AD1833
Descrição Electrónicos  Multichannel 24-Bit, 192 kHz, DAC
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Fabricante Electrônico  AD [Analog Devices]
Página de início  http://www.analog.com
Logo AD - Analog Devices

AD1833 Folha de dados(HTML) 9 Page - Analog Devices

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REV. 0
AD1833
–9–
DAC CONTROL REGISTER I
De-Emphasis
The AD1833 has a built-in de-emphasis filter that can be used
to decode CDs that have been encoded with the standard
“Redbook” 50
µs/15 µs emphasis response curve. Three curves
are available; one each for 32 kHz, 44.1 kHz, and 48 kHz sam-
pling rates. The filters may be selected by writing to Control
Bits 9 and 8 in DAC Control Register I, see Table III.
Table III. De-Emphasis Settings
Bit 9
Bit 8
De-Emphasis
0
0
Disabled
0
1
44.1 kHz
1
0
32 kHz
1
1
48 kHz
Data Serial Interface Mode
The AD1833’s serial data interface is designed to accept data in
a wide range of popular formats including I
2S, right justified
(RJ), left justified (LJ) and flexible DSP modes. The L/
RCLK
pin acts as the word clock (or Frame Sync) to indicate sample
interval boundaries. The BCLK defines the serial data rate
while the data is input on the SDIN1-3 pins. The serial mode
settings may be selected by writing to Control Bits 7 through 5
in DAC Control Register I, see Table IV.
Table IV. Data Serial Interface Mode Settings
Bit 7
Bit 6
Bit 5
Serial Mode
00
0
I
2S
0
0
1
Right Justify
0
1
0
DSP
0
1
1
Left Justify
1
0
0
Packed Mode 1 (256)
1
0
1
Packed Mode 2 (128)
1
1
0
AUX Mode
1
1
1
Reserved
DAC Word Width
The AD1833 will accept input data in three separate word-
lengths—16, 20, and 24 bits. The word-length may be selected
by writing to Control Bits 4 and 3 in DAC Control Register I,
see Table V.
Table V. Word Length Settings
Bit 4
Bit 3
Word Length
0
0
24 Bits
0
1
20 Bits
1
0
16 Bits
1
1
Reserved
Power-Down Control
The AD1833 can be powered down by writing to Control Bit 2
in DAC Control Register I, see Table VI. The power-down/
reset bit is not latched when the CLATCH is brought high to
latch the entire word, but only after the following low-to-high
CLATCH transition. Therefore, to put the part in power-down,
or to bring it back up from power-down, the command should
be written twice.
Table VI. Power-Down Control
Bit 2
Power-Down Setting
0
Normal Operation
1
Power-Down Mode
Interpolator Mode
The AD1833’s DAC interpolators can be operated in one of
three modes—8
×, 4×, or 2× corresponding with 48 kHz, 96 kHz,
and 192 kHz modes respectively. The Interpolator Mode may
be selected by writing to Control Bits 1 and 0 in DAC Control
Register I, see Table VII.
Table VII. Interpolator Mode Settings
Bit 1
Bit 0
Interpolator Mode
00
8
× (48 kHz)
01
2
× (192 kHz)
10
4
× (96 kHz)
1
1
Reserved
Table II. DAC Control I
Function
Data Word
Power-Down
Interpolator
Address
Reserved
*
De-Emphasis
Serial Mode
Width
RESET
Mode
15–12
11
10
9–8
7–5
4–3
2
1–0
0000
0
0
00 = None
000 = I2S
00 = 24 Bits
0 = Normal
00 = 8
× (48 kHz)
01 = 44.1 kHz
001 = RJ
01 = 20 Bits
1 = PWRDWN
01 = 2
× (192 kHz)
10 = 32.0 kHz
010 = DSP
10 = 16 Bits
10 = 4
× (96 kHz)
11 = 48.0 kHz
011 = LJ
11 = Reserved
11 = Reserved
100 = Pack Mode 1 (256)
101 = Pack Mode 2 (128)
110 = AUX Mode
111 = Reserved
*Must be programmed to zero.


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