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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

Disabled

44.1 kHz

32 kHz

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

Right Justify

DSP

Left Justify

Packed Mode 1 (256)

Packed Mode 2 (128)

AUX Mode

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

24 Bits

20 Bits

16 Bits

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

Normal Operation

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

Table VII. Interpolator Mode Settings

Bit 1

Bit 0

Interpolator Mode

× (48 kHz)

× (192 kHz)

× (96 kHz)

Reserved

Table II. DAC Control I

Function

Data Word

Power-Down

Interpolator

Address

Reserved

De-Emphasis

Serial Mode

Width

RESET

Mode

15–12

9–8

7–5

4–3

1–0

0000

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

100 = Pack Mode 1 (256)

101 = Pack Mode 2 (128)

110 = AUX Mode

111 = Reserved

*Must be programmed to zero.

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