AD1843JS datasheet(47/64 Pages) AD

47 / 64 page

AD1843

REV. 0

–47–

DA2SM

DAC2 Stereo/Mono Mode Select. When in stereo mode, data transmitted to the AD1843 during slot 4 is

used by DAC2 left and data transmitted to the AD1843 during slot 5 is used by DAC2 right. When in

mono mode, data transmitted to the AD1843 during slot 4 is used by both DAC2 left and right, and data

transmitted to the AD1843 during slot 5 is ignored. (Note: slot 0 is assumed to be the first slot.)

0 = Stereo Mode

1 = Mono Mode

DA1SM

DAC1 Stereo/Mono Mode Select. When in stereo mode, data transmitted to the AD1843 during slot 2 is

used by DAC1 left and data transmitted to the AD1843 during slot 3 is used by DAC1 right. When in

mono mode, data transmitted to the AD1843 during slot 2 is used by both DAC1 left and right, and data

transmitted to the AD1843 during slot 3 is ignored. (Note: slot 0 is assumed to be the first slot.)

0 = Stereo Mode

1 = Mono Mode

DA2F1:0

DAC2 (Left and Right Channels) Data Format Select.

00 = 8-bit Unsigned Linear PCM

01 = 16-bit Signed Linear PCM

10 = 8-bit

µ-Law Companded

11 = 8-bit A-Law Companded

DA1F1:0

DAC1 (Left and Right Channels) Data Format Select.

00 = 8-bit Unsigned Linear PCM

01 = 16-bit Signed Linear PCM

10 = 8-bit

µ-Law Companded

11 = 8-bit A-Law Companded

SCF

SCLK Frequency Select. Changes to this bit do not take effect until shortly after the sixth slot (the final slot

owned) is completed. Relevant when the AD1843 is in Master Mode only.

0 = 12.288 MHz

1 = 16.384 MHz

FRS

Frame Size Select. Selects the number of slots per frame. Changes to this bit do not take effect until the

time specified by the FRST bit.

0 = 32 Slots per Frame

1 = 16 Slots per Frame

FRST

Frame Size Change Timing. Selects the point in time when FRS takes effect.

0 = Frame Size Changes Once the Current Frame is Complete

1 = Frame Size Changes Immediately, Beginning with the Current Frame

ADTLK

ADC Transmit Lock Mode Select. When this bit is set to “1,” ADC transmit lock mode is entered. In this

mode, left and right ADC samples are transmitted during a frame only if both left and right samples are

ready to be transmitted. When not in ADC transmit lock mode, left and right samples are transmitted as

they individually become available. Note that even if left and right ADCs are programmed to the same

sample rate, unless the AD1843 is in transmit lock mode, ADC samples will not necessarily be transmitted

paired together in a TDM frame. This bit should be set to “1” only if both ADCs are powered down and

only if both ADCs will be programmed to the sample rate once they are enabled. This bit may be reset to

“0” at any time. While in ADC transmit lock mode, both ADCs must be enabled and disabled simulta-

neously (write to Control Register Address 27 must set ADLEN and ADREN both to “0” or to “1”).

0 = ADC Transmit Lock Mode Disabled

1 = ADC Transmit Lock Mode Enabled

ADRF1:0

ADC Right Channel Data Format Select.

00 = 8-bit Unsigned Linear PCM

01 = 16-bit Signed Linear PCM

10 = 8-bit

µ-Law Companded

11 = 8-bit A-Law Companded

ADLF1:0

ADC Left Channel Data Format Select.

00 = 8-bit Unsigned Linear PCM

01 = 16-bit Signed Linear PCM

10 = 8-bit

µ-Law Companded

11 = 8-bit A-Law Companded

res

Reserved for future expansion. To ensure future compatibility, write “0” to all reserved bits.

Initial default state after reset: 0000 0000 0000 0000 (0000 hex). Cleared to default and cannot be written

to when: the RESET pin is asserted LO; or when the PWRDWN pin is asserted LO.

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