ad1843jst Analog Devices, Inc., ad1843jst Datasheet - Page 42

• Manufacturer Part Number: ad1843jst
• Description: Serial-port 16-bit Soundcomm Codec
• Manufacturer: Analog Devices, Inc.

AD1843
C2C15:0
C2PD
C2P7:0
res
C3REF
Address 20
Address 21
Address 22
Data 15
Data 15
Data 15
C3REF
C2C15
Data 7
Data 7
Data 7
C3M7
C2C7
C2P7
res
Clock Generator 2 Phase Shift Direction. This bit controls the direction of sample clock phase shift.
Reserved for future expansion. To ensure future compatibility, write “0” to all reserved bits.
Clock Generator 3 Reference Select. Selects the fundamental clock reference used by Clock Generator 3 to synthe-
Clock Generator 2 Conversion (Sample) Rate Select. Defines the conversion rate produced by Clock Generator 2 when
not referenced to the SYNC2 pin (Control Register Address 19 Bit 15 [C2REF]). One LSB represents exactly one Hertz,
assuming a 24.576 MHz clock input on the XTALI pin. Usable range is 4 kHz (0x0FA0) to 54 kHz (0xD2F0).
Initial default state after reset: 1011 1011 1000 0000 (BB80 hex), which is 48 kHz, assuming a 24.576 MHz clock in-
put on the XTALI pin. Cleared to default and cannot be written to when: the RESET pin is asserted LO; or when
the PWRDWN pin is asserted LO.
0 = Phase Advance
1 = Phase Retard
Clock Generator 2 Phase Shift Magnitude. These bits control the magnitude of sample clock phase shift. One LSB repre-
sents exactly 0.12 degrees. LSBs are processed and decremented at a rate of 3.072 MHz (assuming a 24.576 MHz clock
input on the XTALI pin). When this register is read, it indicates any phase advance/retard remaining to be processed as of
the beginning of slot 0 if bus master, or when TSI was received if bus slave. This register may be overwritten even if all pre-
viously programmed phase advance/retard has not been processed. When written, the contents of this register (just prior to
the write) are transmitted during slot 1 of the following frame (as with all Control Register writes).
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; when the PWRDWN pin is asserted LO; or when the G2EN bit in Control Register
Address 28 is reset to “0” (clock generator 2 disabled).
size its “Conversion” (sample) and “Bit” clock rates.
0 = Clocks are referenced to the input on pin XTALI (crystal or master clock input).
Sample clock frequency is defined by Control Register Address 23 and Bit C3X8/7.
Sample clock phase may be shifted by Control Register Address 24.
Bit clock frequency is defined by bits C3M7:0 and C3P200.
Bit C3VID is ignored.
Data 14
Data 14
Data 14
C3VID
C2C14
Data 6
Data 6
Data 6
C3M6
C2C6
C2P6
res
Clock Generator 2 Control—Sample Phase Shift
Clock Generator 2 Control—Sample Rate
Clock Generator 3 Control—Mode
C3PLLG
Data 13
Data 13
Data 13
Data 5
C2C13
Data 5
Data 5
C3M5
C2C5
C2P5
res
Data 12
Data 12
Data 12
C3P200
Data 4
C2C12
Data 4
Data 4
C3M4
C2C4
C2P4
res
–42–
Data 11
Data 11
Data 11
C3X8/7
Data 3
C2C11
Data 3
Data 3
C3M3
C2C3
C2P3
res
Data 10
Data 10
Data 10
C3C128
Data 2
C2C10
Data 2
Data 2
C3M2
C2P2
C2C2
res
Data 9
Data 1
Data 9
Data 1
Data 9
Data 1
C3M1
C2P1
C2C9
C2C1
res
res
Data 8
Data 0
Data 8
Data 0
C2PD
Data 8
Data 0
C2P0
C3M0
C2C8
C2C0
res
REV. 0