AD1847
Inter face Configur ation Register (Index Addr ess 9)
IA3:0
D ata 7
D ata 6
D ata 5
D ata 4
D ata 3
D ata 2
D ata 1
D ata 0
1001
res
res
res
res
ACAL
res
res
P EN
PEN
Playback Enable. T his bit will enable the playback of data in the format selected. PEN may be set and reset without
setting the MCE bit.
0
1
Playback Disabled
Playback Enabled
ACAL
Autocalibrate Enable. T his bit determines whether the AD1847 performs an autocalibrate when exiting from the Mode
Change Enable (MCE) state. If the ACAL bit is not set, the previous autocalibration values are used when returning from
the Mode Change Enable (MCE) state and no autocalibration takes place. Autocalibration must be preformed after initial
power-up for proper operation. T his bit is HI after reset.
0
1
No autocalibration
Autocalibration allowed
NOT E: T he ACAL bit can only be changed when the AD1847 is in the Mode Change Enable (MCE) state.
res
Reserved for future expansion. Write zeros (LO) to all reserved bits.
T his register’s initial state after reset is: 0000 1000 (08h).
P in Contr ol Register (Index Addr ess 10)
IA3:0
D ata 7
D ata 6
D ata 5
D ata 4
D ata 3
D ata 2
D ata 1
D ata 0
1010
XC T L1
XC T L0
CLKT S
res
res
res
res
res
CLKT S Clock T hree-State. If the BM bit is HI, and the CLKT S bit is HI, then the CLKOUT pin will be three-stated. If the BM
bit is HI, and the bit CLKT S is LO, then the CLKOUT pin is not three-stated. If the BM bit is LO, then the CLKOUT
pin is always three-stated.
XCT L1:0 External Control. T he state of these independent bits is reflected on the respective XCT L1 and XCT L0 pins of the
AD1847.
0
1
T T L logic LO on XCT L1, XCT L0 pins
T T L logic HI on XCT L1, XCT L0 pins
res
Reserved for future expansion. Write zeros (LO) to all reserved bits.
T his register’s initial state after reset is: 0000 0000 (00h).
Invalid Addr ess (Index Addr ess 11)
IA3:0
D ata 7
D ata 6
D ata 5
D ata 4
D ata 3
D ata 2
D ata 1
D ata 0
1011
inval
inval
inval
inval
inval
inval
inval
inval
inval
Writes to this index address are ignored. Index readback of this index address will return the Status Word.
–16–
REV. B
ADI [ ADI ]
