參數(shù)資料
型號(hào)： TLC32040MFK
廠商： Texas Instruments, Inc.
英文描述： ANALOG INTERFACE CIRCUIT
中文描述： 模擬接口電路
文件頁(yè)數(shù)： 10/30頁(yè)
文件大?。?/td> 202K
代理商： TLC32040MFK
TLC32040M
ANALOG INTERFACE CIRCUIT
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
4–10
improper operation due to conversion times being too close together
If the difference between two successive D/A conversion frame syncs is less than 1/19.2 kHz, the AIC operates
improperly. In this situation, the second D/A conversion frame sync occurs too quickly, and there is not enough
time for the ongoing conversion to be completed. This situation can occur if the A and B registers are improperly
programmed or if the A + A’ register or A – A’ register result is too small. When incrementally adjusting the
conversion period via the A + A’ register options, the designer should be careful not to violate this requirement
(see following diagram).
t1
Frame Sync,
FSX, or FSR
Ongoing Conversion
t2
t2 – t1
≥
1/19.2 kHz
asynchronous operation – more than one receive frame sync occurring between two transmit
frame syncs
When incrementally adjusting the conversion period via the A + A’ or A – A’ register options, a specific protocol
is followed. The command to use the incremental conversion period adjust option is sent to the AIC during an
FSX frame sync. The ongoing conversion period is then adjusted. However, either Receive Conversion Period
A or B may be adjusted. For both transmit and receive conversion periods, the incremental conversion period
adjustment is performed near the end of the conversion period. Therefore, if there is sufficient time between t
1
and t
2
, the receive conversion period adjustment will be performed during Receive Conversion Period A.
Otherwise, the adjustment will be performed during Receive Conversion Period B. The adjustment command
only adjusts one transmit conversion period and one receive conversion period. To adjust another pair of
transmit and receive conversion periods, another command must be issued during a subsequent FSX frame
(see figure below).
t1
t2
FSR
FSX
Transmit Conversion Period
Receive
Conversion
Period A
Receive
Conversion
Period B
asynchronous operation – more than one transmit frame sync occurring between two receive
frame syncs
When incrementally adjusting the conversion period via the A + A’ or A – A’ register options, a specific protocol
is followed. For both transmit and receive conversion periods, the incremental conversion period adjustment
is performed near the end of the conversion period. The command to use the incremental conversion period
adjust options is sent to the AIC during an FSX frame sync. The ongoing transmit conversion period is then
adjusted. However, three possibilities exist for the receive conversion period adjustment in the diagram as
shown in the figure on the following page. If the adjustment command is issued during Transmit Conversion
Period A, Receive Conversion Period A will be adjusted if there is sufficient time between t
1
and t
2
. If there is
not sufficient time between t
1
and t
2
, Receive Conversion Period B will be adjusted. The receive portion of an
adjustment command may be ignored if the adjustment command is sent during a receive conversion period,
which is already being or will be adjusted due to a prior adjustment command. For example, if adjustment
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