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參數(shù)資料
型號(hào): AD7908BRU-REEL
廠商: ANALOG DEVICES INC
元件分類: ADC
英文描述: 8-Channel, 1 MSPS, 8-/10-/12-Bit ADCs with Sequencer in 20-Lead TSSOP
中文描述: 8-CH 8-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20
封裝: MO-153AC, TSSOP-20
文件頁(yè)數(shù): 14/24頁(yè)
文件大小: 607K
代理商: AD7908BRU-REEL
AD7908/AD7918/AD7928
REV. A
Table II. Channel Selection
ADD2
ADD1
ADD0
Analog Input Channel
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
V
IN
0
V
IN
1
V
IN
2
V
IN
3
V
IN
4
V
IN
5
V
IN
6
V
IN
7
Table III. Power Mode Selection
PM1 PM0 Mode
1
1
Normal Operation
. In this mode, the AD7908/
AD7918/AD7928 remain in full power mode
regardless of the status of any of the logic inputs.
This mode allows the fastest possible throughput
rate from the AD7908/AD7918/AD7928.
Full Shutdown
. In this mode, the AD7908/
AD7918/AD7928 is in full shutdown mode with
all circuitry powering down. The AD7908/AD7918/
AD7928 retains the information in the Control
Register while in full shutdown. The part remains in
full shutdown until these bits are changed.
Auto Shutdown
. In this mode, the AD7908/
AD7918/AD7928 automatically enters full
shutdown mode at the end of each conversion
when the control register is updated. Wake-up
time from full shutdown is 1 μs and the user
should ensure that 1 μs has elapsed before
attempting to perform a valid conversion on the
part in this mode.
Invalid Selection
. This configuration is not allowed.
1
0
0
1
0
0
SEQUENCER OPERATION
The configuration of the SEQ and SHADOW bits in the
Control Register allows the user to select a particular mode of
operation of the sequencer function. Table IV outlines the four
modes of operation of the Sequencer.
Table IV. Sequence Selection
SEQ SHADOW
Sequence Type
0
0
This configuration means that the sequence
function is not used. The analog input
channel selected for each individual
conversion is determined by the contents of
the channel address bits ADD0 through
ADD2 in each prior write operation. This
mode of operation reflects the traditional
operation of a multichannel ADC, without
the Sequencer function being used, where
each write to the AD7908/AD7918/
AD7928 selects the next channel for
conversion. (See Figure 2.)
This configuration selects the SHADOW
Register for programming. The following
write operation will load the contents of the
SHADOW Register. This will program the
sequence of channels to be converted on
continuously with each successive valid
CS
falling edge. (See SHADOW Register
section, Table V, and Figure 3.) The
channels selected need not be consecutive.
If the SEQ and SHADOW bits are set in
this way, then the sequence function will
not be interrupted upon completion of the
WRITE operation. This allows other bits in
the Control Register to be altered between
conversions while in a sequence, without
terminating the cycle.
This configuration is used in conjunction
with the channel address bits ADD2 to
ADD0 to program continuous conversions
on a consecutive sequence of channels from
Channel 0 to a selected final channel as
determined by the channel address bits in
the Control Register. (See Figure 4.)
0
1
1
0
1
1
–14–
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