參數(shù)資料
型號(hào)： EVAL-AD7938CBZ
廠商： Analog Devices Inc
文件頁數(shù)： 8/36頁
文件大?。?/td> 0K
描述： EVAL BOARD FOR AD7938
標(biāo)準(zhǔn)包裝： 1
ADC 的數(shù)量： 1
位數(shù)： 12
采樣率（每秒）： 1.5M
數(shù)據(jù)接口： 并聯(lián)
輸入范圍： ±VREF
在以下條件下的電源（標(biāo)準(zhǔn)）： 13.5mW @ 5V
工作溫度： -40°C ~ 85°C
已用 IC / 零件： AD7938
已供物品： 板，CD
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其它名稱： Q3627458
AD7938/AD7939
Data Sheet
Rev. C | Page 16 of 36
SEQUENCER OPERATION
The configuration of the SEQ and SHDW bits in the control
register allows the user to select a particular mode of operation
of the sequencer function. Table 11 outlines the four modes of
operation of the sequencer.
Writing to the Control Register to Program the Sequencer
The AD7938/AD7939 need 13 full CLKIN periods to perform a
conversion. If the ADC does not receive the full 13 CLKIN
periods, the conversion aborts. If a conversion is aborted after
applying 12.5 CLKIN periods to the ADC, ensure that a rising
edge of CONVST or a falling edge of CLKIN is applied to the
part before writing to the control register to program the
sequencer. If these conditions are not met, the sequencer will
not be in the correct state to handle being reprogrammed for
another sequence of conversions and the performance of the
converter is not guaranteed.
Table 10. Analog Input Type Selection
Channel Address
MODE0 = 0, MODE1 = 0
MODE0 = 0, MODE1 = 1
MODE0 = 1, MODE1 = 0
MODE0 = 1, MODE1 = 1
Eight Single-Ended
Input Channels
Four Fully Differential
Input Channels
Four Pseudo Differential Input
Channels (Pseudo Mode 1)
Seven Pseudo Differential Input
Channels (Pseudo Mode 2)
ADD2
ADD1
ADD0
VIN+
VIN
VIN+
VIN
VIN+
VIN
VIN+
VIN
0
VIN0
AGND
VIN0
VIN1
VIN0
VIN1
VIN0
VIN7
0
1
VIN1
AGND
VIN1
VIN0
VIN1
VIN0
VIN1
VIN7
0
1
0
VIN2
AGND
VIN2
VIN3
VIN2
VIN3
VIN2
VIN7
0
1
VIN3
AGND
VIN3
VIN2
VIN3
VIN2
VIN3
VIN7
1
0
VIN4
AGND
VIN4
VIN5
VIN4
VIN5
VIN4
VIN7
1
0
1
VIN5
AGND
VIN5
VIN4
VIN5
VIN4
VIN5
VIN7
1
0
VIN6
AGND
VIN6
VIN7
VIN6
VIN7
VIN6
VIN7
1
VIN7
AGND
VIN7
VIN6
VIN7
VIN6
Not Allowed
Table 11. Sequence Selection
SEQ
SHDW
Sequence Type
0
This configuration is selected when the sequence function is not used. The analog input channel selected on each
individual conversion is determined by the contents of the channel address bits, ADD2 to ADD0, 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 AD7938/AD7939 selects the next channel for conversion.
0
1
This configuration selects the shadow register for programming. The following write operation loads the data on DB0 to
DB7 to the shadow register. This programs the sequence of channels to be converted continuously after each CONVST
falling edge. See the Shadow Register section and Table 12.
1
0
If the SEQ and SHADOW bits are set in this way, the sequence function is not 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.
1
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 through to a selected final channel as determined by
the channel address bits in the control register.
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