參數(shù)資料
型號： EVAL-AD7327SDZ
廠商： Analog Devices Inc
文件頁數(shù)： 17/37頁
文件大?。?/td> 0K
描述： BOARD EVAL FOR AD7327SDZ
標(biāo)準(zhǔn)包裝： 1
系列： *
Data Sheet
AD7327
Rev. B | Page 23 of 36
The eight analog input channels can be configured as seven pseudo differential analog inputs, four pseudo differential inputs, four true
differential inputs, or eight single-ended analog inputs.
Table 10. Analog Input Configuration Selection
Mode 1 = 1, Mode 0 = 1
Mode 1 = 1, Mode 0 = 0
Mode 1 = 0, Mode 0 =1
Mode 1 = 0, Mode 0 = 0
Channel Address Bits
7 Pseudo Differential Inputs
4 Fully Differential Inputs
4 Pseudo Differential Inputs
8 Single-Ended Inputs
ADD2
ADD1
ADD0
VIN+
VIN
VIN+
VIN
VIN+
VIN
VIN+
VIN
0
VIN0
VIN7
VIN0
VIN1
VIN0
VIN1
VIN0
AGND
0
1
VIN1
VIN7
VIN0
VIN1
VIN0
VIN1
AGND
0
1
0
VIN2
VIN7
VIN2
VIN3
VIN2
VIN3
VIN2
AGND
0
1
VIN3
VIN7
VIN2
VIN3
VIN2
VIN3
AGND
1
0
VIN4
VIN7
VIN4
VIN5
VIN4
VIN5
VIN4
AGND
1
0
1
VIN5
VIN7
VIN4
VIN5
VIN4
VIN5
AGND
1
0
VIN6
VIN7
VIN6
VIN7
VIN6
VIN7
VIN6
AGND
1
Temperature indicator
VIN6
VIN7
VIN6
VIN7
AGND
Table 11. Power Mode Selection
PM1
PM0
Description
1
Full Shutdown Mode. In this mode, all internal circuitry on the AD7327 is powered down. Information in the control register
is retained when the AD7327 is in full shutdown mode.
1
0
Autoshutdown Mode. The AD7327 enters autoshutdown on the 15th SCLK rising edge when the control register is updated.
All internal circuitry is powered down in autoshutdown.
0
1
Autostandby Mode. In this mode, all internal circuitry is powered down, excluding the internal reference. The AD7327 enters
autostandby mode on the 15th SCLK rising edge after the control register is updated.
0
Normal Mode. All internal circuitry is powered up at all times.
Table 12. Sequencer Selection
Seq1
Seq2
Description
0
The channel sequencer is not used. The analog input channel, selected by programming the ADD2 bit to ADD0 bit in the
control register, selects the next channel for conversion.
0
1
Uses the sequence of channels previously programmed into the sequence register for conversion. The AD7327 starts
converting on the lowest channel in the sequence. The channels are converted in ascending order. If uninterrupted, the
AD7327 keeps converting the sequence. The range for each channel defaults to the range previously written into the
corresponding range register.
1
0
Used in conjunction with the channel address bits in the control register. This allows continuous conversions on a
consecutive sequence of channels, from Channel 0 up to and including a final channel selected by the channel address bits
in the control register. The range for each channel defaults to the range previously written into the corresponding range
register.
1
The channel sequencer is not used. The analog channel, selected by programming the ADD2 bit to ADD0 bit in the control
register, selects the next channel for conversion.
SEQUENCE REGISTER
The sequence register on the AD7327 is an 8-bit, write-only register. Each of the eight analog input channels has one corresponding bit
in the sequence register. To select an analog input channel for inclusion in the sequence, set the corresponding channel bit to 1 in the
sequence register.
MSB
LSB
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
Write
Register Select 1
Register Select 2
VIN0
VIN1
VIN2
VIN3
VIN4
VIN5
VIN6
VIN7
0
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