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AD5678 Datasheet(PDF) 24 Page - Analog Devices

Part No. AD5678
Description  On-Chip Reference in 14-Lead TSSOP
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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AD5678 Datasheet(HTML) 24 Page - Analog Devices

 
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AD5678
Rev. C | Page 24 of 28
Table 9. Internal Reference Register
Internal REF Register (DB0)
Action
0
Reference off (default)
1
Reference on
Table 10. 32-Bit Input Shift Register Contents for Reference Set-Up Function
MSB
LSB
DB31 to DB28
DB27
DB26
DB25
DB24
DB23
DB22
DB21
DB20
DB19 to DB1
DB0
X
1
0
0
0
X
X
X
X
X
1/0
Don’t cares
Command bits (C3 to C0)
Address bits (A3 to A0)
Don’t cares
Internal REF
register
Table 11. Power-Down Modes of Operation
DB9
DB8
Operating Mode
0
0
Normal operation
Power-down modes
0
1
1 kΩ to GND
1
0
100 kΩ to GND
1
1
Three-state
Table 12. 32-Bit Input Shift Register Contents for Power-Down/Power-Up Function
MSB
LSB
DB31
to
DB28
DB27
DB26
DB25
DB24
DB23
DB22
DB21
DB20
DB19
to
DB10
DB9
DB8
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
X
0
1
0
0
X
X
X
X
X
PD1
PD0
DAC
H
DAC
G
DAC
F
DAC
E
DAC
D
DAC
C
DAC
B
DAC
A
Don’t
cares
Command bits (C3 to C0)
Address bits (A3 to A0)—
don’t cares
Don’t
cares
Power-
down mode
Power-down/power-up channel selection—set bit to 1 to select
RESISTOR
NETWORK
VOUT
VFB
RESISTOR
STRING DAC
POWER-DOWN
CIRCUITRY
AMPLIFIER
Figure 50. Output Stage During Power-Down
Table 13. Clear Code Register
Clear Code Register
DB1
DB0
CR1
CR0
Clears to Code
0
0
0x0000
0
1
0x8000
1
0
0xFFFF
1
1
No operation
Table 14. 32-Bit Input Shift Register Contents for Clear Code Function
MSB
LSB
DB31 to DB28
DB27
DB26
DB25
DB24
DB23
DB22
DB21
DB20
DB19 to DB2
DB1
DB0
X
0
1
0
1
X
X
X
X
X
CR1
CR0
Don’t cares
Command bits (C3 to C0)
Address bits (A3 to A0)—don’t cares
Don’t cares
Clear code register


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