EVAL-AD7730LEB View Datasheet(PDF) - Analog Devices
Part Name
Description
MFG CO.
'EVAL-AD7730LEB' PDF : 52 Pages View PDF
AD7730/AD7730L
Table V. Summary of On-Chip Registers
Register Name
Type
Size
Communications
Register
Write Only 8 Bits
WEN ZERO RW1 RW0 ZERO RS2
Power-On/Reset
Default Value
Not Applicable
RS1 RS0
Function
All operations to other registers are initiated through
the Communications Register. This controls whether
subsequent operations are read or write operations
and also selects the register for that subsequent
operation. Most subsequent operations return con-
trol to the Communications Register except for the
continuous read mode of operation.
Status Register
Read Only 8 Bits
RDY STDY STBY NOREF MS3 MS2
CX Hex
MS1 MS0
Provides status information on conversions, calibra-
tions, settling to step inputs, standby operation and
the validity of the reference voltage.
Data Register
Read Only 16 Bits or 24 Bits 000000 Hex
Provides the most up-to-date conversion result from
the part. Register length can be programmed to be
16 bits or 24 bits.
Mode Register
Read/Write 16 Bits
MD2 MD1
HIREF ZERO
MD0
RN1
B/U DEN D1
RN0 CLKDIS BO
01B0 Hex
D0
CH1
WL
CH0
Controls functions such as mode of operation, uni-
polar/bipolar operation, controlling the function of
AIN2(+)/D1 and AIN2(-)/D0, burnout current,
Data Register word length and disabling of MCLK
OUT. It also contains the reference selection bit, the
range selection bits and the channel selection bits.
Filter Register
Read/Write 24 Bits
200010 Hex
SF11 SF10 SF9
SF3 SF2 SF1
ZERO ZERO AC
SF8
SF0
CHP
SF7 SF6 SF5
ZERO ZERO SKIP
DL3 DL2 DL1
SF4
FAST
DL0
Controls the amount of averaging in the first stage
filter, selects the fast step and skip modes and con-
trols the ac excitation and chopping modes on the
part.
DAC Register
Read/Write 8 Bits
20 Hex
ZERO ZERO DAC5 DAC4 DAC3 DAC2 DAC1 DAC0
Offset Register
Read/Write 24 Bits
800000 Hex
Gain Register
Read/Write 24 Bits
59AEE7 Hex
Test Register
Read/Write 24 Bits
000000 Hex
Provides control of the amount of correction per-
formed by the Offset/TARE DAC.
Contains a 24-bit word which is the offset calibration
coefficient for the part. The contents of this register
are used to provide offset correction on the output
from the digital filter. There are three Offset Regis-
ters on the part and these are associated with the
input channels as outlined in Table XIII.
Contains a 24-bit word which is the gain calibration
coefficient for the part. The contents of this register
are used to provide gain correction on the output
from the digital filter. There are three Gain Registers
on the part and these are associated with the input
channels as outlined in Table XIII.
Controls the test modes of the part which are used
when testing the part. The user is advised not to
change the contents of this register.
–12–
REV. A
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