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AD5647R Datasheet(PDF) 23 Page - Analog Devices

No. de pieza AD5647R
Descripción Electrónicos  Dual, 12-/14-/16-Bit nanoDACs with 5ppm/C On-Chip Ref, I2C Interface
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AD5647R Datasheet(HTML) 23 Page - Analog Devices

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Preliminary Technical Data
AD5627R/AD5647R/AD5667R, AD5627/AD5667
Rev. PrA. | Page 23 of 30
STOP
LEAST SIGNIFICANT
DATA BYTE
MOST SIGNIFICANT
DATA BYTE
COMMAND
BYTE
BLOCK 1
S=1
SLAVE
ADDRESS
LEAST SIGNIFICANT
DATA BYTE
MOST SIGNIFICANT
DATA BYTE
BLOCK 2
S=1
LEAST SIGNIFICANT
DATA BYTE
MOST SIGNIFICANT
DATA BYTE
BLOCK n
S=1
Figure 56. Multiple Block Write With Initial Command Byte Only (S=1)
BROADCAST MODE
In addition to the unique slave address for each device, which is
set by the address pin(s), The AD56x7 has a broadcast address
to which any AD56x7 will respond, irrespective of the state of
the address pin(s). This address is 0001000(Write). Where
several AD56x7 devices are connected to a bus, they can all be
sent the same data using the broadcast address. The broadcast
address only works for write operations. It is not possible to
read back data from several devices at the same time, due to bus
contention.
INPUT SHIFT REGISTER
The input shift register is 24 bits wide to store the 3 data bytes
written to the device of the serial interface. Data written to the
device is split into four sections:
- One bit to select multiple byte operation.
- a three bit command that tells the device what operation to
perform.
- a three-bit address that tells the device to which DAC or
DACs the command applies.
- 16 bits of data, which, depending on the command may be
written to a DAC or used to define the parameters of a
command operation.
Bit 23 of the input shift register is reserved, and should always
be set to 0 when writing to the device.
The command and address are contained in the command byte,
the 8 MSBs of the input register. The middle 8 bits are the high
byte of the DAC data, while the 8 least significant bits are the
low byte of the DAC data or command data. DAC data is left
justified, so the two LSBs are unused for the 14 bit AD5647R,
and the four LSBs are unused for the 12-bit AD5627R (but they
are still used for command data in these devices.
The AD56x7 has seven different commands that can be written
to it.
C2
C1
C0
A2
A1
A0
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D2
D3
D1
D0
S
R
COMMAND
DAC ADDRESS
DAC DATA
DAC OR COMMAND DATA
COMMAND BYTE
DATA HIGH BYTE
DATA LOW BYTE
DB23 DB22 DB21 DB20 DB19 DB18 DB17 DB16 DB15 DB14 DB13 DB12 DB11 DB10
DB9
DB8
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
Figure 57. AD5667R/AD5667 Input Shift Register (16-Bit DAC)
C2
C1
C0
A2
A1
A0
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D2
D3
D1
D0
S
R
COMMAND
DAC ADDRESS
DAC DATA
DAC OR COMMAND DATA
COMMAND BYTE
DATA HIGH BYTE
DATA LOW BYTE
DB23 DB22 DB21 DB20 DB19 DB18 DB17 DB16 DB15 DB14 DB13 DB12 DB11 DB10
DB9
DB8
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
X
X
Figure 58. AD5647R Input Shift Register (14-Bit DAC)


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