AD5384 Analog Devices, AD5384 Datasheet - Page 30

• Manufacturer Part Number: AD5384
• Description: 40-Channel, 3 V/5 V Single Supply,14-Bit, Serial Voltage-Output DAC
• Manufacturer: Analog Devices

Specifications of AD5384

• Resolution (bits): 14bit
• Dac Update Rate: 125kSPS
• Dac Settling Time: 8µs
• Max Pos Supply (v): +5.5V
• Single-supply: Yes
• Dac Type: Voltage Out
• Dac Input Format: I2C/Ser 2-wire,Ser,SPI

AD5384
2-Byte Mode
Following initialization of 2-byte mode, the user can update
channels sequentially. The device address byte is required only
once, and the pointer address pointer is configured for auto-
increment or burst mode.
The user must begin with an address byte (R/ W = 0), after
which the DAC acknowledges that it is prepared to receive data
by pulling SDA low. The address byte is followed by a specific
pointer byte (0xFF) that initiates the burst mode of operation.
The address pointer initializes to Channel 0,and, upon receiving
the two data bytes for the present address, automatically
increments to the next address.
SDA
SDA
SDA
SDA
SCL
SCL
SCL
SCL
START COND
BY MASTER
REG1
REG1
1
REG1
REG0
REG0
0
MOST SIGNIFICANT DATA BYTE
MOST SIGNIFICANT DATA BYTE
REG0
MOST SIGNIFICANT DATA BYTE
ADDRESS BYTE
MSB
MSB
1
MSB
0
1
AD1
AD0
Figure 31. 2-Byte, 1
CHANNEL N DATA FOLLOWED BY STOP
LSB
LSB
ACK BY
AD538x
R/W
Rev. A | Page 30 of 36
LSB
ACK BY
ACK BY
AD538x
AD538x
CHANNEL 0 DATA
CHANNEL 1 DATA
ACK BY
AD538x
2
C Write Operation
MSB
MSB
MSB
0
The REG0 and REG1 bits in the data byte determine which
register is updated. In this mode, following the initialization,
only the two data bytes are required to update a channel. The
channel address automatically increments from Address 0. This
mode allows transmission of data to all channels in one block
and reduces the software overhead in configuring all channels.
A stop condition at any time exits this mode. Toggle mode is
not supported in 2-byte mode. Figure 31 shows a typical
configuration.
MSB
0
A5 = 1 A4 = 1 A3 = 1 A2 = 1 A1 = 1 A0 = 1
LEAST SIGNIFICANT DATA BYTE
LEAST SIGNIFICANT DATA BYTE
LEAST SIGNIFICANT DATA BYTE
POINTER BYTE
LSB
LSB
CONVERTER
ACK BY
ACK BY
AD538x
AD538x
ACK BY
CONVERTER
LSB
ACK BY
MASTER
COND
STOP
BY