AD5384 Analog Devices, AD5384 Datasheet - Page 26

• 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
INTERFACES
The AD5384 contains a serial interface that can be
programmed either as DSP-, SPI-, MICROWIRE-, or I
compatible. The SPI/ I2C pin is used to select DSP, SPI,
MICROWIRE, or I
power consumption of the device and the on-chip digital noise,
the active interface powers up fully only when the device is
being written to, i.e., on the falling edge of SYNC .
DSP-, SPI-, MICROWIRE-COMPATIBLE SERIAL
INTERFACES
The serial interface can be operated with a minimum of three
wires in standalone mode or five wires in daisy-chain mode.
Daisy chaining allows many devices to be cascaded together to
increase system channel count. The SPI/ I2C (Ball B8) should be
tied high to enable the DSP-, SPI-, MICROWIRE-compatible
serial interface. The serial interface control pins are
Figure 3 and Figure 5 show the timing diagrams for a serial
write to the AD5384 in standalone and in daisy-chain modes.
The 24-bit data-word format for the serial interface is shown in
Table 20.
Table 20. 40-Channel, 14-Bit DAC Serial Input Register Configuration
MSB
A /B
SYNC , DIN, SCLK—Standard 3-Wire Interface Pins.
DCEN—Selects Standalone Mode or Daisy-Chain Mode.
SDO—Data Out Pin for Daisy-Chain Mode.
R/ W
A5
A4
2
C interface mode. To minimize both the
A3
A2
A1
A0
REG1
REG0
2
C-
DB13
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DB12
DB11
A /B. When toggle mode is enabled, this selects whether the
data write is to the A or B register, with Toggle disabled this bit
should be set to zero to select the A data register.
R/ W is the read or write control bit.
A5–A0 are used to address the input channels.
REG1 and REG0 select the register to which data is written, as
shown in Table 12.
DB13–DB0 contain the input data-word.
X is a don’t care condition.
Standalone Mode
By connecting DCEN (daisy-chain enable) pin low, standalone
mode is enabled. The serial interface works with both a
continuous and a noncontinuous serial clock. The first falling
edge of SYNC starts the write cycle and resets a counter that
counts the number of serial clocks to ensure that the correct
number of bits are shifted into the serial shift register. Any
further edges on SYNC , except for a falling edge, are ignored
until 24 bits are clocked in. Once 24 bits are shifted in, the
SCLK is ignored. For another serial transfer to take place, the
counter must be reset by the falling edge of SYNC .
DB10
DB9
DB8
DB7
DB6
DB5
DB4
DB3
DB2
DB1
LSB
DB0