AD5392 Analog Devices, AD5392 Datasheet - Page 32

• Manufacturer Part Number: AD5392
• Description: 8-Channel 14-Bit Single-Supply Voltage-Output DAC
• Manufacturer: Analog Devices

Specifications of AD5392

• 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

AD5390/AD5391/AD5392
CONTROL REGISTER WRITE
Table 25 shows the control register contents for the AD5390 and the AD5392. Table 26 provides bit descriptions. Note that REG1 = REG0 = 0,
A3 to A0 = 1100, and DB13 to DB0 contain the control register data.
Table 25. AD5390/AD5392 Control Register Contents
MSB
CR13
Table 26. AD5390 and AD5392 Bit Descriptions
Bit
CR13
CR12
CR11
CR10
CR9
CR8
CR7 to CR4
CR3 to CR2
CR1 to CR0
CR12
Description
Power-Down Status. This bit is used to configure the output amplifier state in power–down mode.
CR13 = 1: Amplifier output is high impedance (default on power-up).
CR13 = 0: Amplifier output is 100 kΩ to ground.
REF Select. This bit selects the operating internal reference for the AD539x. CR12 is programmed as follows:
CR12 = 1: Internal reference is 2.5 V (AD5390-2/AD5392-5 default). Recommended operating reference for AD539x-5.
CR12 = 0: Internal reference is 1.25 V (AD5390-3/AD5392-3 default). Recommended operating reference for AD5390-3 and
AD5392-3.
Current Boost Control. This bit is used to boost the current in the output amplifier, thus altering its slew rate and is
configured as follows:
CR11 = 1: Boost mode on. This maximizes the bias current in the output amplifier, optimizing its slew rate but increasing
the power dissipation.
CR11 = 0: Boost mode off (default on power-up). This reduces the bias current in the output amplifier and reduces the
overall power consumption.
Internal/External Reference. This bit determines if the DAC uses its internal reference or an external reference.
CR10 = 1: Internal reference enabled. Reference output depends on data loaded to CR12.
CR10 = 0: External reference selected (default on power-up).
Channel Monitor Enable (see Table 23).
CR9 = 1: Monitor enabled. This enables the channel monitor function. Following a write to the monitor channel in the SFR
register, the selected channel output is routed to the MON_OUT pin.
CR9 = 0: Monitor disabled (default on power-up). When monitor is disabled, the MON_OUT pin is three-stated.
Thermal Monitor Function. When enabled, this function is used to monitor the internal die temperature of the
AD5390/AD5392. The thermal monitor powers down the output amplifiers when the temperature exceeds 130°C. This
function can be used to protect the device when the power dissipation of the device may be exceeded, if a number of
output channels are simultaneously short circuited. A soft power-up re-enables the output amplifiers if the die
temperature has dropped below 130°C.
CR8 = 1: Thermal monitor enabled.
CR8 = 0: Thermal monitor disabled (default on power-up).
Don’t Care.
Toggle Function Enable. This function lets the user toggle the output between two codes loaded to the A and B register
for each DAC. Control Register Bits CR3 and CR2 are used to enable individual groups of eight channels for operation in
toggle mode on the AD5390 and AD5392, as follows:
CR3
CR2
CR2 is the only active bit on the AD5392. Logic 1 written to any bit enables a group of channels and Logic 0 disables a
group. LDAC is used to toggle between the two registers.
Don’t Care.
CR11
Group 1
Group 0
CR10
Channel 8 to Channel 15
Channel 0 to Channel 7
CR9
CR8
Rev. C | Page 32 of 40
CR7
CR6
CR5
CR4
CR3
CR2
CR1
LSB
CR0