AD5382 Analog Devices, AD5382 Datasheet - Page 22

• Manufacturer Part Number: AD5382
• Description: 32-Channel 14-Bit 3 V/5 V Single-Supply Voltage-Output DAC
• Manufacturer: Analog Devices

Specifications of AD5382

• 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: Par,Ser,SPI

AD5382
Table 14. Gain Data Format (REG1 = 0, REG0 = 1)
11
10
01
00
00
ON-CHIP SPECIAL FUNCTION REGISTERS (SFR)
The AD5382 contains a number of special function registers
(SFRs), as outlined in Table 15. SFRs are addressed with
REG1 = REG0 = 0 and are decoded using Address Bits A4 to A0.
Table 15. SFR Register Functions (REG1 = 0, REG0 = 0)
R/W
X
0
0
0
0
0
1
0
0
SFR COMMANDS
NOP (No Operation)
REG1 = REG0 = 0, A4–A0 = 00000
Performs no operation but is useful in serial readback mode to
clock out data on D
low during a NOP operation.
Write Clear Code
REG1 = REG0 = 0, A4–A0 = 00001
DB13–DB0 = Contain the clear code data
Bringing the CLR line low or exercising the soft clear function
loads the contents of the DAC registers with the data contained
in the user-configurable Clear register, and sets VOUT0 to
VOUT31 accordingly. This can be very useful for setting up a
specific output voltage in a clear condition. It is also beneficial
for calibration purposes; the user can load full scale or zero
scale to the clear code register and then issue a hard-ware or
software clear to load this code to all DACs, removing the
need for individual writes to each DAC. Default on power-up
is all zeros.
A4
0
0
0
0
0
0
0
0
0
1111
1111
1111
0111
0000
DB13 to DB0
A3
0
0
0
1
1
1
1
1
1
1111
1111
1111
1111
0000
OUT
A2
0
0
0
0
0
1
1
0
1
for diagnostic purposes. BUSY pulses
1110
1110
1110
1110
0000
A1
0
0
1
0
0
0
0
1
1
A0
0
1
0
0
1
0
0
0
1
Gain Factor
1
0.75
0.5
0.25
0
Function
NOP (No Operation)
Write Clear Code
Soft Clear
Soft Power-Down
Soft Power-Up
Control Register Write
Control Register Read
Monitor Channel
Soft Reset
Rev. B | Page 22 of 40
Soft Clear
REG1 = REG0 = 0, A4–A0 = 00010
DB13–DB0 = Don’t Care
Executing this instruction performs a software clear, which is
functionally the same as that provided by the external CLR pin.
The DAC outputs are loaded with the data in the Clear Code.
register (
and is indicated by the
Soft Power-Down
REG1 = REG0 = 0, A4–A0 = 01000
DB13–DB0 = Don’t Care
Executing this instruction performs a global power-down
feature that puts all channels into a low power mode that
reduces the analog supply current to 2 μA max and the digi-
tal current to 20 μA max. In power-down mode, the output
amplifier can be configured as a high impedance output or
provide a 100 kΩ load to ground. The contents of all internal
registers are retained in power-down mode. No register can
be written to while in power-down.
Soft Power-Up
REG1 = REG0 = 0, A4–A0 = 01001
DB13–DB0 = Don’t Care
This instruction is used to power up the output amplifiers and
the internal reference. The time to exit power-down is 8 μs.
The hardware power-down and software functions are
internally combined in a digital OR function.
Soft RESET
REG1 = REG0 = 0, A4–A0 = 01111
DB13–DB0 = Don’t Care
This instruction is used to implement a software reset.
All internal registers are reset to their default values, which
correspond to m at full scale and c at zero. The contents of
the DAC registers are cleared, setting all analog outputs to 0 V.
The soft reset activation time is 135 μs max.
Table 15
). It takes 35 μs to fully execute the Soft Clear
BUSY low time.