AD5755 Analog Devices, AD5755 Datasheet - Page 36

• Manufacturer Part Number: AD5755
• Description: Quad Channel, 16-Bit, Serial Input,
• Manufacturer: Analog Devices

Specifications of AD5755

• Resolution (bits): 16bit
• Dac Update Rate: 91kSPS
• Dac Settling Time: 11µs
• Max Pos Supply (v): +33V
• Single-supply: No
• Dac Type: I or V Out
• Dac Input Format: SPI

AD5755
DAC Control Register
The DAC control register is used to configure each DAC channel. The DAC control register options are shown in Table 20 and Table 21.
Table 20. Programming DAC Control Register
D15
0
1
Table 21. DAC Control Register Functions
Bit
INT_ENABLE
CLR_EN
OUTEN
RSET
DC_DC
OVRNG
R2, R1, R0
X = don’t care.
D14
1
D13
0
Per channel clear enable bit. Selects if this channel clears when the CLEAR pin is activated.
Selects an internal or external current sense resistor for the selected DAC channel.
Powers the dc-to-dc converter on the selected channel.
Enables 20% overrange on voltage output channel only. No current output overrange available.
Selects the output range to be enabled.
Description
Powers up the dc-to-dc converter, DAC, and internal amplifiers for the selected channel. Does not enable the output. Can
only be done on a per channel basis. It is recommended to set this bit and allow a >200 μs delay before enabling the
output because this results in a reduced output enable glitch. See Figure 29 and Figure 47 for plots of this glitch.
CLR_EN = 1, channel clears when the part is cleared.
CLR_EN = 0, channel does not clear when the part is cleared (default).
Enables/disables the selected output channel.
OUTEN = 1, enables channel.
OUTEN = 0, disables channel (default).
RSET = 0, selects the external resistor (default).
RSET = 1, selects the internal resistor.
DC_DC = 1, powers up the dc-to-dc converter.
DC_DC = 0, powers down the dc-to-dc converter (default).
This allows per channel dc-to-dc converter power-up/down. To power down the dc-to-dc converter, the OUTEN and
INT_ENABLE bits must also be set to 0.
All dc-to-dc converters can also be powered up simultaneously using the DCDC_All bit in the main control register.
OVRNG = 1, enabled.
OVRNG = 0, disabled (default).
R2
0
0
0
0
1
1
1
D12
X
1
D11
X
R1
0
0
1
1
0
0
1
1
D10
X
1
R0
0
1
0
1
0
1
0
D9
X
1
D8
INT_ENABLE
Rev. A | Page 36 of 52
Output Range Selected
0 V to 5 V voltage range (default).
0 V to 10 V voltage range.
±5 V voltage range.
±10 V voltage range.
4 mA to 20 mA current range.
0 mA to 20 mA current range.
0 mA to 24 mA current range.
D7
CLR_EN
D6
OUTEN
D5
RSET
D4
DC_DC
D3
OVRNG
Data Sheet
D2
R2
D1
R1
D0
R0