AD5735 Analog Devices, AD5735 Datasheet - Page 35

• Manufacturer Part Number: AD5735
• Description: Quad Channel, 12-Bit, Serial Input, 4-20 mA & Voltage Output DAC with Dynamic Power Control
• Manufacturer: Analog Devices

Specifications of AD5735

• Resolution (bits): 12bit
• Dac Settling Time: 11µs
• Max Pos Supply (v): +33V
• Single-supply: No
• Dac Type: I or V Out
• Dac Input Format: SPI

DAC Control Register
The DAC control register is used to configure each DAC channel. The DAC control register options are shown in Table 23 and Table 24.
Table 23. Programming the DAC Control Register
D15
0
1
Table 24. DAC Control Register Bit Descriptions
Bit Name
INT_ENABLE
CLR_EN
OUTEN
RSET
DC_DC
OVRNG
R2, R1, R0
Data Sheet
X = don’t care.
D14
1
D13
0
Description
Powers up the dc-to-dc converter, DAC, and internal amplifiers for the selected channel. This bit applies to individual
channels only; it does not enable the output. After setting this bit, it is recommended that a >200 μs delay be observed
before enabling the output to reduce the output enable glitch. See Figure 29 and Figure 46 for plots of this glitch.
Per-channel clear enable bit. This bit specifies whether the selected channel is cleared when the CLEAR pin is activated.
0 = channel is not cleared when the part is cleared (default).
1 = channel is cleared when the part is cleared.
Enables or disables the selected output channel.
0 = channel disabled (default).
1 = channel enabled.
Selects the internal current sense resistor or an external current sense resistor for the selected DAC channel.
0 = external resistor selected (default).
1 = internal resistor selected.
Powers up or powers down the dc-to-dc converter on the selected channel. All dc-to-dc converters can be powered up
simultaneously using the DCDC_ALL bit in the main control register. To power down the dc-to-dc converter, the OUTEN
and INT_ENABLE bits must also be set to 0.
0 = dc-to-dc converter is powered down (default).
1 = dc-to-dc converter is powered up.
Enables 20% overrange on the voltage output channel only. No current output overrange is available.
0 = overrange disabled (default).
1 = overrange enabled.
Selects the output range to be enabled.
R2
0
0
0
0
1
1
1
D12
X
1
D11
X
1
R1
0
0
1
1
0
0
1
D10
X
1
D9
X
1
R0
0
1
0
1
0
1
0
D8
INT_ENABLE CLR_EN OUTEN
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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
D6
D5
RSET
D4
DC_DC
D3
OVRNG R2
D2
D1
R1
AD5735
D0
R0