AD5757 Analog Devices, AD5757 Datasheet - Page 25

• Manufacturer Part Number: AD5757
• Description: Quad Channel, 16-Bit, Serial Input, 4-20mA Output DAC, Dynamic Power Control, HART Connectivity
• Manufacturer: Analog Devices

Specifications of AD5757

• Resolution (bits): 16bit
• Dac Update Rate: 60kSPS
• Dac Settling Time: 15µs
• Max Pos Supply (v): +33V
• Single-supply: No
• Dac Type: Current Out
• Dac Input Format: SPI

Data Sheet
REGISTERS
Table 6 shows an overview of the registers for the AD5757.
Table 6. Data, Control, and Readback Registers for the AD5757
Register
Data
Control
Readback
DAC Data Register (×4)
Gain Register (×4)
Offset Register (×4)
Clear Code Register (×4)
Main Control Register
Software Register
Slew Rate Control Register (×4)
DAC Control Register (×4)
DC-to-DC Control Register
Status Register
Description
Used to write a DAC code to each DAC channel. AD5757 data bits = D15 to D0. There are four DAC
data registers, one per DAC channel.
Used to program gain trim, on a per channel basis. AD5757 data bits = D15 to D0. There are four gain
registers, one per DAC channel.
Used to program offset trim, on a per channel basis. AD5757 data bits = D15 to D0. There are four
offset registers, one per DAC channel.
Used to program clear code on a per channel basis. AD5757 data bits = D15 to D0. There are four clear
code registers, one per DAC channel.
Used to configure the part for main operation. Sets functions such as status readback during write,
enables output on all channels simultaneously, powers on all dc-to-dc converter blocks
simultaneously, and enables and sets conditions of the watchdog timer. See the Device Features
section for more details.
Has three functions. Used to perform a reset, to toggle the user bit and, as part of the watchdog timer
feature, to verify correct data communication operation.
Used to program the slew rate of the output. There are four slew rate control registers, one per
channel.
These registers are used to control the following:
Set the output range, for example, 4 mA to 20 mA.
Set whether an internal/external sense resistor is used.
Enable/disable a channel for CLEAR.
Enable/disable internal circuitry on a per channel basis.
Enable/disable output on a per channel basis.
Power on dc-to-dc converters on a per channel basis.
There are four DAC control registers, one per DAC channel.
Use to set the dc-to-dc control parameters. Can control dc-to-dc maximum voltage, phase, and
frequency.
This contains any fault information, as well as a user toggle bit.
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AD5757