AD5757ACPZ datasheet(24/44 Pages) AD

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AD5757

Rev. A | Page 24 of 44

REGISTERS

Table 6 shows an overview of the registers for the AD5757.

Table 6. Data, Control, and Readback Registers for the AD5757

Description

Data

DAC Data Register (×4)

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.

Gain Register (×4)

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.

Offset Register (×4)

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.

Clear Code Register (×4)

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.

Control

Main Control Register

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.

Software Register

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.

Slew Rate Control Register (×4)

Used to program the slew rate of the output. There are four slew rate control registers, one per

channel.

DAC Control Register (×4)

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.

DC-to-DC Control Register

Use to set the dc-to-dc control parameters. Can control dc-to-dc maximum voltage, phase, and

frequency.

Readback

Status Register

This contains any fault information, as well as a user toggle bit.

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