AD5755 datasheet(18/34 Pages) AD

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AD5755/AD5735

Preliminary Technical Data

Rev. PrG | Page 18 of 34

REGISTERS

Table 8 below shows an overview of the Registers for the AD5755/AD5735.

Table 8. Data and Control Registers for AD5755/AD5735

DATA REGISTERS

Description

DAC Data Register (X4)

Used to write a DAC code to each DAC channel. AD5755 Data bits (D15 to D0),

AD5735 Data Bits (D15 to D4).

There are four DAC Data Registers, one per DAC Channel.

Gain Register (X4)

Used to program gain trim on per channel basis. AD5755 Data bits (D15 to D0),

AD5735 Data Bits (D15 to D4).

There are four Gain Registers, one per DAC channel.

Offset Register (X4)

Used to program offset trim, on per channel basis. AD5755 Data bits (D15 to D0),

AD5735 Data Bits (D15 to D4).

There are four Offset Registers, one per DAC channel.

Clear Code Register (X4)

Used to program Clear Code on per channel basis. AD5755 Data bits (D15 to D0),

AD5735 Data Bits (D15 to D4).

There are four Clear Code Registers, one per DAC channel.

CONTROL REGISTERS

Main Control Register

Used to Configure the part for main operation. Sets functions such as status

readback during write, enable output on all channels simultaneously, power on all

DC-DC blocks simultaneously, enables and sets conditions of watchdog timer. See

Features Section for more details.

Software Register

Has two functions. Used to perform a reset. Is also used as part of the watchdog

timer feature to verify correct data communication operation.

Slew Rate Control Register (X4)

Use to program the slew rate of the output.

There are four Slew Rate Control Registers, one per channel.

DAC Control Register (X4)

These registers are used to control the following…

Set the output range, e.g. 4-20ma, 0-10v etc..

Set whether Internal/External sense Resistor used

Enable/Disable channel for CLEAR..

Enable/Disable Over-range.

Enable/Disable output on a per channel basis..

Power on DC-DC on a per channel basis.

There are four DAC Control Registers, one per DAC channel.

DC-DC Control Register

Use to set the DC-DC Control parameters. Can control DC-DC max voltage, phase

and frequency.

READBACK

Status Register

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