AD5750 datasheet(21/25 Pages) AD

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Preliminary Technical Data

AD5750

Rev. PrC | Page 21 of 25

In hardware mode there is no status register. The fault

conditions; open circuit, short circuit and over temperature are

available on pins IFAULT, VFAULT and TEMP. If any one of

these fault conditions are set then a low is asserted on the

specific fault pin. IFAULT, VFAULT and TEMP are open drain

outputs and therefore can be connected together to allow the

user generate one interrupt to the system controller to

communicate a fault. If hardwired in this way, it will not be

possible to isolate which fault occurred in the system.

DEFAULT CONFIGURATION:

On initial power-up of the AD5750 the power-on-reset circuit

ensures that all registers are loaded with zero-code, as such the

default output is the current output with the 4mA to 20mA

range selected, the current output until a value is programmed

is 0mA. The voltage output pin will be in three-state. An

alternative current range or a voltage output range may be

selected via the CONTROL register.

TRANSFER FUNCTION

Voltage Output

For a unipolar voltage output range, the output voltage

expression is given by

Vout = GAIN x VIN

For a bipolar voltage output range, the output voltage expression is

given by

Vout = (GAIN x VIN – (GAIN x (VREF/2)) x VIN)

where:

VREF is the reference voltage applied at the REFIN pin.

Gain is an internal gain whose value depends on the output

range selected by the user as shown in

Current Output

For a given current output range, the current output range is

chosen setting the bits R3,R2,R1,R10 in the Input Register or

pins. Transfer function will change depending on current range

selected.

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