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Data Sheet

AD5710R

THEORY OF OPERATION

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Rev. 0 | 23 of 56

Table 9. Multiplexer Channels Options (Continued)

SEL Field

MUX_OUT

AGND

The corresponding full-scale output voltages for each monitored

channel are provided in Table 10.

Table 10. Full Scale Output Voltages

MUX_OUT Channel

Full Scale Output (V)

Current Monitor through RSENSE, CHx

PVDD

Voltage Monitor, CHx

VREF or 2 × VREF

Supply Voltage, PVDDx for CHx

PVDD

Die Temperature at 125°C

0.61

Voltage Monitor Channels

The transfer function of the integrated multiplexer, when voltage

output monitor channel is selected, is given by the following equa-

tions.

For VDAC mode with OUTPUT_CONTROL_0, Bit 2 (range) = 0

VMEAS=MUX_OUT

(4)

For VDAC mode with OUTPUT_CONTROL_0, Bit 2 (range) = 1

VMEAS=2×MUX_OUT

(5)

where:

VMEAS is the measured voltage output of the selected channel.

MUX_OUT is the voltage output on the MUX_OUT pin in volts.

A voltage output of VREF represents the full scale range of the

DAC channel being monitored regardless of the OUTPUT_CON-

TROL_0, Bit 2 (range) value.

Current Monitor Channels

When the MUX_OUT pin is configured to monitor the current of the

OUTx channel, the transfer function depends on the value of the

sense resistor (RSENSE). The relationship is typically expressed as

the following equation:

IOUTX=PVDDx−MUX_OUTV

RSENSE

(6)

where:

MUX_OUT is the voltage at the MUX_OUT pin in volts.

PVDDx is the supply voltage.

RSENSE is the internal sense resistor, with value of 1.84Ω ±10%

nominal tolerance.

PVDDₓ can be measured directly at the supply pin or using the

MUX_OUT function. Using the known value of the internal sense

resistor RSENSE and the measured MUX_OUT voltage, the output

current IOUTₓ can be calculated using Equation 6.

Die Temperature Monitor

The internal die temperature can also be monitored through the

MUX_OUT pin by setting the SEL bits to 0x19. The transfer function

used to derive the measured temperature is given by the following

equation:

TMEAS=MUX_OUTV−0.434V

1.774mV/°C

+25°C

(7)

where:

TMEAS is the measured internal die temperature in °C.

MUX_OUT is the voltage at the MUX_OUT pin in volts.

Supply Voltages Monitor

The supplies PVDD0 and PVDD1 can be monitored through the

MUX_OUT pin by setting the corresponding SEL bits. The transfer

function is given by the following equation:

VPVDDX=MUX_OUT

(8)

where MUX_OUT is the voltage output on the MUX_OUT pin in

volts.

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