ADR435 datasheet(13/48 Pages) AD

13 / 48 page

Data Sheet

AD5735

Rev. B | Page 13 of 48

Pin No.

Mnemonic

Description

ALERT

Active High Output. This pin is asserted when there is no SPI activity on the interface pins for a preset time.

For more information, see the Alert Output section.

FAULT

Active Low, Open-Drain Output. This pin is asserted low when any of the following conditions is detected:

open circuit in current mode; short circuit in voltage mode; PEC error; or an overtemperature condition (see

the Fault Output section).

POC

Power-On Condition. This pin determines the power-on condition and is read during power-on and after a

device reset. If POC = 0, the device is powered up with the voltage and current channels in tristate mode. If

POC = 1, the device is powered up with a 30 kΩ pull-down resistor to ground on the voltage output channel,

and the current channel is in tristate mode.

RESET

Hardware Reset, Active Low Input.

AVDD

Positive Analog Supply Pin. The voltage range is from 9 V to 33 V.

COMPLV_A

Optional Compensation Capacitor Connection for VOUT_A Output Buffer. Connecting a 220 pF capacitor

between this pin and the VOUT_A pin allows the voltage output to drive up to 2 µF. Note that the addition

of this capacitor reduces the bandwidth of the output amplifier, increasing the settling time.

−VSENSE_A

Sense Connection for the Negative Voltage Output Load Connection for VOUT_A. This pin must stay within

±3.0 V of AGND for specified operation.

+VSENSE_A

Sense Connection for the Positive Voltage Output Load Connection for VOUT_A. The difference in voltage

between this pin and the VOUT_A pin is added directly to the headroom requirement.

COMPDCDC_A

DC-to-DC Compensation Capacitor. Connect a 10 nF capacitor from this pin to ground. Used to regulate the

feedback loop of the Channel A dc-to-dc converter. Alternatively, if using an external compensation resistor,

place a resistor in series with a capacitor to ground from this pin. For more information, see the DC-to-DC

Converter Compensation Capacitors section and the AICC Supply Requirements—Slewing section.

VBOOST_A

Supply for Channel A Current Output Stage (see Figure 71). This pin is also the supply for the VOUT_A stage,

which is regulated to 15 V by the dc-to-dc converter. To use the dc-to-dc converter, connect this pin as

shown in Figure 77.

VOUT_A

Buffered Analog Output Voltage for DAC Channel A.

IOUT_A

Current Output Pin for DAC Channel A.

AVSS

Negative Analog Supply Pin. The voltage range is from −10.8 V to −26.4 V.

COMPLV_B

Optional Compensation Capacitor Connection for VOUT_B Output Buffer. Connecting a 220 pF capacitor

between this pin and the VOUT_B pin allows the voltage output to drive up to 2 µF. Note that the addition

of this capacitor reduces the bandwidth of the output amplifier, increasing the settling time.

−VSENSE_B

Sense Connection for the Negative Voltage Output Load Connection for VOUT_B. This pin must stay within

±3.0 V of AGND for specified operation.

+VSENSE_B

Sense Connection for the Positive Voltage Output Load Connection for VOUT_B. The difference in voltage

between this pin and the VOUT_B pin is added directly to the headroom requirement.

VOUT_B

Buffered Analog Output Voltage for DAC Channel B.

COMPDCDC_B

DC-to-DC Compensation Capacitor. Connect a 10 nF capacitor from this pin to ground. Used to regulate the

feedback loop of the Channel B dc-to-dc converter. Alternatively, if using an external compensation resistor,

place a resistor in series with a capacitor to ground from this pin. For more information, see the DC-to-DC

Converter Compensation Capacitors section and the AICC Supply Requirements—Slewing section.

IOUT_B

Current Output Pin for DAC Channel B.

VBOOST_B

Supply for Channel B Current Output Stage (see Figure 71). This pin is also the supply for the VOUT_B stage,

which is regulated to 15 V by the dc-to-dc converter. To use the dc-to-dc converter, connect this pin as

shown in Figure 77.

AGND

Ground Reference Point for Analog Circuitry. This pin must be connected to 0 V.

SWB

Switching Output for Channel B DC-to-DC Circuitry. To use the dc-to-dc converter, connect this pin as

shown in Figure 77.

GNDSWB

Ground Connection for DC-to-DC Switching Circuit. This pin should always be connected to ground.

GNDSWA

Ground Connection for DC-to-DC Switching Circuit. This pin should always be connected to ground.

SWA

Switching Output for Channel A DC-to-DC Circuitry. To use the dc-to-dc converter, connect this pin as

shown in Figure 77.

AVSS

Negative Analog Supply Pin. The voltage range is from −10.8 V to −26.4 V.

SWD

Switching Output for Channel D DC-to-DC Circuitry. To use the dc-to-dc converter, connect this pin as

shown in Figure 77.

GNDSWD

Ground Connection for DC-to-DC Switching Circuit. This pin should always be connected to ground.

GNDSWC

Ground Connection for DC-to-DC Switching Circuit. This pin should always be connected to ground.

SWC

Switching Output for Channel C DC-to-DC Circuitry. To use the dc-to-dc converter, connect this pin as

shown in Figure 77.

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