AD5303 datasheet(19/28 Pages) AD

Part #	AD5303

Description	2.5 V to 5.5 V, 230 關A, Dual Rail-to-Rail Voltage Output 8-/10-/12-Bit DACs

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19 / 28 page

AD5303/AD5313/AD5323

Rev. B | Page 19 of 28

POWER-DOWN MODES

The AD5303/AD5313/AD5323 have very low power consump-

tion, dissipating only 0.7 mW with a 3 V supply and 1.5 mW

with a 5 V supply. Power consumption can be further reduced

when the DACs are not in use by putting them into one of three

power-down modes, which are selected by Bit 13 and Bit 12

(PD1 and PD0) of the control word. Table 7 shows how the

state of the bits corresponds to the mode of operation of that

particular DAC.

Table 7. PD1/PD0 Operating Modes

PD1

PD0

Operating Mode

0

Normal operation

0

1

Power-down (1 kΩ load to GND)

1

0

Power-down (100 kΩ load to GND)

1

Power-down (high impedance output)

When both bits are set to 0, the DACs work normally with their

normal power consumption of 300 μA at 5 V. However, for the

three power-down modes, the supply current falls to 200 nA at

5 V (50 nA at 3 V) when both DACs are powered down. Not

only does the supply current drop, but the output stage is also

internally switched from the output of the amplifier to a resistor

network of known values. This has the advantage that the

output impedance of the part is known while the part is in

power-down mode and provides a defined input condition

for whatever is connected to the output of the DAC amplifier.

There are three different power-down options. The output is

connected internally to GND through either a 1 kΩ resistor or

a 100 kΩ resistor, or it is left in a high impedance state (three-

state). The output stage is illustrated in Figure 34.

The bias generator, the output amplifier, the resistor string, and

all other associated linear circuitry are shut down when the

power-down mode is activated. However, the contents of the

registers are unaffected when in power-down. The time to exit

power-down is typically 2.5 μs for VDD = 5 V and 5 μs when

VDD = 3 V (see Figure 24 for a plot).

The software power-down modes programmed by PD0 and

PD1 are overridden by the PD pin. Taking this pin low puts

both DACs into power-down mode simultaneously and both

outputs are put into a high impedance state. If PD is not used,

it should be tied high.

RESISTOR

STRING DAC

AMPLIFIER

VOUT

POWER-DOWN

CIRCUITRY

RESISTOR

NETWORK

Figure 34. Output Stage During Power-Down

Similar Part No. - AD5303

Manufacturer	Part #	Datasheet	Description
Analog Devices	AD5303	227Kb / 18P	2.5 V to 5.5 V, 230 uA, Dual Rail-to-Rail Voltage Output 8-/10-/12-Bit DACs REV. 0
	AD5303	427Kb / 20P	2.5 V to 5.5 V, 500 uA, 2-Wire Interface Quad Voltage Output, 8-/10-/12-Bit DACs REV. F
	AD5303	359Kb / 20P	2.5 V to 5.5 V, 115 uA, Parallel Interface Single Voltage-Output 8-/10-/12-Bit DACs REV. 0
	AD5303	274Kb / 20P	2.5 V to 5.5 V, 230uA, Parallel Interface Dual Voltage-Output 8-/10-/12-Bit DACs REV. 0
	AD5303	324Kb / 20P	2.5 V to 5.5 V, 500 uA, Parallel Interface Quad Voltage-Output 8-/10-/12-Bit DACs REV. 0

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Similar Description - AD5303

Manufacturer	Part #	Datasheet	Description
Analog Devices	AD5302	1Mb / 24P	2.5 V to 5.5 V, 230 關A, Dual Rail-to-Rail, Voltage Output 8-/10-/12-Bit DACs REV. D
	AD5302	1Mb / 24P	2.5 V to 5.5 V, 230 A, Dual Rail-to-Rail, Voltage Output 8-/10-/12-Bit DACs REV. D
	AD5322	1Mb / 24P	2.5 V to 5.5 V, 230 A, Dual Rail-to-Rail, Voltage Output 8-/10-/12-Bit DACs REV. D
	AD5312	1Mb / 24P	2.5 V to 5.5 V, 230 A, Dual Rail-to-Rail, Voltage Output 8-/10-/12-Bit DACs REV. D
	AD5313	464Kb / 28P	2.5 V to 5.5 V, 230 A, Dual Rail-to-Rail Voltage Output 8-/10-/12-Bit DACs REV. B
	AD5323	464Kb / 28P	2.5 V to 5.5 V, 230 A, Dual Rail-to-Rail Voltage Output 8-/10-/12-Bit DACs REV. B
	AD5303	464Kb / 28P	2.5 V to 5.5 V, 230 A, Dual Rail-to-Rail Voltage Output 8-/10-/12-Bit DACs REV. B
	AD5302	207Kb / 16P	2.5 V to 5.5 V, 230 uA Dual Rail-to-Rail, Voltage Output 8-/10-/12-Bit DACs REV. 0
	AD5303	227Kb / 18P	2.5 V to 5.5 V, 230 uA, Dual Rail-to-Rail Voltage Output 8-/10-/12-Bit DACs REV. 0
	AD5332	327Kb / 20P	2.5 V to 5.5 V, 230 A, Parallel Interface Dual Voltage-Output 8-/10-/12-Bit DACs REV. 0

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AD5303 Datasheet(PDF) 19 Page - Analog Devices

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