AD5312BRMZ Analog Devices Inc, AD5312BRMZ Datasheet - Page 16

• Manufacturer Part Number: AD5312BRMZ
• Description: IC DAC 10BIT DUAL R-R 10-MSOP
• Manufacturer: Analog Devices Inc

Specifications of AD5312BRMZ

• Data Interface: Serial
• Settling Time: 6µs
• Number Of Bits: 10
• Number Of Converters: 2
• Voltage Supply Source: Single Supply
• Power Dissipation (max): 2.5mW
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 10-MSOP, Micro10™, 10-uMAX, 10-uSOP
• Resolution (bits): 10bit
• Sampling Rate: 143kSPS
• Input Channel Type: Serial
• Supply Voltage Range - Analog: 2.5V To 5.5V
• Supply Current: 300µA
• Digital Ic Case Style: SOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AD5302/AD5312/AD5322
POWER-DOWN MODES
The AD5302/AD5312/AD5322 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
0
0
1
1
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). 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 options.
PDO
0
1
0
1
Operating Mode
Normal Operation
Power-Down (1 kΩ Load to GND)
Power-Down (100 kΩ Load to GND)
Power-Down (High Impedance Output)
Rev. C | Page 16 of 24
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The output stage is illustrated in Figure 33.
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 V
V
DD
= 3 V. See Figure 23 for a plot.
The output is connected internally to GND through a
1 kΩ resistor,
The output is connected internally to GND through a
100 kΩ resistor, or
The output is left open-circuited (three-state).
STRING DAC
RESISTOR-
Figure 33. Output Stage During Power-Down
POWER-DOWN
CIRCUITRY
AMPLIFIER
DD
= 5 V and 5 μs when
RESISTOR
NETWORK
V
OUT