AD5320 Analog Devices, AD5320 Datasheet - Page 13
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AD5320
Manufacturer Part Number
AD5320
Description
Manufacturer
Analog Devices
Datasheet
1.AD5320.pdf
(20 pages)
Specifications of AD5320
Resolution (bits)
12bit
Dac Update Rate
125kSPS
Dac Settling Time
8µs
Max Pos Supply (v)
+5.5V
Single-supply
Yes
Dac Type
Voltage Out
Dac Input Format
Ser,SPI
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POWER-DOWN MODES
The AD5320 contains four separate modes of operation. These
modes are software-programmable by setting two bits (DB13
and DB12) in the control register. Table 5 shows how the state
of the bits corresponds to the mode of operation of the device.
Table 5. Modes of Operation for the AD5320
DB13
0
0
1
1
When both bits are set to 0, the part works with its normal power
consumption of 140 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 fall, but the output stage is also inter-
nally switched from the output of the amplifier to a resistor net-
work of known values. This has the advantage that the output
impedance of the part is known while the part is in power-down
mode. There are three different options: 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 it is left open-
circuited (three-state). The output stage is illustrated in Figure 27.
DB12
0
1
0
1
Operating Mode
Normal Operation
Power-Down Modes
1 kΩ to GND
100 kΩ to GND
Three-State
Rev. C | Page 13 of 20
The bias generator, output amplifier, resistor string, and other
associated linear circuitry are shut down when the power-down
mode is activated. However, the contents of the DAC register
are unaffected when in power-down. The time to exit power-
down is typically 2.5 μs for V
(see Figure 21).
STRING DAC
RESISTOR
Figure 27. Output Stage During Power-Down
POWER-DOWN
CIRCUITRY
AMPLIFIER
DD
= 5 V and 5 μs for V
RESISTOR
NETWORK
V
OUT
AD5320
DD
= 3 V