DAC8560A BURR-BROWN [Burr-Brown Corporation], DAC8560A Datasheet - Page 21

• Manufacturer Part Number: DAC8560A
• Manufacturer: BURR-BROWN [Burr-Brown Corporation]

POWER-DOWN MODES
The DAC8560 supports four separate modes of
operation. These modes are programmable by
setting two bits (PD1 and PD0) in the control
register.
mode with data bits PD1 (DB17) and PD0 (DB16).
When both bits are set to '0', the device works
normally with its typical current consumption of
530 A at 5.5V. However, for the three power-down
modes, the supply current falls to 1.2 A at 5.5V
(0.7 A at 3.6V). Not only does the supply current fall,
but the output stage is also internally switched from
the output of the amplifier to a resistor network of
known values.
(DB17)
PD1
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0
0
1
1
Table 5
(DB16)
PD0
0
1
0
1
Table 5. Operating Modes
shows how to control the operating
Normal operation
Power-down 1 k
Power-down 100 k
Power-down High-Z
OPERATING MODE
to GND
to GND
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The advantage of this switching is that the output
impedance of the device is known while it is in
power-down mode. As shown in
three different power-down options. V
connected internally to GND through a 1k
a 100k
output stage is illustrated in
All analog circuitry
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 s for V
Typical Characteristics
Figure 66. Output Stage During Power Down
Resistor
String
DAC
resistor, or open circuited (High-Z). The
DD
= 5V, and 5 s for V
Power-Down
Circuitry
Amplifier
for more information.
is
Figure
shut
SLAS464 – DECEMBER 2006
Table
down
66.
DD
Resistor
Network
= 3V. See the
OUT
5, there are
DAC8560
when
V
V
FB
OUT
resistor,
can be
the
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