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MCP4902-E/ST bảng dữ liệu(PDF) 21 Page - Microchip Technology

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 2010 Microchip Technology Inc.
DS22250A-page 21
MCP4902/4912/4922
4.2.4
SHUTDOWN MODE
The user can shut down each DAC channel selectively
by using a software command or shut down all chan-
nels by using the SHDN pin. During Shutdown mode,
most of the internal circuits in the channel that was shut
down are turned off for power savings. The serial inter-
face remains active, thus allowing a write command to
bring the device out of the Shutdown mode. There will
be no analog output at the channel that was shut down
and the VOUT pin is internally switched to a known
resistive load (500 k
typical. Figure 4-4 shows the
analog output stage during the Shutdown mode.
The condition of the Power-on Reset circuit during the
shutdown is as follows:
a)
Turned-off, if the shutdown occurred by the
SHDN pin;
b)
On, if the shutdown occurred by the software.
The device will remain in Shutdown mode until the
SHDN pin is brought to high or a write command with
<SHDN> bit = 1 is latched into the device. When a DAC
is changed from Shutdown to Active mode, the output
settling time takes less than 10 µs, but more than the
standard active mode settling time (4.5 µs).
FIGURE 4-4:
Output Stage for Shutdown
Mode.
500 k
Power-Down
Control Circuit
Resistive
Load
VOUT
Op
Amp
Resistive String DAC



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