MCP4902T-E/P MICROCHIP [Microchip Technology], MCP4902T-E/P Datasheet - Page 21

• Manufacturer Part Number: MCP4902T-E/P
• Description: 8/10/12-Bit Dual Voltage Output Digital-to-Analog Converter with SPI Interface
• Manufacturer: MICROCHIP [Microchip Technology]

4.2.4
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 V
resistive load (500 k typical.
analog output stage during the Shutdown mode.
The condition of the Power-on Reset circuit during the
shutdown is as follows:
a)
b)
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).
 2010 Microchip Technology Inc.
Turned-off, if the shutdown occurred by the
SHDN pin;
On, if the shutdown occurred by the software.
OUT
SHUTDOWN MODE
pin is internally switched to a known
Figure 4-4
shows the
FIGURE 4-4:
Mode.
MCP4902/4912/4922
Resistive String DAC
Op
Amp
Control Circuit
Power-Down
Output Stage for Shutdown
Resistive
Load
DS22250A-page 21
500 k
V
OUT