MCP4921 datasheet(21/50 Pages) MICROCHIP

Part #	MCP4921

Description	8/10/12-Bit Voltage Output Digital-to-Analog Converter with SPI Interface

PDF	50 Pages

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Manufacturer	MICROCHIP [Microchip Technology]

Direct Link	http://www.microchip.com

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21 / 50 page

 2010 Microchip Technology Inc.

DS22248A-page 21

MCP4901/4911/4921

4.2.4

SHUTDOWN MODE

The user can shut down the device by using a software

command. During Shutdown mode, most of the internal

circuits, including the output amplifier, are turned off for

power savings. The serial interface remains active,

thus allowing a write command to bring the device out

of Shutdown mode. There will be no analog output at

the VOUT pin, and the VOUT pin is internally switched to

a known resistive load (500 k

 typical. Figure 4-4

shows the analog output stage during Shutdown mode.

The device will remain in Shutdown mode until it

receives a write command with <SHDN> bit = 1 and the

bit is latched into the device. When the device 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

Amp

Resistive String DAC

MCP4921 Datasheet(PDF) 21 Page - Microchip Technology