MCP48FVB18 datasheet(2/112 Pages) MICROCHIP

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MCP48FXBX4/8

DS20006362A-page 2

 2020 Microchip Technology Inc.

General Description

The MCP48FXBX4/8 devices are a family of buffered

voltage output Digital-to-Analog Converters (DAC),

with the following options:

• Quad or octal output channel configurations

• 8/10/12-bit resolution

• Volatile or nonvolatile user memory

The quad and octal options differ only by the number of

output channels. The volatile and nonvolatile versions

have an identical analog circuit structure.

There are three voltage reference sources: the external

VREF pin, the device’s VDD or an internal band gap

voltage source.

When the VDD mode is selected, it is internally con-

nected to the DAC’s reference circuit. When the external

VREF pin is used, the user has the option to select

between a gain of 1 and 2 if the Buffered mode is used,

or the internal buffer can be bypassed entirely in the

External VREF Unbuffered mode.

In the Internal Band Gap Voltage Reference mode, the

gain can be selected between 2 and 4.

This

family

devices

features

WiperLock™

functionality, which prevents inadvertent changes of

the output value. It uses a high voltage on a specific

pin, together with dedicated commands, to lock the

values that are stored in memory.

These devices have an SPI compatible serial interface.

WRITE commands are supported up to 20 MHz, while

READ commands are supported up to 10 MHz.

Applications

• Set Point or Offset Trimming

• Sensor Calibration

• Low-Power Portable Instrumentation

• PC Peripherals

• Data Acquisition Systems

• Motor Control

MCP48FXBX4/8 DAC Output Channel Block Diagram

VREF

Band Gap

VDD

LAT

VDD

PDnB:PDnA

VRnB:VRnA

PDnB:PDnA

1kΩ

125 kΩ

VOUT

VRnB:VRnA/PDnB:PDnA

–

GAIN

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