Microchip MCP4922 Handleiding

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 2010 Microchip Technology Inc.DS22250A-page 1

MCP4902/4912/4922

Features

•MCP4902: Dual 8-Bit Voltage Output DAC

•MCP4912: Dual 10-Bit Voltage Output DAC

•MCP4922: Dual 12-Bit Voltage Output DAC

•Rail-to-Rail Output

•SPI Interface with 20 MHz Clock Support

•Simultaneous Latching of the Dual DACs

with LDAC pin

•Fast Settling Time of 4.5 µs

•Selectable Unity or 2x Gain Output

•External Voltage Reference Inputs

•External Multiplier Mode

•2.7V to 5.5V Single-Supply Operation

•Extended Temperature Range:-40°C to +125°C

Applications

•Set Point or Offset Trimming

•Precision Selectable Voltage Reference

•Motor Control Feedback Loop

•Digitally-Controlled Multiplier/Divider

•Calibration of Optical Communication Devices

Related Products(1)

Description

The MCP4902/4912/4922 devices are dual 8-bit,

10-bit, and 12-bit buffered voltage output

Digital-to-Analog Converters (DACs), respectively. The

devices operate from a single 2.7V to 5.5V supply with

SPI compatible Serial Peripheral Interface. The user

can configure the full-scale range of the device to be

VREFor 2 * VREFby setting the Gain Selection Option

bit (gain of 1 of 2).

The user can shut down both DAC channels by using

SHDN pin or shut down the DAC channel individually

by setting the Configuration register bits. In Shutdown

mode, most of the internal circuits in the shutdown

channel are turned off for power savings and the output

amplifier is configured to present a known high

resistance output load (500 ktypical.

The devices include double-buffered registers,

allowing synchronous updates of two DAC outputs,

using the LDAC pin. These devices also incorporate a

Power-on Reset (POR) circuit to ensure reliable power-

up.

The devices utilize a resistive string architecture, with

its inherent advantages of low DNL error and fast

settling time. These devices are specified over the

extended temperature range (+125°C).

The devices provide high accuracy and low noise

performance for consumer and industrial applications

where calibration or compensation of signals (such as

temperature, pressure and humidity) are required.

The MCP4902/4912/4922 devices are available in the

PDIP, SOIC and TSSOP packages.

Package Types

P/N DAC

Resolution

No. of

ChannelS

Voltage

Reference

(VREF)

MCP4801 81

Internal

(2.048V)

MCP4811 101

MCP4821 121

MCP4802 82

MCP4812 102

MCP4822 122

MCP4901 81

External

MCP4911 101

MCP4921 121

MCP4902 82

MCP4912 102

MCP4922 122

Note 1:The products listed here have similar AC/

DC performances.

MCP4902: 8-bit dual DAC

MCP4912: 10-bit dual DAC

MCP4922: 12-bit dual DAC

141

2

3

4

13

12

11

10

9

8

5

6

7

14-Pin PDIP, SOIC, TSSOP

VDD

NC

CS

SCK V

REFB

NC

NC

SDI

LDAC

SHDN

V

OUTB

V

OUTA

V

REFA

V

SS

MCP49X2

8/10/12-Bit Dual Voltage Output Digital-to-Analog Converter

with SPI Interface

Product specificaties