MCP4802/4812/4822
8/10/12-Bit Dual Voltage Output Digital-to-Analog Converter
with Internal V
REF
and SPI Interface
Features
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MCP4802: Dual 8-Bit Voltage Output DAC
MCP4812: Dual 10-Bit Voltage Output DAC
MCP4822: 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
2.048V Internal Voltage Reference
50 ppm/°C V
REF
Temperature Coefficient
2.7V to 5.5V Single-Supply Operation
Extended Temperature Range: -40°C to +125°C
Description
The MCP4802/4812/4822 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 devices have a high precision internal voltage
reference (V
REF
= 2.048V). The user can configure the
full-scale range of the device to be 2.048V or 4.096V by
setting the Gain Selection Option bit (gain of 1 of 2).
Each DAC channel can be operated in Active or
Shutdown mode 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, low ratio
metric temperature coefficient 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 MCP4802/4812/4822 devices are available in the
PDIP, SOIC and MSOP packages.
Applications
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Set Point or Offset Trimming
Sensor Calibration
Precision Selectable Voltage Reference
Portable Instrumentation (Battery-Powered)
Calibration of Optical Communication Devices
Related Products
(1)
P/N
MCP4801
MCP4811
MCP4821
MCP4802
MCP4812
MCP4822
MCP4901
MCP4911
MCP4921
MCP4902
MCP4912
MCP4922
DAC
Resolution
8
10
12
8
10
12
8
10
12
8
10
12
No. of
Channels
1
1
1
2
2
2
1
1
1
2
2
2
External
Internal
(2.048V)
Voltage
Reference
(V
REF
)
Package Types
8-Pin PDIP, SOIC, MSOP
MCP48X2
V
DD
1
CS 2
SCK 3
SDI 4
8 V
OUTA
7 V
SS
6 V
OUTB
5 LDAC
MCP4802:
8-bit dual DAC
MCP4812:
10-bit dual DAC
MCP4822:
12-bit dual DAC
Note 1:
The products listed here have similar
AC/DC performances.
2010 Microchip Technology Inc.
DS22249A-page 1
MICROCHIP [ MICROCHIP TECHNOLOGY ]
