MCP4802 Datasheet, PDF (1/46 Pages) Microchip Technology – 8/10/12-Bit Dual Voltage Output Digital-to-Analog Converter with Internal VREF and SPI Interface

MCP4802/4812/4822
8/10/12-Bit Dual Voltage Output Digital-to-Analog Converter
with Internal V_REF and SPI Interface
Features
• 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
Applications
• 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
DAC
No. of
Resolution Channels
Voltage
Reference
(V_REF)
MCP4801
8
1
MCP4811
10
1
MCP4821
12
MCP4802
8
1
Internal
2
(2.048V)
MCP4812
10
2
MCP4822
12
2
MCP4901
8
1
MCP4911
10
1
MCP4921
12
MCP4902
8
1
External
2
MCP4912
10
2
MCP4922
12
2
Note 1: The products listed here have similar
AC/DC performances.
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.
Package Types
8-Pin PDIP, SOIC, MSOP
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
 2010 Microchip Technology Inc.
DS22249A-page 1