MCP4821 Datasheet, PDF (1/36 Pages) Microchip Technology – 12-Bit DACs with Internal VREF and SPI™ Interface

MCP4821/MCP4822
12-Bit DACs with Internal V_REF and SPI™ Interface
Features
• 12-Bit Resolution
• ±0.2 LSb DNL (typ.)
• ±2 LSb INL (typ.)
• Single or Dual Channel
• 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 Band Gap 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
Block Diagram
CS SDI SCK LDAC
Interface Logic
Input
Input
Register A Register B
DAC_A
Register
DAC_B
Register
Power-on
Reset
V_DD
AV_SS
2.048V
V_REF
String
DAC_A
String
DAC_B
Gain
Logic
Output
Op Amps
Output
Logic
Gain
Logic
V_OUTA
SHDN
V_OUTB
Description
The Microchip Technology Inc. MCP482X devices are
2.7V–5.5V, low-power, low DNL, 12-bit Digital-to-Analog
Converters (DACs) with internal band gap voltage
reference, optional 2x-buffered output and Serial
Peripheral Interface (SPI™).
The MCP482X family of DACs provide high accuracy
and low noise performance for industrial applications
where calibration or compensation of signals (such as
temperature, pressure and humidity) are required.
The MCP482X devices are available in the extended
temperature range and PDIP, SOIC and MSOP
packages.
The MCP482X 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. The MCP482X family
includes double-buffered registers, allowing simulta-
neous updates using the LDAC pin. These devices also
incorporate a Power-On Reset (POR) circuit to ensure
reliable power-up.
Package Types
8-Pin PDIP, SOIC, MSOP
V_{DD 1}
8 V_OUTA
CS 2
SCK ³
7 AV_SS
6 SHDN
SDI 4
5 LDAC
8-Pin PDIP, SOIC, MSOP
V_{DD 1}
8 V_OUTA
CS 2
SCK ³
7 AV_SS
6 V_OUTB
SDI 4
5 LDAC
© 2005 Microchip Technology Inc.
DS21953A-page 1