Document
MCP4801/4811/4821
8/10/12-Bit Voltage Output Digital-to-Analog Converter with Internal VREF and SPI Interface
Features
• MCP4801: 8-Bit Voltage Output DAC • MCP4811: 10-Bit Voltage Output DAC • MCP4821: 12-Bit Voltage Output DAC • Rail-to-Rail Output • SPI Interface with 20 MHz Clock Support • Simultaneous Latching of the DAC Output
with LDAC Pin • Fast Settling Time of 4.5 µs • Selectable Unity or 2x Gain Output • 2.048V Internal Voltage Reference • 50 ppm/°C VREF 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 Channel
Voltage Reference
(VREF)
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 MCP4801/4811/4821 devices are single channel 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 an SPI compatible Serial Peripheral Interface.
The devices have a high precision internal voltage reference (VREF = 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).
The devices can be operated in Active or Shutdown mode by setting a Configuration register bit or using the SHDN pin. In Shutdown mode, most of the internal circuits, including the output amplifier, are turned off for power savings, while the amplifier output (VOUT) stage is configured to present a known high resistance output load (500 k typical.
The devices include double-buffered registers, allowing a synchronous update of the DAC output using the LDAC pin. These devices also incorporate a Power-on Reset (POR) circuit to ensure reliable powerup.
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 MCP4801/4811/4821 devices are available in the PDIP, SOIC, MSOP and DFN packages.
2010 Microchip Technology Inc.
DS22244B-page 1
MCP4801/4811/4821
Package Types
PDIP, SOIC, MSOP
VDD 1 CS 2 SCK 3 SDI 4
MCP48X1
8 VOUT 7 VSS 6 SHDN 5 LDAC
DFN (2x3)*
VDD 1
8 VOUT
CS 2
7 VSS
9
SCK 3
6 SHDN
SDI 4
5 LDAC
MCP4801: 8-bit single DAC MCP4811: 10-bit single DAC MCP4821: 12-bit single DAC
* Includes Exposed Thermal Pad (EP); see Table 3-1.
Block Diagram
LDAC CS SDI SCK
Interface Logic
Input Register
Power-on
VDD
Reset
VSS
DAC Register
VREF (2.048V)
String DAC
Output Op Amp
Output Logic
Gain Logic
SHDN VOUT
DS22244B-page 2
2010 Microchip Technology Inc.
MCP4801/4811/4821
1.0 ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings †
VDD ............................................................................................................. 6.5V All inputs and outputs .....................VSS – 0.3V to VDD + 0.3V Current at Input Pins ....................................................±2 mA Current at Supply Pins ...............................................±50 mA Current at Output Pins ...............................................±25 mA Storage temperature .....................................-65°C to +150°C Ambient temp. with power applied ................-55°C to +125°C ESD protection on all pins 4 kV (HBM), 400V (MM) Maximum Junction Temperature (TJ) . .........................+150°C
† Notice: Stresses above those listed under “Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operational listings of this specification is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
Electrical Specifications: Unless otherwise indicated, VDD = 5V, VSS = 0V, VREF = 2.048V, Output Buffer Gain (G) = 2x, RL = 5 k to GND, CL = 100 pF, TA = -40 to +85°C. Typical values are at +25°C.
Parameters
Sym
Min
Typ
Max Units
Conditions
Power Requirements Operating Voltage Operating Current
VDD
2.7
—
5.5
IDD
—
330
400
Hardware Shutdown Current Software Shutdown .