Datasheet MCP47FXBX4/8 (Microchip) - 2

MCP47FXBX4/8
General Description
The MCP47FXBX4/8 devices are a family of buffered
voltage output Digital-to-Analog Converters (DAC),
with the following options:
• quad or octal output channel configurations
• 8/10/12-bit resolution
• Volatile or nonvolatile user memory
The quad and octal options differ only by the number of
output channels. The volatile and nonvolatile versions
have an identical analog circuit structure.
There are three voltage reference sources: the external
VREF pin, the device’s VDD or an internal band gap voltage source.
When the VDD mode is selected, it is internally connected to the DAC’s reference circuit. When the external VREF pin is used, the user has the option to select
between a gain of 1 and 2 if the Buffered mode is used,
or the internal buffer can be bypassed entirely in the
external VREF Unbuffered mode. This family of devices features WiperLock™
functionality, which prevents inadvertent changes of
the output value. It uses a high voltage on a specific
pin, with dedicated commands, to lock the values that
are stored in memory.
The MCP47FXBX4/8 devices communicate with the
host controller using an I2C compatible interface, supporting the following data transfer rates: Standard (100
kHz), Fast (400 kHz) and High-Speed (1.7 MHz and
3.4 MHz). They can only function as slave devices. Applications
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• Set Point or Offset Trimming
Sensor Calibration
Low-Power Portable Instrumentation
PC Peripherals
Data Acquisition Systems
Motor Control In the internal band gap voltage reference mode, the
gain can be selected between 2 and 4. MCP47FXBX4/8 DAC Output Channel Block Diagram
VDD
VRnB:VRnA/PDnB:PDnA PDnB:PDnA VREF
PDnB:PDnA
VRnB:VRnA VRnB:VRnA
LAT DS20006368A-page 2 VOUT GAIN Ladder VDD Resistor Band Gap PDnB:PDnA 1 kΩ 125 kΩ  2020 Microchip Technology Inc.