MCP47FVB01 datasheet(37/92 Pages) MICROCHIP

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DS20005405A-page 37

MCP47FVBXX

5.0

DAC CIRCUITRY

The Digital to Analog Converter circuitry converts a digital

value into its analog representation. The description

describes the functional operation of the device.

The DAC Circuit uses a resistor ladder implementation.

Devices have up to two DACs.

Figure 5-1 shows the functional block diagram for the

MCP47FVBXX DAC circuitry.

The functional blocks of the DAC include:

• Resistor Ladder

• Voltage Reference Selection

• Output Buffer/V

OUT Operation

• Internal Band Gap (as a voltage reference)

• Latch Pin (LAT)

• Power-Down Operation

FIGURE 5-1:

MCP47FVBXX DAC Module Block Diagram.

RS(2)

VREF

DAC

Output

RS(1)

RS(2n - 1)

RS(2n - 2)

RS(2n - 3)

RS(2n)

VDD

VRL

Gain

(1x or 2x)

VOUT

PD1:PD0

VDD

PD1:PD0

VDD

PD1:PD0 and

PD1:PD0

VREF1:VREF0

RRL

(~140 k

)

Band Gap

(1.22V typical)

VDD

VREF1:VREF0

PD1:PD0 and BGEN

Selection

Internal Band Gap

Voltage

Reference

Selection

Resistor

Ladder

Output Buffer/VOUT

Operation

Power-Down

Operation

Power-Down

Operation

Power-Down

Operation

A (RL)

VREF1:VREF0

Where:

# Resistors in Resistor Ladder = 256 (MCP47FVB0X)

1024 (MCP47FVB1X)

4096 (MCP47FVB2X)

DAC Register Value

# Resistor in Resistor Ladder

----------------------------------------------------------------------V



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