MCP47CMB02 datasheet(59/124 Pages) MICROCHIP

59 / 124 page

 2018-2019 Microchip Technology Inc.

DS20006089B-page 59

MCP47CXBXX

5.0

DAC CIRCUITRY

The Digital-to-Analog Converter circuitry converts a

digital value into its analog representation. This

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 MCP47CXBXX DAC

circuitry.

The functional blocks of the DAC include:

• Resistor Ladder

• Voltage Reference Selection

• Output Buffer/VOUT Operation

• Latch Pin (LAT)

• Power-Down Operation

FIGURE 5-1:

MCP47CXBXX DAC Module Block Diagram.

RS(2)

VREF

DAC

Output

RS(1)

RS(2n – 1)

RS(2n – 2)

RS(2n – 3)

RS(2n)

VDD

VRL

VOUT

PD1:PD0

VDD

PD1:PD0

VDD

Band Gap

(1.214V typical)

VREF1:VREF0

and PD1:PD0

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 (MCP47CXB0X)

1024 (MCP47CXB1X)

4096 (MCP47CXB2X)

DAC Register Value

# Resistor in Resistor Ladder

----------------------------------------------------------------------VRL



VDD

(~71 k

)

RRL

Gain

(1x or 2x)

PD1:PD0 and

VREF1:VREF0

MCP47CMB02 Datasheet(PDF) 59 Page - Microchip Technology

MCP47CMB02 Datasheet(HTML) 59 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL