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MCP48CMB02 Datasheet(PDF) 55 Page - Microchip Technology

Part # MCP48CMB02
Description  8/10/12-Bit Digital-to-Analog Converters, 1 LSb INL Single/Dual Voltage Outputs with SPI Interface
PDF  106 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP48CMB02 Datasheet(HTML) 55 Page - Microchip Technology

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 2019 Microchip Technology Inc.
DS20006160A-page 55
MCP48CXBXX
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 MCP48CXBXX 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:
MCP48CXBXX 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
VW
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)
B
VREF1:VREF0
Where:
# Resistors in Resistor Ladder = 256
(MCP48CXB0X)
1024 (MCP48CXB1X)
4096 (MCP48CXB2X)
VW
DAC Register Value
# Resistor in Resistor Ladder
----------------------------------------------------------------------VRL
=
VDD
(~71 k
)
R
RL
PD1:PD0 and
VREF1:VREF0



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