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MCP48FVB21 数据表(PDF) 37 Page - Microchip Technology

部件名 MCP48FVB21
功能描述  8-/10-/12-Bit Single/Dual Voltage Output Volatile Digital-to-Analog Converters with SPI Interface
PDF  84 Pages
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制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

MCP48FVB21 数据表(HTML) 37 Page - Microchip Technology

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 2015 Microchip Technology Inc.
DS20005466A-page 37
MCP48FVBXX
5.0
DAC CIRCUITRY
The Digital-to-Analog Converter circuitry converts a
digital value into its analog representation. The
description details 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
MCP48FVBXX DAC circuitry.
The functional blocks of the DAC include:
• Resistor Ladder
• Voltage Reference Selection
• Output Buffer/VOUT Operation
• Internal Band Gap (as a voltage reference)
•Latch Pin (LAT)
• Power-Down Operation
FIGURE 5-1:
MCP48FVBXX 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
VW
RRL
(~140 k
)
Band Gap
(1.22V typical)
VDD
VREF1:VREF0
PD1:PD0 and BGEN
Selection
Internal Band Gap
Voltage
Reference
Selection
Resistor
Ladder
Power-Down
Operation
Power-Down
Operation
Power-Down
Operation
A (RL)
B
VREF1:VREF0
Where:
# of Resistors in Resistor Ladder =
256 (MCP48FVB0X)
= 1024 (MCP48FVB1X)
= 4096 (MCP48FVB2X)
V
W
DAC Register Value
# of Resistors in Resistor Ladder
------------------------------------------------------------------------------
V
RL
=
Output
Buffer/VOUT
Operation



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