MCP4821-E/SN Microchip Technology, MCP4821-E/SN Datasheet - Page 15

• Manufacturer Part Number: MCP4821-E/SN
• Description: IC DAC 12BIT W/SPI 8SOIC
• Manufacturer: Microchip Technology

Specifications of MCP4821-E/SN

• Number Of Converters: 1
• Package / Case: 8-SOIC (3.9mm Width)
• Settling Time: 4.5µs
• Number Of Bits: 12
• Data Interface: Serial, SPI™
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Resolution: 12 bit
• Interface Type: Serial (3-Wire, SPI, Microwire)
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.7 V
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power Dissipation (max): -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

4.0
The MCP482X devices are voltage-output string DACs.
These devices include rail-to-rail output amplifiers,
internal voltage reference, shutdown and reset-man-
agement circuitry. Serial communication conforms to
the SPI protocol. The MCP482X devices operate from
2.7V to 5.5V supplies.
The coding of these devices is straight binary, with the
ideal output voltage given by Equation 4-1, where G is
the selected gain (1x or 2x), D
input value and n represents the number of bits of
resolution (n = 12).
EQUATION 4-1:
1 LSb is the ideal voltage difference between two
successive codes. Table 4-1 illustrates how to calculate
LSb.
TABLE 4-1:
4.0.1
INL error for these devices is the maximum deviation
between an actual code transition point and its corre-
sponding ideal transition point once offset and gain
errors have been removed. These endpoints are from
0x000 to 0xFFF. Refer to Figure 4-1.
Positive INL represents transition(s) later than ideal.
Negative INL represents transition(s) earlier than ideal.
© 2005 Microchip Technology Inc.
MCP482X
MCP482X
Device
GENERAL OVERVIEW
INL ACCURACY
V
OUT
LSb SIZES
=
Gain
LSb SIZE
1x
2x
2.048V G D
------------------------------------- -
2
N
n
represents the digital
2.048V/4096
4.096V/4096
N
LSb Size
FIGURE 4-1:
4.0.2
DNL error is the measure of variations in code widths
from the ideal code width. A DNL error of zero would
imply that every code is exactly 1 LSb wide.
FIGURE 4-2:
4.0.3
Offset error is the deviation from zero voltage output
when the digital input code is zero.
4.0.4
Gain error is the deviation from the ideal output,
V
REF
Digital
Input
Code
Digital
Input
Code
MCP4821/MCP4822
– 1 LSb, excluding the effects of offset error.
111
110
101
100
011
010
001
000
DNL ACCURACY
OFFSET ERROR
GAIN ERROR
111
110
101
100
011
010
001
000
Actual
Transfer
Function
Actual
Transfer
Function
DAC Output
INL Accuracy.
DNL Accuracy.
DAC Output
INL < 0
Narrow Code < 1 LSb
INL < 0
Wide Code > 1 LSb
DS21953A-page 15
Ideal Transfer
Function
Ideal Transfer
Function