MCP4812T-E/MS Microchip Technology, MCP4812T-E/MS Datasheet - Page 17

• Manufacturer Part Number: MCP4812T-E/MS
• Description: Dual 10-bit DAC With SPI Interace And Internal Vref 8 MSOP 3x3mm T/R
• Manufacturer: Microchip Technology

Specifications of MCP4812T-E/MS

• Settling Time: 4.5µs
• Number Of Bits: 10
• Data Interface: Serial, SPI™
• Number Of Converters: 2
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power Dissipation (max): -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

4.0
The MCP4802, MCP4812 and MCP4822 are dual
voltage output 8-bit, 10-bit and 12-bit DAC devices,
respectively. These devices include rail-to-rail output
amplifiers, internal voltage reference, shutdown and
reset-management circuitry. The devices use an SPI
serial communication interface and operate with a sin-
gle supply voltage from 2.7V to 5.5V.
The DAC input coding of these devices is straight
binary.
voltage calculation.
EQUATION 4-1:
The ideal output range of each device is:
• MCP4802 (n = 8)
(a) 0.0V to 255/256 * 2.048V when gain setting = 1x.
(b) 0.0V to 255/256 * 4.096V when gain setting = 2x.
• MCP4812 (n = 10)
(a) 0.0V to 1023/1024 * 2.048V when gain setting = 1x.
(b) 0.0V to 1023/1024 * 4.096V when gain setting = 2x.
• MCP4822 (n = 12)
(a) 0.0V to 4095/4096 * 2.048V when gain setting = 1x.
(b) 0.0V to 4095/4096 * 4.096V when gain setting = 2x.
 2010 Microchip Technology Inc.
Note:
Where:
2.048V
Equation 4-1
D
GENERAL OVERVIEW
G
n
n
See the output swing voltage specification in
Section 1.0 “Electrical Characteristics”.
V
=
=
=
=
=
=
=
=
=
OUT
Internal voltage reference
DAC input code
Gain selection
2 for <GA> bit = 0
1 for <GA> bit = 1
DAC Resolution
8 for MCP4802
10 for MCP4812
12 for MCP4822
=
shows the DAC analog output

---------------------------------- -
ANALOG OUTPUT
VOLTAGE (V
2.048V
2
n

D
n


OUT
G
)
1 LSb is the ideal voltage difference between two
successive codes.
calculation of each device.
TABLE 4-1:
4.0.1
Integral Non-Linearity (INL) error for these devices is
the maximum deviation between an actual code transi-
tion point and its corresponding ideal transition point
once offset and gain errors have been removed. The
two end points method (from 0x000 to 0xFFF) is used
for the calculation.
A positive INL error represents transition(s) later than
ideal. A negative INL error represents transition(s)
earlier than ideal.
FIGURE 4-1:
MCP4802/4812/4822
Digital
Input
Code
MCP4802
MCP4812
MCP4822
(n = 10)
(n = 12)
Device
(n = 8)
INL ACCURACY
111
110
101
100
011
010
001
000
Selection
LSb OF EACH DEVICE
Gain
Figure 4-1
Actual
Transfer
Function
1x
2x
1x
2x
1x
2x
Table 4-1
Example for INL Error.
DAC Output
shows the details.
2.048V/4096 = 0.5 mV
INL < 0
4.096V/256 = 16 mV
2.048V/1024 = 2 mV
4.096V/1024 = 4 mV
4.096V/4096 = 1 mV
2.048V/256 = 8 mV
INL < 0
illustrates the LSb
LSb Size
DS22249A-page 17
Ideal Transfer
Function