MCP4802-E/SN Microchip Technology, MCP4802-E/SN Datasheet - Page 18

• Manufacturer Part Number: MCP4802-E/SN
• Description: DAC 8BIT DUAL SPI/VREF 8SOIC
• Manufacturer: Microchip Technology

Specifications of MCP4802-E/SN

• Number Of Converters: 2
• Settling Time: 4.5µs
• Package / Case: 8-SOIC (3.9mm Width)
• Number Of Bits: 8
• Data Interface: Serial, SPI™
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Number Of Dac Outputs: 2
• Resolution: 8 bit
• Interface Type: SPI
• Supply Voltage (max): 6.5 V
• Supply Voltage (min): 2.7 V
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 55 C
• Supply Current: 415 uA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power Dissipation (max): -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

MCP4802/4812/4822
4.0.2
A Differential Non-Linearity (DNL) error is the measure
of variations in code widths from the ideal code width.
A DNL error of zero indicates that every code is exactly
1 LSb wide.
FIGURE 4-2:
4.0.3
An offset error is the deviation from zero voltage output
when the digital input code is zero.
4.0.4
A gain error is the deviation from the ideal output,
V
DS22249A-page 18
Digital
Input
Code
REF
– 1 LSb, excluding the effects of offset error.
111
110
101
100
011
010
001
000
DNL ACCURACY
OFFSET ERROR
GAIN ERROR
Actual
Transfer
Function
DAC Output
Example for DNL Error.
Narrow Code, <1 LSb
Wide Code, >1 LSb
Ideal Transfer
Function
4.1
4.1.1
The DAC’s outputs are buffered with a low-power,
precision CMOS amplifier. This amplifier provides low
offset voltage and low noise. The output stage enables
the device to operate with output voltages close to the
power supply rails. Refer to Section 1.0 “Electrical
Characteristics” for the analog output voltage range
and load conditions.
In addition to resistive load-driving capability, the
amplifier will also drive high capacitive loads without
oscillation. The amplifier’s strong outputs allow V
be used as a programmable voltage reference in a
system.
4.1.1.1
The rail-to-rail output amplifier has two configurable
gain options: a gain of 1x (<GA> = 1) or a gain of 2x
(<GA> = 0). The default value for this bit is a gain
of 2 (<GA> = 0). This results in an ideal full-scale
output of 0.000V to 4.096V due to the internal
reference (V
4.1.2
The MCP4802/4812/4822 devices utilize internal
2.048V voltage reference. The voltage reference has a
low
characteristics. Refer to Section 1.0 “Electrical Char-
acteristics” for the voltage reference specifications.
temperature
Circuit Descriptions
OUTPUT AMPLIFIERS
VOLTAGE REFERENCE
REF
Programmable Gain Block
= 2.048V).
coefficient
 2010 Microchip Technology Inc.
and
low
OUT
noise
to