MCP4921-E/SN Microchip Technology, MCP4921-E/SN Datasheet - Page 19

• Manufacturer Part Number: MCP4921-E/SN
• Description: IC DAC 12BIT SNGL W/SPI 8SOIC
• Manufacturer: Microchip Technology

Specifications of MCP4921-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
• Package: 8SOIC N
• Architecture: Resistor-String
• Digital Interface Type: Serial (3-Wire, SPI, Microwire)
• Number Of Outputs Per Chip: 1
• Output Type: Voltage
• Full Scale Error: 1 %FSR
• Integral Nonlinearity Error: ±12 LSB
• Maximum Settling Time: 4.5(Typ) us
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power Dissipation (max): -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

4.0
The MCP4901, MCP4911 and MCP4921 are single
channel voltage output 8-bit, 10-bit and 12-bit DAC
devices, respectively. These devices include a V
input buffer, a rail-to-rail output amplifier, shutdown and
reset management circuitry. The devices use an SPI
serial communication interface and operate with a
single-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:
• MCP4901 (n = 8)
(a) 0V to 255/256*V
(b) 0V to 255/256*2*V
• MCP4911 (n = 10)
(a) 0V to 1023/1024*V
(b) 0V to 1023/1024*2*V
• MCP4921 (n = 12)
(a) 0V to 4095/4096*V
(b) 0V to 4095/4096*2*V
1 LSb is the ideal voltage difference between two
successive codes.
calculation of each device.
 2010 Microchip Technology Inc.
Where:
V
Note:
REF
D
G
n
n
Equation 4-1
GENERAL OVERVIEW
=
=
=
=
=
=
=
=
=
V
See the output swing voltage specification
in Section 1.0 “Electrical Characteris-
tics”.
OUT
E
DAC input code
Gain Selection
2 for <GA> bit = 0
1 for <GA> bit = 1
DAC Resolution
8 for MCP4901
10 for MCP4911
12 for MCP4912
X
ternal voltage reference
=
REF

------------------------------ - G
V
shows the DAC analog output
REF
Table 4-1
REF
REF
ANALOG OUTPUT
VOLTAGE (V
REF
when gain setting = 1x.
REF
REF
2
when gain setting = 2x.
when gain setting = 1x.
when gain setting = 1x.
n

when gain setting = 2x.
when gain setting = 2x.
D
n

illustrates the LSb
OUT
)
REF
TABLE 4-1:
4.1
4.1.1
Integral Non-Linearity (INL) error is the maximum
deviation between an actual code transition point and
its corresponding ideal transition point, after offset and
gain errors have been removed. The two endpoints
(from 0x000 and 0xFFF) method is used for the calcu-
lation.
A positive INL error represents transition(s) later than
ideal. A negative INL error represents transition(s) ear-
lier than ideal.
FIGURE 4-1:
4.1.2
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.
where V
MCP4901/4911/4921
Digital
Input
Code
MCP4901
MCP4911
MCP4921
(n = 10)
(n = 12)
Device
(n = 8)
Figure 4-1
REF
DC Accuracy
INL ACCURACY
DNL ACCURACY
111
110
101
100
011
010
001
000
is the external voltage reference.
Selection
shows the details.
LSb OF EACH DEVICE
Gain
Actual
Transfer
Function
1x
2x
1x
2x
1x
2x
Example for INL Error.
DAC Output
INL < 0
INL < 0
(2*V
(2*V
(2*V
V
LSb Size
V
DS22248A-page 19
V
REF
REF
Ideal Transfer
Function
REF
REF
REF
REF
/1024
/256
/4096
)/4096
)/1024
)/256