MCP4921-E/SN Microchip Technology, MCP4921-E/SN Datasheet - Page 34

• 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

MCP4901/4911/4921
6.9
The MCP4901/4911/4921 and MCP4902/MCP4912/
MCP4922 family devices use external reference, and
these devices are ideally suited for use as a multiplier/
divider in a signal chain. Common applications are: (a)
precision programmable gain/attenuator amplifiers and
(b) motor control feedback loops. The wide input range
(0V – V
range in Buffered mode. Its bandwidth (> 400 kHz),
selectable 1x/2x gain and low power consumption give
maximum flexibility to meet the application’s needs.
To configure the device for multiplier applications,
connect the input signal to V
the DAC’s input buffer, gain and output value. The
DAC’s output can utilize any of the examples from 6-1
to 6-6, depending on the application requirements.
Example 6-7
operate in a motor control feedback loop.
EXAMPLE 6-7:
DS22248A-page 34
DD
Using Multiplier Mode
(b) Dual Output DAC:
(a) Single Output DAC:
) is in Unbuffered mode, and near rail-to-rail
is an illustration of how the DAC can
MULTIPLIER MODE USING V
REF
MCP4922
MCP4902
MCP4912
MCP4901
MCP4911
MCP4921
and serially configure
V
REF
V OUT
SPI
3
REF
=
V
DAC
V
DD
REF
INPUT.
If the gain selection bit is configured for 1x mode
(<GA> = 1), the resulting input signal will be attenuated
by D/2
if the gain is configured for 2x mode (<GA> = 0), codes
less than 2048 attenuate the signal, while codes
greater than 2048 gain the signal.
A DAC provides significantly more gain/attenuation
resolution when compared to typical programmable
gain amplifiers. Adding an op amp to buffer the output,
as illustrated in Examples 6-2 through 6-6, extends the
output range and power to meet the precise needs of
the application.

G

Z
n
V
D
------
2
FB
. With the 12-bit DAC (MCP4921 or MCP4922),
OUT
N
n
V
V
RPM_SET
RPM
V
V
CC
 2010 Microchip Technology Inc.
CC
+
–
+
–
R
sense