MCP4351-502E/ML

Manufacturer Part NumberMCP4351-502E/ML
DescriptionIC DGTL POT QUAD 5K 20QFN
ManufacturerMicrochip Technology
MCP4351-502E/ML datasheet
 

Specifications of MCP4351-502E/ML

Taps257Resistance (ohms)5K
Number Of Circuits4Temperature Coefficient150 ppm/°C Typical
Memory TypeVolatileInterfaceSPI Serial
Voltage - Supply1.8 V ~ 5.5 VOperating Temperature-40°C ~ 125°C
Mounting TypeSurface MountPackage / Case20-VQFN Exposed Pad, 20-HVQFN, 20-SQFN, 20-DHVQFN
Resistance In Ohms5KLead Free Status / RoHS StatusLead free / RoHS Compliant
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Page 83/88

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B.2
Optimizing Circuit Design for Low-
Voltage Characteristics
The low-voltage nonlinear characteristics can be
minimized by application design. The section will show
two application circuits that can be used to control a
programmable reference voltage (V
OUT
Minimizing the low-voltage nonlinear characteristics is
done by keeping the voltages on the wiper switch
nodes at a voltage where either the NMOS or PMOS
transistor is turned on.
An example of this is if we are using a digital potentiom-
eter for a voltage reference (V
). Lets say that we
OUT
want V
to range from 0.5 * V
to 0.6 * V
OUT
DD
In example implementation #1
(Figure
window the digital potentiometer using resistors R1 and
R2. When the wiper code is at full scale the V
voltage will be  0.6 * V
and when the wiper code is
DD,
voltage will be  0.5 * V
at zero scale the V
OUT
Remember that the digital potentiometers R
must be included.
Table B-1
shows that the V
age can be selected to be between 0.455 * V
0.727 * V
, which includes the desired range. With
DD
respect to the voltages on the resistor network node, at
1.8V the V
voltage would range from 1.29V to 1.31V
A
while the V
voltage would range from 0.82V to 0.86V.
B
These voltages cause the wiper resistance to be in the
nonlinear region (see
Figure
B-12). In Potentiometer
mode, the variation of the wiper resistance is typically
not an issue, as shown by the INL/DNL graph
(Figure
2-7).
In example implementation #2
(Figure
the digital potentiometer in Rheostat mode. The resis-
tor ladder uses resistors R1 and R2 with R
bottom of the ladder. When the wiper code is at full
voltage will be  0.6 * V
scale, the V
OUT
the wiper code is at full scale the V
OUT
 0.5 * V
. Remember that the digital potentiometers
DD
R
variation must be included.
Table B-2
AB
the V
voltage can be selected to be between 0.50 *
OUT
V
and 0.687 * V
, which includes the desired
DD
DD
range. With respect to the voltages on the resistor net-
work node, at 1.8V the V
voltage would range from
W
0.29V to 0.38V. These voltages cause the wiper
resistance to be in the linear region (see
 2010 Microchip Technology Inc.
R1
).
R2
FIGURE B-15:
.
DD
B-15) we
TABLE B-1:
OUT
.
DD
variation
AB
volt-
R1
OUT
and
DD
R2
R
AB
V
(@ FS) 0.714 V
OUT
V
(@ ZS) 0.476 V
OUT
V
A
V
B
Legend: FS – Full Scale, ZS – Zero Scale
B-16) we use
at the
BW
and when
DD
voltage will be
shows that
Figure
B-12).
MCP433X/435X
V
A
A
V
W
W
V
OUT
B
V
B
Example Implementation #1.
EXAMPLE #1 VOLTAGE
CALCULATIONS
Variation
Min
Typ
Max
12,000
12,000
12,000
20,000
20,000
20,000
8,000
10,000
12,000
0.70 V
0.727 V
DD
DD
DD
0.50 V
0.455 V
DD
DD
DD
0.714 V
0.70 V
0.727 V
DD
DD
DD
0.476 V
0.50 V
0.455 V
DD
DD
DD
DS22242A-page 83

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