MCP4351-103E/ST Microchip Technology, MCP4351-103E/ST Datasheet - Page 79

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MCP4351-103E/ST

Manufacturer Part Number
MCP4351-103E/ST
Description
IC DGTL POT QUAD 10K 20TSSOP
Manufacturer
Microchip Technology
Datasheet

Specifications of MCP4351-103E/ST

Taps
257
Resistance (ohms)
10K
Number Of Circuits
4
Temperature Coefficient
150 ppm/°C Typical
Memory Type
Volatile
Interface
SPI Serial
Voltage - Supply
1.8 V ~ 5.5 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
20-TSSOP
Resistance In Ohms
10K
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
APPENDIX B:
CHARACTERIZATION
DATA ANALYSIS
Some designers may desire to understand the device
operational characteristics outside of the specified
operating conditions of the device.
Applications where the knowledge of the resistor
network characteristics could be useful include battery
powered devices and applications that experience
brown-out conditions.
In battery applications the application voltage decays
over time until new batteries are installed. As the
voltage decays, the system will continue to operate. At
some voltage level, the application will be below its
specified operating voltage range. This is dependent
on the individual components used in the design. It is
still useful to understand the device characteristics to
expect when this low-voltage range is encountered.
Unlike a microcontroller which can use an external
supervisor device to force the controller into the Reset
state, a digital potentiometer’s resistance characteristic
is not specified. But understanding the operational
characteristics can be important in the design of the
applications circuit for this low-voltage condition.
Other application system scenarios where understand-
ing the low-voltage characteristics of the resistor net-
work could be important is for system brown out
conditions.
For the MCP433X/435X devices, the analog operation
is specified at a minimum of 2.7V. Device testing has
Terminal A connected to the device V
potentiometer configuration only) and Terminal B
connected to V
.
SS
 2010 Microchip Technology Inc.
MCP433X/435X
B.1
Low-Voltage Operation
This
appendix
gives
semiconductor characteristics at lower voltages. This is
important
so
that
characterization graphs of the MCP433X/435X devices
can be better understood.
For this discussion, we will use the 5 k device data.
This data was chosen since the variations of wiper
resistance has much greater implications for devices
with smaller R
resistances.
AB
Figure B-1
shows the worst case R
average R
as a percentage, while
BW
the R
resistance verse wiper code graph. Nonlinear
BW
behavior occurs at approximately wiper code 160. This
is better shown in
resistance changes from a linear slope. This change is
due to the change in the wiper resistance.
2.00%
1.00%
0.00%
-1.00%
-2.00%
-3.00%
-4.00%
-5.00%
-6.00%
-7.00%
0
32
64
(for
DD
FIGURE B-1:
from Average R
BW
and Temperature (V
7000
6000
5000
4000
3000
2000
1000
0
0
32
64
FIGURE B-2:
Temperature (V
DD
an
overview
of
CMOS
the
1.8V
resistor
network
error from the
BW
Figure B-2
shows
Figure
B-2, where the R
BW
-40C
+25C
+85C
+125C
96
128
160
192
224
256
Wiper Code
1.8V Worst Case R
Error
BW
(R
-R
) vs. Wiper Code
BW0
BW3
= 1.8V, I
= 190
A).
µ
DD
W
-40C
+25C
+85C
+125C
96
128
160
192
224
256
Wiper Code
R
vs. Wiper Code And
BW
= 1.8V, I
= 190
A).
µ
W
DS22242A-page 79

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