MCP4332-503E/ST | |
|---|---|
| Manufacturer Part Number | MCP4332-503E/ST |
| Description | IC DGTL POT QUAD 50K 14TSSOP |
| Manufacturer | Microchip Technology |
| MCP4332-503E/ST datasheet |
|
Specifications of MCP4332-503E/ST | |||
|---|---|---|---|
| Taps | 129 | Resistance (ohms) | 50K |
| 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 | 14-TSSOP |
| Resistance In Ohms | 50K | Lead Free Status / RoHS Status | Lead free / RoHS Compliant |
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PrevNext
MCP433X/435X
Figure B-3
and
Figure B-4
show the wiper resistance
for V
voltages of 5.5, 3.0, 1.8 Volts. These graphs
DD
show that as the resistor ladder wiper node voltage
(V
) approaches the V
/2 voltage, the wiper
WCn
DD
resistance increases. These graphs also show the
different resistance characteristics of the NMOS and
PMOS transistors that make up the wiper switch. This
is demonstrated by the wiper code resistance curve,
which does not mirror itself around the mid-scale code
(wiper code = 128).
So why is the R
graphs showing the maximum
W
resistance at about mid-scale (wiper code = 128) and
the R
graphs showing the issue at code 160?
BW
This requires understanding low-voltage transistor
characteristics as well as how the data was measured.
220
-40C @ 3.0V
+25C @ 3.0V
+85C @ 3.0V
200
-40C @5.5V
+25C @ 5.5V
+85C @ 5.5V
180
160
140
120
100
80
60
40
20
0
64
128
Wiper Code
FIGURE B-3:
Wiper Resistance (R
Wiper Code and Temperature
(V
= 5.5V, I
= 900 UA; V
= 3.0V,
DD
W
DD
I
= 480
A).
µ
W
2020
-40C @ 1.8V
+25C @ 1.8V
+85C @ 1.8V
1520
+125C @ 1.8V
1020
520
20
0
64
128
Wiper Code
FIGURE B-4:
Wiper Resistance (R
Wiper Code and Temperature
(V
= 1.8V, I
= 260
A).
µ
DD
W
DS22242A-page 80
The method in which the data was collected is
important to understand.
technique that was used to measure the R
resistance. In this technique Terminal A is floating and
Terminal B is connected to ground. A fixed current is
then forced into the wiper (I
wiper voltage (V
current through R
voltage difference between the wiper (V
Terminal A (V
calculated, see
change the wiper voltage (V
device’s wiper resistance (R
floating
V
A
A
+125C @ 3.0V
+125C @ 5.5V
B
V
B
FIGURE B-5:
Figure B-6
shows a block diagram of the resistor
network where the R
192
256
resistors. These resistors are polysilicon devices. Each
wiper switch is an analog switch made up of an NMOS
and PMOS transistor. A more detailed figure of the
) vs.
W
wiper switch is shown in
resistance is influenced by the voltage on the wiper
switches nodes (V
influences the characteristics of the wiper switch, see
Figure
B-4.
The NMOS transistor and PMOS transistor have
different characteristics. These characteristics as well
as the wiper switch node voltages determine the R
resistance at each wiper code. The variation of each
wiper switch’s characteristics in the resistor network is
greater then the variation of the R
The voltage on the resistor network node (V
dependent upon the wiper code selected and the
voltages applied to V
voltage to V
W
192
256
the transistor is turned on. When the transistor is
weakly turned on the wiper resistance R
When the transistor is strongly turned on, the wiper
) vs.
W
resistance (R
Figure B-5
shows the
and R
BW
) and the corresponding
W
) is measured. Forcing a known
W
(I
) and then measuring the
BW
W
) and
W
), the wiper resistance (R
) can be
A
W
Figure
B-5. Changes in I
current will
W
). This may effect the
W
).
W
V
W
W
I
W
R
= V
/I
BW
W
W
R
= (V
-V
)/I
W
W
A
W
R
and R
Measurement.
BW
W
resistor is a series of 256 R
AB
Figure
B-7. The wiper
, V
and V
). Temperature also
G
W
WCn
resistors.
S
) is
WCn
, V
and V
. The wiper switch V
A
B
W
or V
voltage determines how strongly
WCn
will be high.
W
) will be in the typical range.
W
2010 Microchip Technology Inc.
W
S
W
G
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