CAT5121TPI-50-T [ONSEMI]
50K DIGITAL POTENTIOMETER, INCREMENT/DECREMENT CONTROL INTERFACE, 16 POSITIONS, PDSO6, SOT-23, 6 PIN;
| 型号： | CAT5121TPI-50-T |
| 厂家： | 
ONSEMI |
| 描述： | 50K DIGITAL POTENTIOMETER, INCREMENT/DECREMENT CONTROL INTERFACE, 16 POSITIONS, PDSO6, SOT-23, 6 PIN 光电二极管 转换器 |
| 文件： | 总11页 (文件大小：186K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
CAT5120, CAT5121,
CAT5122
16‐tap Digital
Potentiometers (POTs)
with 2‐wire Interface
Description
http://onsemi.com
CAT5120/5121/5122 linear-taper digital POTs perform the same
function as a mechanical potentiometer or a variable resistor. These
devices consist of a fixed resistor and a wiper contact with 16-tap
points that are digitally controlled through a 2-wire up/down serial
interface.
The CAT5120 is configured as a potentiometer. The CAT5121 and
CAT5122 are configured as variable resistors. See Pin Configurations
for part functionality.
SC−70
SD SUFFIX
CASE 419AD
SOT−23
TB SUFFIX
CASE 527AJ
Two resistance values are available: 10 kW and 50 kW. These are
available in space-saving 5-pin and 6-pin SC−70 and SOT−23
packages.
SC−70
SD SUFFIX
CASE 419AC
SOT−23
TB SUFFIX
CASE 527AH
Features
0.3 mA Ultra-low Standby Current
Single-supply Operation: 2.7 V to 5.5 V
Glitchless Switching between Resistor Taps
Power-on Reset to Midscale
2-wire Up/Down Serial Interface
Resistance Values: 10 kW, 50 kW
Available in SC−70 and SOT−23 Packages
PIN CONFIGURATIONS
SC−70
SOT−23
1
6
5
4
V
H
DD
W
GND 2
CAT5120
U/D
CS
3
These Devices are Pb-Free, Halogen Free/BFR Free and are RoHS
Compliant
SC−70
SOT−23
Applications
LCD Screen Adjustment
Volume Control
Mechanical Potentiometer Replacement
Gain Adjustment
6
5
4
1
H
V
DD
2
3
L
GND
U/D
CAT5121
CS
Line Impedance Matching
SC−70
SOT−23
1
2
3
H
5
4
V
DD
GND
U/D
CAT5122
CS
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 7 of this data sheet.
Semiconductor Components Industries, LLC, 2013
1
Publication Order Number:
July, 2013 − Rev. 8
CAT5120/D
CAT5120, CAT5121, CAT5122
H
V
DD
GND
CS
W
U/D
L
Figure 1. Functional Diagram
Table 1. PIN DESCRIPTIONS
Name
Description
V
Power Supply
Ground
DD
GND
U/D
CS
L
Up/Down Control Input. With CS low, a low-to-high transition increments or decrements the wiper position.
Chip Select Input. A high-to-low CS transition determines the mode: increment if U/D is high, or decrement if U/D is low.
Low Terminal of Resistor
Wiper Terminal of Resistor
High Terminal of Resistor
W
H
Table 2. ABSOLUTE MAXIMUM RATINGS
Parameters
Ratings
Units
V
V
DD
to GND
−0.3 to +6
All Other Pins to GND
−0.3 to (V + 0.3)
V
DD
Input and Output Latch-up Immunity
200
mA
mA
Maximum Continuous Current into H, L and W
50 kW
ą10 kW
1.3
1.3
Continuous Power Dissipation (T = +70C)
5-pin SC−70 (Note 1)
6-pin SC−70 (Note 1)
mW
A
247
245
Operating Temperature Range
Junction Temperature
−40 to +85
+150
C
C
C
C
Storage Temperature Range
Soldering Temperature (soldering, 10 s)
−65 to +150
+300
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
1. Derate 3.1 mW/C above T = +70C
A
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2
CAT5120, CAT5121, CAT5122
Table 3. ELECTRICAL CHARACTERISTICS
(V = 2.7 V to 5.5 V, V = V , V = 0, T = −40C to +85C. Typical values are at V = 2.7 V, T = 25C, unless otherwise noted.)
DD
H
DD
L
A
DD
A
Parameter
Symbol
Conditions
Min
Typ
Max
Units
DC PERFORMANCE
Resolution
16
37.5
7.5
Taps
End-to-End Resistance (−50)
End-to-End Resistance (−10)
50
10
200
5
62.5
12.5
kW
End-to-End Resistance Tempco
Ratiometric Resistance Tempco
Integral Non-linearity
Differential Non-linearity
Zero/Full-Scale Error
Wiper Resistance
TC
ppm/C
ppm/C
LSB
R
INL
0.5
0.5
0.5
600
DNL
LSB
0.1
LSB
R
W
200
W
DIGITAL INPUTS
Input High Voltage
V
0.7 x V
V
V
IH
DD
Input Low Voltage
V
0.3 x V
IL
DD
TIMING CHARACTERISTICS (Figures 7, 8)
U/D Mode to CS Setup
t
25
50
25
25
25
ns
ns
CU
CS to U/D Step Setup
t
CI
IC
CS to U/D Step Hold
t
ns
U/D Step Low Period
t
ns
IL
U/D Step High Period
t
ns
IH
Up/Down Toggle Rate (Note 2)
Output Settling Time (Note 3)
f
1
1
MHz
ms
TOGGLE
t
50 kW variable resistor
SETTLE
configuration, C = 10 pF
L
50 kW potentiometer
0.25
configuration, C = 10 pF
L
POWER SUPPLY
Supply Voltage
V
2.7
5.5
25
1
V
DD
Active Supply Current (Note 4)
Standby Supply Current (Note 5)
I
mA
mA
DD
I
V
= +5 V
0.3
SB
= 1 / t
SETTLE
DD
2. Up/Down Toggle Rate: f
TOGGLE
3. Typical settling times are dependent on end-to-end resistance.
4. Supply current measured while changing wiper tap, f
= 1 MHz.
TOGGLE
5. Supply current measured while wiper position is fixed.
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3
CAT5120, CAT5121, CAT5122
TYPICAL OPERATING CHARACTERISTICS
(T = 25C, unless otherwise noted.)
A
250
200
150
100
1.5
1.0
V
= 2.7 V
= 5.5 V
DD
0.5
50 K
0
V
DD
−0.5
−1.0
50
0
−1.5
−2.0
0
4
8
12
16
20
24
28
32
−50
0
50
TEMPERATURE (C)
100
150
WIPER POSITION
Figure 2. Wiper Resistance vs. Tap Position
Figure 3. Change in End-to-End Resistance vs.
Temperature
120
100
80
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
V
= 5.5 V
= 2.7 V
DD
100 k
V
DD
60
50 k
10 k
40
20
0
0.05
0
1
3
5
7
9
11 13 15 17 19 21 23 25 27 29 31
TAP POSITION
−50
0
50
100
150
TEMPERATURE (C)
Figure 4. W-to-L Resistance vs. Tap Position
Figure 5. Supply Current vs. Temperature
U/D
2 V/div
Wiper
Output
100 mV/div
200 ns/div
Figure 6. Tap-to-Tap Switching Transient
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4
CAT5120, CAT5121, CAT5122
FUNCTIONAL DESCRIPTION
The CAT5120/5121/5122 consist of a fixed resistor and a
low, the part will go into increment mode if U/D input is
high, and into decrement mode when U/D input is low. Once
the mode is set, the device will remain in that mode until CS
goes high again. A low-to-high transition at the U/D pin will
increment or decrement the wiper position depending on the
current mode (Figures 7 and 8).
When the CS input transitions to high (serial interface
inactive), the value of the counter is stored and the wiper
position is maintained.
wiper contact with 16-tap points that are digitally controlled
through a 2-wire up/down serial interface. Two end-to-end
resistance values are available: 10 kW and 50 kW.
The CAT5120 is designed to operate as a potentiometer.
In this configuration, the low terminal of the resistor array
is connected to ground (pin 2).
The CAT5122 performs as a variable resistor. In this
device, the wiper terminal and high terminal of the resistor
array is connected at pin 5. The CAT5121 is a similar
variable resistor, except the low terminal is connected to
pin 5.
Note that when the wiper reaches the maximum (or
minimum) tap position, the wiper will not wrap around to the
minimum (or maximum) position.
Digital Interface Operation
Power-on Reset
The devices have two modes of operation when the serial
interface is active: increment and decrement mode. The
serial interface is only active when CS is low.
All parts in this family feature power-on reset (POR)
circuitry that sets the wiper position to midscale at
power-up. By default, the chip is in the increment mode.
The CS and U/D inputs control the position of the wiper
along the resistor array. When CS transitions from high to
CS
t
t
IC
CU
t
IL
U/D
W
t
IH
t
CI
t
SETTLE
t
SETTLE
Note: “W” is not a digital signal. It represents wiper transitions.
Figure 7. Serial Interface Timing Diagram, Increment Mode
CS
t
t
IC
CU
t
IH
U/D
t
IL
t
CI
W
t
SETTLE
t
SETTLE
Note: “W” is not a digital signal. It represents wiper transitions.
Figure 8. Serial Interface Timing Diagram, Decrement Mode
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5
CAT5120, CAT5121, CAT5122
APPLICATIONS INFORMATION
Adjustable Gain
The devices are intended for circuits requiring digitally
controlled adjustable resistance, such as LCD contrast
control, where voltage biasing adjusts the display contrast.
Figures 11 and 12 show how to use the variable resistor to
digitally adjust the gain of a noninverting op amp
configuration. Connect the CAT5121 in series with a resistor
to ground to form the adjustable gain control of a
noninverting amplifier. The devices have a low 5 ppm/C
ratiometric tempco that allows for a very stable adjustable
gain configuration over temperature.
Alternative Positive LCD Bias Control
Use an op amp to provide buffering and gain on the output
of the CAT5120. Connect the mechanical potentiometer to
the positive input of a noninverting op amp (Figure 9) to
select a portion of the input signal by digitally controlling the
wiper terminal. Figure 10 shows a similar circuit for the
CAT5121.
+5 V
+5 V
H
H
30 V
30 V
W
V
OUT
V
OUT
L
L
CAT5121
CAT5120
Figure 9. Positive LCD Bias Control
Figure 10. Positive LCD Bias Control
V
CC
V
CC
V
IN
V
IN
V
OUT
V
OUT
H
W
H
L
CAT5120
L
CAT5121
Figure 11. Adjustable Gain Circuit
Figure 12. Adjustable Gain Circuit
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6
CAT5120, CAT5121, CAT5122
Table 4. ORDERING INFORMATION
†
Orderable Part Number
Resistor [kW]
Package
Shipping
CAT5120SDI−10GT3
10
SC70−6
3000 / Tape & Reel
3000 / Tape & Reel
3000 / Tape & Reel
3000 / Tape & Reel
3000 / Tape & Reel
3000 / Tape & Reel
3000 / Tape & Reel
3000 / Tape & Reel
3000 / Tape & Reel
3000 / Tape & Reel
3000 / Tape & Reel
3000 / Tape & Reel
(Pb−Free)
CAT5120TBI−10GT3
CAT5120SDI−50GT3
CAT5120TBI−50GT3
CAT5121SDI−10GT3
CAT5121TBI−10GT3
CAT5121SDI−50GT3
CAT5121TBI−50GT3
CAT5122SDI−10GT3
CAT5122TBI−10GT3
CAT5122SDI−50GT3
CAT5122TBI−50GT3
10
50
50
10
10
50
50
10
10
50
50
SOT23−6
(Pb−Free)
SC70−6
(Pb−Free)
SOT23−6
(Pb−Free)
SC70−6
(Pb−Free)
SOT23−6
(Pb−Free)
SC70−6
(Pb−Free)
SOT23−6
(Pb−Free)
SC70−5
(Pb−Free)
SOT23−5
(Pb−Free)
SC70−5
(Pb−Free)
SOT23−5
(Pb−Free)
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
6. For detailed information and a breakdown of device nomenclature and numbering systems, please see the ON Semiconductor Device
Nomenclature document, TND310/D, available at www.onsemi.com.
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7
CAT5120, CAT5121, CAT5122
PACKAGE DIMENSIONS
SC−88 (SC−70 6 Lead), 1.25x2
CASE 419AD
ISSUE A
SYMBOL
MIN
NOM
MAX
D
0.80
A
1.10
e
e
A1
A2
0.00
0.80
0.10
1.00
b
c
0.15
0.10
1.80
1.80
1.15
0.30
0.18
2.20
2.40
1.35
D
2.00
2.10
E1
E
E
E1
e
1.25
0.65 BSC
0.36
L
0.26
0.46
L1
L2
0.42 REF
0.15 BSC
TOP VIEW
0º
4º
8º
θ
10º
θ1
q1
A2
A1
A
q
L
b
L1
q1
c
L2
SIDE VIEW
END VIEW
Notes:
(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC MO-203.
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8
CAT5120, CAT5121, CAT5122
PACKAGE DIMENSIONS
SOT−23, 6 Lead
CASE 527AJ
ISSUE B
D
A
B
NOTES:
1. DIMENSIONING AND TOLERANCING PER
ASME Y14.5M, 1994.
2. CONTROLLING DIMENSION: MILLIMETERS.
3. DATUM C IS THE SEATING PLANE.
6
1
5
2
4
3
MILLIMETERS
E
E1
L2
GAGE
PLANE
DIM MIN
MAX
1.45
0.15
1.30
0.50
0.26
3.00
3.10
1.80
A
A1
A2
b
---
0.00
0.90
0.20
0.08
2.70
2.50
1.30
SEATING
PLANE
6X b
0.20
L
c
e
M
S
S
B
D
C A
DETAIL A
E
TOP VIEW
SIDE VIEW
E1
e
0.95 BSC
A2
A
L
0.20
0.60
L2
0.25 BSC
c
6X
0.10 C
DETAIL A
SEATING
PLANE
END VIEW
C
A1
RECOMMENDED
SOLDERING FOOTPRINT*
3.30
6X
0.85
6X
0.56
0.95
PITCH
DIMENSIONS: MILLIMETERS
*For additional information on our Pb−Free strategy and soldering
details, please download the ON Semiconductor Soldering and
Mounting Techniques Reference Manual, SOLDERRM/D.
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9
CAT5120, CAT5121, CAT5122
PACKAGE DIMENSIONS
SC−88A (SC−70 5 Lead), 1.25x2
CASE 419AC
ISSUE A
SYMBOL
MIN
NOM
MAX
D
0.80
A
1.10
e
e
A1
A2
0.00
0.80
0.10
1.00
b
c
0.15
0.10
1.80
1.80
1.15
0.30
0.18
2.20
2.40
1.35
D
2.00
2.10
E1
E
E
E1
e
1.25
0.65 BSC
0.36
L
0.26
0.46
L1
L2
0.42 REF
0.15 BSC
TOP VIEW
0º
4º
8º
θ
10º
θ1
q1
A2
A1
A
q
L
b
L1
q1
c
L2
SIDE VIEW
END VIEW
Notes:
(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC MO-203.
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10
CAT5120, CAT5121, CAT5122
PACKAGE DIMENSIONS
SOT−23, 5 Lead
CASE 527AH
ISSUE O
D
SYMBOL
MIN
NOM
MAX
1.45
0.15
1.30
0.50
0.22
A
A1
A2
b
0.90
0.00
0.90
0.30
0.08
1.15
c
D
E
E1
2.90 BSC
2.80 BSC
1.60 BSC
0.95 BSC
0.45
E
E1
e
e
L
0.30
0.60
L1
0.60 REF
PIN #1 IDENTIFICATION
L2
θ
0.25 REF
4°
0°
5°
5°
8°
15°
15°
TOP VIEW
θ1
10°
θ2
10°
θ1
A2
A
θ
b
L1
L
θ2
c
A1
L2
SIDE VIEW
END VIEW
Notes:
(1) All dimensions in millimeters. Angles in degrees.
(2) Complies with JEDEC standard MO-178.
ON Semiconductor and
are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC owns the rights to a number of patents, trademarks,
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limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications
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CAT5120/D
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