Catalyst CAT5122TBI-00-GT3 16-tap minipot tm digitally programmable potentiometers with 2-wire interface Datasheet

CAT5120, CAT5121, CAT5122
16-Tap MiniPot™ Digitally Programmable
Potentiometers with 2-Wire Interface
Features
DEscription
■
0.3µA Ultra-low supply current
■
Single-supply operation: 2.7V to 5.5V
■
Glitchless switching between resistor taps
■
Power-on reset to midscale
■
2-Wire up/down serial interface
CAT5120/5121/5122 linear-taper digitally programmable
potentiometers 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.
■
Resistance values: 10kΩ, 50kΩ and 100kΩ
■
Available in SC70 and SOT-23 packages
The CAT5120 is configured as a potentiometer. The
CAT5121 and CAT5122 are configured as variable
resistors. See Pin Configurations for part functionality.
Three resistance values are available: 10kΩ, 50kΩ and
100kΩ. These are available in space-saving 5-pin and
6-pin SC70 and SOT-23 packages.
Applications
■
LCD screen adjustment
■
Volume control
■
Mechanical potentiometer replacement
■
Gain adjustment
■
Line impedance matching
Functional Diagram
H
VDD
CS
UP-DOWN
COUNTER
For Ordering Information details, see page 10.
U/D
16-POSITION
DECODER
GND
W
Pin Configuration
sC70
sOT-23
sC70
sOT-23
VDD 6 H
VDD GND 2
5 W
GND 2
L
Pin Descriptions
5 H
Name
CAT5120
U/D 3
CAT5122
4
CS
U/D 3
4 CS
VDD
Power Supply
GND
Ground
U/D
Up/Down Control Input. With CS low, a lowto-high transition increments or decrements
the wiper position.
CS
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.
sC70
sOT-23
VDD 6 H
GND 2
5 L
CAT5121
U/D 3
4
CS
© 2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Description
L
Low Terminal of Resistor
W
Wiper Terminal of Resistor
H
High Terminal of Resistor
Doc. No. 2121, Rev. C
CAT5120, CAT5121, CAT5122
Absolute Maximum Ratings(1)
VDD to GND
-0.3V to +6V
All Other Pins to GND
-0.3V to (VDD + 0.3)V
Input and Output Latch-Up Immunity
±200mA
Maximum Continuous Current into H, L and W
100kΩ
50kΩ
10kΩ
±0.6mA
±1.3mA
±1.3mA
Continuous Power Dissipation (TA = +70ºC)
5-pin SC70(2)
6-pin SC70(2)
247mW
245mW
Operating Temperature Range
-40ºC to +85ºC
Junction Temperature
+150ºC
Storage Temperature Range
-65ºC to +150ºC
Soldering Temperature (soldering, 10s)
+300ºC
Notes:
(1) Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only,
and functional operation of the device at these or any other conditions outside of those listed in the operational sections of this specification
is not implied. Exposure to any absolute maximum rating for extended periods may affect device performance and reliability.
(2) Derate 3.1mW/ºC above TA = +70ºC
Electrical CHARACTERISTICS
VDD = 2.7V to 5.5V, VH = VDD, VL = 0, TA = -40ºC to 85ºC. Typical values are at VDD = 2.7V, TA = 25ºC, unless
otherwise noted.
Parameter
Symbol
Conditions
Min
Typ
Max
Units
DC Performance
Resolution
16
Taps
End-to-End Resistance (-00)
75
100
125
End-to-End Resistance (-50)
37.5
50
62.5
End-to-End Resistance (-10)
7.5
10
12.5
End-to-End Resistance Tempco
TCR
Ratiometric Resistance Tempco
Integral Nonlinearity
INL
Differential Nonlinearity
DNL
Zero/Full-Scale Error
Wiper Resistance
RW
kΩ
200
ppm/ºC
5
ppm/ºC
±0.5
LSB
±0.5
LSB
±0.1
±0.5
LSB
200
600
Ω
Digital Inputs
Input High Voltage
VIH
Input Low Voltage
VIL
Doc. No. 2121, Rev. C
0.7 x VDD
V
0.3 x VDD
V
© 2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT5120, CAT5121, CAT5122
Electrical CHARACTERISTICS (continued)
VDD = 2.7V to 5.5V, VH = VDD, VL = 0, TA = -40ºC to 85ºC. Typical values are at VDD = 2.7V, TA = 25ºC, unless
otherwise noted.
Parameter
Symbol
Conditions
Min
Typ
Max
Units
Timing Characteristics (Figures 1, 2)
U/DMode to CS Setup
tCU
25
ns
CS to U/D Step Setup
tCI
50
ns
CS to U/D Step Hold
tIC
25
ns
U/D Step Low Period
tIL
25
ns
tIH
25
ns
U/D Step High Period
Up/Down Toggle Rate
Output Settling Time
(1)
fTOGGLE
(2)
tSETTLE
1
100kΩ variable resistor
configuration, CL = 10pF
1
100kΩ potentiometer
configuration, CL = 10pF
0.25
MHz
μs
Power Supply
Supply Voltage
VDD
Active Supply Current
(3)
Standby Supply Current
2.7
IDD
(4)
ISD
VDD = +5V
0.3
5.5
V
25
µA
1
µA
Notes:
(1) Up/Down Toggle Rate: fTOGGLE = 1/tSETTLE
(2) Typical setting times are dependant on end-to-end resistance.
(3) Supply current taken while changing wiper tap, fTOGGLE = 1MHz.
(4) Supply current taken while wiper position is fixed.
typical operating CHARACTERISTICS
TA = 25ºC, unless otherwise noted.
VDD = 2.7V
50K
VDD = 5.5V
0
4
8
12
16
20
24
28
32
WIPER POSITION
VDD= 5.5V
VDD= 2.7V
© 2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Doc No. 2121, Rev. C
CAT5120, CAT5121, CAT5122
Functional Description
The CAT5120/5121/5122 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.
Three end-to-end resistance values are available: 10kΩ,
50kΩ and 100kΩ.
The CS and U/D inputs control the position of the wiper
along the resistor array. When CS transitions from high
to 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 1 and 2).
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).
When the CS input transitions to high (serial interface
inactive), the value of the counter is stored and the wiper
position is maintained.
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 Minipots 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 powerup. By default, the chip is in the increment mode.
Figure 1. Serial Interface Timing Diagram, Increment Mode
CS
t CU
t IC
t IL
U/D
t IH
t CI
t SETTLE
t SETTLE
W
Note: "W" is not a digital signal. It represents wiper transitions.
Figure 2. Serial Interface Timing Diagram, Decrement Mode
CS
t IC
t 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.
Doc. No. 2121, Rev. C
© 2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT5120, CAT5121, CAT5122
Applications Information
The Minipots are intended for circuits requiring digitally
controlled adjustable resistance, such as LCD contrast
control, where voltage biasing adjusts the display
contrast.
Adjustable Gain
Figure 5 shows 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 Minipots have a low 5ppm/°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 3) to
select a portion of the input signal by digitally controlling
the wiper terminal. Figure 4 shows a similar circuit for
the CAT5121.
Figure 3. Positive LCD Bias Control
Figure 4. Positive LCD Bias Control
+5V
+5V
H
H
30V
30V
W
VOUT
VOUT
CAT5121 L
CAT5120 L
Figure 5a. Adjustable Gain Circuit
Figure 5b. Adjustable Gain Circuit
V CC
VCC
VIN
VIN
VOUT
VOUT
H
W
H
L
CAT5120
CAT5121 L
© 2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Doc No. 2121, Rev. C
CAT5120, CAT5121, CAT5122
Package Information
SC-70 6 LEAD
e
e
E1
b
D
A2
A
GAUGE
PLANE
c
L
A1
θ
L2
L1
SYMBOL
MIN
A
0.80
A1
0.00
A2
0.70
b
0.15
c
0.08
NOM
1.10
0.10
0.90
2.00 BSC
E
2.10 BSC
E1
1.25 BSC
e
0.65 BSC
L
0.26
0.36
0.25
0.46
For current Tape and Reel information,
download the PDF file from:
www.catsemi.com/documents/tapeandreel.pdf
0.42 REF
L2
θ
1.00
0.30
0.20
D
L1
MAX
0.15 BSC
0°
8°
Notes:
1. Dimension are in mm.
2. Dimension are inclusive of planting.
3. Dimension are exclusive of mold flash & metal burr.
4. All specification comply to JDEC M0-203
Doc. No. 2121, Rev. C
© 2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT5120, CAT5121, CAT5122
SC-70 5 LEAD
e
e
E1
b
D
A2
A
GAUGE
PLANE
c
L
A1
θ
L2
L1
SYMBOL
MIN
NOM
MAX
A
0.80
1.10
A1
0.00
0.10
A2
0.80
1.00
b
0.15
0.30
c
0.10
D
1.80
2.00
2.20
E
1.15
1.25
1.35
E1
1.80
2.10
2.40
e
L
0.65 BSC
0.26
L1
0.36
0.46
For current Tape and Reel information,
download the PDF file from:
www.catsemi.com/documents/tapeandreel.pdf
0.42 REF
L2
θ
0.18
0.15 BSC
0°
8°
Notes:
(1) Dimension are in millimeter.
(2) All specification comply to JDEC M0-203
© 2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Doc No. 2121, Rev. C
CAT5120, CAT5121, CAT5122
PACKAGE INFORMATION
SOT-23 6 LEAD
SYMBOL
MIN
A
0.90
1.45
A1
0.00
0.15
A2
0.90
1.30
b
0.30
0.50
c
0.08
0.22
D
2.90 BSC
E
2.80 BSC
E1
1.60 BSC
e
0.95 BSC
L
0.30
L1
θ
SIDE VIEW
0.45
MAX
0.60
0.60 REF
L2
TOP VIEW
NOM
0.25 BSC
0°
8°
θ1
10°
θ2
10°
END VIEW
For current Tape and Reel information, download the PDF file from:
www.catsemi.com/documents/tapeandreel.pdf
Notes:
(1) All dimensions in millimeters. Angles in degrees.
(2) Complies with JEDEC standard MO-178.
Doc. No. 2121, Rev. C
© 2007 by Catalyst Semiconductor, Inc.
Doc.
No. 139
/ 031607
Characteristics subject
to change
without
notice
CAT5120, CAT5121, CAT5122
PACKAGE INFORMATION
SOT-23 5 LEAD
SYMBOL
MIN
A
0.90
1.45
A1
0.00
0.15
A2
0.90
1.30
b
0.30
0.50
c
0.08
0.22
D
2.90 BSC
E
2.80 BSC
E1
1.60 BSC
e
0.95 BSC
L
0.30
L1
θ
SIDE VIEW
0.45
MAX
0.60
0.60 REF
L2
TOP VIEW
NOM
0.25 BSC
0°
8°
θ1
10°
θ2
10°
END VIEW
For current Tape and Reel information, download the PDF file from:
www.catsemi.com/documents/tapeandreel.pdf
Notes:
(1) All dimensions in millimeters. Angles in degrees.
(2) Complies with JEDEC standard MO-178.
© 2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Doc No. 2121, Rev. C
Doc. No. 111 / 031607
CAT5120, CAT5121, CAT5122
EXAMPLE OF Ordering Information
Prefix
Device #
CAT
5120
Company ID
Product Number
5120
5121
5122
Suffix
SD
I
Package
SD: SC70
TB: SOT-23
-10
-G
Resistance
-10: 10kΩ
-50: 50kΩ
-00: 100kΩ
Temperature Range
I = Industrial (-40°C to 85°C)
T10
Tape & Reel
T: Tape & Reel
3: 3000/Reel
10: 10000/Reel
Lead Finish
Blank: Matte-Tin
G: NiPdAu
Notes:
(1) All packages are RoHS-compliant (Lead-free, Halogen-free).
(2) The standard lead finish is NiPdAu.
(2) The device used in the example above is a CAT5120SDI-10-GT10 (SC70, Industrial Temperature range, NiPdAu, Tape and Reel).
(3) For additional package and temperature options, please contact your nearest Catalyst Semiconductor Sales office.
Doc. No. 2121, Rev. C
10
© 2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT5120, CAT5121, CAT5122
Ordering Information
Resistor
[kΩ]
Package
Marking
Pin Package
CAT5120SDI-10-GT3
10
KC_
SC70-6
3,000
CAT5120SDI-10-GT10
10
KC_
SC70-6
10,000
CAT5120TBI-10-T3
10
KCYM
SOT23-6
3,000
CAT5120TBI-10-T10
10
KCYM
SOT23-6
10,000
CAT5120TBI-10-GT3
10
KCYM
SOT23-6
3,000
CAT5120TBI-10-GT10
10
KCYM
SOT23-6
10,000
CAT5120SDI-50-GT3
50
KD_
SC70-6
3,000
CAT5120SDI-50-GT10
50
KD_
SC70-6
10,000
CAT5120TBI-50-T3
50
KDYM
SOT23-6
3,000
CAT5120TBI-50-T10
50
KDYM
SOT23-6
10,000
CAT5120TBI-50-GT3
50
KDYM
SOT23-6
3,000
CAT5120TBI-50-GT10
50
KDYM
SOT23-6
10,000
CAT5120SDI-00-GT3
100
KE_
SC70-6
3,000
CAT5120SDI-00-GT10
100
KE_
SC70-6
10,000
CAT5120TBI-00-T3
100
KEYM
SOT23-6
3,000
CAT5120TBI-00-T10
100
KEYM
SOT23-6
10,000
CAT5120TBI-00-GT3
100
KEYM
SOT23-6
3,000
CAT5120TBI-00-GT10
100
KEYM
SOT23-6
10,000
CAT5121SDI-10-GT3
10
KF_
SC70-6
3,000
CAT5121SDI-10-GT10
10
KF_
SC70-6
10,000
CAT5121TBI-10-T3
10
KFYM
SOT23-6
3,000
CAT5121TBI-10-T10
10
KFYM
SOT23-6
10,000
CAT5121TBI-10-GT3
10
KFYM
SOT23-6
3,000
CAT5121TBI-10-GT10
10
KFYM
SOT23-6
10,000
CAT5121SDI-50-GT3
50
KG_
SC70-6
3,000
CAT5121SDI-50-GT10
50
KG_
SC70-6
10,000
CAT5121TBI-50-T3
50
KGYM
SOT23-6
3,000
CAT5121TBI-50-T10
50
KGYM
SOT23-6
10,000
CAT5121TBI-50-GT3
50
KGYM
SOT23-6
3,000
CAT5121TBI-50-GT10
50
KGYM
SOT23-6
10,000
CAT5121SDI-00-GT3
100
KH_
SC70-6
3,000
CAT5121SDI-00-GT10
100
KH_
SC70-6
10,000
CAT5121TBI-00-T3
100
KHYM
SOT23-6
3,000
CAT5121TBI-00-T10
100
KHYM
SOT23-6
10,000
CAT5121TBI-00-GT3
100
KHYM
SOT23-6
3,000
CAT5121TBI-00-GT10
100
KHYM
SOT23-6
10,000
Part Number
© 2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
11
Quantity
per Reel
Doc No. 2121, Rev. C
CAT5120, CAT5121, CAT5122
Ordering Information (continue)
Resistor
[kΩ]
Package
Marking
Pin Package
CAT5122SDI-10-GT3
10
KY_
SC70-5
3,000
CAT5122SDI-10-GT10
10
KY_
SC70-5
10,000
CAT5122TBI-10-T3
10
KYYM
SOT23-5
3,000
CAT5122TBI-10-T10
10
KYYM
SOT23-5
10,000
CAT5122TBI-10-GT3
10
KYYM
SOT23-5
3,000
CAT5122TBI-10-GT10
10
KYYM
SOT23-5
10,000
CAT5122SDI-50-GT3
50
KA_
SC70-5
3,000
CAT5122SDI-50-GT10
50
KA_
SC70-5
10,000
CAT5122TBI-50-T3
50
KAYM
SOT23-5
3,000
CAT5122TBI-50-T10
50
KAYM
SOT23-5
10,000
CAT5122TBI-50-GT3
50
KAYM
SOT23-5
3,000
CAT5122TBI-50-GT10
50
KAYM
SOT23-5
10,000
CAT5122SDI-00-GT3
100
KB_
SC70-5
3,000
CAT5122SDI-00-GT10
100
KB_
SC70-5
10,000
CAT5122TBI-00-T3
100
KBYM
SOT23-5
3,000
CAT5122TBI-00-T10
100
KBYM
SOT23-5
10,000
CAT5122TBI-00-GT3
100
KBYM
SOT23-5
3,000
CAT5122TBI-00-GT10
100
KBYM
SOT23-5
10,000
Part Number
Doc. No. 2121, Rev. C
12
Quantity
per Reel
© 2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
REVISION HISTORY
Date
Rev.
Reason
03/10/2005
A
Initial Issue
09/27/2006
B
Update Electrical Characteristics
C
Update Ordering Information
Update Package Outlines
Add Example of Ordering Information
Add SOT-23 5 Lead package drawing
Update SOT-23 6 Lead package drawing
03/12/2007
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Beyond Memory ™, DPP ™, EZDim™, MiniPot™ and Quad Mode™
Catalyst Semiconductor has been issued U.S. and foreign patents and has patent applications pending that protect its products.
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applications intended to support or sustain life, or for any other application in which the failure of the Catalyst Semiconductor product could create a situation where
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Corporate Headquarters
2975 Stender Way
Santa Clara, CA 95054
Phone: 408.542.1000
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Document No: 2121
Revision:
C
Issue date:
03/12/07
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