X9015UM8-2.7 [XICOR]
Digital Potentiometer 1 Func 50000ohm Increment/decrement Control Interface 32 Positions CMOS PDSO8;
| 型号： | X9015UM8-2.7 |
| 厂家： | 
XICOR INC. |
| 描述： | Digital Potentiometer 1 Func 50000ohm Increment/decrement Control Interface 32 Positions CMOS PDSO8 光电二极管 转换器 电阻器 |
| 文件： | 总12页 (文件大小：146K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
APPLICATION NOTE
A V A I L A B L E
AN99 • AN115 • AN120 • AN124 • AN133 • AN134
Low Noise, Low Power, Volatile
X9015
Digitally Controlled Potentiometer (XDCP™)
FEATURES
• 32 taps
DESCRIPTION
The Xicor X9015 is a 32 tap potentiometer that is vola-
tile. The device consists of a string of 31 resistors that
can be programmed to connect the R /V wiper out-
• Three-wire up/down serial interface
• V = 2.7V–5V
CC
W
W
• Operating I
= 50µA max.
put with any of the nodes between the connecting
resistors. The connection point of the wiper is deter-
mined by information communicated to the device on
the 3-wire port. The 3-wire port changes the tap posi-
tion by a falling edge on the increment pin.The direction
the wiper moves is determined by the state of the up/
down pin.The wiper position at power up is Tap #15.
CC
• Standby current = 1µA max.
• R = 10KΩ, 50KΩ, 100KΩ
TOTAL
• Packages SOIC-8, MSOP-8
The X9015 can be used in a wide variety of applica-
tions that require a digitally controlled variable resistor
to set analog values.
BLOCK DIAGRAM
U/D
INC
CS
5-Bit
Up/Down
Counter
R /V
31
H
H
V
(Supply Voltage)
CC
30
29
28
R /V
Up/Down
H
H
(U/D)
One
of
Increment
(INC)
Control
R /V
W W
Thirty
Transfer
Gates
Resistor
Array
Two
Device Select
(CS)
Decoder
R /V
L
L
2
V
(Ground)
SS
1
0
Control
Circuitry
General
V
V
CC
SS
R /V
L
L
R
/V
W
W
Detailed
XDCP is a trademark of Xicor, Inc.
REV 1.0 6/26/00
Characteristics subject to change without notice. 1 of 12
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X9015
PIN DESCRIPTIONS
PIN NAMES
Symbol
Description
High terminal
R /V and R /V
H
L
H
L
R /V
H
H
W
L
The high (R /V ) and low (R /V ) terminals of the
X9015 are equivalent to the fixed terminals of a
mechanical potentiometer. The minimum voltage is
H
L
H
L
R /V
W
Wiper terminal
R /V
L
Low terminal
V
and the maximum is V . The terminology of R /
CC
L
SS
V
V
Ground
SS
V and R /V references the relative position of the
L
H
H
Supply voltage
terminal in relation to wiper movement direction
selected by the U/D input, and not the voltage potential
on the terminal.
CC
U/D
Up/Down control input
Increment control input
Chip select control input
INC
CS
RW/VW
R /V is the wiper terminal and is equivalent to the
W
w
PRINCIPLES OF OPERATION
movable terminal of a mechanical potentiometer. The
position of the wiper within the array is determined by
the control inputs. The wiper terminal series resistance
There are two sections of the X9015: the input control,
counter and decode section; and the resistor array.
The input control section operates just like an up/down
counter. The output of this counter is decoded to turn
on a single electronic switch connecting a point on the
resistor array to the wiper output. The resistor array is
comprised of 31 individual resistors connected in
series.
is typically 200Ω at V
= 5V. At power up the wiper
CC
position is at Tap #15. (V /R = Tap #0).
L
L
Up/Down (U/D)
The U/D input controls the direction of the wiper move-
ment and whether the tap position is incremented or
decremented.
The wiper, when at either fixed terminal, acts like its
mechanical equivalent and does not move beyond the
last position. That is, the counter does not wrap
around when clocked to either extreme.
Increment (INC)
The INC input is negative-edge triggered. Toggling
INC will move the wiper and either increment or decre-
ment the counter in the direction indicated by the logic
level on the U/D input.
The electronic switches on the device operate in a
“make before break” mode when the wiper changes
tap positions. If the wiper is moved several positions,
multiple taps are connected to the wiper for t (INC to
Chip Select (CS)
IW
V
change). The R
value for the device can tem-
W
TOTAL
The device is selected when the CS input is LOW.
When CS is returned HIGH while the INC input is also
HIGH the X9015 will be placed in the low power
standby mode until the device is selected once again.
porarily be reduced by a significant amount if the wiper
is moved several positions.
When the device is powered-down, the wiper position
is lost. When power is restored, the wiper is set to Tap
#15.
PIN CONFIGURATION
INSTRUCTIONS AND PROGRAMMING
SOIC/MSOP
The INC, U/D and CS inputs control the movement of
the wiper along the resistor array. With CS set LOW
the device is selected and enabled to respond to the
U/D and INC inputs. HIGH to LOW transitions on INC
will increment or decrement (depending on the state of
the U/D input) a five bit counter. The output of this
counter is decoded to select one of thirty two wiper
positions along the resistive array.
V
CC
INC
U/D
1
2
3
4
8
7
6
5
CS
R /V
X9015
R /V
H
H
L
L
V
R
/V
W
SS
W
Characteristics subject to change without notice. 2 of 12
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X9015
The system may select the X9015, move the wiper
and deselect the device.The new wiper position will be
maintained until changed by the system or until a
power-up/down cycle.
SYMBOL TABLE
WAVEFORM
INPUTS
OUTPUTS
The state of U/D may be changed while CS remains
LOW. This allows the host system to enable the device
and then move the wiper up and down until the proper
trim is attained.
Must be
steady
Will be
steady
May change
from Low to
High
Will change
from Low to
High
May change
from High to
Low
Will change
from High to
Low
MODE SELECTION
CS
L
INC
U/D
H
Mode
Don’t Care:
Changes
Allowed
Changing:
State Not
Known
Wiper up
L
L
Wiper down
N/A
Center Line
is High
Impedance
*
H
L
X
Standby mode
Normal mode
L
X
Characteristics subject to change without notice. 3 of 12
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X9015
ABSOLUTE MAXIMUM RATINGS
COMMENT
Temperature under bias ....................–65°C to +135°C
Storage temperature .........................–65°C to +150°C
Stresses above those listed under “Absolute Maximum
Ratings” may cause permanent damage to the device.
This is a stress rating only; functional operation of the
device (at these or any other conditions above those
listed in the operational sections of this specification)
is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reli-
ability.
Voltage on CS, INC, U/D, V , V and
H
L
V
with respect to V .........................–1V to +7V
CC
SS
∆V = |V –V |........................................................... 5V
H
L
Lead temperature (soldering 10 seconds)..........300°C
I
(10 seconds) .............................................. ±7.5mA
W
RECOMMENDED OPERATING CONDITIONS
Temperature
Commercial
Industrial
Min.
0°C
Max.
+70°C
+85°C
Supply Voltage (V
X9015
)
Limits
5V ±10%
CC
–40°C
X9015-2.7
2.7V to 5.5V
POTENTIOMETER CHARACTERISTICS (Over recommended operating conditions unless otherwise stated.)
Limits
Symbol
Parameter
Min.
–20
0
Typ.
Max. Units
Test Conditions/Notes
R
End to End Resistance Variation
+20
%
V
TOTAL
V
V /R Terminal Voltage
V
V
VH
H
H
CC
V
V /R Terminal Voltage
0
V
VL
L
L
CC
Power Rating
Wiper Resistance
Wiper Resistance
Wiper Current
Noise
10
mW
Ω
R
≤ 1 KΩ
TOTAL
R
R
200
400
400
I
I
= 1mA, V = 5V
CC
W
W
W
1000
3.75
Ω
= 1mA, V = 2.7V
CC
W
I
-3.75
mA
dBV
%
W
-120
3
Ref: 1kHz
Resolution
Absolute Linearity(1)
Relative Linearity(2)
-1
+1
MI(3)
MI(3)
ppm/°C
V
– V
w(n)(actual)
w(n)(expected)
]
-0.2
+0.2
V
– [V
w(n+1) w(n)+MI
R
Temperature Coefficient
±300
TOTAL
Ratiometric Temperature Coefficient
Potentiometer Capacitances
±20 ppm/°C
pF See circuit #3
C /C /C
W
10/10/25
H
L
Notes: (1) Absolute Linearity is utilized to determine actual wiper voltage versus expected voltage = (V
(actual) – V
(expected)) = ±1 Ml
w(n)
w(n)
Maximum.
(2) Relative Linearity is a measure of the error in step size between taps = V
– [V
+ Ml] = ±0.2 Ml.
w(n)
W(n+1)
(3) 1 Ml = Minimum Increment = R
/31.
TOT
(4) Typical values are for T = 25°C and nominal supply voltage.
A
(5) This parameter is periodically sampled and not 100% tested.
Characteristics subject to change without notice. 4 of 12
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X9015
D.C. OPERATING CHARACTERISTICS (Over recommended operating conditions unless otherwise specified)
Limits
(4)
Typ.
Symbol
Parameter
Min.
Max.
Units
Test Conditions
I
V
V
active current (increment)
50
µA
CS = V , U/D = V or V and
CC
CC1
IL
IL
IH
INC = 0.4V @ max. t
CYC
I
active current (Store) (EE-
400
1
µA
µA
µA
CS = V , U/D = V or V and
IH IL IH
CC
CC2
PROM Store)
INC = V @ max. t
IH WR
I
Standby supply current
CS = V – 0.3V, U/D and INC
CC
SB
= V or V – 0.3V
SS
CC
I
CS, INC, U/D input leakage
current
±10
V
= V to V
SS CC
LI
IN
V
CS, INC, U/D input HIGH voltage
CS, INC, U/D input LOW voltage
CS, INC, U/D input capacitance
V
x 0.7
V + 0.5
CC
V
V
IH
CC
V
–0.5
V
x 0.1
IL
(5)
CC
C
10
pF
V
= 5V, V = V , T = 25°C,
CC IN SS A
IN
f = 1MHz
Test Circuit #1
Test Circuit #2
Circuit #3 SPICE Macro Model
R
V /R
H
TOTAL
H
V /R
H
H
R
R
L
H
Test Point
C
L
C
W
C
H
10pF
V
S
Test Point
/R
V
/R
Force
Current
W
W
25pF
V
W
W
10pF
V /R
L
L
V /R
R
L
L
W
Characteristics subject to change without notice. 5 of 12
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X9015
A.C. CONDITIONS OF TEST
A.C. OPERATING CHARACTERISTICS (Over recom-
mended operating conditions unless otherwise speci-
fied)
Input pulse levels
0V to 3V
Input rise and fall times
Input reference levels
10ns
1.5V
Limits
(6)
Symbol
Parameter
Min.
100
100
2.9
1
Typ.
Max.
Units
ns
t
t
CS to INC setup
Cl
lD
DI
INC HIGH to U/D change
U/D to INC setup
ns
t
µs
t
INC LOW period
µs
lL
lH
lC
t
t
INC HIGH period
1
µs
INC inactive to CS inactive
CS deselect time (NO STORE)
CS deselect time (STORE)
INC to Vw change
1
µs
t
t
100
10
ns
CPH
ms
µs
CPH
t
1
5
5
IW
t
INC cycle time
4
µs
CYC
(7)
t
t
INC input rise and fall time
Power up to wiper stable
500
5
µs
,
R
F
(7)
t
PU
µs
(7)
t V
V
CC
power-up rate
0.2
50
10
V/ms
ms
R
CC
t
Store cycle
WR
A.C. TIMING
CS
t
CYC
(store)
t
t
t
t
t
CI
IL
IH
IC
CPH
90% 90%
10%
INC
t
t
t
t
R
ID
DI
F
U/D
t
IW
(8)
MI
V
W
Notes: (6) Typical values are for T = 25°C and nominal supply voltage.
A
(7) This parameter is periodically sampled and not 100% tested.
(8) MI in the A.C. timing diagram refers to the minimum incremental change in the V output due to a change in the wiper position.
W
Characteristics subject to change without notice. 6 of 12
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X9015
PERFORMANCE CHARACTERISTICS (TYPICAL)
Typical Noise
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
0
10
20 30
40 50
60 70
80 90 100 110 120 130 140 150 160 170 180 190 200
Frequency (kHz)
Typical Rtotal vs. Temperature
10000
9800
9600
9400
9200
9000
8800
8600
8400
8200
8000
-55
-45
-35 -25 -15 -5
5
35 45
C°
95 105 115 125
15
25
55 65
75
85
Temperature
Typical Total Resistance Temperature Coefficient
0
-50
-100
-150
PPM
-200
-250
-300
-350
-55 -45 -35 -25 -15
-5
5
15
25
35
45
55
65
75
85
95 105 115 125 °C
Temperature
Characteristics subject to change without notice. 7 of 12
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X9015
Typical Wiper Resistance
800
700
600
500
400
300
200
100
0
0
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
V
= 2.7V
CC
Tap
Typical Absolute% Error per Tap Position
40.0%
30.0%
20.0%
10.0%
0.0%
-10.0%
-20.0%
-30.0%
-40.0%
0
3
6
9
12
15
18
21
24
27
30
Tap
Typical Relative% Error per Tap Position
20.0%
15.0%
10.0%
5.0%
0.0%
-5.0%
-10.0%
-15.0%
-20.0%
0
3
6
9
12
15
18
21
24
27
30
Tap
Characteristics subject to change without notice. 8 of 12
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X9015
APPLICATIONS INFORMATION
Electronic digitally controlled potentiometers provide two powerful application advantages; (1) the variability and
reliability of a solid-state potentiometer, and (2) the flexibility of computer-based digital controls.
Basic Configurations of Electronic Potentiometers
V
R
V
R
V /R
H
H
V
/R
W
W
V /R
L
L
I
Three terminal potentiometer;
variable voltage divider
Two terminal variable resistor;
variable current
Basic Circuits
Noninverting Amplifier
Buffered Reference Voltage
Cascading Techniques
R
1
+5V
+V
+V
LM308A
+V
V
+
–
S
+5V
V
O
V
/R
OP-07
W
W
V
+
–
V
REF
–5V
X
V
OUT
V
/R
W
W
R
2
+V
–5V
= V
R
1
V
/R
W
W
OUT
W
(a)
(b)
V
= (1+R /R )V
2 1 S
O
Voltage Regulator
Offset Voltage Adjustment
Comparator with Hysteresis
R
R
2
1
V
V (REG)
O
317
IN
LT311A
V
S
V
–
+
S
V
O
R
1
100KΩ
–
+
V
O
I
adj
TL072
R
2
10KΩ
10KΩ
+12V
R
R
1
2
V
V
= {R /(R +R )} V (max)
1 1 2 O
UL
LL
10KΩ
-12V
= {R /(R +R )} V (min)
1 1 2 O
V
(REG) = 1.25V (1+R /R )+I
R
adj 2
O
2
1
(for additional circuits see AN115)
Characteristics subject to change without notice. 9 of 12
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X9015
MSOP PACKAGING INFORMATION
8-Lead Miniature Small Outline Gull Wing Package Type M
0.118 ± 0.002
(3.00 ± 0.05)
0.012 + 0.006 / -0.002
(0.30 + 0.15 / -0.05)
0.0256 (0.65) Typ.
R 0.014 (0.36)
0.118 ± 0.002
(3.00 ± 0.05)
0.030 (0.76)
0.0216 (0.55)
7° Typ.
0.036 (0.91)
0.032 (0.81)
0.040 ± 0.002
(1.02 ± 0.05)
0.008 (0.20)
0.004 (0.10)
0.0256" Typical
0.025"
Typical
0.150 (3.81)
0.007 (0.18)
0.005 (0.13)
Ref.
0.193 (4.90)
Ref.
0.220"
0.020"
Typical
8 Places
FOOTPRINT
NOTE:
1. ALL DIMENSIONS IN INCHES AND (MILLIMETERS)
Characteristics subject to change without notice. 10 of 12
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X9015
SOIC PACKAGING INFORMATION
8-Lead Plastic Small Outline Gull Wing Package Type S
0.150 (3.80) 0.228 (5.80)
0.158 (4.00) 0.244 (6.20)
Pin 1 Index
Pin 1
0.014 (0.35)
0.019 (0.49)
0.188 (4.78)
0.197 (5.00)
(4X) 7°
0.053 (1.35)
0.069 (1.75)
0.004 (0.19)
0.010 (0.25)
0.050 (1.27)
0.010 (0.25)
0.050"Typical
X 45°
0.020 (0.50)
0.050"
Typical
0° - 8°
0.0075 (0.19)
0.010 (0.25)
0.250"
0.016 (0.410)
0.037 (0.937)
0.030"
Typical
8 Places
FOOTPRINT
NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS)
Characteristics subject to change without notice. 11 of 12
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X9015
ORDERING INFORMATION
X9015
X
X
X
X
V
Limits
CC
–2.7 = 2.7V to 5.5V
Temperature Range
Blank = Commercial = 0°C to +70°C
I = Industrial = –40°C to +85°C
Package
S8 = 8-Lead SOIC
M8 = 8-Lead MSOP
End to End Resistance
W =10KΩ
U = 50KΩ
T = 100KΩ
Physical Characteristics
Marking Includes
Manufacturer’s Trademark
Resistance Value or Code
Date Code
©Xicor, Inc. 2000 Patents Pending
LIMITED WARRANTY
Devices sold by Xicor, Inc. are covered by the warranty and patent indemnification provisions appearing in its Terms of Sale only. Xicor, Inc. makes no warranty,
express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement.
Xicor, Inc. makes no warranty of merchantability or fitness for any purpose. Xicor, Inc. reserves the right to discontinue production and change specifications and prices
at any time and without notice.
Xicor, Inc. assumes no responsibility for the use of any circuitry other than circuitry embodied in a Xicor, Inc. product. No other circuits, patents, or licenses are implied.
TRADEMARK DISCLAIMER:
Xicor and the Xicor logo are registered trademarks of Xicor, Inc. AutoStore, Direct Write, Block Lock, SerialFlash, MPS, and XDCP are also trademarks of Xicor, Inc. All
others belong to their respective owners.
U.S. PATENTS
Xicor products are covered by one or more of the following U.S. Patents: 4,326,134; 4,393,481; 4,404,475; 4,450,402; 4,486,769; 4,488,060; 4,520,461; 4,533,846;
4,599,706; 4,617,652; 4,668,932; 4,752,912; 4,829,482; 4,874,967; 4,883,976; 4,980,859; 5,012,132; 5,003,197; 5,023,694; 5,084,667; 5,153,880; 5,153,691;
5,161,137; 5,219,774; 5,270,927; 5,324,676; 5,434,396; 5,544,103; 5,587,573; 5,835,409; 5,977,585. Foreign patents and additional patents pending.
LIFE RELATED POLICY
In situations where semiconductor component failure may endanger life, system designers using this product should design the system with appropriate error detection
and correction, redundancy and back-up features to prevent such an occurrence.
Xicor’s products are not authorized for use in critical components in life support devices or systems.
1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to
perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user.
2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life
support device or system, or to affect its safety or effectiveness.
Characteristics subject to change without notice. 12 of 12
REV 1.0 6/26/00
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