MAX5389MAUD+T [MAXIM]
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| 型号： | MAX5389MAUD+T |
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MAXIM INTEGRATED PRODUCTS |
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19-5141; Rev 1; 4/10
Dual, 256-Tap, Volatile, Low-Voltage
Linear Taper Digital Potentiometer
General Description
Features
S Dual, 256-Tap Linear Taper Positions
The MAX5389 dual, 256-tap, volatile, low-voltage lin-
ear taper digital potentiometer offers three end-to-end
resistance values of 10kI, 50kI, and 100kI. Operating
from a single +2.6V to +5.5V power supply, the device
provides a low 35ppm/NC end-to-end temperature coef-
ficient. The MAX5389 features an up/down interface.
S Single +2.6V to +5.5V Supply Operation
S Low (< 1µA) Quiescent Supply Current
S 10kI, 50kI, 100kI End-to-End Resistance Values
S Up/Down Interface
The small package size, low supply operating voltage,
low supply current, and automotive temperature range
of the MAX5389 make the device uniquely suited for the
portable consumer market, battery backup industrial
applications, and the automotive market.
S Power-On Sets Wiper to Midscale
S -40°C to +125NC Operating Temperature Range
The MAX5389 is specified over the automotive -40NC to
+125NC temperature range and is available in a 14-pin
TSSOP package.
Ordering Information
END-TO-END
PART
PIN-PACKAGE
RESISTANCE (kI)
MAX5389LAUD+
MAX5389MAUD+
MAX5389NAUD+
14 TSSOP
14 TSSOP
14 TSSOP
10
50
Applications
Audio Mixing
100
Note: All devices are specified over the -40NC to +125NC oper-
ating temperature range
+Denotes a lead(Pb)-free/RoHS-compliant package.
Mechanical Potentiometer Replacement
Low-Drift Programmable Filters and Amplifiers
Adjustable Voltage References/Linear Regulators
Programmable Delays and Time Constants
Automotive Electronics
Functional Diagram
Low-Voltage Battery Applications
V
HA
WA
LA
DD
CSA
UDA
INCA
CSB
MAX5389
HB
256 DECODER
256 DECODER
LATCH
U/D
WB
POR
UDB
INCB
LB
LATCH
GND
_______________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Dual, 256-Tap, Volatile, Low-Voltage
Linear Taper Digital Potentiometer
ABSOLUTE MAXIMUM RATINGS
DD
H_, W_, L_ to GND......................................-0.3V to the lower of
V
to GND ...........................................................-0.3V to +6V
Continuous Power Dissipation (T = +70NC)
A
14-Pin TSSOP (derate 10mW/NC above +70NC) ......796.8mW
Operating Temperature Range........................ -40NC to +125NC
Junction Temperature .....................................................+150NC
Storage Temperature Range............................ -65NC to +150NC
Lead Temperature (soldering, 10s) ................................+300NC
Soldering Temperature (reflow) ......................................+260NC
(V + 0.3V) and +6V
DD
All Other Pins to GND .............................................-0.3V to +6V
Continuous Current into H_, W_, and L_
MAX5389L......................................................................... Q5mA
MAX5389M........................................................................ Q2mA
MAX5389N ........................................................................ Q1mA
Stresses beyond 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 beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V
DD
= +2.6V to +5.5V, V
= V , V
= GND, T = -40NC to +125NC, unless otherwise noted. Typical values are at V
= +5V,
H__
DD L__
A
DD
T
A
= +25NC.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Resolution
N
256
Taps
DC PERFORMANCE (Voltage-Divider Mode)
Integral Nonlinearity
INL
(Note 2)
(Note 2)
-0.5
-0.5
-0.5
+0.5
+0.5
+0.5
LSB
LSB
LSB
LSB
Differential Nonlinearity
Dual Code Matching
DNL
Register A = register B
(DV /V )/DT, no load
Ratiometric Resistor Tempco
+5
-2.5
W
W
MAX5389L
MAX5389M
MAX5389N
MAX5389L
MAX5389M
MAX5389N
-3
-1
Full-Scale Error
Zero-Scale Error
Code = FFH
Code = 00H
-0.5
LSB
LSB
-0.5
-0.25
+2.5
+0.5
+0.25
+3
+1.0
+0.5
DC PERFORMANCE (Variable-Resistor Mode) (Note 3)
MAX5389L
MAX5389M
MAX5389N
MAX5389L
MAX5389M
MAX5389N
1.0
0.5
2.5
1.0
V
> +2.6V
DD
0.25
0.4
0.8
Integral Nonlinearity
R-INL
LSB
1.5
V
V
> +4.75V
≥ 2.6V
0.3
0.75
0.5
DD
DD
0.25
Differential Nonlinearity
R-DNL
-0.5
+0.5
LSB
DC PERFORMANCE (Resistor Characteristics)
V
> 2.6V
250
150
10
600
200
DD
Wiper Resistance (Note 4)
R
I
WL
V
DD
> 4.75V
Terminal Capacitance
C _, C _ Measured to GND
pF
pF
H
L _
Wiper Capacitance
C _
Measured to GND
No load
50
W
End-to-End Resistor Tempco
End-to-End Resistor Tolerance
TC
35
ppm/NC
%
R
DR
Wiper not connected
-25
+25
HL
2
______________________________________________________________________________________
Dual, 256-Tap, Volatile, Low-Voltage
Linear Taper Digital Potentiometer
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +2.6V to +5.5V, V
= V , V
= GND, T = -40NC to +125NC, unless otherwise noted. Typical values are at V
= +5V,
H__
DD L__
A
DD
T
= +25NC.) (Note 1)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
dB
AC PERFORMANCE
Crosstalk
(Note 5)
-90
600
150
75
MAX5389L
MAX5389M
MAX5389N
Code = 80H, 10pF load,
= +2.6V
-3dB Bandwidth
BW
kHz
V
DD
Total Harmonic Distortion Plus
Noise
THD+N Measured at W, V _ = 1V
H
at 1kHz
0.015
%
RMS
MAX5389L
300
1000
2000
Wiper Settling Time (Note 6)
t
S
MAX5389M
MAX5389N
ns
POWER SUPPLIES
Supply Voltage Range
Standby Current
V
2.6
5.5
V
DD
Digital inputs = V
or GND
1
5
FA
DD
DIGITAL INPUTS
Minimum Input High Voltage
Maximum Input Low Voltage
Input Leakage Current
Input Capacitance
V
70
-1
% x V
% x V
FA
IH
DD
V
30
+1
IL
DD
pF
TIMING CHARACTERISTICS (Note 7)
Maximum INC_ Frequency
CS to INC_ Setup Time
CS to INC_ Hold Time
INC_ Low Period
f
10
MHz
ns
MAX
t
CI
25
0
t
IC
ns
t
IL
25
25
50
0
ns
t
IH
ns
INC_ High Period
t
DI
ns
UD_ to INC_ Setup Time
UD_ to INC_ Hold Time
t
ID
ns
Note 1: All devices are 100% production tested at T = +25NC. Specifications over temperature limits are guaranteed by design
A
and characterization.
Note 2: DNL and INL are measured with the potentiometer configured as a voltage-divider (Figure 1) with H_ = V
and L_ = 0V.
DD
The wiper terminal is unloaded and measured with a high-input-impedance voltmeter.
Note 3: R-DNL and R-INL are measured with the potentiometer configured as a variable resistor (Figure 1). DNL and INL are mea-
sured with potentiometer configured as a variable resistor. H_ is unconnected and L_ = GND. For V = +5V, the wiper
DD
terminal is driven with a source current of 400µA for the 10kω configuration, 80µA for the 50kω configuration, and 40µA for
the 100kω configuration. For V = +2.6V, the wiper terminal is driven with a source current of 200µA for the 10kω configu-
DD
ration, 40µA for the 50kω configuration, and 20µA for the 100kω configuration.
Note 4: The wiper resistance is the worst value measured by injecting the currents given in Note 3 into W_ with L_ = GND. R
=
W
(V – V )/I .
W
H
W
Note 5: Drive HA with a 1kHz, GND to V
amplitude, tone. LA = LB = GND. No load. WB is at midscale with a 10pF load. Measure
DD
WB.
Note 6: The wiper-settling time is the worst case 0 to 50% rise time, measured between tap 0 and tap 127. H_ = V , L_ = GND,
DD
and the wiper terminal is loaded with 10pF capacitance to ground.
Note 7: Digital timing is guaranteed by design and characterization, not production tested.
_______________________________________________________________________________________
3
Dual, 256-Tap, Volatile, Low-Voltage
Linear Taper Digital Potentiometer
H
N.C.
W
W
L
L
Figure 1. Voltage-Divider and Variable Resistor Configurations
Typical Operating Characteristics
(V
= +5V, T = +25°C, unless otherwise noted.)
A
DD
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
SUPPLY CURRENT
vs. TEMPERATURE
SUPPLY CURRENT
vs. DIGITAL INPUT VOLTAGE
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
1.0
10,000
1000
100
10
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
V
= 5V
DD
V
= 5V
DD
V
= 2.6V
DD
V
DD
= 2.6V
1
0.1
2.6
3.1
3.6
4.1
(V)
4.6
5.1
-40 -25 -10
5
20 35 50 65 80 95 110 125
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
DIGITAL INPUT VOLTAGE (V)
V
TEMPERATURE (°C)
DD
RESISTANCE (W-TO-L)
vs. TAP POSITION (10kI)
RESISTANCE (W-TO-L)
vs. TAP POSITION (50kI)
RESISTANCE (W-TO-L)
vs. TAP POSITION (100kI)
11
10
9
55
50
45
40
35
30
25
20
15
10
5
110
100
90
80
70
60
50
40
30
20
10
0
8
7
6
5
4
3
2
1
0
0
0
51
102
153
204
255
0
51
102
153
204
255
0
51
102
153
204
255
TAP POSITION
TAP POSITION
TAP POSITION
4
______________________________________________________________________________________
Dual, 256-Tap, Volatile, Low-Voltage
Linear Taper Digital Potentiometer
Typical Operating Characteristics (continued)
(V
= +5V, T = +25°C, unless otherwise noted.)
A
DD
END-TO-END RESISTANCE % CHANGE
vs. TEMPERATURE
VARIABLE-RESISTOR DNL
vs. TAP POSITION (10kI)
WIPER RESISTANCE
vs. WIPER VOLTAGE (10kI)
210
0.1
0
0.10
0.08
0.06
0.04
0.02
0
10kI
I
= 400µA
WIPER
V
= 2.6V
190
170
150
130
110
90
DD
-0.1
-0.2
-0.3
-0.4
-0.5
50kI
V
= 5V
DD
100kI
-0.02
-0.04
-0.06
-0.08
-0.10
70
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
WIPER VOLTAGE (V)
-40 -25 -10
5
20 35 50 65 80 95 110 125
0
0
0
51
102
153
204
255
255
255
TEMPERATURE (NC)
TAP POSITION
VARIABLE-RESISTOR DNL
vs. TAP POSITION (50kI)
VARIABLE-RESISTOR DNL
vs. TAP POSITION (100kI)
VARIABLE-RESISTOR INL
vs. TAP POSITION (10kI)
0.10
0.08
0.06
0.04
0.02
0
0.10
0.08
0.06
0.04
0.02
0
1.0
0.8
I
= 80µA
I
= 400µA
I
= 400µA
WIPER
WIPER
WIPER
0.6
0.4
0.2
0
-0.02
-0.04
-0.06
-0.08
-0.10
-0.02
-0.04
-0.06
-0.08
-0.10
-0.2
-0.4
-0.6
-0.8
-1.0
0
51
102
153
204
255
0
51
102
153
204
255
51
102
153
204
TAP POSITION
TAP POSITION
TAP POSITION
VARIABLE-RESISTOR INL
vs. TAP POSITION (50kI)
VARIABLE-RESISTOR INL
vs. TAP POSITION (100kI)
VOLTAGE-DIVIDER DNL
vs. TAP POSITION (10kI)
0.5
0.4
0.5
0.4
0.10
0.08
0.06
0.04
0.02
0
I
= 80µA
I
= 400µA
WIPER
WIPER
0.3
0.3
0.2
0.2
0.1
0.1
0
0
-0.1
-0.2
-0.3
-0.4
-0.5
-0.1
-0.2
-0.3
-0.4
-0.5
-0.02
-0.04
-0.06
-0.08
-0.10
0
51
102
153
204
255
0
51
102
153
204
255
51
102
153
204
TAP POSITION
TAP POSITION
TAP POSITION
_______________________________________________________________________________________
5
Dual, 256-Tap, Volatile, Low-Voltage
Linear Taper Digital Potentiometer
Typical Operating Characteristics (continued)
(V
= +5V, T = +25°C, unless otherwise noted.)
A
DD
VOLTAGE-DIVIDER DNL
vs. TAP POSITION (50kI)
VOLTAGE-DIVIDER DNL
vs. TAP POSITION (100kI)
VOLTAGE-DIVIDER INL
vs. TAP POSITION (10kI)
0.10
0.10
0.08
0.06
0.04
0.02
0
0.5
0.4
0.08
0.06
0.04
0.02
0
0.3
0.2
0.1
0
-0.02
-0.04
-0.06
-0.08
-0.10
-0.02
-0.04
-0.06
-0.08
-0.10
-0.1
-0.2
-0.3
-0.4
-0.5
0
51
102
153
204
255
0
51
102
153
204
255
0
51
102
153
204
255
TAP POSITION
TAP POSITION
TAP POSITION
VOLTAGE-DIVIDER INL
vs. TAP POSITION (50kI)
VOLTAGE-DIVIDER INL
vs. TAP POSITION (100kI)
TAP-TO-TAP SWITCHING TRANSIENT
(CODE 127 TO 128) 10kI
MAX5389 toc21
0.5
0.4
0.5
0.4
V
W-L
20mV/div
0.3
0.3
0.2
0.2
0.1
0.1
0
0
-0.1
-0.2
-0.3
-0.4
-0.5
-0.1
-0.2
-0.3
-0.4
-0.5
INC
5V/div
400ns/div
0
51
102
153
204
255
0
51
102
153
204
255
TAP POSITION
TAP POSITION
6
______________________________________________________________________________________
Dual, 256-Tap, Volatile, Low-Voltage
Linear Taper Digital Potentiometer
Typical Operating Characteristics (continued)
(V
= +5V, T = +25°C, unless otherwise noted.)
A
DD
TAP-TO-TAP SWITCHING TRANSIENT
TAP-TO-TAP SWITCHING TRANSIENT
POWER-ON WIPER TRANSIENT
(CODE 0 TO 128)
MAX5389 toc24
(CODE 127 TO 128) 50kI
(CODE 127 TO 128) 100kI
MAX5389 toc22
MAX5389 toc23
V
W-L
V
20mV/div
W-L
20mV/div
OUTPUT W
2V/div
INC
V
DD
5V/div
2V/div
INC
5V/div
400ns/div
1µs/div
2µs/div
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
0.14
MIDSCALE FREQUENCY RESPONSE
CROSSTALK vs. FREQUENCY
10
0
-20
V
C
= 1V
P-P
= 10pF
IN
W
0.12
0.10
0.08
0.06
0.04
0.02
0
MAX5389M
0
-10
-20
-30
MAX5389L
-40
-60
MAX5389L
MAX5389M
MAX5389N
-80
-100
-120
-140
MAX5389L
MAX5389N
MAX5389M
MAX5389N
0.01
0.1
1
10
100 1,000 10,000
0.01
0.1
1
10
100
1000
0.01
0.10
1
10
100
FREQUENCY (kHz)
FREQUENCY (kHz)
FREQUENCY (kHz)
_______________________________________________________________________________________
7
Dual, 256-Tap, Volatile, Low-Voltage
Linear Taper Digital Potentiometer
Pin Configuration
TOP VIEW
+
CSA
UDA
UDB
1
2
3
4
5
6
7
14 CSB
13 INCA
12 INCB
11 GND
10 WB
V
DD
MAX5389
WA
HA
LA
9
8
HB
LB
Pin Description
PIN
NAME
FUNCTION
1
CSA
Active-Low Register A Chip-Select Input. Drive CSA low to change wiper position WA through INCA and UDA.
Register A Up/Down Control Input. With UDA low, a high-to-low transition at INCA decrements the WA posi-
tion towards LA. With UDA high, a high-to-low transition at INCA increments WA position toward HA.
2
3
UDA
UDB
Register B Up/Down Control Input. With UDB low, a high-to-low transition at INCB decrements the WB posi-
tion towards LB. With UDB high, a high-to-low transition at INCB increments WB position toward HB.
4
5
V
Power-Supply Input. Bypass V
to GND with a 0.1FF capacitor close to the device.
DD
DD
WA
Resistor A Wiper Terminal
Resistor A High Terminal. The voltage at HA can be higher or lower than the voltage at LA. Current can flow
into or out of HA.
6
7
8
9
HA
Resistor A Low Terminal. The voltage at LA can be higher or lower than the voltage at HA. Current can flow
into or out of LA.
LA
LB
HB
Resistor B Low Terminal. The voltage at LB can be higher or lower than the voltage at HB. Current can flow
into or out of LB.
Resistor B High Terminal. The voltage at HB can be higher or lower than the voltage at LB. Current can flow
into or out of HB.
10
11
WB
Resistor B Wiper Terminal
Ground
GND
Register B Wiper Increment Control Input. With UDB low, a high-to-low transition at INCB decrements the
WB position towards LB. With UDB high, a high-to-low transition at INCB increments WB position toward HB.
12
INCB
Register A Wiper Increment Control Input. With UDA low, a high-to-low transition at INCA decrements the
WA position towards LA. With UDA high, a high-to-low transition at INCA increments WA position toward HA.
13
14
INCA
CSB
Active-Low Register B Chip-Select Input. Drive CSB low to change wiper position WA through INCB and UDB.
8
______________________________________________________________________________________
Dual, 256-Tap, Volatile, Low-Voltage
Linear Taper Digital Potentiometer
and moves the tap point, W_ closer to L_, (Figure 2). The
wiper performs a make-before-break transition ensuring
Detailed Description
The MAX5389 dual, 256-tap, volatile, low-voltage linear
that W_ is never disconnected from the resistor string
during a transition from one tap point to another. When
the wiper is at either end of the resistor array additional
transitions in the direction of the end point do not change
the counter value.
taper digital potentiometer offers three end-to-end resis-
tance values of 10kI, 50kI, and 100kI. The potenti-
ometer consists of 255 fixed resistors in series between
terminals H_ and L_. The potentiometer wiper, W_, is
programmable to access any one of the 256 tap points
on the resistor string. On power-up, the wiper position is
set to midscale (tap 128).
Table 1. Up/Down Control Table
UD_
W_
CS_
H
INC_
X
The potentiometers are programmable independent of
each other. The MAX5389 features an up/down interface.
X
No change
No change
No change
Decrement
Increment
á
L
L
Up/Down Interface
Logic inputs CS_, UD_, and INC_ determine the wiper
position of the device (Table 1). With CS_ low and UD_
high, a high-to-low (falling edge) transition on INC_
increments the internal counter which moves the wiper,
W_, closer to H_. When both CS_ and UD_ are low, the
falling edge of INC_ decrements the internal counter
á
L
H
â
L
L
â
L
H
X = Don’t care.
↑ = Low-to-high transition.
↓ = High-to-low transition.
CS_
t
CI
t
IC
t
IL
INC_
t
IH
t
DI
t
ID
UD_
W_
t
IW
Figure 2. Up/Down Interface Timing Diagram
_______________________________________________________________________________________
9
Dual, 256-Tap, Volatile, Low-Voltage
Linear Taper Digital Potentiometer
Adjustable Dual Linear Regulator
Figure 5 shows an adjustable dual linear regulator using
a dual potentiometer as two variable resistors.
Applications Information
Variable Gain Amplifier
Figure 3 shows a potentiometer adjusting the gain of a
noninverting amplifier. Figure 4 shows a potentiometer
adjusting the gain of an inverting amplifier.
Adjustable Voltage Reference
Figure 6 shows an adjustable voltage reference circuit
using a potentiometer as a voltage-divider.
V
V
OUT1
OUT1
OUT2
OUT2
V
IN
H
L
H
L
V
OUT
MAX8866
V+
IN
W
W
W
SET1
SET2
L
H
Figure 3. Variable Gain Noninverting Amplifier
Figure 5. Adjustable Dual Linear Regulator
+5V
IN
H
L
V
REF
OUT
H
W
W
MAX6160
V
IN
V
OUT
L
GND
Figure 6. Adjustable Voltage Reference
Figure 4. Variable Gain Inverting Amplifier
10 _____________________________________________________________________________________
Dual, 256-Tap, Volatile, Low-Voltage
Linear Taper Digital Potentiometer
Variable Gain Current to Voltage Converter
Figure 7 shows a variable gain current to voltage con-
verter using a potentiometer as a variable resistor.
Programmable Filter
Figure 10 shows a programmable filter using a dual
potentiometer.
LCD Bias Control
Figure 8 shows a positive LCD bias control circuit using
a potentiometer as a voltage-divider.
Offset Voltage Adjustment Circuit
Figure 11 shows an offset voltage adjustment circuit
using a dual potentiometer.
Figure 9 shows a positive LCD bias control circuit using
a potentiometer as a variable resistor
+5V
R3
H
H
W
R1
R2
W
I
S
L
V
OUT
V
OUT
L
V
= I x ((R3 x (1 + R2/R1)) + R2)
S
OUT
Figure 7. Variable Gain I-to-V Converter
Figure 9. Positive LCD Bias Control Using a Variable Resistor
WB
V
IN
LB
+5V
H
HB
V
OUT
R3
W
R1
V
OUT
L
HA
LA
R2
WA
Figure 10. Programmable Filter
Figure 8. Positive LCD Bias Control Using a Voltage-Divide
______________________________________________________________________________________ 11
Dual, 256-Tap, Volatile, Low-Voltage
Linear Taper Digital Potentiometer
Process Information
+5V
PROCESS: BiCMOS
WA
LA
HA
Package Information
V
OUT
For the latest package outline information and land pat-
terns, go to www.maxim-ic.com/packages. Note that
a “+”, “#”, or “-” in the package code indicates RoHS
status only. Package drawings may show a different suf-
fix character, but the drawing pertains to the package
regardless of RoHS status.
HB
LB
PACKAGE TYPE PACKAGE CODE DOCUMENT NO.
WB
14 TSSOP
U14+1
21-0066
Figure 11. Offset Voltage Adjustment Circuit
12 _____________________________________________________________________________________
Dual, 256-Tap, Volatile, Low-Voltage
Linear Taper Digital Potentiometer
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
DESCRIPTION
CHANGED
0
1/10
Initial release
—
Added Soldering Temperature in Absolute Maximum Ratings; corrected
code in Conditions of -3dB Bandwidth specification in Electrical
Characteristics; corrected Table 1 and Figure 5
1
4/10
2, 3, 9, 10
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.
Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
13
©
2010 Maxim Integrated Products
Maxim is a registered trademark of Maxim Integrated Products, Inc.
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