MAX5403 [MAXIM]
Dual 256-Tap, Low-Drift, Digital Potentiometers in 10-レMAX; 双256抽头，低漂移， 10-数字电位レMAX
| 型号： | MAX5403 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Dual 256-Tap, Low-Drift, Digital Potentiometers in 10-レMAX |
| 文件： | 总10页 (文件大小：562K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1934; Rev 1; 4/01
Dual 256-Tap, Low-Drift,
Digital Potentiometers in 10-µMAX
General Description
Features
The MAX5403/MAX5404/MAX5405 is a family of dual
linear taper digital potentiometers. Each device has one
3-terminal potentiometer and one 2-terminal variable
resistor (Figure 1). The MAX5403/MAX5404/MAX5405
operate from +2.7V to +5.5V single-supply voltages
and use an ultra-low supply current of 0.1µA. These
devices also provide glitchless switching between
resistors taps as well as a convenient power-on reset
(POR) that sets the wiper to the midscale position at
power-up. The potentiometer consists of a fixed resistor
with a wiper contact that is digitally controlled through a
3-wire serial interface and has 256-tap points. It per-
forms the same function as a discrete potentiometer or
variable resistor.
o 10-Pin µMAX Small Footprint Package
o 256-Tap Positions
o Ultra Low 0.1µA Supply Current
o +2.7V to +5.5V Single-Supply Operation
o Low End-To-End Temperature Coefficient:
35ppm/°C
o Low Ratiometric Temperature Coefficient:
5ppm/°C
o Power-On Reset: Wiper Goes to Midscale
(Position 128)
o Glitchless Switching Between Resistor Taps
o 3-Wire SPI™ -Interface Compatible
o 10k /50k /100k Resistor Values
These parts are ideal for applications requiring digitally
controlled resistors. Three resistance values are avail-
able: 10k (MAX5403), 50k (MAX5404), and 100k
(MAX5405). A nominal resistor-temperature coefficient
of 35ppm/°C end-to-end and 5ppm/°C ratiometric make
the MAX5403/MAX5404/MAX5405 ideal for applications
requiring low temperature-coefficient variable resistors,
such as adjustable-gain circuit configurations.
The MAX5403/MAX5404/MAX5405 are available in a 10-
pin µMAX package. Each device is guaranteed over the
extended industrial temperature range (-40°C to +85°C).
Applications
Ordering Information
Mechanical Potentiometer Replacement
Low-Drift Programmable Gain Amplifier (PGA)
Volume Control
PART
TEMP RANGE
PIN-PACKAGE R (k )
MAX5403EUB -40 C to +85 C 10 µMAX
MAX5404EUB -40 C to +85 C 10 µMAX
MAX5405EUB -40 C to +85 C 10 µMAX
10
50
100
LCD Screen Adjustment
Adjustable Voltage Reference
Programmable Filters, Delays, Time Constant
Impedance Matching
Pin Configuration
TOP VIEW
GND
1
2
3
4
5
10
9
L
A
L
H
W
B
B
B
A
MAX5403
MAX5404
MAX5405
8
V
DD
W
7
SCLK
DIN
SPI is a registered trademark of Motorola, Inc.
CS
6
MAX
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Dual 256-Tap, Low-Drift,
Digital Potentiometers in 10-µMAX
ABSOLUTE MAXIMUM RATINGS
DD
V
to GND..............................................................-0.3V to +6V
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
DIN, SCLK, CS .........................................................-0.3V to +6V
H , L , W to GND .......................................-0.3V to (V + 0.3)
X
X
X
DD
Maximum Continuous Current Into H , L , and W ........... 1mA
X
X
X
Continuous Power Dissipation (T = +70°C)
A
10-Pin µMAX (derate 5.6mW/°C above +70°C)...........444mW
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
= +5V, unless otherwise noted. V = V , V = 0, T = T
to T
. Typical values are at V
= +5V, T = +25°C,
DD A
DD
H
DD
L
A
MIN
MAX
unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DC PERFORMANCE (Voltage Divider Mode)
Resolution
N
8
Bits
LSB
Integral Nonlinearity (Notes 1, 2)
Differential Nonlinearity (Notes 1, 2)
End-to-End Resistor Tempco
Ratiometric Resistor Tempco
Full-Scale Error
INL
DNL
1/2
1/2
LSB
TC
35
5
ppm/ C
ppm/ C
LSB
R
MAX5403
MAX5403
MAX5404
MAX5404
MAX5405
MAX5405
-8
Zero-Scale Error
+8
LSB
Full-Scale Error
-1.6
+1.6
-0.8
+0.8
LSB
Zero-Scale Error
LSB
Full-Scale Error
LSB
Zero-Scale Error
LSB
DC PERFORMANCE (Variable Resistor Mode)
Resolution
N
8
Bits
LSB
MAX5403 (Pot A)
MAX5403 (Pot B)
MAX5404
2.5
1
V
V
= +5V
= +3V
DD
DD
1
MAX5405
1
INL
Integral Nonlinearity (Notes 1, 3)
MAX5403 (Pot A)
MAX5403 (Pot B)
MAX5404
4.5
3
1.5
1.5
MAX5405
V
V
= +5V
= +3V
DD
DD
Differential Nonlinearity
(Notes 1, 3)
DNL
1/2
LSB
pF
DC PERFORMANCE (Resistor Characteristics)
V
V
= +5V
= +3V
275
DD
DD
Wiper Resistance (Note 4)
Wiper Capacitance
R
W
W
550
MAX5403
50
30
C
MAX5404/MAX5405
2
_______________________________________________________________________________________
Dual 256-Tap, Low-Drift,
Digital Potentiometers in 10-µMAX
ELECTRICAL CHARACTERISTICS (continued)
(V
= +5V, unless otherwise noted. V = V , V = 0, T = T
to T
. Typical values are at V
= +5V, T = +25°C,
DD A
DD
H
DD
L
A
MIN
MAX
unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
7.5
TYP
10
MAX
12.5
62.5
125
UNITS
MAX5403
MAX5404
MAX5405
End-to-End Resistance
R
HL
37.5
75
50
k
100
DIGITAL INPUTS
Input High Voltage
Input Low Voltage
Input Leakage Current
Input Capacitance
✕
V
0.7
V
V
V
IH
DD
✕
V
0.3
V
IL
DD
1.0
µA
pF
5
TIMING CHARACTERISTICS (ANALOG)
MAX5403
MAX5404
MAX5405
100
325
650
Wiper-Settling Time
t
ns
S
TIMING CHARACTERISTICS (DIGITAL) (Note 5)
Maximum SCLK Frequency
10
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
SCLK Clock Period
t
100
40
40
40
0
CP
SCLK Pulse Width High
SCLK Pulse Width Low
CS Fall to SCLK Rise Setup Time
SCLK Rise to CS Rise Hold Time
DIN Setup Time
t
CH
t
CL
t
CSS
CSH
t
t
40
0
DS
DH
DIN Hold Time
t
SCLK Rise to CS Fall Delay
CS Rise to SCLK Rise Hold
CS Pulse Width High
POWER SUPPLIES
t
t
10
40
100
CS0
CS1
t
CSW
Supply Voltage
V
2.7
5.5
5
V
DD
V
V
= +5V
0.8
0.1
µA
µA
DD
DD
Supply Current
I
CS = SCLK = DIN = V
DD
DD
= +2.7V
Note 1: Linearity is defined in terms of the H to L code-dependent resistance.
Note 2: The DNL and INL are measured with the potentiometer configured as a voltage divider with H = V
X
X
and L = 0. The wiper
X
X
DD
terminal is unloaded and measured with an ideal voltmeter.
Note 3: The DNL and INL are measured with the potentiometer configured as a variable resistor. For the 3-terminal potentiometer
(Pot A), H is unconnected and L = 0. For the 2-terminal potentiometer (Pot B), only L = 0. At V = +5V, the wiper termi-
A
A
B
DD
nal is driven with a source current of 400µA for the 10k configuration, 80µA for the 50k configuration, and 40µA for the
100k configuration. At V = +3V, 200µA/40µA/20µA for 10k /50k /100k configuration respectively.
DD
Note 4: The wiper resistance is the worst value measured by injecting into W , a current I = V
/ R
.
HL
X
W
DD
Note 5: Digital timing is guaranteed by design.
_______________________________________________________________________________________
3
Dual 256-Tap, Low-Drift,
Digital Potentiometers in 10-µMAX
Typical Operating Characteristics
(V
= +5.0V, T = +25°C, unless otherwise noted.)
DD
A
WIPER RESISTANCE vs.
WIPER VOLTAGE (100k
WIPER RESISTANCE vs.
WIPER-TO-END RESISTANCE
vs. WIPER VOLTAGE (10k )
)
WIPER VOLTAGE (50k
)
300
280
260
240
220
200
180
160
400
380
380
360
340
320
300
280
260
240
220
200
180
160
360
340
V
= +3V
DD
V
= +3V
V
= +3V
DD
DD
320
300
280
260
240
220
200
180
160
V
= +5V
DD
V
= +5V
DD
V
= +5V
DD
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
WIPER VOLTAGE (V)
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
WIPER VOLTAGE (V)
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
WIPER VOLTAGE (V)
WIPER-TO-END RESISTANCE
WIPER-TO-END RESISTANCE
WIPER-TO-END RESISTANCE
vs. INPUT CODE (10k
)
vs. INPUT CODE (100k
)
vs. INPUT CODE (50k
)
10
100
90
80
70
60
50
40
30
20
10
0
50
45
40
35
30
25
20
15
10
5
9
8
7
6
5
4
3
2
1
0
0
0
32 64 96 128 160 192 224 256
INPUT CODE (DECIMAL)
0
32 64 96 128 160 192 224 256
INPUT CODE (DECIMAL)
0
32 64 96 128 160 192 224 256
INPUT CODE (DECIMAL)
VARIABLE RESISTOR INL
VARIABLE RESISTOR DNL
VARIABLE RESISTOR DNL
vs. INPUT CODE (50k )
vs. INPUT CODE (10k
)
vs. INPUT CODE (10k
)
0.50
0.40
0.30
0.20
0.10
0.00
-0.10
-0.20
-0.30
0.20
0.15
0.10
0.05
0.00
-0.05
0.06
0.05
0.04
0.03
0.02
0.01
0.00
-0.01
-0.02
-0.03
V
= +5V
DD
0
32 64 96 128 160 192 224 256
INPUT CODE (DECIMAL)
0
32 64 96 128 160 192 224 256
INPUT CODE (DECIMAL)
0
32 64 96 128 160 192 224 256
INPUT CODE (DECIMAL)
4
_______________________________________________________________________________________
Dual 256-Tap, Low-Drift,
Digital Potentiometers in 10-µMAX
Typical Operating Characteristics (continued)
(V
= +5.0V, T = +25°C, unless otherwise noted.)
DD
A
VARIABLE RESISTOR INL
VARIABLE RESISTOR DNL
vs. INPUT CODE (100k
VARIABLE RESISTOR INL
vs. INPUT CODE (100k )
vs. INPUT CODE (50k
)
)
0.04
0.12
0.15
0.10
0.11
0.10
0.09
0.02
0.00
0.05
0.08
0.07
0.06
-0.02
-0.04
-0.06
-0.08
-0.10
-0.12
-0.14
-0.16
0.00
0.05
0.04
0.03
0.02
0.01
0.00
-0.05
-0.10
-0.15
-0.20
-0.01
-0.02
0
128 160
224 256
192
32 64 96
0
32
64 96 128 160 192 224 256
INPUT CODE (DECIMAL)
0
32
64 96 128 160 192 224 256
INPUT CODE (DECIMAL)
INPUT CODE (DECIMAL)
VOLTAGE-DIVIDER DNL
VOLTAGE-DIVIDER DNL
VOLTAGE-DIVIDER INL
vs. INPUT CODE (10k )
vs. INPUT CODE (50k
)
vs. INPUT CODE (10k
)
0.08
0.07
0.06
0.05
0.04
0.03
0.02
0.01
0.00
-0.01
-0.02
0.15
0.10
0.08
0.07
0.06
0.05
0.04
0.03
0.02
0.01
0.00
-0.01
-0.02
0.05
0.00
-0.05
-0.10
-0.15
-0.20
0
32
64 96 128 160 192 224 256
INPUT CODE (DECIMAL)
0
32
64 96 128 160 192 224 256
INPUT CODE (DECIMAL)
0
32
64 96 128 160 192 224 256
INPUT CODE (DECIMAL)
VOLTAGE-DIVIDER INL
vs. INPUT CODE (50k
VOLTAGE-DIVIDER DNL
vs. INPUT CODE (100k
VOLTAGE-DIVIDER INL
vs. INPUT CODE (100k )
)
)
0.15
0.10
0.15
0.10
0.08
0.07
0.06
0.05
0.04
0.03
0.02
0.01
0.00
-0.01
-0.02
0.05
0.05
0.00
0.00
-0.05
-0.10
-0.15
-0.20
-0.05
-0.10
-0.15
-0.20
0
32
64 96 128 160 192 224 256
INPUT CODE (DECIMAL)
0
32
64 96 128 160 192 224 256
INPUT CODE (DECIMAL)
0
32
64 96 128 160 192 224 256
INPUT CODE (DECIMAL)
_______________________________________________________________________________________
5
Dual 256-Tap, Low-Drift,
Digital Potentiometers in 10-µMAX
Typical Operating Characteristics (continued)
(V
= +5.0V, T = +25°C, unless otherwise noted.)
A
DD
SUPPLY CURRENT
vs. LOGIC INPUT VOLTAGE
SUPPLY CURRENT vs. TEMPERATURE
10
1
1.0
0.8
V
= +5V
DD
V
= +5V
DD
0.6
0.4
0.1
0.01
V
= +3V
DD
V
= +3V
DD
0.2
0
0.001
0.0001
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
INPUT LOGIC VOLTAGE (V)
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80
TEMPERATURE ( C)
END-TO-END RESISTANCE % CHANGE
vs. TEMPERATURE
TAP-TO-TAP SWITCHING TRANSIENT
(CODE 127 TO 128)
MAX5403 toc22
0.20
10k
50k
0.15
0.10
0.05
0
100k
V
W-L
50k
10mV/div
-0.05
-0.10
-0.15
-0.20
-0.25
100k
CS
5V/div
10k
-40 -20
0
20
40
60
80
200ns/div
TEMPERATURE ( C)
6
_______________________________________________________________________________________
Dual 256-Tap, Low-Drift,
Digital Potentiometers in 10-µMAX
Pin Description
PIN
1
NAME
FUNCTION
GND
Ground
2
L
Low Terminal of Resistor B
High Terminal of Resistor B
Wiper Terminal of Resistor B
SPI Chip Select
B
3
H
B
4
W
B
5
CS
DIN
6
SPI Serial Data Input
7
SCLK
SPI Clock Input
8
V
Power Supply, +2.7V to +5.5V. Connect a 0.1 F capacitor to GND.
Wiper Terminal of Resistor A
Low Terminal of Resistor A
DD
9
W
A
10
L
A
POR
MAX5403
V
DD
MAX5404
MAX5405
GND
W
A
R
R
8
8
8
256
256
8-BIT
LATCH
DECODE
DECODE
9-BIT
SHIFT
DIN
L
A
REGISTER
H
B
R
W
B
8-BIT
LATCH
L
B
SCLK
CS
SR
DECODE
Figure 1. MAX5403/MAX5404/MAX5405 Functional Diagram: 2-Terminal Variable Resistor and 3-Terminal Potentiometers in 10-µMAX
Configuration
allowing one or the other potentiometers to be selected
Detailed Description
for programming. The potentiometers are programmed
Each potentiometer consists of 255 fixed resistors in
independently of each other.
series between pins H and L for the 3-terminal
B
B
The MAX5403/MAX5404/MAX5405 use a 3-wire serial
data interface to control the wiper tap position. This
write-only interface contains three inputs: Chip Select
(CS), Data In (DIN), and Data Clock (SCLK). When CS
is taken low, data from the DIN pin is synchronously
loaded into the serial shift register on each rising edge
potentiometer and between W and L for the 2-termi-
A
A
nal variable resistor (Figure 1). The potentiometer wiper
(pin W ) can be programmed to access any one of the
X
256 different tap points on the resistor string. The
MAX5403/MAX5404/MAX5405 require nine bits to pro-
gram the wiper position. The 1st bit is an address code,
_______________________________________________________________________________________
7
Dual 256-Tap, Low-Drift,
Digital Potentiometers in 10-µMAX
POT REGISTER LOADED
CS
SCLK
1ST CLOCK PULSE
9TH CLOCK PULSE
DIN
A0
D7
D6
D5
D4
D3
D2
D1
D0
MSB
LSB
TIME
Figure 2. Potentiometer Serial Data Timing Circuit
CS
t
CSW
t
CS1
t
t
t
CH
CSO
CSS
t
CP
t
CSH
t
CL
SCLK
t
DS
t
DH
DIN
Figure 3. Detailed Serial Interface Timing Diagram
of each SCLK pulse (Figure 2). After all the data bits
have been shifted in, they are latched into the appropri-
ate potentiometer control register when CS transitions
from low to high. Note that if CS is not kept low during
the entire data stream, the data will be corrupted and
the device will need to be reloaded.
Adjustable Current to Voltage Converter
Figure 5 shows the MAX5403/MAX5404/MAX5405 being
used with a MAX4250 low-noise op amp to fine tune a
current to voltage converter. Pins H and W of the
B
B
MAX5403/MAX5404/MAX5405 3-terminal potentiometer
(only pin W of the 2-terminal variable resistor) are con-
A
nected to the node between R3 and R2 (pin L is con-
X
The first bit A0 (address bit) is used to address one or
the other of the potentiometers for programming.
Potentiometer control register A is selected for writing
when A0 is ‘zero’, and potentiometer control register B
is selected when A0 is one.
nected to ground). Circuit space is minimized due to
both devices’ packaging.
Adjustable Gain Amplifier
Figure 6 shows how to use the MAX5403/MAX5404/
MAX5405 to digitally adjust the gain of a noninverting op
amp configuration. In Figure 6a, connect the MAX5403/
MAX5404/MAX5405 as a 2-terminal variable resistor in
series with a resistor to ground to form the adjustable
gain control of a noninverting amplifier.
The MAX5403/MAX5404/MAX5405 feature POR circuitry
that sets the wiper to the midscale position at power-up.
Applications Information
The MAX5403/MAX5404/MAX5405 are intended for a
variety of circuits where accurate, fine-tuning adjustable
resistance is required, such as in adjustable voltage or
adjustable gain circuit configurations. It is primarily used
in either a potentiometer divider or a variable resistor
configuration.
Similarly, Figure 6b shows how to use the MAX5403/
MAX5404/MAX5405 as a 3-terminal potentiometer. In
this application the MAX5403/MAX5404/MAX5405 low
5ppm/°C ratiometric tempco allows for a very stable
adjustable gain-configuration overtemperature.
8
_______________________________________________________________________________________
Dual 256-Tap, Low-Drift,
Digital Potentiometers in 10-µMAX
ADDRESS
B0 (A0)
DATA WORD
B1 (D7)
B2 (D6)
B3 (D5)
B4 (D4)
B5 (D3)
B6 (D2)
B7 (D1)
B8 (D0)
(LSB)
(MSB)
First Bit In
Last Bit In
Figure 4. Serial Data Format
R3
W
A
V
CC
V
OUT
MAX5403
MAX5404
MAX5405
R2
R1
L
A
+5V
W
A
V
0
MAX5403
MAX5404
MAX5405
MAX4250
L
A
V / I = R (1 + R /R ) + R
0
S
3
2
1
2
Figure 5. I to V Converter
V
CC
Figure 6a. Adjustable Gain Circuit Using: 2-Terminal Variable
Resistor
V
IN
V
OUT
+5V
VIN
OUT
ADJ
V REF
O
H
W
B
B
✕
✕
✕
V REF = 12.3kV
O
/ (100k
/ (50k
C / 255) for MAX5403
MAX6160
GND
H
B
✕
V REF = 61.5kV
O
C / 255) for MAX5404
W
B
L
B
✕
✕
V REF = 123kV
O
/ (100k
C / 255) for MAX5405
WHERE C IS ANY CODE BEING WRITTEN TO A DEVICE.
L
B
MAX5403
MAX5404
MAX5405
Figure 7a. Adjustable Voltage Reference Using: 3-Terminal
Potentiometer
Figure 6b. Adjustable Gain Circuit Using: 3-Terminal
Potentiometer
pin of the MAX5403/MAX5404/MAX5405 is connected
to the ADJ pin of the MAX6160. The MAX5403/
MAX5404/MAX5405 allow precise setting of the voltage
reference output. A low 5ppm/°C ratiometric tempco
allows a very stable, adjustable voltage over tempera-
ture.
Adjustable Voltage Reference
In Figure 7a, the MAX5403/MAX5404/MAX5405 is
shown with the MAX6160 to make an adjustable volt-
age reference. In this circuit, the H pin of the
X
MAX5403/MAX5404/MAX5405 is connected to the OUT
pin of the MAX6160, the L pin of the MAX5403/
X
MAX5404/MAX5405 is connected to GND, and the W
X
_______________________________________________________________________________________
9
Dual 256-Tap, Low-Drift,
Digital Potentiometers in 10-µMAX
Chip Information
TRANSISTOR COUNT: 8689
PROCESS: BiCMOS
Package Information
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.
10 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2001 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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