MAX5496ETE+T [MAXIM]
Digital Potentiometer, 2 Func, 10000ohm, 3-wire Serial Control Interface, 1024 Positions, BICMOS, 5 X 5 MM, 0.80 MM HEIGHT, EXPOSED PAD, MO-220WHHB, TQFN-16;型号: | MAX5496ETE+T |
厂家: | MAXIM INTEGRATED PRODUCTS |
描述: | Digital Potentiometer, 2 Func, 10000ohm, 3-wire Serial Control Interface, 1024 Positions, BICMOS, 5 X 5 MM, 0.80 MM HEIGHT, EXPOSED PAD, MO-220WHHB, TQFN-16 电位器 |
文件: | 总20页 (文件大小:859K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
19-3562; Rev 1; 6/05
10-Bit, Dual, Nonvolatile, Linear-Taper
Digital Potentiometers
General Description
Features
♦ Wiper Position Stored in Nonvolatile Memory and
The MAX5494–MAX5499 10-bit (1024-tap), dual, non-
volatile, linear-taper, programmable voltage-dividers
and variable resistors perform the function of a
mechanical potentiometer, but replace the mechanics
with a 3-wire SPI™-compatible serial interface. The
MAX5494/MAX5495 are dual, 3-terminal, programma-
ble voltage-dividers; the MAX5496/MAX5497 are dual,
2-terminal variable resistors; and the MAX5498/
MAX5499 include one 2-terminal variable resistor and
one 3-terminal programmable voltage-divider.
Recalled Upon Power-Up
♦ 16-Pin, 5mm x 5mm x 0.8mm TQFN Package
♦ 35ppm/°C End-to-End Resistance Temperature
Coefficient
♦ 5ppm/°C Ratiometric Temperature Coefficient
♦ 10kΩ and 50kΩ End-to-End Resistor Values
♦ 3-Wire SPI-Compatible Serial Interface
The MAX5494–MAX5499 feature an internal, nonvolatile,
electrically erasable programmable read-only memory
(EEPROM) that stores the wiper position for initialization
during power-up. The 3-wire SPI-compatible serial inter-
face allows communication at data rates up to 7MHz.
♦ Reliability (T = +85°C)
A
50,000 Wiper Store Cycles
50 Years Wiper Data Retention
♦ 1.5µA (max) Standby Current
The MAX5494–MAX5499 are ideal for applications requir-
ing digitally controlled potentiometers. End-to-end resis-
tance values of 10kΩ and 50kΩ are available with a
35ppm/°C end-to-end temperature coefficient. The ratio-
metric temperature coefficient is 5ppm/°C for each chan-
nel, making these devices ideal for applications requiring
low-temperature-coefficient programmable voltage-
dividers such as low-drift, programmable-gain amplifiers.
♦ Single +2.7V to +5.25V Supply Operation
♦ Dual 2.5V Supply Operation
Pin Configurations
TOP VIEW
12
11
10
9
The MAX5494–MAX5499 operate with either a single
power supply (+2.7V to +5.25V) or dual power supplies
( 2.5V). The devices consume 400ꢀA (maꢁ) of supply
current when writing data to the nonvolatile memory
and 1.5ꢀA (maꢁ) of standby supply current. The
devices are available in space-saving (5mm ꢁ 5mm ꢁ
0.8mm), 16-pin TQFN package and are specified over
the eꢁtended (-40°C to +85°C) temperature range.
DIN 13
V
SS
8
7
6
5
N.C.
N.C.
14
15
N.C.
N.C.
MAX5494
MAX5495
SCLK 16
V
DD
1
2
3
4
Applications
Gain and Offset Adjustment
5mm × 5mm × 0.8mm TQFN
LCD Contrast Adjustment
Pressure Sensors
12
11
10
9
Low-Drift Programmable-Gain Amplifiers
Mechanical Potentiometer Replacement
Volume Control
DIN 13
V
SS
8
7
6
5
N.C.
N.C.
14
15
N.C.
N.C.
MAX5496
MAX5497
Ordering Information
PIN-
PACKAGE
PART
TEMP RANGE
PKG CODE
SCLK 16
V
DD
MAX5494ETE -40°C to +85°C 16 TQFN-EP*
MAX5495ETE -40°C to +85°C 16 TQFN-EP*
*EP = Exposed pad.
T1655-2
T1655-2
1
2
3
4
Ordering Information continued at end of data sheet.
Selector Guide appears at end of data sheet.
SPI is a trademark of Motorola, Inc.
5mm × 5mm × 0.8mm TQFN
Pin Configurations continued at end of data sheet.
________________________________________________________________ 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.
10-Bit, Dual, Nonvolatile, Linear-Taper
Digital Potentiometers
ABSOLUTE MAXIMUM RATINGS
V
V
V
to GND...........................................................-0.3V to +6.0V
to GND............................................................-6.0V to +0.3V
Continuous Power Dissipation (T = +70°C)
A
DD
SS
DD
16-Pin TQFN (derate 20.8mW/°C above +70°C) ....1666.7mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-60°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
to V .............................................................-0.3V to +6.0V
SS
H1, H2, L1, L2, W1, W2 to V .........(V - 0.3V) to (V
+ 0.3V)
+ 0.3V)
SS
SS
DD
DD
CS, SCLK, DIN to GND ..............................-0.3V to (V
Maꢁimum Continuous Current into H_, L_, and W_
MAX5494/MAX5496/MAX5498.................................... 5.0mA
MAX5495/MAX5497/MAX5499.................................... 1.0mA
Maꢁimum Current Into Other Pins ................................. 50.0mA
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
= +2.7V to +5.25V, V = GND = 0, V = V , V = 0, T = -40°C to +85°C, unless otherwise noted. Typical values are at
DD
SS
H_
DD L_
A
V
= +5.0V, T = +25°C.) (Note 1)
DD
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DC PERFORMANCE (MAX5494/MAX5495/MAX5498/MAX5499 Programmable Voltage-Divider)
Resolution
N
10
Bits
V
V
V
V
= 2.7V
= 5V
2
2
1
1
DD
DD
DD
DD
Integral Nonlinearity (Note 2)
INL
LSB
= 2.7V
= 5V
Differential Nonlinearity (Note 2)
DNL
LSB
ppm/°C
ppm/°C
LSB
End-to-End Resistance
Temperature Coefficient
TC
35
5
R
Ratiometric Temperature
Coefficient
MAX5494/MAX5498
MAX5495/MAX5499
MAX5494/MAX5498
MAX5495/MAX5499
-4
-4
0
-2.5
-0.75
3.3
0
0
5
5
Full-Scale Error
FSE
ZSE
Zero-Scale Error
LSB
pF
0
1.45
60
Wiper Capacitance
End-to-End Resistance
C
W
MAX5494/MAX5498
MAX5495/MAX5499
7.5
10
12.5
62.5
R
kΩ
HL
37.5
50
MAX5494
MAX5495
0.05
0.15
Channel-to-Channel Division
Ratio Matching
V
= 3V, midcode: 512
%
DD
MAX5494/MAX5498, W_ at 15 code, H_ and
L_ shorted to V , measure resistance from
SS
W_ to H_ (Figures 4 and 5)
6.3
25
Resistance from W_ to L_ and H_
kΩ
MAX5495/MAX5499, W_ at 15 code, H_ and
L_ shorted to V , measure resistance from
SS
W_ to H_ (Figures 4 and 5)
2
_______________________________________________________________________________________
10-Bit, Dual, Nonvolatile, Linear-Taper
Digital Potentiometers
ELECTRICAL CHARACTERISTICS (continued)
(V
= +2.7V to +5.25V, V = GND = 0, V = V , V = 0, T = -40°C to +85°C, unless otherwise noted. Typical values are at
DD
SS
H_
DD L_
A
V
= +5.0V, T = +25°C.) (Note 1)
DD
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Bits
DC PERFORMANCE (MAX5496–MAX5499 Variable Resistor)
Resolution
N
10
V
V
V
V
V
V
= 2.7V
= 3V
-1.6
-1.4
DD
DD
DD
DD
DD
DD
Integral Nonlinearity (Note 3)
INL_R
-4
-4
+4
+4
LSB
= 5V
-1.3
= 2.7V
= 3V
+0.45
+0.4
+0.35
Differential Nonlinearity (Note 3)
DNL_R
-1
-1
+1
+1
LSB
= 5V
Variable-Resistor Temperature
Coefficient
TC
V
V
= 3V to 5.25V; code = 128 to 1024
35
ppm/°C
VR
DD
DD
Wiper Resistance
Wiper Capacitance
R
≥ 3V (Note 4)
50
60
Ω
W
C
pF
WR
MAX5496/MAX5498
MAX5497/MAX5499
7.5
10
12.5
62.5
Full-Scale Wiper-to-End
Resistance
R
W-L
kΩ
37.5
50
MAX5494/MAX5498
MAX5495/MAX5499
70
Zero-Scale Resistor Error
R
Code = 0
Ω
Z
110
MAX5496/MAX5498,
Code >128
0.1
Two-Channel Resistance
Matching
V
= 3V to 5.25V
%
DD
MAX5497/MAX5499,
Code >200
0.15
DIGITAL INPUTS (CS, SCLK, DIN) (Note 5)
V
V
= 3.6V to 5.25V
= 2.7V to 3.6V
2.4
DD
DD
Single-supply
operation
0.7 ꢁ
V
Input High Voltage
Input Low Voltage
V
V
V
DD
IH
With respect to
GND, V = 2.5V,
V
Dual-supply
operation
2.0
DD
= -2.5V
SS
Single-supply
operation
V
= 2.7V to 5.25V
0.8
DD
V
IL
With respect to
GND, V = 2.5V,
V
Dual-supply
operation
0.6
1
DD
= -2.5V
SS
Input Leakage Current
Input Capacitance
I
ꢀA
pF
IN
C
5
IN
DYNAMIC CHARACTERISTICS
Wiper at code 495
(01111 01111), 10pF
load at wiper
MAX5494/MAX5498
MAX5495/MAX5499
250
50
Wiper -3dB Bandwidth
BW
kHz
_______________________________________________________________________________________
3
10-Bit, Dual, Nonvolatile, Linear-Taper
Digital Potentiometers
ELECTRICAL CHARACTERISTICS (continued)
(V
= +2.7V to +5.25V, V = GND = 0, V = V , V = 0, T = -40°C to +85°C, unless otherwise noted. Typical values are at
DD
SS
H_
DD L_
A
V
= +5.0V, T = +25°C.) (Note 1)
DD
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX5494/MAX5498; V
= 3V; wiper at
DD
code 495; 10kHz, 1V
signal is applied
0.026
RMS
at H_; 10pF load at wiper
Total Harmonic Distortion
Analog Crosstalk
THD
%
MAX5495/MAX5499; V
code 495; 10kHz, 1V
= 3V; wiper at
signal is applied
DD
0.03
-93
RMS
at H_; 10pF load at wiper
CH2 = 11111 11111, CH1 = 01111 01111,
C
= 10pF, V = V
= +2.5V,
DD
W_
L1
H1
dB
V
V
= V = -2.5V, measure V
with
SS
W1
= 5V
at f = 1kHz
W2
P-P
NONVOLATILE MEMORY RELIABILITY
Data Retention
T
A
T
A
T
A
= +85°C
= +25°C
= +85°C
50
Years
200,000
50,000
Endurance
Stores
POWER SUPPLIES
Single-Supply Voltage
V
V
V
= GND = 0
SS
2.70
2.50
-2.5
5.25
5.25
-0.2
V
V
DD
DD
GND = 0
Dual-Supply Voltage
V
(V - V ) ≤ 5.25V
SS
DD
SS
During nonvolatile write only;
digital inputs = V or GND
Average Programming Current
I
220
400
ꢀA
PG
DD
During nonvolatile write only;
digital inputs = V or GND
Peak Programming Current
Standby Current
4
mA
ꢀA
DD
I
Digital inputs = V
or GND, T = +25°C
0.6
1.5
DD
DD
A
4
_______________________________________________________________________________________
10-Bit, Dual, Nonvolatile, Linear-Taper
Digital Potentiometers
TIMING CHARACTERISTICS
(V
= +2.7V to +5.25V, V = GND = 0, V = V , V = 0, T = -40°C to +85°C, unless otherwise noted. Typical values are at
DD
SS
H_
DD L_
A
V
= +5.0V, T = +25°C.) (Note 1)
DD
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
ANALOG SECTION
MAX5494/MAX5498
MAX5495/MAX5499
5
Wiper Settling Time (Note 6)
t
S
ꢀs
22
SPI-COMPATIBLE SERIAL INTERFACE (Figure 6)
SCLK Frequency
f
7
MHz
ns
SCLK
SCLK Clock Period
t
140
60
60
60
0
CP
CH
SCLK Pulse-Width High
SCLK Pulse-Width Low
CS Fall to SCLK Rise Setup
SCLK Rise to CS Rise Hold
DIN to SCLK Setup
t
ns
ns
t
CL
t
ns
CSS
CSH
t
ns
ns
t
40
0
DS
DH
DIN Hold After SCLK
t
ns
ns
ns
SCLK Rise to CS Fall Delay
CS Rise to SCLK Rise Hold
CS Pulse-Width High
t
t
15
60
150
CS0
CS1
t
ns
CSW
Write NV Register Busy Time
t
12
ms
BUSY
Note 1: 100% production tested at T = +25°C and T = +85°C. Guaranteed by design to T = -40°C.
A
A
A
Note 2: The DNL and INL are measured for the voltage-divider with H_ = V
and L_ = V . The wiper terminal (W_) is unloaded
DD
SS
and measured with a high-input-impedance voltmeter.
Note 3: The DNL and INL are measured with L_ = V = 0. For V
= 5V, the wiper terminal is driven with a current source of I
=
SS
DD
W
80ꢀA for the 50kΩ device and I = 400ꢀA for the 10kΩ device. For V
= 3V, the wiper terminal is driven with a current
source of I = 40ꢀA for the 50kΩ device and I = 200ꢀA for the 10kΩ device.
W
DD
W
W
Note 4: The wiper resistance is measured using the source currents given in Note 3.
Note 5: The device draws higher supply current when the digital inputs are driven with voltages between (V
- 0.5V) and (GND +
DD
0.5V). See the Supply Current vs. Digital Input Voltage graph in the Typical Operating Characteristics.
Note 6: Wiper settling test condition uses the voltage-divider with a 10pF load on W_. Transition code from 0 to 495 and measure
the time from CS going high to the wiper voltage settling to within 0.5% of its final value.
_______________________________________________________________________________________
5
10-Bit, Dual, Nonvolatile, Linear-Taper
Digital Potentiometers
Typical Operating Characteristics
(V
= +5.0V, V = 0, T = +25°C, unless otherwise noted.)
SS A
DD
INTEGRAL NONLINEARITY
vs. CODE (VARIABLE RESISTOR)
MAXIMUM DIFFERENTIAL NONLINEARITY
vs. SUPPLY VOLTAGE (VARIABLE RESISTOR)
DIFFERENTIAL NONLINEARITY
vs. CODE (VARIABLE RESISTOR)
1.5
1.0
0.5
0
1.0
1.0
V
= 3V
V
= 3V
DD
DD
0.8
0.6
0.8
0.6
0.4
0.4
0.2
0.2
0
0
-0.2
-0.4
-0.6
-0.8
-1.0
-0.2
-0.4
-0.6
-0.8
-1.0
-0.5
-1.0
-1.5
0
128 256 384 512 640 768 896 1024
CODE
2.5
3.0
3.5
4.0
(V)
4.5
5.0
0
128 256 384 512 640 768 896 1024
CODE
V
DD
MAXIMUM INTEGRAL NONLINEARITY
vs. SUPPLY VOLTAGE (VARIABLE RESISTOR)
INTEGRAL NONLINEARITY
vs. CODE (VOLTAGE-DIVIDER)
DIFFERENTIAL NONLINEARITY
vs. CODE (VOLTAGE-DIVIDER)
1.0
1.5
1.0
0.5
0
1.0
0.8
V
= 3V
V
= 3V
DD
DD
0.5
0
0.6
0.4
0.2
-0.5
-1.0
-1.5
-2.0
0
-0.2
-0.4
-0.6
-0.8
-1.0
-0.5
-1.0
-1.5
2.5
3.0
3.5
4.0
(V)
4.5
5.0
0
128 256 384 512 640 768 896 1024
CODE
0
128 256 384 512 640 768 896 1024
CODE
V
DD
END-TO-END RESISTANCE
vs. CODE (MAX5497/MAX5499)
END-TO-END RESISTANCE vs. CODE
(MAX5496/MAX5498)
WIPER RESISTANCE vs. CODE
(VARIABLE RESISTOR)
60
12
10
8
80
70
60
50
40
30
20
10
0
50
40
30
20
10
0
6
4
2
0
0
128 256 384 512 640 768 896 1024
CODE
0
128 256 384 512 640 768 896 1024
CODE
0
128 256 384 512 640 768 896 1024
CODE
6
_______________________________________________________________________________________
10-Bit, Dual, Nonvolatile, Linear-Taper
Digital Potentiometers
Typical Operating Characteristics (continued)
(V
= +5.0V, V = 0, T = +25°C, unless otherwise noted.)
SS A
DD
END-TO-END RESISTANCE (R
% CHANGE vs. TEMPERATURE
(VOLTAGE-DIVIDER)
)
HL
WIPER-TO-END RESISTANCE (R
)
WL
% CHANGE vs. TEMPERATURE
(VARIABLE RESISTOR)
WIPER RESISTANCE vs. WIPER VOLTAGE
(VARIABLE RESISTOR)
1.0
0.8
1.0
0.8
22
CODE IS 11 1111 1111
V
= 5V
CODE IS 00 0000 0000
DD
21
20
0.6
0.6
0.4
0.4
0.2
0.2
0
0
19
18
17
16
-0.2
-0.4
-0.6
-0.8
-1.0
-0.2
-0.4
-0.6
-0.8
-1.0
-40
-15
10
35
60
85
-40
-15
10
35
60
85
0
1
2
3
4
5
TEMPERATURE (°C)
TEMPERATURE (°C)
WIPER VOLTAGE (V)
STANDBY SUPPLY CURRENT
vs. TEMPERATURE
RATIOMETRIC TEMPERATURE
COEFFICIENT vs. CODE
DIGITAL SUPPLY CURRENT
vs. DIGITAL INPUT VOLTAGE
1.5
200
180
160
140
120
100
80
10,000
1000
100
10
V
= 5.25V
VOLTAGE-DIVIDER
DD
V
= 5V
DD
V
T
= 3V
DD
A
= -40°C TO +85°C
1.2
0.9
0.6
0.3
0
60
40
1
10kΩ
50kΩ
20
0
0.1
-40
-15
10
35
60
85
0
128 256 384 512 640 768 896 1024
CODE
0
1
2
3
4
5
TEMPERATURE (°C)
DIGITAL INPUT VOLTAGE (V)
TAP-TO-TAP SWITCHING TRANSIENT
VARIABLE RESISTOR TEMPERATURE
COEFFICIENT vs. CODE
TAP-TO-TAP SWITCHING TRANSIENT
(MAX5494/MAX5498)
(MAX5495/MAX5499)
MAX5494 toc18
MAX5494 toc17
700
600
500
400
300
200
100
0
CS
2V/div
CS
2V/div
V
T
= 3V
DD
A
= -40°C TO +85°C
V
V
W_
W_
20mV/div
20mV/div
H_ = V
L_ = GND
FROM CODE 01111 11111
TO CODE 10000 00000
H_ = V
DD
L_ = GND
FROM CODE 01111 11111
TO CODE 10000 00000
DD
50kΩ
10kΩ
C
= 10pF
C
W_
= 10pF
W_
0
128 256 384 512 640 768 896 1024
CODE
4µs/div
1µs/div
_______________________________________________________________________________________
7
10-Bit, Dual, Nonvolatile, Linear-Taper
Digital Potentiometers
Typical Operating Characteristics (continued)
(V
= +5.0V, V = 0, T = +25°C, unless otherwise noted.)
SS A
DD
CROSSTALK
CROSSTALK vs. FREQUENCY
MAX5494 toc19
V
W2
0
C
= 10pF
2V/div
W_
CODE = 01111 01111
-20
-40
-60
V
W1
-80
20mV/div
MAX5494/MAX5498
MAX5495/MAX5499
V
V
C
= V
DD
H2
L2
-100
-120
= V = V = GND
L1
H1
= 10pF
W_
400ns/div
1000
0.01
0.1
1
10
100
FREQUENCY (kHz)
THD+N vs. FREQUENCY
(MAX5495/MAX5499)
THD+N vs. FREQUENCY
(MAX5494/MAX5498)
10
1
10
1
C
= 10pF
CODE = 01111 01111
W_
C
= 10pF
CODE = 01111 01111
W_
0.1
0.1
0.01
0.01
0.001
0.0001
0.001
0.0001
0.01
0.1
1
10
100
0.01
0.1
1
10
100
FREQUENCY (kHz)
FREQUENCY (kHz)
WIPER RESPONSE vs. FREQUENCY
(MAX5494/MAX5498)
WIPER RESPONSE vs. FREQUENCY
(MAX5495/MAX5499)
0
-5
0
-5
C
= 10pF
W_
C
= 10pF
W_
-10
-15
-20
-25
-10
-15
-20
-25
C
= 30pF
W_
C
= 30pF
W_
CODE = 01111 01111
0.1
CODE = 01111 01111
0.1
1
10
FREQUENCY (kHz)
100
1000
1
10
FREQUENCY (kHz)
100
1000
8
_______________________________________________________________________________________
10-Bit, Dual, Nonvolatile, Linear-Taper
Digital Potentiometers
Pin Descriptions
PIN
NAME
FUNCTION
MAX5494/ MAX5496/ MAX5498/
MAX5495 MAX5497 MAX5499
Active-Low Chip-Select Input. Drive CS low to enable the serial interface. Drive
CS high to disable the serial interface and put the device in standby mode.
1
1
1
CS
2
3
4
2
3
2
3
W2
L2
Wiper Terminal 2
Low Terminal 2
High Terminal 2
—
—
H2
Positive Power-Supply Input. 2.7V ≤ V ≤ 5.25V. Bypass with a 0.1ꢀF
DD
5
5
5
V
DD
capacitor from V
to GND as close to the device as possible
DD
6, 7,14,15 6, 7,14,15 6, 7,14,15
N.C.
No Connection. Not internally connected.
Negative Power-Supply Input.
Single-supply operation: V = GND = 0.
SS
Dual-supply operation: -2.5V ≤ V ≤ -0.2V (V can vary as long as
SS
SS
8
8
8
V
SS
(V
DD
- V ) ≤ 5.25V).
SS
Bypass with a 0.1ꢀF capacitor from V to GND as close to the device
SS
as possible.
9
—
10
11
12
9
H1
L1
High Terminal 1
Low Terminal 1
Wiper Terminal 1
Ground
10
11
12
10
11
12
W1
GND
Serial-Data Input. The data at DIN synchronously loads into the serial shift
register on each SCLK rising edge.
13
13
13
DIN
16
—
16
16
4
SCLK
D.N.C
Serial-Clock Input . SCLK clocks in the data when CS is low.
4, 9
Do Not Connect. Leave unconnected for proper operation.
Eꢁposed Eꢁposed Pad. Eꢁternally connect EP to V to provide a low thermal resistance
SS
EP
EP
EP
Pad
path from the IC junction to the PC board or leave unconnected.
_______________________________________________________________________________________
9
10-Bit, Dual, Nonvolatile, Linear-Taper
Digital Potentiometers
Functional Diagrams
H1
1024
TAPS
10
10-BIT
LATCH
V
DD
W1
DECODER
GND
2 x 10
BIT
NVM
V
SS
POR
CS
SCLK
DIN
SPI
INTERFACE
10
10-BIT
LATCH
L1
H2
1024
TAPS
MAX5494
MAX5495
W2
DECODER
L2
NOTE: THE PROGRAMMABLE VOLTAGE-DIVIDER IS NOT INTENDED FOR CURRENT TO FLOW THROUGH THE WIPER.
NOTE: SEE THE MAX5494/MAX5495/MAX5498/MAX5499 PROGRAMMABLE VOLTAGE-DIVIDERS SECTION.
Figure 1. MAX5494/MAX5495 Functional Diagram
10 ______________________________________________________________________________________
10-Bit, Dual, Nonvolatile, Linear-Taper
Digital Potentiometers
Functional Diagrams (continued)
1024
TAPS
10
10-BIT
LATCH
V
DD
W1
L1
DECODER
GND
2 x 10
BIT
NVM
V
SS
POR
CS
SCLK
DIN
SPI
INTERFACE
1024
TAPS
10
10-BIT
LATCH
W2
L2
DECODER
MAX5496
MAX5497
Figure 2. MAX5496/MAX5497 Functional Diagram
H1
1024
TAPS
10
10-BIT
LATCH
V
DD
W1
DECODER
GND
2 x 10
BIT
NVM
V
SS
POR
CS
SCLK
DIN
SPI
INTERFACE
10
10-BIT
LATCH
L1
1024
TAPS
MAX5498
MAX5499
W2
L2
DECODER
NOTE: THE PROGRAMMABLE VOLTAGE-DIVIDER IS NOT INTENDED FOR CURRENT TO FLOW THROUGH THE WIPER.
NOTE: SEE THE MAX5494/MAX5495/MAX5498/MAX5499 PROGRAMMABLE VOLTAGE-DIVIDERS SECTION.
Figure 3. MAX5498/MAX5499 Functional Diagram
______________________________________________________________________________________ 11
10-Bit, Dual, Nonvolatile, Linear-Taper
Digital Potentiometers
Detailed Description
V
− |V
| + |V
|
)
(
HL
FSE
ZSE
D
+ V + |V
|
L
ZSE
The MAX5494–MAX5499 dual, nonvolatile, linear-taper,
programmable voltage-dividers and variable resistors
feature 1024 tap points (10-bit resolution) (see the
Functional Diagrams). These devices consist of multi-
ple strings of equal resistor segments with a wiper con-
tact that moves among the 1024 effective tap points by
a 3-wire SPI-compatible serial interface. The
MAX5494/MAX5496/MAX5498 provide a total 10kΩ
end-to-end resistance, and the MAX5495/MAX5497/
MAX5499 feature a 50kΩ end-to-end resistance. The
MAX5494/MAX5495/MAX5498/MAX5499 allow access
to the high, low, and wiper terminals for a standard volt-
age-divider configuration. Ensure that the terminal volt-
1023
where D is the decimal equivalent of the 10 data bits
written (0 to 1023), V is the voltage difference between
HL
the H_ and L_ terminals, and:
V
HL
1024
V
= FSE
FSE
V
HL
1024
V
= ZSE
ZSE
The MAX5494/MAX5498 provide a 10kΩ end-to-end
resistance value, while the MAX5495/MAX5499 feature a
50kΩ end-to-end resistance value. Note that the pro-
grammable voltage-divider is not intended to be used
as a variable resistor. Wiper current creates a nonlinear
voltage drop in series with the wiper. To ensure tempera-
ture drift remains within specifications, do not pull current
through the voltage-divider wiper. Connect the wiper to a
high-impedance node. Figures 4 and 5 show the behav-
ior of the programmable voltage-divider resistance from
W_ to H_ and W_ to L_, respectively. This does not apply
to the variable-resistor devices.
ages fall between V and V
.
DD
SS
MAX5494/MAX5495/MAX5498/MAX5499
Programmable Voltage-Dividers
The MAX5494/MAX5495/MAX5498/MAX5499 program-
mable voltage-dividers provide a weighted average of
the voltage between the H_ and L_ inputs at the W_
output.
The MAX5494/MAX5495/MAX5498/MAX5499 program-
mable voltage-divider network provides up to 1024
division ratios between the H_ and L_ voltage. Ideally,
the V voltage occurs at the wiper terminal when all
L
data bits are zeros and the V voltage occurs at the
H
MAX5496–MAX5499 Variable Resistors
The MAX5496–MAX5499 provide a programmable resis-
tance from W_ to L_. The MAX5496/MAX5498 provide a
10kΩ end-to-end resistance value, while the
MAX5497/MAX5499 feature a 50kΩ end-to-end resis-
tance value. The programmable resolution of this
wiper terminal when all data bits are one (see the wiper
voltage equation). The step-size voltage (1 LSB) is
equal to the voltage applied across terminals H and L
divided by 210. Calculate the wiper voltage V as fol-
W
lows:
18
16
14
12
10
8
18
16
14
12
10
8
6
6
4
4
2
2
0
0
0
128 256 384 512 640 768 896 1024
CODE (DECIMAL)
0
128 256 384 512 640 768 896 1024
CODE (DECIMAL)
50kΩ SCALES BY A FACTOR OF FIVE
50kΩ SCALES BY A FACTOR OF FIVE
Figure 5. Resistance from W_ to L_ vs. Code (10kΩ Voltage-
Divider)
Figure 4. Resistance from W_ to H_ vs. Code (10kΩ Voltage-
Divider)
12 ______________________________________________________________________________________
10-Bit, Dual, Nonvolatile, Linear-Taper
Digital Potentiometers
resistance is equal to the nominal end-to-end resis-
either eight clock cycles to transfer the command bits
(Figure 7b) or 24 clock cycles with 16 bits disregarded
by the device (Figure 7a).
tance divided by 1024 (10-bit resolution). For eꢁample,
the programmable resolution is 9.8Ω and 48.8Ω for the
MAX5496/MAX5498 and the MAX5497/MAX5499,
respectively.
After the loading of data into the shift register, drive CS
high to latch the data into the appropriate control regis-
ter (specified by RA1 and RA0) and disable the serial
interface. Keep CS low during the entire serial data
stream to avoid corruption of the data. Table 2 shows
the register map.
The 10-bit data in the 10-bit latch register selects the
wiper position from the 1024 possible positions, result-
ing in 1024 values for the resistance from W_ to L_.
Calculate the resistance from W_ to L_ (R ) from the
WL
formula below:
Write Wiper Register
The “write wiper register” command (C1, C0 = 00) con-
trols the wiper positions. The 10 data bits (D9–D0) indi-
cate the position of the wiper. For eꢁample, if DIN =
000000 0000, the wiper moves to the position closest to
L_. If DIN = 11 1111 1111, the wiper moves closest to H_.
D
1023
R
D =
( )
×R
+R
W−L Z
WL
where D is decimal equivalent of the 10 data bits writ-
ten, R is the nominal end-to-end resistance, and R
W-L
Z
is the zero-scale error. Table 1 shows R
codes.
at selected
WL
Table 1. RWL at Selected Codes
SPI-Compatible Serial Interface
The MAX5494–MAX5499 use a 3-wire, SPI-compatible,
serial data interface (Figure 6). This write-only interface
contains three inputs: chip-select (CS), data input
(DIN), and data clock (SCLK). Drive CS low to enable
the serial interface and clock data synchronously into
the shift register on each SCLK rising edge.
END-TO-END RESISTANCE VALUE
CODE (DECIMAL)
10kΩ
(Ω)
50kΩ
R (Ω)
WL
R
WL
0
1
70
110
160
80
512
1023
5,070
10,070
25,110
50,110
The WRITE commands (C1, C0 = 00 or 01) require 24
clock cycles to transfer the command and data (Figure
7a). The COPY commands (C1, C0 = 10 or 11) use
CS
t
CSW
t
CSS
t
CS1
t
t
CP
t
t
t
CL
CH
CSH
CSO
SCLK
DIN
t
t
DH
DS
Figure 6. SPI-Interface Timing Diagram
______________________________________________________________________________________ 13
10-Bit, Dual, Nonvolatile, Linear-Taper
Digital Potentiometers
a) 24-BIT COMMAND/DATA WORD
CS
SCLK
11 12
RA1 RA0 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
23 24
1
2
3
4
5
6
7
8
9
13 14 15 16
18 19 20 21 22
10
17
C1 C0
DIN
b) 8-BIT COMMAND WORD
CS
SCLK
1
2
3
4
5
6
7
8
DIN
C1 C0
RA1 RA0
Figure 7. SPI-Compatible Serial-Interface Format
Table 2. Register Map*
CLOCK EDGE
Bit Name
1
—
0
2
—
0
3
4
5
—
0
6
—
0
7
8
9
10 11 12 13 14 15 16 17 18
…
—
—
—
—
—
24
—
—
—
—
—
C1 C0
RA1 RA0 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Write Wiper Register 1
Write Wiper Register 2
Write NV Register 1
Write NV Register 2
0
0
0
0
0
0
1
1
0
1
0
1
1
0
1
0
D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
0
0
0
0
0
0
0
0
0
0
0
0
Copy Wiper Register 1
to NV Register 1
0
0
0
0
1
1
0
0
0
0
0
0
0
1
1
0
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Copy Wiper Register 2
to NV Register 2
Copy Wiper Register 1
to NV Register 1 and
Copy Wiper Register 2
to NV Register 2
0
0
1
0
0
0
1
1
—
—
—
—
—
—
—
—
—
—
—
—
Simultaneously
Copy NV Register 1 to
Wiper Register 1
0
0
0
0
1
1
1
1
0
0
0
0
0
1
1
0
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Copy NV Register 2 to
Wiper Register 2
Copy NV Register 1 to
Wiper Register 1 and
Copy NV Register 2 to
Wiper Register 2
0
0
1
1
0
0
1
1
—
—
—
—
—
—
—
—
—
—
—
—
Simultaneously
*D9 is the MSB and D0 is the LSB of the data bits.
14 ______________________________________________________________________________________
10-Bit, Dual, Nonvolatile, Linear-Taper
Digital Potentiometers
The “write wiper register” command writes data to the
the NV register does not affect the position of the
wipers. The operation takes up to 12ms (maꢁ) after CS
goes high to complete and no other operation should
be performed until completion. Figure 9 shows how to
write data to the NV register 1.
volatile random access memory (RAM), leaving the NV
registers unchanged. When the device powers up, the
data stored in the NV registers transfers to the wiper
register, moving the wiper to the stored position. Figure
8 shows how to write data to wiper register 1.
Copy Wiper Register to NV Register
The “copy wiper register to NV register” command (C1,
C0 = 10) stores the current position of the wiper to the
NV register for use at power-up. Figure 10 shows how
to copy data from wiper register 1 to NV register 1.
Write NV Register
The “write NV register” command (C1, C0 = 01) stores
the position of the wiper to the NV registers for use at
power-up. Alternatively, the “copy wiper register to NV
register” command writes to the NV register. Writing to
CS
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16
17 18 19 20 21 22 23 24
SCLK
DIN
C1 C0
RA1 RA0
0
0
0
0
0
0
0
1
D9 D8 D7 D6 D5 D4 D3 D2
D1 D0
X
X
X
X
X
X
WIPER
REGISTER 1
UPDATED
ACTION
Figure 8. Write Wiper Register 1
CS
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16
17 18 19 20 21 22 23 24
SCLK
DIN
C1 C0
RA1 RA0
0
0
0
1
0
0
0
1
D9 D8 D7 D6 D5 D4 D3 D2
D1 D0
X
X
X
X
X
X
t
BUSY
WRITE NV
REGISTER 1
(DEVICE IS BUSY)
ACTION
Figure 9. Write NV Register 1
______________________________________________________________________________________ 15
10-Bit, Dual, Nonvolatile, Linear-Taper
Digital Potentiometers
Copy NV Register to Wiper Register
The “copy NV register to wiper register” (C1, C0 = 11)
restores the wiper position to the current value stored in
the NV register. Figure 11 shows how to copy data from
NV register 1 to wiper register 1.
the factory. The nonvolatile memory is guaranteed for
50 years for wiper data retention and up to 200,000
wiper write cycles.
Power-Up
Upon power-up, the MAX5494–MAX5499 load the data
stored in the nonvolatile wiper register into the wiper
register, updating the wiper position with the data
stored in the nonvolatile wiper register.
Standby Mode
The MAX5494–MAX5499 feature a low-power standby
mode. When the device is not being programmed, it
enters into standby mode and supply current drops to
0.6ꢀA (typ).
Applications Information
The MAX5494–MAX5499 are intended for circuits
requiring digitally controlled adjustable resistance,
such as LCD contrast control (where voltage biasing
adjusts the display contrast), or programmable filters
with adjustable gain and/or cutoff frequency.
Nonvolatile Memory
The internal EEPROM consists of a nonvolatile register
that retains the last value stored prior to power-down.
The nonvolatile register is programmed to midscale at
CS
CS
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
SCLK
DIN
SCLK
DIN
C1
C0
RA1 RA0
C1
C0
RA1 RA0
0
0
1
0
0
0
0
1
0
0
1
1
0
0
0
1
t
BUSY
WRITE NV
REGISTER 1
(DEVICE IS BUSY)
WIPER REGISTER
1 UPDATED
ACTION
ACTION
Figure 10. Copy Wiper Register 1 to NV Register 1
Figure 11. Copy NV Register 1 to Wiper Register 1
16 ______________________________________________________________________________________
10-Bit, Dual, Nonvolatile, Linear-Taper
Digital Potentiometers
Positive LCD Bias Control
R1
R2
1
G =1+
Figures 12 and 13 show an application where the volt-
age-divider or variable resistor is used to make an
adjustable, positive LCD-bias voltage. The op amp pro-
vides buffering and gain to the resistor-divider network.
f
=
C
2π × R3 × C
Programmable Filter
Figure 14 shows the configuration for a 1st-order pro-
grammable filter. The gain of the filter is adjusted by
R2, and the cutoff frequency is adjusted by R3. Use the
following equations to calculate the gain (G) and the
Gain and Offset Voltage Adjustment
Figure 15 shows an application using the MAX5498/
MAX5499 to adjust the gain and nullify the offset voltage.
3dB cutoff frequency (f ).
C
5V
5V
H_
30V
30V
1/2 MAX5494/MAX5495
1/2 MAX5498/MAX5499
W_
V
OUT
V
OUT
MAX480
MAX480
L_
1/2 MAX5496–MAX5499
W_
L_
Figure 13. Positive LCD Bias Control Using a Variable Resistor
Figure 12. Positive LCD Bias Control Using a Voltage-Divider
C
V
REF
V
IN
H_
V
OUT
1/2 MAX5498/MAX5499
R3
1/2 MAX5496–MAX5499
W_
V
OUT
W_
R1
L_
L_
L_
1/2 MAX5498/MAX5499
1/2 MAX5496–MAX5499
R2
W_
W_
L_
V
IN
Figure 14. Programmable Filter
Figure 15. Gain- and Offset-Voltage Adjustment Circuit
______________________________________________________________________________________ 17
10-Bit, Dual, Nonvolatile, Linear-Taper
Digital Potentiometers
Selector Guide
Ordering Information (continued)
PIN-
PACKAGE
END-TO-END
RESISTANCE
PART
TEMP RANGE
PKG CODE
PART
CONFIGURATION
(kΩ)
MAX5496ETE -40°C to +85°C 16 TQFN-EP*
MAX5497ETE -40°C to +85°C 16 TQFN-EP*
MAX5498ETE -40°C to +85°C 16 TQFN-EP*
MAX5499ETE -40°C to +85°C 16 TQFN-EP*
T1655-2
T1655-2
T1655-2
T1655-2
Two programmable voltage-
dividers
MAX5494ETE
MAX5495ETE
10
50
Two programmable voltage-
dividers
*EP = Exposed pad.
MAX5496ETE Two variable resistors
MAX5497ETE Two variable resistors
10
50
One programmable voltage-
MAX5498ETE
10
50
divider and one variable resistor
Chip Information
TRANSISTOR COUNT: 32,262
One programmable voltage-
MAX5499ETE
divider and one variable resistor
PROCESS: BiCMOS
Pin Configurations (continued)
TOP VIEW
12
11
10
9
DIN 13
V
SS
8
7
6
5
N.C.
N.C.
14
15
N.C.
N.C.
MAX5498
MAX5499
SCLK 16
V
DD
1
2
3
4
5mm × 5mm × 0.8mm TQFN
18 ______________________________________________________________________________________
10-Bit, Dual, Nonvolatile, Linear-Taper
Digital Potentiometers
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information
go to www.maxim-ic.com/packages.)
D2
D
b
0.10 M
C A B
C
L
D2/2
D/2
k
L
MARKING
XXXXX
E/2
E2/2
C
(NE-1) X
e
L
E2
E
PIN # 1 I.D.
0.35x45°
DETAIL A
e/2
PIN # 1
I.D.
e
(ND-1) X
e
DETAIL B
e
L
C
C
L
L1
L
L
L
e
e
0.10
C
A
0.08
C
C
A3
A1
PACKAGE OUTLINE,
16, 20, 28, 32, 40L THIN QFN, 5x5x0.8mm
1
21-0140
H
-DRAWING NOT TO SCALE-
2
______________________________________________________________________________________ 19
10-Bit, Dual, Nonvolatile, Linear-Taper
Digital Potentiometers
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information
go to www.maxim-ic.com/packages.)
COMMON DIMENSIONS
20L 5x5 28L 5x5
EXPOSED PAD VARIATIONS
D2 E2
MIN. NOM. MAX. MIN. NOM. MAX. ±0.15
PKG.
SYMBOL MIN. NOM. MAX. MIN. NOM. MAX. MIN. NOM. MAX. MIN. NOM. MAX. MIN. NOM. MAX.
16L 5x5
32L 5x5
40L 5x5
DOWN
BONDS
ALLOWED
L
PKG.
CODES
A
0.70 0.75 0.80 0.70 0.75 0.80 0.70 0.75 0.80 0.70 0.75 0.80 0.70 0.75 0.80
T1655-1
T1655-2
3.00 3.10 3.20 3.00 3.10 3.20
3.00 3.10 3.20 3.00 3.10 3.20
NO
YES
NO
**
**
**
**
A1
A3
b
0
0.02 0.05
0.20 REF.
0
0.02 0.05
0.20 REF.
0
0.02 0.05
0.20 REF.
0
0.02 0.05
0.20 REF.
0
0.02 0.05
0.20 REF.
T1655N-1 3.00 3.10 3.20 3.00 3.10 3.20
0.25 0.30 0.35 0.25 0.30 0.35 0.20 0.25 0.30 0.20 0.25 0.30 0.15 0.20 0.25
4.90 5.00 5.10 4.90 5.00 5.10 4.90 5.00 5.10 4.90 5.00 5.10 4.90 5.00 5.10
4.90 5.00 5.10 4.90 5.00 5.10 4.90 5.00 5.10 4.90 5.00 5.10 4.90 5.00 5.10
T2055-2
T2055-3
T2055-4
T2055-5
3.00 3.10 3.20 3.00 3.10 3.20
3.00 3.10 3.20 3.00 3.10 3.20
3.00 3.10 3.20 3.00 3.10 3.20
NO
YES
NO
D
E
**
**
e
0.80 BSC.
0.25
0.65 BSC.
0.25
0.50 BSC.
0.25
0.50 BSC.
0.25
0.40 BSC.
YES
3.15 3.25 3.35 3.15 3.25 3.35 0.40
k
-
-
-
-
-
-
-
-
0.25 0.35 0.45
T2855-1
T2855-2
3.15 3.25 3.35 3.15 3.25 3.35
2.60 2.70 2.80 2.60 2.70 2.80
NO
NO
L
**
**
**
**
0.30 0.40 0.50 0.45 0.55 0.65 0.45 0.55 0.65 0.30 0.40 0.50 0.40 0.50 0.60
L1
-
-
-
-
-
-
-
-
-
-
-
-
0.30 0.40 0.50
40
T2855-3
T2855-4
3.15 3.25 3.35 3.15 3.25 3.35
2.60 2.70 2.80 2.60 2.70 2.80
2.60 2.70 2.80 2.60 2.70 2.80
3.15 3.25 3.35 3.15 3.25 3.35
YES
YES
NO
N
ND
NE
16
20
28
32
4
4
5
5
7
7
8
8
10
10
T2855-5
T2855-6
T2855-7
T2855-8
**
**
**
WHHB
WHHC
WHHD-1
WHHD-2
-----
JEDEC
NO
YES
2.80
3.35
3.35
3.20
2.60 2.70
3.15 3.25
2.60 2.70 2.80
3.15 3.25 3.35
3.15 3.25 3.35
3.00 3.10 3.20
0.40
YES
NO
NO
NOTES:
T2855N-1 3.15 3.25
**
**
**
1. DIMENSIONING & TOLERANCING CONFORM TO ASME Y14.5M-1994.
2. ALL DIMENSIONS ARE IN MILLIMETERS. ANGLES ARE IN DEGREES.
3. N IS THE TOTAL NUMBER OF TERMINALS.
T3255-2
T3255-3
T3255-4
3.00 3.10
3.00 3.10 3.20 3.00 3.10 3.20
3.00 3.10 3.20 3.00 3.10 3.20
YES
NO
**
**
**
4. THE TERMINAL #1 IDENTIFIER AND TERMINAL NUMBERING CONVENTION SHALL
CONFORM TO JESD 95-1 SPP-012. DETAILS OF TERMINAL #1 IDENTIFIER ARE
OPTIONAL, BUT MUST BE LOCATED WITHIN THE ZONE INDICATED. THE TERMINAL #1
IDENTIFIER MAY BE EITHER A MOLD OR MARKED FEATURE.
NO
T3255N-1 3.00 3.10 3.20 3.00 3.10 3.20
T4055-1 3.20 3.30 3.40 3.20 3.30 3.40
YES
**SEE COMMON DIMENSIONS TABLE
5. DIMENSION b APPLIES TO METALLIZED TERMINAL AND IS MEASURED BETWEEN
0.25 mm AND 0.30 mm FROM TERMINAL TIP.
6. ND AND NE REFER TO THE NUMBER OF TERMINALS ON EACH D AND E SIDE RESPECTIVELY.
7. DEPOPULATION IS POSSIBLE IN A SYMMETRICAL FASHION.
8. COPLANARITY APPLIES TO THE EXPOSED HEAT SINK SLUG AS WELL AS THE TERMINALS.
9. DRAWING CONFORMS TO JEDEC MO220, EXCEPT EXPOSED PAD DIMENSION FOR T2855-1,
T2855-3, AND T2855-6.
10. WARPAGE SHALL NOT EXCEED 0.10 mm.
11. MARKING IS FOR PACKAGE ORIENTATION REFERENCE ONLY.
12. NUMBER OF LEADS SHOWN ARE FOR REFERENCE ONLY.
13. LEAD CENTERLINES TO BE AT TRUE POSITION AS DEFINED BY BASIC DIMENSION "e", ±0.05.
PACKAGE OUTLINE,
16, 20, 28, 32, 40L THIN QFN, 5x5x0.8mm
2
-DRAWING NOT TO SCALE-
21-0140
H
2
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.
20 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2005 Maꢁim Integrated Products
Printed USA
is a registered trademark of Maꢁim Integrated Products, Inc.
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