19-3562; Rev 2; 1/06
KIT
ATION
EVALU
BLE
AVAILA
10-Bit, Dual, Nonvolatile, Linear-Taper
Digital Potentiometers
General Description
Features
♦
Wiper Position Stored in Nonvolatile Memory and
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
♦
Reliability (T
A
= +85°C)
50,000 Wiper Store Cycles
50 Years Wiper Data Retention
♦
1.5µA (max) Standby Current
♦
Single +2.7V to +5.25V Supply Operation
♦
Dual ±2.5V Supply Operation
MAX5494–MAX5499
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.
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.
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.
The MAX5494–MAX5499 operate with either a single
power supply (+2.7V to +5.25V) or dual power supplies
(±2.5V). The devices consume 400µA (max) of supply
current when writing data to the nonvolatile memory
and 1.5µA (max) of standby supply current. The
devices are available in space-saving (5mm x 5mm x
0.8mm), 16-pin TQFN package and are specified over
the extended (-40°C to +85°C) temperature range.
Pin Configurations
GND
W1
TOP VIEW
12
DIN 13
N.C. 14
N.C. 15
SCLK 16
1
CS
INTERFACE
11
10
H1
9
8
7
V
SS
N.C.
N.C.
V
DD
MAX5494
MAX5495
L1
6
5
W2
L2
10
L1
N.C. 14
N.C. 15
INTERFACE
Gain and Offset Adjustment
LCD Contrast Adjustment
Pressure Sensors
Low-Drift Programmable-Gain Amplifiers
Mechanical Potentiometer Replacement
Volume Control
5mm
×
5mm
×
0.8mm TQFN
D.N.C.
9
8
7
V
SS
N.C.
N.C.
V
DD
GND
W1
12
DIN 13
11
Ordering Information
PART
MAX5494ETE
MAX5495ETE
TEMP RANGE
PIN-
PACKAGE
PKG CODE
T1655-2
T1655-2
SCLK 16
MAX5496
MAX5497
H2
Applications
2
3
4
6
5
-40°C to +85°C 16 TQFN-EP*
-40°C to +85°C 16 TQFN-EP*
1
CS
2
W2
3
L2
4
D.N.C.
*EP
= Exposed pad.
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.
1
________________________________________________________________
Maxim Integrated Products
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.
10-Bit, Dual, Nonvolatile, Linear-Taper
Digital Potentiometers
MAX5494–MAX5499
ABSOLUTE MAXIMUM RATINGS
V
DD
to GND ...........................................................-0.3V to +6.0V
V
SS
to GND............................................................-3.5V to +0.3V
V
DD
to V
SS
.............................................................-0.3V to +6.0V
H1, H2, L1, L2, W1, W2 to V
SS
.........(V
SS
- 0.3V) to (V
DD
+ 0.3V)
CS,
SCLK, DIN to GND ..............................-0.3V to (V
DD
+ 0.3V)
Maximum Continuous Current into H_, L_, and W_
MAX5494/MAX5496/MAX5498 ....................................±5.0mA
MAX5495/MAX5497/MAX5499 ....................................±1.0mA
Maximum Current Into Other Pins .................................±50.0mA
Continuous Power Dissipation (T
A
= +70°C)
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
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
= +2.7V to +5.25V, V
SS
= GND = 0, V
H_
= V
DD
, V
L_
= 0, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at
V
DD
= +5.0V, T
A
= +25°C.) (Note 1)
PARAMETER
Resolution
Integral Nonlinearity (Note 2)
Differential Nonlinearity (Note 2)
End-to-End Resistance
Temperature Coefficient
Ratiometric Temperature
Coefficient
Full-Scale Error
Zero-Scale Error
Wiper Capacitance
End-to-End Resistance
Channel-to-Channel Division
Ratio Matching
FSE
ZSE
C
W
R
HL
MAX5494/MAX5498
MAX5495/MAX5499
V
DD
= 3V, midcode: 512
MAX5494
MAX5495
7.5
37.5
MAX5494/MAX5498
MAX5495/MAX5499
MAX5494/MAX5498
MAX5495/MAX5499
-4
-4
0
0
SYMBOL
N
INL
DNL
TC
R
V
DD
= 2.7V
V
DD
= 5V
V
DD
= 2.7V
V
DD
= 5V
35
5
-2.5
-0.75
3.3
1.45
60
10
50
0.05
0.15
6.3
kΩ
MAX5495/MAX5499, W_ at 15 code, H_ and
L_ shorted to V
SS
, measure resistance from
W_ to H_ (Figures 4 and 5)
25
12.5
62.5
0
0
5
5
CONDITIONS
MIN
10
±2
±2
±1
±1
TYP
MAX
UNITS
Bits
LSB
LSB
ppm/°C
ppm/°C
LSB
LSB
pF
kΩ
%
DC PERFORMANCE (MAX5494/MAX5495/MAX5498/MAX5499 Programmable Voltage-Divider)
MAX5494/MAX5498, W_ at 15 code, H_ and
L_ shorted to V
SS
, measure resistance from
W_ to H_ (Figures 4 and 5)
Resistance from W_ to L_ and H_
2
_______________________________________________________________________________________
10-Bit, Dual, Nonvolatile, Linear-Taper
Digital Potentiometers
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +2.7V to +5.25V, V
SS
= GND = 0, V
H_
= V
DD
, V
L_
= 0, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at
V
DD
= +5.0V, T
A
= +25°C.) (Note 1)
PARAMETER
Resolution
Integral Nonlinearity (Note 3)
SYMBOL
N
V
DD
= 2.7V
INL_R
V
DD
= 3V
V
DD
= 5V
V
DD
= 2.7V
Differential Nonlinearity (Note 3)
Variable-Resistor Temperature
Coefficient
Wiper Resistance
Wiper Capacitance
Full-Scale Wiper-to-End
Resistance
Zero-Scale Resistor Error
DNL_R
V
DD
= 3V
V
DD
= 5V
TC
VR
R
W
C
WR
R
W-L
R
Z
MAX5496/MAX5498
MAX5497/MAX5499
Code = 0
MAX5494/MAX5498
MAX5495/MAX5499
MAX5496/MAX5498,
Code >128
V
DD
= 3V to 5.25V
MAX5497/MAX5499,
Code >200
7.5
37.5
V
DD
= 3V to 5.25V; code = 128 to 1024
V
DD
≥
3V (Note 4)
-1
-1
-4
-4
CONDITIONS
MIN
10
-1.6
-1.4
-1.3
+0.45
+0.4
+0.35
35
50
60
10
50
70
110
0.1
%
0.15
12.5
62.5
+1
+1
ppm/°C
Ω
pF
kΩ
Ω
LSB
+4
+4
LSB
TYP
MAX
UNITS
Bits
DC PERFORMANCE (MAX5496–MAX5499 Variable Resistor)
MAX5494–MAX5499
Two-Channel Resistance
Matching
DIGITAL INPUTS (CS, SCLK, DIN) (Note 5)
Single-supply
operation
Input High Voltage
V
IH
Dual-supply
operation
Single-supply
operation
Input Low Voltage
V
IL
Dual-supply
operation
V
DD
= 3.6V to 5.25V
V
DD
= 2.7V to 3.6V
With respect to
GND, V
DD
= 2.5V,
V
SS
= -2.5V
V
DD
= 2.7V to 5.25V
With respect to
GND, V
DD
= 2.5V,
V
SS
= -2.5V
2.4
0.7 x
V
DD
2.0
V
0.8
V
0.6
±1
5
µA
pF
Input Leakage Current
Input Capacitance
DYNAMIC CHARACTERISTICS
Wiper -3dB Bandwidth
I
IN
C
IN
Wiper at code 495
(01111 01111), 10pF
load at wiper
MAX5494/MAX5498
MAX5495/MAX5499
250
kHz
50
BW
_______________________________________________________________________________________
3
10-Bit, Dual, Nonvolatile, Linear-Taper
Digital Potentiometers
MAX5494–MAX5499
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +2.7V to +5.25V, V
SS
= GND = 0, V
H_
= V
DD
, V
L_
= 0, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at
V
DD
= +5.0V, T
A
= +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MAX5494/MAX5498; V
DD
= 3V; wiper at
code 495; 10kHz, 1V
RMS
signal is applied
at H_; 10pF load at wiper
Total Harmonic Distortion
THD
MAX5495/MAX5499; V
DD
= 3V; wiper at
code 495; 10kHz, 1V
RMS
signal is applied
at H_; 10pF load at wiper
CH2 = 11111 11111, CH1 = 01111 01111,
C
W_
= 10pF, V
H1
= V
DD
= +2.5V,
V
L1
= V
SS
= -2.5V, measure V
W1
with
V
W2
= 5V
P-P
at f = 1kHz
0.03
MIN
TYP
0.026
%
MAX
UNITS
Analog Crosstalk
-93
dB
NONVOLATILE MEMORY RELIABILITY
Data Retention
Endurance
POWER SUPPLIES
Single-Supply Voltage
Dual-Supply Voltage
Average Programming Current
Peak Programming Current
Standby Current
I
DD
V
DD
V
DD
V
SS
I
PG
V
SS
= GND = 0
GND = 0
(V
DD
- V
SS
)
≤
5.25V
During nonvolatile write only;
digital inputs = V
DD
or GND
During nonvolatile write only;
digital inputs = V
DD
or GND
Digital inputs = V
DD
or GND, T
A
= +25°C
2.70
2.50
-2.5
220
4
0.6
1.5
5.25
5.25
-0.2
400
V
V
µA
mA
µA
T
A
= +85°C
T
A
= +25°C
T
A
= +85°C
50
200,000
50,000
Years
Stores
4
_______________________________________________________________________________________
10-Bit, Dual, Nonvolatile, Linear-Taper
Digital Potentiometers
TIMING CHARACTERISTICS
(V
DD
= +2.7V to +5.25V, V
SS
= GND = 0, V
H_
= V
DD
, V
L_
= 0, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at
V
DD
= +5.0V, T
A
= +25°C.) (Note 1)
PARAMETER
ANALOG SECTION
Wiper Settling Time (Note 6)
t
S
MAX5494/MAX5498
MAX5495/MAX5499
5
22
7
140
60
60
60
0
40
0
15
60
150
12
µs
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX5494–MAX5499
SPI-COMPATIBLE SERIAL INTERFACE (Figure 6)
SCLK Frequency
SCLK Clock Period
SCLK Pulse-Width High
SCLK Pulse-Width Low
CS
Fall to SCLK Rise Setup
SCLK Rise to
CS
Rise Hold
DIN to SCLK Setup
DIN Hold After SCLK
SCLK Rise to
CS
Fall Delay
CS
Rise to SCLK Rise Hold
CS
Pulse-Width High
Write NV Register Busy Time
f
SCLK
t
CP
t
CH
t
CL
t
CSS
t
CSH
t
DS
t
DH
t
CS0
t
CS1
t
CSW
t
BUSY
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ms
Note 1:
100% production tested at T
A
= +25°C and T
A
= +85°C. Guaranteed by design to T
A
= -40°C.
Note 2:
The DNL and INL are measured for the voltage-divider with H_ = V
DD
and L_ = V
SS
. The wiper terminal (W_) is unloaded
and measured with a high-input-impedance voltmeter.
Note 3:
The DNL and INL are measured with L_ = V
SS
= 0. For V
DD
= 5V, the wiper terminal is driven with a current source of I
W
=
80µA for the 50kΩ device and I
W
= 400µA for the 10kΩ device. For V
DD
= 3V, the wiper terminal is driven with a current
source of I
W
= 40µA for the 50kΩ device and I
W
= 200µA for the 10kΩ device.
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
DD
- 0.5V) and (GND +
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
MicroPython开源版块
