Rainbow Electronics MAX5419 User Manual

General Description

The MAX5417/MAX5418/MAX5419 nonvolatile, linear­taper, digital potentiometers perform the function of a
mechanical potentiometer, but replace the mechanics
with a simple 2-wire digital interface, allowing communi­cation with multiple devices. Each device performs the
same function as a discrete potentiometer or variable
resistor and has 256 tap points.

The devices feature an internal, nonvolatile EEPROM
used to store the wiper position for initialization during
power-up. The fast-mode I2C™-compatible serial inter­face allows communication at data rates up to 400kbps,
minimizing board space and reducing interconnection
complexity in many applications. Each device is available
with one of four factory-preset addresses (see the
Selector Guide) and features an address input for a total
of eight unique address combinations.

The MAX5417/MAX5418/MAX5419 provide three nomi­nal resistance values: 50kΩ (MAX5417), 100kΩ
(MAX5418), or 200kΩ (MAX5419). The nominal resistor
temperature coefficient is 50ppm/°C end-to-end, and
only 5ppm/°C ratiometric. This makes the devices ideal
for applications requiring a low-temperature-coefficient
variable resistor, such as low-drift, programmable gain­amplifier circuit configurations.

The MAX5417/MAX5418/MAX5419 are available in a
3mm x 3mm 8-pin TDFN package, and are specified
over the extended -40°C to +85°C temperature range.

Applications

Mechanical Potentiometer Replacement
Low-Drift Programmable-Gain Amplifiers
Volume Control
Liquid-Crystal Display (LCD) Contrast Control

Features

♦ Power-On Recall of Wiper Position from

Nonvolatile Memory

♦ Tiny 3mm x 3mm 8-Pin TDFN Package
♦ 50ppm/°C End-to-End Resistance Temperature

Coefficient

♦ 5ppm/°C Ratiometric Temperature Coefficient
♦ 50kΩ/100kΩ/200kΩ Resistor Values
♦ Fast I

2

C-Compatible Serial Interface

♦ 500nA (typ) Static Supply Current
♦ Single-Supply Operation: +2.7V to +5.25V
♦ 256 Tap Positions
♦ ±0.5 LSB DNL in Voltage-Divider Mode
♦ ±0.5 LSB INL in Voltage-Divider Mode

MAX5417/MAX5418/MAX5419

256-Tap, Nonvolatile, I2C-Interface,

Digital Potentiometers

________________________________________________________________ Maxim Integrated Products 1

V

DD

GND

SDA
SCL

8-BIT

SHIFT

REGISTER

8-BIT

LATCH

8-BIT

NV

MEMORY

I2C

INTERFACE

A

0

8

8

256

W

L

256­POSITION
DECODER

H

POR

MAX5417

MAX5418

MAX5419

Ordering Information/Selector Guide

Functional Diagram

19-3185; Rev 1; 3/04

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.

Pin Configuration appears at end of data sheet.

I

2

C is a trademark of Philips Corp.

Purchase of I

2

C components from Maxim Integrated Products,
Inc. or one of its sublicensed Associated Companies, conveys
a license under the Philips I

2

C Patent Rights to use these com-

ponents in an I

2

C system, provided that the system conforms

to the I

2

C Standard Specification as defined by Philips.

*Future product—contact factory for availability.
**Exposed pad.

PART TEMP RANGE PIN-PACKAGE I2C ADDRESS R (kΩ) TOP MARK

MAX5417LETA -40°C to +85°C 8 TDFN-EP** 010100A

0

50 AIB

MAX5417META* -40°C to +85°C 8 TDFN-EP** 010101A

0

50 ALS

MAX5417NETA* -40°C to +85°C 8 TDFN-EP** 010110A

0

50 ALT

MAX5417PETA* -40°C to +85°C 8 TDFN-EP** 010111A

0

50 ALU

MAX5418LETA -40°C to +85°C 8 TDFN-EP** 010100A

0

100 AIC

MAX5418META* -40°C to +85°C 8 TDFN-EP** 010101A

0

100 ALV

MAX5418NETA* -40°C to +85°C 8 TDFN-EP** 010110A

0

100 ALW

MAX5418PETA* -40°C to +85°C 8 TDFN-EP** 010111A

0

100 ALX

MAX5419LETA* -40°C to +85°C 8 TDFN-EP** 010100A

0

200 AID

MAX5419META* -40°C to +85°C 8 TDFN-EP** 010101A

0

200 ALY

MAX5419NETA* -40°C to +85°C 8 TDFN-EP** 010110A

0

200 ALZ

MAX5419PETA* -40°C to +85°C 8 TDFN-EP** 010111A

0

200 AMA

MAX5417/MAX5418/MAX5419

256-Tap, Nonvolatile, I2C-Interface,
Digital Potentiometers

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VDD= +2.7V to +5.25V, H = VDD, L = GND, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VDD= +5V, TA= +25°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.

VDDto GND...........................................................-0.3V to +6.0V

All Other Pins to GND.................................-0.3V to (V

DD

+ 0.3V)

Maximum Continuous Current into H, L, and W

MAX5417......................................................................±1.3mA

MAX5418......................................................................±0.6mA

MAX5419......................................................................±0.3mA

Continuous Power Dissipation (T

A

= +70°C)

8-Pin TDFN (derate 24.4mW/°C above +70°C) .........1951mW

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

PARAMETER

SYMBOL

CONDITIONS MIN TYP MAX

UNITS

DC PERFORMANCE (VOLTAGE-DIVIDER MODE)

Resolution 256

Taps

Integral Nonlinearity INL (Note 1) ±0.5 LSB

Differential Nonlinearity DNL (Note 1) ±0.5 LSB

End-to-End Temperature
Coefficient

TC

R

50

ppm/°C

Ratiometric Temperature
Coefficient

5

ppm/°C

MAX5417_, 50Ω -0.6

Full-Scale Error

MAX5418_, 100kΩ -0.3

LSB

MAX5417_, 50kΩ 0.6

Zero-Scale Error

MAX5418_, 100kΩ 0.3

LSB

DC PERFORMANCE (VARIABLE-RESISTOR MODE)

V

DD

= 3V ±3

Integral Nonlinearity
(Note 2)

INL

V

DD

= 5V ±1.5

LSB

V

DD

= 3V, MAX5417_, 50kΩ,

guaranteed monotonic

-1 +2

VDD = 3V, MAX5418_, 100kΩ ±1

Differential Nonlinearity
(Note 2)

DNL

V

DD

= 5V ±1

LSB

DC PERFORMANCE (RESISTOR CHARACTERISTICS)

Wiper Resistance R

W

(Note 3) 325 675 Ω

Wiper Capacitance C

W

10 pF

MAX5417_ 37.5 50 62.5

End-to-End Resistance R

HL

MAX5418_ 75 100 125

kΩ

MAX5417/MAX5418/MAX5419

256-Tap, Nonvolatile, I2C-Interface,

Digital Potentiometers

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VDD= +2.7V to +5.25V, H = VDD, L = GND, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VDD= +5V, TA= +25°C.)

PARAMETER

SYMBOL

CONDITIONS MIN TYP MAX

UNITS

DIGITAL INPUTS

VDD = 3.4V to 5.25V 2.4

Input High Voltage (Note 4) V

IH

VDD < 3.4V

V

Input Low Voltage V

IL

V

DD

= 2.7V to 5.25V 0.8 V

Low-Level Output Voltage V

OL

3mA sink current 0.4 V

Input Leakage Current I

LEAK

±1 µA

Input Capacitance 5pF

MAX5417 100

Wiper -3dB Bandwidth (Note 5)

MAX5418 50

kHz

NONVOLATILE MEMORY

Data Retention 50

Years

Endurance

Stores

POWER SUPPLY

Power-Supply Voltage V

DD

2.70 5.25 V

Standby Current I

DD

Digital inputs = V

DD

or GND 0.5 1 µA

Programming Current

During nonvolatile write;
digital inputs = V

DD

or GND (Note 6)

200 400 µA

TIMING CHARACTERISTICS

(VDD= +2.7V to +5.25V, H = VDD, L = GND, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VDD= +5V, TA=
+25°C. See Figures 1 and 2.) (Note 7)

0.7 x V

DD

DYNAMIC CHARACTERISTICS

200,000

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

ANALOG SECTION

Wiper Settling Time (Note 8) t

DIGITAL SECTION

SCL Clock Frequency f

Setup Time for START Condition t

Hold Time for START Condition t

CLK High Time t

CLK Low Time t

SCL

SU-STA

HD-STA

HIGH

LOW

MAX5417 500

IL

MAX5418 600

ns

400 kHz

0.6 µs

0.6 µs

0.6 µs

1.3 µs

MAX5417/MAX5418/MAX5419

256-Tap, Nonvolatile, I2C-Interface,
Digital Potentiometers

4 _______________________________________________________________________________________

Note 1: The DNL and INL are measured with the potentiometer configured as a voltage-divider with H = VDDand L = GND. The

wiper terminal is unloaded and measured with a high-input-impedance voltmeter.

Note 2: The DNL and INL are measured with the potentiometer configured as a variable resistor. H is unconnected and L = GND.

For the 5V condition, the wiper terminal is driven with a source current of 80µA for the 50kΩ configuration, 40µA for the
100kΩ configuration, and 20µA for the 200kΩ configuration. For the 3V condition the wiper terminal is driven with a source
current of 40µA for the 50kΩ configuration, 20µA for the 100kΩ configuration, and 10µA for the 200kΩ configuration.

Note 3: The wiper resistance is measured using the source currents given in Note 2.
Note 4: The device draws current in excess of the specified supply current when this input is driven with a voltage greater than 0.7

x V

DD

. This is due to the complementary metal-oxide semiconductor (CMOS) shunt current (P- and N-channel output

devices on simultaneously).

Note 5: Wiper at midscale with a 10pF load. Potentiometer set to midscale, L = GND, an AC source is applied to H, and the output

is measured as 3dB lower than the DC W/H value in dB.

Note 6: The programming current operates only during power-up and NV writes.
Note 7: SCL clock period includes rise and fall times t

R

and tF. All digital input signals are specified with tR= tF= 2ns and timed

from a voltage level of (V

IL

+ VIH) / 2.

Note 8: Wiper settling time is the worst-case 0% to 50% rise time measured between consecutive wiper positions. H = V

DD

,
L = GND, and the wiper terminal is unloaded and measured with a 10pF oscilloscope probe (see the Typical Operating
Characteristics for the tap-to-tap switching transient).

Note 9: An appropriate bus pullup resistance must be selected depending on board capacitance. Refer to the document linked to

this web address: www.semiconductors.philips.com/acrobat/literature/9398/39340011.pdf

Note 10: The idle time begins from the initiation of the stop pulse.

PARAMETER

CONDITIONS

UNITS

Data Setup Time

100 ns

Data Hold Time

0 0.9 µs

SDA, SCL Rise Time t

R

300 ns

SDA, SCL Fall Time t

F

300 ns

Setup Time for STOP Condition

0.6 µs

Bus Free Time Between STOP
and START Condition

t

BUF

Minimum power-up rate = 0.2V/ms 1.3 µs

t

SP

50 ns

Maximum Capacitive Load for
Each Bus Line

C

B

(Note 9) 400 pF

Nonvolatile Store Time

Idle time required after a nonvolatile
memory write (Note 10)

30 ms

TIMING CHARACTERISTICS (continued)

(VDD= +2.7V to +5.25V, H = VDD, L = GND, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VDD= +5V, TA=
+25°C. See Figures 1 and 2.) (Note 7)

SYMBOL

t

SU-DAT

t

HD-DAT

t

SU-STO

Pulse Width of Spike Suppressed

MIN TYP MAX

MAX5417/MAX5418/MAX5419

256-Tap, Nonvolatile, I2C-Interface,

Digital Potentiometers

_______________________________________________________________________________________ 5

TAP-TO-TAP SWITCHING TRANSIENT

MAX5417 toc04

W
10mV/div

SDA
2V/div

1µs/div

MAX5417
C

L

= 10pF
FROM TAP 127
TO TAP 128
H = V

DD

WIPER TRANSIENT AT POWER-ON

(MAX5417)

MAX5417 toc05

W
1V/div

V

DD

2V/div

4µs/div

CL = 10pF
TAP = 128
H = V

DD

STANDBY SUPPLY CURRENT

vs. TEMPERATURE

MAX5417 toc01

TEMPERATURE (°C)

STANDBY SUPPLY CURRENT (µA)

603510-15

0.2

0.4

0.6

0.8

1.0

0

-40 85

WIPER RESISTANCE vs. TAP POSITION

(MAX5417)

MAX5417 toc02

TAP POSITION

RESISTANCE (Ω)

224192160128966432

100

200

300

400

500

600

700

0

0 256

VDD = 2.7V
I

SRC

= 50µA

END-TO-END RESISTANCE % CHANGE

vs. TEMPERATURE

MAX5417 toc03

TEMPERATURE (°C)

END-TO-END RESISTANCE % CHANGE

603510-15

-0.8

-0.6

-0.4

-0.2

0

0.2

0.4

0.6

0.8

1.0

-1.0

-40 85

Typical Operating Characteristics

(VDD= +5V, TA= +25°C, unless otherwise noted.)

MIDSCALE WIPER RESPONSE vs. FREQUENCY

(MAX5417)

MAX5417 toc06

FREQUENCY (kHz)

WIPER RESPONSE (dB)

10010

-25

-20

-10

-15

-5

MAX5417
TAP = 128

CL = 50pF

CL = 10pF

0

-30
1 1000

DNL vs. TAP POSITION

(MAX5417)

MAX5417 toc07

TAP POSITION

RESISTANCE DNL (LSB)

224192160128966432

-0.2

-0.1

0

0.1

0.2

0.3

0.4

0.5

-0.3
0 256

VARIABLE-RESISTOR MODE