MAXIM MAX6603 Technical data

General Description

The MAX6603 dual-channel, platinum RTD-to-voltage
signal conditioner excites and amplifies the signal from
two external 200Ω platinum-resistive temperature
devices (Pt RTD) to achieve high-voltage, level-filtered
signals for temperature measurements. The MAX6603
provides a direct ratiometric output voltage to simplify
the interface to microcontrollers with integrated analog­to-digital converters (ADCs). External precision resis­tors and calibration processes are not needed. The
MAX6603 provides the necessary signal-conditioning
functions, including ratiometric excitation current,
amplification, buffered voltage outputs, diagnostic fault
detections, and input protection. The MAX6603 ampli­fies signals from two RTDs operating over the -40°C to
+1000°C temperature range and provides the tempera­ture information as two independent analog voltages.
The MAX6603 features a ±6°C (max) accuracy over the
+400°C to +600°C temperature range.

The MAX6603 has overvoltage protection up to +16V
on RTD inputs, and ±5kV electrostatic discharge (ESD)
protection at RTD input pins for reliable operation
where RTD temperature-sensing probes are used. The
MAX6603 monitors the RTD for faults and asserts the
respective DG output low for fault conditions. The ana­log voltage outputs can be readily connected to a vari­ety of microcontrollers.

The MAX6603 is available in a small, 10-pin TDFN-EP
package and operates over the -40°C to +125°C auto­motive temperature range from a single +3V to +5.5V
power supply.

Applications

Automotive Exhaust Temperature Monitoring

Engine Control Management to Meet EURO IV
Regulations

Braking Systems

Industrial Temperature Sensors

Food Transportation Monitoring Systems

Industrial Process Measurements

Features

♦ Amplifies Pt RTD Temperature Signals

♦ ±5kV ESD Protection on RTD Inputs

♦ +16V Overvoltage Fault Protection on RTD Inputs

♦ Low RTD Excitation Current Minimizes Self-

Heating Errors

♦ Small, 10-Pin TDFN Package

♦ Fully Ratiometric Operation

♦ No Calibration Required for Standard RTDs

♦ RTD Diagnostic Check

♦ High Accuracy: ±6°C (max) from +400°C to +600°C

MAX6603

Dual-Channel, Platinum

RTD-to-Voltage Signal Conditioner

________________________________________________________________ Maxim Integrated Products 1

1

3

4

10

+

8

7

OUT1

V

CC

RS2+

RS1+

MAX6603

29

OUT2RS2-

56

GNDRS1-

TDFN

3mm x 3mm x 0.8mm

TOP VIEW

DG2

DG1

Pin Configuration

Ordering Information

19-3975; Rev 0; 4/06

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.

PART PIN-PACKAGE

PKG

CODE

MAX6603ATB+ 10 TDFN-EP*

T1033-1

EVALUATION KIT

AVAILABLE

Note: Device is specified over the -40°C to +125°C tempera-

ture range.

*EP = Exposed pad.
+Denotes lead-free package.
**Other base resistance values can be accommodated.

Contact the factory for more information.

RTD

200Ω**

MAX6603

Dual-Channel, Platinum RTD-to-Voltage
Signal Conditioner

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VCC= 3.0V to 5.5V, resistor connected between RS1+ and RS1- = 560Ω, resistor connected between RS2+ and RS2- = 560Ω,
T

A

= -40°C to +125°C, unless otherwise noted. Typical values are at VCC= 5.0V, RL= 47kΩ between OUT_ and GND, TA= +25°C.)

(Note 1)

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.

(All voltages referenced to GND, unless otherwise noted.)
V

CC

........................................................................-0.3V to +6.0V

RS1+, RS1-, RS2+, RS2- .....................................-0.3V to +18.0V

OUT1, OUT2, DG1, DG2 ............................-0.3V to (V

CC

+ 0.3V)

Continuous Power Dissipation (T

A

= +70°C)
10-Pin TDFN Single-Layer Board

(derate 18.5 mW/°C above +70°C).........................1481.5mW

10-Pin TDFN Multilayer Board

(derate 24.4 mW/°C above +70°C).........................1951.2mW

ESD Protection (OUT1, OUT2, DG1, DG2,

Human Body Model) .....................................................> ±2kV

ESD Protection (RS1+, RS2+, RS1-, RS2-,

V

CC

, GND, Human Body Model) ..................................> ±5kV

Operating Temperature Range .........................-40°C to +125°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Supply Voltage V

CC

3.0 5.5 V

Input Over Voltage V

RS

RS1+, RS1-, RS2+, RS2- 16 V

3.9 5.5

Supply Current I

CC

Sink current during overvoltage fault

mA

CURRENT SOURCES

Excitation Current I

EXC

(Note 2)

1.0

mA

Excitation-Current Temperature
Coefficient

TCI

EXC

(Note 2) -7

ppm/°C

Minimum RS_- Voltage V

RS_-

3.4 V

Maximum RS_+ Voltage V

RS_+

4.0 V

Supply Ratiometric I

RATIO

VCC = +3V to +5.5V 0.2

mA/V

MAXIMUM TEMPERATURE ERROR (Note 3)

+400°C to +600°C, VCC = 5.0V ±6

-40°C to +400°C, VCC = 5.0V ±8

+600°C to +1000°C, VCC = 5.0V ±12

+400°C to +600°C, VCC = 3.0V ±10

-40°C to +400°C, VCC = 3.0V

RTD

+600°C to +1000°C, VCC = 3.0V ±20

°C

V

= V

RS1+

RS1 -

= V

RS2+

= V

= +16V

RS2-

0.58

36.2 47.1

1.12

±13.3

MAX6603

Dual-Channel, Platinum RTD-to-Voltage

Signal Conditioner

_______________________________________________________________________________________ 3

Note 1: All parameters are tested at TA= +25°C. Specifications over temperature are guaranteed by design.
Note 2: RTD resistance range is 150Ω to 900Ω for constant excitation current.
Note 3: A typical 200Ω RTD: R(T) = R

O

[1 + AT + BT2] is referenced for probe temperature-probe resistance relation. The parame-

ters in this section are not tested and are for reference only.

Note 4: RTD resistance is tested only at R

RTD

= 200Ω, 560Ω, 845Ω. The range is guaranteed by design.

Note 5: Parameters are tested in special test mode.

ELECTRICAL CHARACTERISTICS (continued)

(VCC= 3.0V to 5.5V, resistor connected between RS1+ and RS1- = 560Ω, resistor connected between RS2+ and RS2- = 560Ω,
T

A

= -40°C to +125°C, unless otherwise noted. Typical values are at VCC= 5.0V, RL= 47kΩ between OUT_ and GND, TA= +25°C.)

(Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

MAXIMUM INPUT RESISTANCE-TO-OUTPUT VOLTAGE ERROR

494Ω to 627Ω, VCC = 5.0V 19

200Ω to 494Ω, VCC = 5.0V 27

627Ω to 866Ω, VCC = 5.0V 33

494Ω to 627Ω, VCC = 3.0V 19

200Ω to 494Ω, VCC = 3.0V 27

RTD (Note 4)

627Ω to 866Ω, VCC = 3.0V 33

mV

ANALOG OUTPUTS (OUT1, OUT2)

Output-Voltage Low (Max) V

OL

RL = 47kΩ between OUT_ and V

CC

(Note 5)

0.1 V

Output-Voltage High (Min) V

OH

RL = 47kΩ between OUT_ and GND
(Note 5)

VCC -

0.1

V

V

OUT

= V

CC

22 mA

Short-Circuit Current I

SC

V

OUT

= GND 12 mA

Maximum Capacitive Load C

L

500 pF

Minimum Resistive Load R

L

Between OUT_ and GND 20 kΩ

DIAGNOSTIC OUTPUTS (DG1, DG2)

Output-Voltage Low V

OL

I

SOURCE

= 1mA 0.2 V

Output-Voltage High V

OH

I

SINK

= 1mA

V

CC

-

0.2

V

Minimum Resistance for RS+,
RS - Open

Ω

Maximum Resistance for RS+,
RS - Short

60 Ω

R

RS - OPEN

R

RS - SHORT

8000