Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsData collecting ICsData acquisition IC - AD converter (ADC) External , Internal SSOP 16

General Description

The MAX1098/MAX1099 implement both local and

remote temperature sensing with 10-bit resolution, using

+5V and +3V supply voltages, respectively. Accuracy

is ±1°C from 0°C to +70°C, with no calibration needed.

The devices feature an algorithmic switched-capacitor

analog-to-digital converter (ADC), on-chip clock, and

3-wire serial interface compatible with SPI, QSPI™, and

MICROWIRE

The MAX1098/MAX1099 also perform fully differential

voltage measurements with 10-bit resolution and separate

track-and-hold (T/N) for positive and negative inputs. Both

devices accept versatile input modes consisting of two

3-channel signal pairs, five 1-channel signals relative to

AIN5, or V

/4 relative to ground. An external reference

may be used for more accurate voltage measurements.

Typical power consumption is only 1.3mW (MAX1099). A

shutdown mode and two standby modes provide multiple

strategies for prolonging battery life in portable applica-

tions that require limited sampling throughput.

The MAX1098/MAX1099 are available in 16-pin SSOP

packages.

Applications

● Temperature/Voltage Supervision of

Workstations and Communications Equipment

● Hand-Held Instruments

● Medical Equipment

● Industrial Process Control

Features

● Local and Remote Temperature Sensing

● 12-Bit Resolution for Temperature and 10-Bit

Resolution for Voltage Inputs

● ±1°C Accuracy from -40°C to +85°C

● Fully Differential Inputs

● Single-Supply Operation

• +4.75V to +5.25V (MAX1098)

• +2.7V to +3.6V (MAX1099)

● 3-Wire SPI/QSPI/MICROWIRE-Compatible Interface

● Internal Precision Voltage Reference

• 2.50V (MAX1098)

• 1.20V (MAX1099)

● Space-Saving 16-Pin SSOP Package

19-1728; Rev 1; 3/12

QSPI is a trademark of Motorola, Inc.

MICROWIRE is a registered trademark of National

Semiconductor Corp.

Typical Operating Circuit appears at end of data sheet.

+Denotes a lead(Pb)-free/RoHS-compliant package.

PART

TEMP

RANGE

PIN-

PACKAGE

TEMP. SENSE

ACCURACY

(°C)

MAX1098CEAE+ -40°C to +85°C 16 SSOP ±4.0

MAX1099CEAE+ -40°C to +85°C 16 SSOP ±4.0

AIN1 AIN0

AIN5

REF

GND

SCLK

DIN

COUT

TOP VIEW

MAX1098

MAX1099

SSOP

SHO

AIN2

GND

AIN3

AIN4

SSTRB

-1.0

-0.5

0.5

1.0

-60 -20 20 60-40 0 40 80 100

MAX1098

TEMPERATURE ERROR

vs. INTERNAL DIODE TEMPERATURE

MAX1098/9-29

TEMPERATURE (°C)

TEMPERATURE ERROR (°C)

MAX1098/MAX1099 10-Bit Serial-Output Temperature Sensors

with 5-Channel ADC

Pin Conguration Temperature Error

Ordering Information

Summary of content (20 pages)

PAGE 1
MAX1098/MAX1099 10-Bit Serial-Output Temperature Sensors with 5-Channel ADC General Description The MAX1098/MAX1099 implement both local and remote temperature sensing with 10-bit resolution, using +5V and +3V supply voltages, respectively. Accuracy is ±1°C from 0°C to +70°C, with no calibration needed. The devices feature an algorithmic switched-capacitor analog-to-digital converter (ADC), on-chip clock, and 3-wire serial interface compatible with SPI, QSPI™, and MICROWIRE®.
PAGE 2
MAX1098/MAX1099 10-Bit Serial-Output Temperature Sensors with 5-Channel ADC Absolute Maximum Ratings VDD to GND.............................................................-0.3V to +6V SHO to GND.............................................. -0.3V to (VDD + 0.3V) Analog Inputs to GND (AIN0–AIN5, REF)................................. -0.3V to (VDD + 0.3V) Digital Inputs to GND (DIN, SCLK, CS).... -0.3V to (VDD + 0.3V) Digital Outputs to GND (DOUT, SSTRB).. -0.3V to (VDD + 0.3V) Digital Output Sink Current.
PAGE 3
MAX1098/MAX1099 10-Bit Serial-Output Temperature Sensors with 5-Channel ADC Electrical Characteristics (continued) (VDD = +4.75V to +5.25V (MAX1098), VDD = +2.7V to +3.6V (MAX1099), external reference, VREF = +2.5V (MAX1098), VREF = +1.2V (MAX1099), fSCLK = 2.5MHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 4
MAX1098/MAX1099 10-Bit Serial-Output Temperature Sensors with 5-Channel ADC Electrical Characteristics (continued) (VDD = +4.75V to +5.25V (MAX1098), VDD = +2.7V to +3.6V (MAX1099), external reference, VREF = +2.5V (MAX1098), VREF = +1.2V (MAX1099), fSCLK = 2.5MHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS EXTERNAL VOLTAGE REFERENCE CHARACTERISTICS Reference Voltage Range VREF REF Input Resistance MAX1098 0.8 2.
PAGE 5
MAX1098/MAX1099 10-Bit Serial-Output Temperature Sensors with 5-Channel ADC Timing Characteristics (VDD = +4.75V to +5.25V (MAX1098), VDD = +2.7V to +3.6V (MAX1099), external reference, VREF = +2.5V (MAX1098), VREF = +1.2V (MAX1099), fSCLK = 2.5MHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Figures 4, 6) PARAMETER SCLK Frequency SYMBOL CONDITIONS MIN fSCLK TYP MAX UNITS 2.
PAGE 6
MAX1098/MAX1099 10-Bit Serial-Output Temperature Sensors with 5-Channel ADC Typical Operating Characteristics (TA = +25°C, unless otherwise noted.) 0.10 0.05 0 -0.05 -0.10 -0.15 -625 625 0.05 0 -0.05 -0.10 -0.15 -0.20 -625 MAX1098/9-03 0.05 0 -0.05 -0.10 -0.15 -0.20 -625 0 625 MAX1099 DIFFERENTIAL NONLINEARITY vs. OUTPUT CODE MAX1098 SUPPLY CURRENT vs. SUPPLY VOLTAGE (VOLTAGE MEASUREMENT MODE) MAX1099 SUPPLY CURRENT vs. SUPPLY VOLTAGE (VOLTAGE MEASUREMENT MODE) 0 -0.05 -0.10 -0.
PAGE 7
MAX1098/MAX1099 10-Bit Serial-Output Temperature Sensors with 5-Channel ADC Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.) 350 EXTERNAL REFERENCE 300 250 200 150 EXTERNAL REFERENCE 300 450 250 200 150 300 250 200 150 100 50 50 50 0 0 -20 0 20 40 60 80 0 20 40 60 0 80 -40 -20 0 20 40 60 80 TEMPERATURE (°C) TEMPERATURE (°C) MAX1098 POWER-DOWN SUPPLY CURRENT vs. SUPPLY VOLTAGE MAX1099 POWER-DOWN SUPPLY CURRENT vs.
PAGE 8
MAX1098/MAX1099 10-Bit Serial-Output Temperature Sensors with 5-Channel ADC Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.) 2.49 -20 0 20 40 60 -20 0 20 40 60 -0.250 80 4.8 4.9 5.0 5.1 5.2 MAX1098 OFFSET vs. TEMPERATURE MAX1099 OFFSET vs. TEMPERATURE 0.125 OFFSET (LSB) 0 0 -0.125 2.7 2.9 3.1 3.3 -0.250 3.5 0.250 MAX1098/9-24 MAX1098/9-22 0.250 0.125 0 -0.125 -40 -20 0 20 40 60 -0.
PAGE 9
MAX1098/MAX1099 10-Bit Serial-Output Temperature Sensors with 5-Channel ADC Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.) 0.5 0 -0.5 1.5 1.0 0.5 0 -0.5 -1.0 -1.5 -1.0 -60 -40 -20 0 20 40 TEMPERATURE (°C) www.maximintegrated.com 60 80 100 -2.0 MAX1099 TEMPERATURE ERROR vs. REMOTE DIODE TEMPERATURE 2.0 MAX1098/9-32 MAX1098/9-31 2.0 TEMPERATURE ERROR (°C) MAX1098/9-30 TEMPERATURE ERROR (°C) 1.0 MAX1098 TEMPERATURE ERROR vs.
PAGE 10
MAX1098/MAX1099 10-Bit Serial-Output Temperature Sensors with 5-Channel ADC Pin Description PIN NAME FUNCTION 1 AIN1 Analog Input 1. Negative differential input relative to AIN0 or positive differential input relative to AIN5 (see Table 5). Connect to the cathode of external diode 1 for remote temperature sensing. 2 SHO Shield Output. Connect to the shields of twisted-pair input cables used for remote temperature measurements (see Remote Diode Shielding). Leave unconnected for other applications.
PAGE 11
MAX1098/MAX1099 10-Bit Serial-Output Temperature Sensors with 5-Channel ADC CS SCLK INPUT REGISTER DIN OUTPUT REGISTER MAX1098/MAX1099 DIODE BIAS CONTROL DOUT CONTROL LOGIC CLOCK AIN0 AIN1 IN+ T/H AIN2 AIN3 INPUT MUX AIN4 ADC AIN5 IN- T/H VDD GND VDD/4 SHIELD OUTPUT SHO REF REF Figure 1.
PAGE 12
MAX1098/MAX1099 10-Bit Serial-Output Temperature Sensors with 5-Channel ADC TIMING/CONTROL LOGIC RIN 40kΩ IN+ T/H CHOLDP 4pF FULLY DIFFERENTIAL A/D OUTPUT RIN 40kΩ IN- T/H CHOLDN 4pF TRACK AND HOLD REF RR 30kΩ CREF 4pF GAIN OF 2 Figure 2. Converter Input Structure Converter Operation Figure 2 shows a simplified model of the converter input structure. Once initiated, a voltage conversion requires 64 fCLK periods, where fCLK is the internal master clock.
PAGE 13
MAX1098/MAX1099 10-Bit Serial-Output Temperature Sensors with 5-Channel ADC SSTRB FCLK 13 fCLKs WARMUP REF ACQUISITION 1 REF ACQUISITION 2 INPUT ACQUISITION fCLKS CONVERSION CYCLE 1 3 fCLKs WRITE TO OUTPUT REGISTER CONVERSION CYCLES 2–12 REFERENCE SAMPLING Figure 3a.
PAGE 14
MAX1098/MAX1099 10-Bit Serial-Output Temperature Sensors with 5-Channel ADC CS t CS t CSS t CS0 t CH t CS1 t CSH SCLK X DIN t CL t DH t DS VALID t DV X VALID VALID t DO X t TR DOUT Figure 4. Detailed Serial Interface Timing Output Data Format OUTPUT CODE 0111111111 0111111110 0000000010 0000000001 0000000000 1111111111 1111111110 1111111101 Output data from the MAX1098/MAX1099 are clocked onto DOUT on the falling edge of SCLK in the form of two 8-bit words, MSB first (Table 5).
PAGE 15
MAX1098/MAX1099 10-Bit Serial-Output Temperature Sensors with 5-Channel ADC Table 1. Configuration-Byte Format BIT 7 (MSB) BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 (LSB) Start 0 0 0 0 PM1 PM0 REF BIT NAME 7 (MSB) Start DESCRIPTION First logic 1 after CS goes low. (See Input Data Format.) 6, 5, 4, 3 Must be 0000 to load a configuration byte. 2, 1 PM1, PM0 0 REF These 2 bits select the desired power mode (Table 3). A logic high enables the internal reference.
PAGE 16
MAX1098/MAX1099 the power requirement of an internal reference buffer amplifier that can accommodate external loads. Temperature conversions at 100% duty cycle increase supply currents to 440μA (400μA) through additional amplification, buffer, and bias circuitry that is otherwise inactive. Place the MAX1098/MAX1099 in a low-current powerdown state between conversions to conserve power. Select standby, standby plus, or shutdown through bits PM1 and PM0 of the initialization byte (Table 3).
PAGE 17
MAX1098/MAX1099 10-Bit Serial-Output Temperature Sensors with 5-Channel ADC Table 4.
PAGE 18
MAX1098/MAX1099 SHIELD 10-Bit Serial-Output Temperature Sensors with 5-Channel ADC ANODE Definitions Relative Accuracy Relative accuracy is the deviation of the values on an actual transfer function from a straight line. This straight line can be either a best-straight-line fit or a line drawn between the endpoints of the transfer function, once offset and gain errors have been nullified. The static linearity parameters for the MAX1098/MAX1099 are measured using the best-straight-line fit method.
PAGE 19
MAX1098/MAX1099 10-Bit Serial-Output Temperature Sensors with 5-Channel ADC Typical Operating Circuit 0.1µF +5V VDD AIN0 AIN1 2N3904 2N3904 CS MAX1098 (SHIELD) AIN2 SCLK AIN3 DIN SHO DOUT AIN4 SSTRB AIN5 GND GND Package Information For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only.
PAGE 20
MAX1098/MAX1099 10-Bit Serial-Output Temperature Sensors with 5-Channel ADC Revision History REVISION NUMBER REVISION DATE PAGES CHANGED 0 7/00 Initial release 1 3/12 Removed A and B grades, updated style throughout data sheet. DESCRIPTION — 1, 2, 4, 16 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.