1.0 LM94021 Transfer Function

The LM94021 has four selectable gains, each of which can

be selected by the GS1 and GS0 input pins. The output

voltage for each gain, across the complete operating tem-

perature range is shown in the LM94021 Transfer Table,

below. This table is the reference from which the LM94021

accuracy specifications (listed in the Electrical Characteris-

tics section) are determined. This table can be used, for

example, in a host processor look-up table. A file containing

this data is available for download at www.national.com/

appinfo/tempsensors.

LM94021 Transfer Table

The output voltages in this table apply for V

Temperature

(˚C)

GS=00

(mV)

GS=01

(mV)

GS=10

(mV)

GS=11

(mV)

-50

1299

1955

2616

3277

-49

1294

1949

2607

3266

-48

1289

1942

2598

3254

-47

1284

1935

2589

3243

-46

1278

1928

2580

3232

-45

1273

1921

2571

3221

-44

1268

1915

2562

3210

-43

1263

1908

2553

3199

-42

1257

1900

2543

3186

-41

1252

1892

2533

3173

-40

1247

1885

2522

3160

-39

1242

1877

2512

3147

-38

1236

1869

2501

3134

-37

1231

1861

2491

3121

-36

1226

1853

2481

3108

-35

1221

1845

2470

3095

-34

1215

1838

2460

3082

-33

1210

1830

2449

3069

-32

1205

1822

2439

3056

-31

1200

1814

2429

3043

-30

1194

1806

2418

3030

-29

1189

1798

2408

3017

-28

1184

1790

2397

3004

-27

1178

1783

2387

2991

-26

1173

1775

2376

2978

-25

1168

1767

2366

2965

-24

1162

1759

2355

2952

-23

1157

1751

2345

2938

-22

1152

1743

2334

2925

-21

1146

1735

2324

2912

-20

1141

1727

2313

2899

-19

1136

1719

2302

2886

-18

1130

1711

2292

2873

-17

1125

1703

2281

2859

-16

1120

1695

2271

2846

-15

1114

1687

2260

2833

-14

1109

1679

2250

2820

The output voltages in this table apply for V

Temperature

(˚C)

GS=00

(mV)

GS=01

(mV)

GS=10

(mV)

GS=11

(mV)

-13

1104

1671

2239

2807

-12

1098

1663

2228

2793

-11

1093

1656

2218

2780

-10

1088

1648

2207

2767

-9

1082

1639

2197

2754

-8

1077

1631

2186

2740

-7

1072

1623

2175

2727

-6

1066

1615

2164

2714

-5

1061

1607

2154

2700

-4

1055

1599

2143

2687

-3

1050

1591

2132

2674

-2

1044

1583

2122

2660

-1

1039

1575

2111

2647

0

1034

1567

2100

2633

1

1028

1559

2089

2620

2

1023

1551

2079

2607

3

1017

1543

2068

2593

4

1012

1535

2057

2580

5

1007

1527

2047

2567

6

1001

1519

2036

2553

7

996

1511

2025

2540

8

990

1502

2014

2527

9

985

1494

2004

2513

10

980

1486

1993

2500

11

974

1478

1982

2486

12

969

1470

1971

2473

13

963

1462

1961

2459

14

958

1454

1950

2446

15

952

1446

1939

2433

16

947

1438

1928

2419

17

941

1430

1918

2406

18

936

1421

1907

2392

19

931

1413

1896

2379

20

925

1405

1885

2365

21

920

1397

1874

2352

22

914

1389

1864

2338

23

909

1381

1853

2325

24

903

1373

1842

2311

25

898

1365

1831

2298

26

892

1356

1820

2285

27

887

1348

1810

2271

28

882

1340

1799

2258

29

876

1332

1788

2244

30

871

1324

1777

2231

31

865

1316

1766

2217

32

860

1308

1756

2204

33

854

1299

1745

2190

34

849

1291

1734

2176

35

843

1283

1723

2163

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