TH72002

315MHz

ASK Transmitter

3901072002

Page 2 of 20

Data Sheet

Rev. 010

Jun/12

Document Content

1

Theory of Operation ...................................................................................................3

1.1

General .............................................................................................................................. 3

1.2

Block Diagram.................................................................................................................... 3

2

Functional Description ..............................................................................................4

2.1

Crystal Oscillator ................................................................................................................ 4

2.2

ASK Modulation ................................................................................................................. 4

2.3

Crystal Pulling .................................................................................................................... 4

2.4

Output Power Selection...................................................................................................... 5

2.5

Lock Detection ................................................................................................................... 5

2.6

Low Voltage Detection ....................................................................................................... 5

2.7

Mode Control Logic ............................................................................................................ 6

2.8

Timing Diagrams ................................................................................................................ 6

3

Pin Definition and Description ..................................................................................7

4

Electrical Characteristics ..........................................................................................8

4.1

Absolute Maximum Ratings................................................................................................ 8

4.2

Normal Operating Conditions ............................................................................................. 8

4.3

Crystal Parameters ............................................................................................................ 8

4.4

DC Characteristics ............................................................................................................. 9

4.5

AC Characteristics ........................................................................................................... 10

4.6

Output Power Steps ......................................................................................................... 10

5

Typical Operating Characteristics ..........................................................................11

5.1

DC Characteristics ........................................................................................................... 11

5.2

AC Characteristics ........................................................................................................... 14

6

Test Circuit ...............................................................................................................17

6.1

Test circuit component list to Fig. 18 ................................................................................ 17

7

Package Information ................................................................................................18

8

Standard information regarding manufacturability of Melexis products with

different soldering processes .................................................................................19

9

ESD Precautions ......................................................................................................19

10

Disclaimer .................................................................................................................20