Datasheet

73M1903 Data Sheet DS_1903_032
2 Rev. 2.1
Table of Contents
1 Signal Description ......................................................................................................................... 4
1.1 Serial Interface ........................................................................................................................ 5
2 Control and Status Registers ........................................................................................................ 8
2.1 GPIO .................................................................................................................................... 10
2.1.1 GPIO Data (GPIO): Address 02h .............................................................................. 10
2.1.2 GPIO Direction (DIR): Address 03h .......................................................................... 10
2.2 Analog I/O ............................................................................................................................. 10
2.2.1 Control Register (CTRL 11): Address 0Bh ................................................................. 11
2.2.2 Control Register (CTRL 12): Address 0Ch ................................................................. 11
2.2.3 Control Register (CTRL 13): Address 0Dh ................................................................. 12
2.2.4 Control Register (CTRL 14): Address 0Eh ................................................................. 12
3 Clock Generation ......................................................................................................................... 13
3.1 Crystal Oscillator and Pre-scaler NCO................................................................................... 13
3.1.1 Control Register (CTRL 8): Address 08h .................................................................... 13
3.1.2 Control Register (CTRL 9): Address 09h .................................................................... 13
3.1.3 Control Register (CTRL 10): Address 0Ah ................................................................. 13
4 Modem Receiver .......................................................................................................................... 18
5 Modem Transmitter ..................................................................................................................... 21
5.1 Transmit Levels..................................................................................................................... 22
5.2 Transmit Power - dBm........................................................................................................... 23
5.3 Control Register (CTRL1): Address 00h ............................................................................... 23
5.4 Control Register (CTRL2): Address 01h ............................................................................... 24
5.5 Revision Register: Address 06h ............................................................................................ 24
6 Test Modes................................................................................................................................... 25
7 Power Saving Modes ................................................................................................................... 25
8 Electrical Specifications .............................................................................................................. 26
8.1 Absolute Maximum Ratings ................................................................................................... 26
8.2 Recommended Operating Conditions .................................................................................... 26
8.3 Digital Specifications ............................................................................................................. 27
8.3.1 DC Characteristics..................................................................................................... 27
8.3.2 AC Timing ................................................................................................................. 28
8.4 Analog Specifications ............................................................................................................ 29
8.4.1 DC Specifications ...................................................................................................... 29
8.4.2 AC Specifications ...................................................................................................... 29
8.5 Performance ......................................................................................................................... 30
8.5.1 Receiver .................................................................................................................... 30
8.5.2 Transmitter ................................................................................................................ 31
9 Pinouts ......................................................................................................................................... 33
9.1 32-Pin QFN Pinout ................................................................................................................ 33
9.2 20-Pin TSSOP Pinout ........................................................................................................... 34
10 Mechanical Specifications .......................................................................................................... 35
10.1 32-Pin QFN Mechanical Drawings ......................................................................................... 37
10.2 20-Pin TSSOP Mechanical Drawings .................................................................................... 38
11 Ordering Information ................................................................................................................... 39
Appendix A – 73M1903 DAA Resistor Calculation Guide .................................................................. 40
Appendix B – Crystal Oscillator .......................................................................................................... 42
Revision History .................................................................................................................................. 47