Datasheet

73M2901CE Data Sheet DS_2901CE_031
2 Rev. 3.4
Table of Contents
1 Hardware Description .................................................................................................................... 4
1.1 Power Supply ....................................................................................................................... 4
1.2 Low Power Mode .................................................................................................................. 4
1.3 Analog Line / Hybrid Interface ............................................................................................... 4
1.4 Interrupt Pins ........................................................................................................................ 4
1.5 Crystal Oscillator................................................................................................................... 5
1.5.1 Specifying a Crystal ..................................................................................................... 5
1.6 Reset .................................................................................................................................... 5
1.7 Asynchronous and Synchronous Serial Data Interface .......................................................... 5
2 Pinout ............................................................................................................................................. 6
3 Pin Descriptions ............................................................................................................................ 7
3.1 Power Pins ........................................................................................................................... 7
3.2 Analog Interface Pins ............................................................................................................ 7
3.3 Digital Interface Pins ............................................................................................................. 7
3.4 External Interrupt Pins .......................................................................................................... 8
3.5 Oscillator Pins ....................................................................................................................... 8
4 Electrical Specifications ................................................................................................................ 9
4.1 Absolute Maximum Ratings................................................................................................... 9
4.2 Recommended Operating Conditions .................................................................................... 9
4.3 Receiver ............................................................................................................................... 9
4.4 Transmitter ......................................................................................................................... 10
4.5 Maximum Transmit Level .................................................................................................... 10
4.6 DC Characteristics, Vcc = 3.3 V .......................................................................................... 11
4.6.1 DC Supply Current, VDD = 2.7 V (Battery EOL) ......................................................... 11
4.6.2 DC Supply Current , VDD = 3.0 V .............................................................................. 11
4.6.3 DC Supply Current VDD = 3.3 V ................................................................................ 12
4.6.4 DC Supply Current VDD = 3.6 V ................................................................................ 12
5 Firmware Description .................................................................................................................. 13
5.1 Firmware Overview ............................................................................................................. 13
5.2 Firmware Features .............................................................................................................. 13
6 Design Considerations ................................................................................................................ 14
6.1 Layout Considerations ........................................................................................................ 14
6.2 73M2901CE Design Compatibility ....................................................................................... 15
6.3 Telephone Line Interface .................................................................................................... 15
6.4 Functional Considerations ................................................................................................... 16
6.4.1 SMS and V.23 Half Duplex ........................................................................................ 16
6.4.2 Leased Line Mode ..................................................................................................... 16
6.4.3 73M2901CE Energy Ring Detection .......................................................................... 17
6.4.4 Caller ID Mode Changes ........................................................................................... 18
6.4.5 Selectable Answer Tone Frequency Detection ........................................................... 18
6.4.6 73M2901CE S99 Country Code Support ................................................................... 18
7 Reference Designs ...................................................................................................................... 21
7.1 Low Cost Design Using DSP Ring and Status Monitoring .................................................... 21
7.2 Reference Design Using Traditional Hardware Line Monitoring ........................................... 22
8 Modem Performance Characteristics ......................................................................................... 23
8.1 BER versus SNR ................................................................................................................ 23
8.2 BER versus Receive Level .................................................................................................. 23
9 Package Mechanical Drawing ..................................................................................................... 24
9.1 32-Pin QFN ........................................................................................................................ 24
9.2 32-Pin TQFP....................................................................................................................... 25
10 Ordering Information ................................................................................................................... 26
11 Related Documentation ............................................................................................................... 26
12 Contact Information ..................................................................................................................... 26
Revision History .................................................................................................................................. 27