73m2901ce Maxim Integrated Products, Inc., 73m2901ce Datasheet
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73m2901ce
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73m2901ce Summary of contents
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... Simplifying System Integration™ DS_2901CE_031 DESCRIPTION The 73M2901CE low speed modem integrates a data pump, controller, and analog front end in a 3.3 V device with a powerful "AT" command host interface. The modem reduces external component count/cost by incorporating many features like parallel phone detect, Line-In-Use and Ring detection in software without requiring additional components ...
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... 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 ...
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... Figure 1: 32-Pin QFN Pinout ................................................................................................................ 6 Figure 2: 32-Pin TQFP Pinout .................................................................................................................. 6 Figure 3: Low Cost Design Using DSP Ring and Status Monitoring ........................................................ 21 Figure 4: 73M2901CE Worldwide Demo Board: Daughter Board Schematic .......................................... 22 Figure 5: BER versus SNR .................................................................................................................... 23 Figure 6: BER versus Receive Level ...................................................................................................... 23 Figure 7: 32-Pin QFN Drawing ............................................................................................................... 24 Figure 8: 32-Pin TQFP Drawing ............................................................................................................. 25 Tables Table 1: 73M2901CE QFN and TQFP Pinout ...
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... Reduced external hardware support required with energy incoming ring detection. 1.1 Power Supply Power is supplied to the 73M2901CE by the VPD and VPA pins. The 73M2901CE is designed for a single +3.6 to +2.7 volt supply and for low power consumption (~30mW @ 3.0 volts). Ground is supplied to the 73M2901CE by the VND and VNA pins. ...
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... The signals DCD, CTS and DSR will be held inactive for 25 ms, acknowledging the reset operation, within a 250 ms time window after the reset-triggering event. The 73M2901CE is ready for operation after the 250 ms window and/or after the signals DCD, CTS and DSR become active. ...
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... Data Sheet 2 Pinout The 73M2901CE is available in a 32-pin QFN or 32-pin TQFP package. Table 1 lists the pins for both packages. Table 1: 73M2901CE QFN and TQFP Pinout Pin Name Pin 1 VND 9 2 VPD 10 DCD 3 11 DSR 4 12 CTS 5 13 RTS USR11 ...
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... Line In Use circuitry. I/O Programmable I/O port. This pin can optionally be used to control an external switch for caller ID operation. I Request to send O Clear to send O Data set ready O Data carrier detect O Ring indicator O Relay driver output I/O Programmable I/O port 73M2901CE Data Sheet 7 ...
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... Data Sheet 3.4 External Interrupt Pins Pin Name Pin Number RING 30 DTR 28 3.5 Oscillator Pins Pin Name Pin Number OSCIN 19 OSCOUT 18 8 Type Description I External interrupt – Line interface ring detection circuitry input External interrupt – DTE DTR signal input I Type Description ...
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... V to VPD + 0.5 V -55 ºC to 150 ºC Rating 2 3.6 V 11.0592 MHz +/- 50 ppm -40 º ºC Min -43 -48 -43 150 18.8 0.587 nd rd and 3 harmonic 2 ; dBm=10log(V /(1mW)(600Ω)) rms 73M2901CE Data Sheet Nominal Max Units 1 dBm0 1 dBm0 dBm0 -70 -65 dB kΩ 19.3 19.8 dB 0.622 ...
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... Data Sheet 4.4 Transmitter Parameter Conditions ITU Guard tone power 550 Hz (relative to carrier) 1800 Hz (relative to carrier) Calling Tone 1300 Hz Answer Tone power 2225 Hz / 2100 Hz DTMF Transmit power High band tones Low band tones Gain adjust tolerance By step Total Harmonic Distortion 1 kHz sine wave at output ...
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... Vss<Vin<Vdd Conditions Vdd=3.3 V Vdd=3.3 V Vdd=3.3 V, steady state Symbol Conditions IDD1 30 pF/pin IDD2 30 pF/pin IDD3 30 pF/pin Symbol Conditions IDD1 30 pF/pin IDD2 30 pF/pin IDD3 30 pF/pin 73M2901CE Data Sheet Min Nom Max Unit -0.5 0.8 -0.5 0.2 Vdd 0.7 Vdd +5.5 0.7 Vdd Vdd+0.5 0.45 0.7 Vdd-0.45 Vdd-0 Min Nom ...
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... Data Sheet 4.6.3 DC Supply Current VDD = 3.3 V Parameter Maximum power supply, normal operation Maximum power supply, Idle mode Maximum power supply, Power Down mode 4.6.4 DC Supply Current VDD = 3.6 V Parameter Maximum power supply, normal operation Maximum power supply, Idle mode Maximum power supply, Power ...
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... Register space in the modem. This will allow the OEM user to modify parameters such as filter response and transmit levels through the AT command set using proprietary commands. The host processor can also access the modem I/O port pins, providing extended I/O capability. Refer to the 73M2901CE AT Command User Guide for a complete description of the software. 5.1 Firmware Overview The modem always powers up in the idle (on hook) mode. “ ...
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... The values of C2 and C3 depend on the load capacitance rating of the crystal that is used, not the 73M2901CE. This load capacitance will typically be between 15 pF and 27 pF, but usually pF. Parallel resonant crystals are tuned with a specific capacitive load and will be within their specifications when this load is used ...
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... From a hardware standpoint, the key differences involve the User I/O pins USR10 and USR11, the ASRCH pin and the HBDEN pin. An additional user I/O pin, USR20, replaces the ASRCH pin on the 73M2901CE. This pin may remain safely connected to TXD as long as the host software does not reconfigure USR20 as an output (S104 bit0=0). ...
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... SMS (Short messaging Services) is the communications mode used to transmit text messages for cell phones and eventually wire line phones as well (see the 73M2901CE SMS and Half Duplex V.23 Operation application note). The V.23 half duplex mode has been included with the addition of the B10 command (ATB10) ...
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... Energy Ring Detection The 73M2901CE has a feature that was added with the intention of lowering the total modem cost by eliminating some of the more expensive external components. The threshold for the ring detector depends on the setting of the S123 register and the components in the Caller ID path, especially the transformer ...
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... TYPE II snoop mode is enabled when S95=$99 (99 hex). In this mode the modem will report either a TYPE I or TYPE II Caller ID message when the modem is on hook. If another Caller ID device is off hook the modem will detect the Caller ID handshake and output the Caller ID data, but the 73M2901CE will not actively participate otherwise. ...
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... S12 bits 4-6. Additional adjustment of the transmit level is provided by S85, but setting S85 at too high of a level can also increase the THD, so restraint is advised. DTMF should be transmitted at the highest level allowed by country specific limitations, but do not exceed this limit. Rev. 3.4 73M2901CE Data Sheet 19 ...
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... S13 bit 3 is ignored. 6.4.6.8 Caller ID – Type I and Type II The 73M2901CE supports worldwide Caller ID (CID) standards. Most of the CID controls are in register S95, but some are also found in other registers. Looking for the Japanese CID and Type II snoop mode Marking preamble are controlled by S72 bit 5 ...
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... DS_2901CE_031 7 Reference Designs 7.1 Low Cost Design Using DSP Ring and Status Monitoring Figure 3: Low Cost Design Using DSP Ring and Status Monitoring Rev. 3.4 73M2901CE Data Sheet 21 ...
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... RING 5 DSRB RELAY B 31 RELAY 4 CTSB RTSB 2 1 VCC3_3A L4 NLV32T-4R7J- 3.3uF VCC3_3D Figure 4: 73M2901CE Worldwide Demo Board: Daughter Board Schematic 22 C20 150nF SOIC14 R24 750 4 U2C 74LVC4066D AUST C25 115nF R26 820 C3 11 33pF U2B 74LVC4066D US600 VCC3_3 VCC3_3D C13 ...
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... The width of the bowl of these curves, taken at the BER break points is the measure of the dynamic range. Figure 5: BER versus SNR Rev. 3.4 73M2901CE Data Sheet Figure 6: BER versus Receive Level 23 ...
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... Data Sheet 9 Package Mechanical Drawing 9.1 32-Pin QFN 5 2 TOP VIEW 0.2 MIN. 0.35 / 0.45 24 0.85 NOM. 3.0 / 3.75 0.18 / 0.3 1.5 / 1.875 0.25 0.5 BOTTOM VIEW Figure 7: 32-Pin QFN Drawing DS_2901CE_031 / 0.9MAX. 0.00 / 0.005 0.20 REF. SEATING PLANE SIDE VIEW CHAMFERED 0. Rev. 3.4 ...
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... DS_2901CE_031 9.2 32-Pin TQFP Rev. 3.4 Figure 8: 32-Pin TQFP Drawing 73M2901CE Data Sheet 25 ...
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... Data Sheet 10 Ordering Information Table 4 lists the order numbers and packaging marks used to identify 73M2901CE products. Table 4: 73M2901CE Order Numbers and Packaging Marks Part Description 73M2901CE 32-Pin QFN Lead Free 73M2901CE 32-Pin QFN Lead Free Tape & Reel 73M2901CE 32-Pin Thin Quad Flat Pack Lead Free 73M2901CE 32-Pin Thin Quad Flat Pack Lead Free Tape & ...
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... In Section 6.1, duplicated the hardware design considerations from the 73M2901CE Demo Board User Manual. Moved the 73M2901CE/CL differences from the 73M2901CE Demo Board User Manual to Section 6.4. Replaced the schematics in Figure 3 and Figure 4 with new schematics. Improved the charts in Figure 5 and Figure 6. ...