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73M2901CL Datasheet(PDF) 11 Page - TDK Electronics |
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73M2901CL Datasheet(HTML) 11 Page - TDK Electronics |
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11 / 18 page  73M2901CL V.22bis Single Chip Modem 11 MODEM PERFORMANCE CHARACTERISTICS The curves presented in this data sheet define modem IC performance under a variety of line conditions typical of those encountered over Public Switched Telephone Network. BER VS. SNR This test represents the ability of the modem to operate over noisy lines with a minimum amount of data transfer errors. Since some noise is generated in the best dial up lines, the modem must operate with the lowest signal to noise ratio (SNR) possible. Better modem performance is indicated by test curves that are closest to the BER axis. A narrow spread between curves representing the four line parameters indicates minimal variation in performance while operating over a range of typical operating conditions. A DPSK modem will exhibit better BER performance test curves receiving in the low band (answer mode) than in the high band (originate mode). BER VS. RECEIVE LEVEL This test measures the dynamic range of the modem. Because signal levels vary widely over dial up lines, the widest possible dynamic range is desirable. The SNR is held constant at the indicated values as the Receive level is lowered from a very high to a very low signal level. The width of the bowl of these curves, taken at the BER break points is the measure of the dynamic range. RECOMMENDED SCHEMATIC ARRANGEMENT HOOKB RTSB RXA VCC3_3D RXDB VCC3_3A RXDB TXAP VBG R13 21K VCC3_3D + C9 22uF RST C10 0.1uF HOOKB J1 CON10 1 2 3 4 5 6 7 8 9 10 DSRB R23 NC R2 2K R28 120K R17 475 DTRB TXDB C3 33pF DTRB TXAN LIUCHECKB U2 LDA110* 1 2 4 6 5 + C1 10uF U4 TLP627 C14 0.1uF C11 0.1uF R16 100 + C12 10uF RIB ISOLATION BARRIER VCC3_3 RXA_TAP T1 671-8005 3 2 4 1 R20 22K U11P2 C4 .082UF TXAN VCC3_3D DCDB RINGB/PPUB/LIUB/LREVB CTSB VCC3_3D C7 0.1uF + C13 10uF VCC3_3A Y1 11.0592 MHz R1 10K C8 0.1uF C6 0.1uF U10P2 R15 5.1K VCC3_3D U3 TLP627 VCC3_3D RXA RIB DCDB U1 2901CL_TQFP32 29 30 31 32 28 27 26 9 10 11 12 13 14 15 16 25 USR20 RING RELAY RI DTR RXCLK RXD RESET VPA TXAN TXAP VREF VBG RXA VNA VPD RTSB C2 27pF R18 100 TXDB TXAP VCC3_3 TXDB T1P3 DSRB VREF + C5 10uF RST CTSB C20 0.1uF [js1] |
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