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MTC20154 Datasheet(PDF) 1 Page - STMicroelectronics |
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MTC20154 Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 21 page  1/21 MTC20154 February 2004 Features ■ Fully integrated AFE for ADSL ■ Overall 12 bit resolution, 1.1MHz signal bandwidth ■ 8.8 MS/s ADC ■ 8.8 MS/s DAC ■ THD: -60 dB @ full scale ■ 1V full scale input ■ Differential analog I/O ■ Accurate continuous-time channel filtering ■ 3 rd & 4th order tunable continuous time LP Filters ■ 64 pin TQFP package ■ 350mW power consumption Applications ■ ADSL Front-end for all full rate and Lite standards DESCRIPTION The MTC20154 is the fifth generation Analog Front End (AFE) designed for DMT based ADSL (Asynchronous Digital Subscriber Line) modems compliant with ANSI T1.413 category 2 standard. It includes one 12 bit DAC and one 13 bit ADC.It is intended to be used with the MTC20156/ MTC20147 DMT/ATM processors as part of the MTK20150/MTK20141 chipsets, but may also be used to support other xDSL signal processors. The MTC20154 provides programmable low pass filters for each of the two channels and automatic gain control. A configuration pin allows the filters to be switched from ATU-R mode to ATU-C mode. The pipeline ADC architecture provides 13 bit dy- namic range and a signal bandwith of 1.1 MHz. The device consumes only 0.35 Watt in full opera- tion and has a power down mode for standby. It is housed in a compact 64 pin thin plastic quad flat package. TQFP64 (10 x 10 1.4mm) ORDERING NUMBER: MTC10154TQ-C (Temp.: 0 to 70°C) INTEGRATED ADSL CMOS ANALOG FRONT-END CIRCUIT Figure 1. Block Diagram Tuning circuit I/V - Ref Xtal-driver VCXO DAC ICCQ Calibration CTRL/TST ifce G= -9..6dB 1dB step TXP TXN RXP RXN AACrx AGCrx AGCtx A = -15..0dB, 5dB step G = -0..31dB, 1dB step 12bits 13bits 4bits 4bits MUX MUX 1.1MHz HC/DS 138KHz SC/US ADC DAC |
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