SC11000

The SC11000 modem  filter is monolithic CMOS switched-capacitor filter circuits designed for use in full duplex 1200 and 2400 bit per second modems.They meet the requirements of the Bell 212A,  CCITT V.22 and V.22bis specifications and include high-band (2400 Hz) and low-band (1200 Hz) filters, half-channel compromise amplitude and group delay equalizers and smoothing filters forbothbands. ForCCITTV.22and V.22bis applications, a notch filter is included that can be programmed for either 550 Hz or 1800 Hz. Also included in the filters are two uncommitted operational amplifiers that can be used for antialiasing filters or for gain control.

The SC11000 has the following features include:(1)transmit and receive filters with half-channel compromise equalizers;(2)call progress mode answer/originate mode switching;(3)bell 272A, CCITT  V.22 and V.22bis compatible with V.22 notch filters;(4)analog loopback capability.The SC11000 is pin and function compatible to the AMI S35212 and the Reticon R5632.Like the S35212,the high-band filter in the SC11000 can be scaled down by a factor of 6 so that it can be used to monitor call progress tones in an intelligent modem.

The absolute maximum ratings of the SC11000 are:(1)lead temperature:300°C;(2)operating temperature range:-0 to +70°C;(3)maximum power disspation:500mW;(4)supply voltage:-7 to +7V;(5)storage temperature range:-65 to +150°C.Specifically, this arrangement is well suited for implementing an intelligent 212A or V.22 modem.The modem can be designed to be either stand-alone with RS-232 interface to DTE or integrated in a computer with a parallel bus interface. It is assumed that a controller is available that can control the various operating modes of the filter, monitor the output of the energy detector and ring indicator,and control the switch-hook relay in the Data Access Arrangement(DAA). This application illustrates how the modem filter can be used with minimum of external circuitry to implement a fully automatic call establishment procedure.

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