Description
   The MT35212A is an ISO2-CMOS integrated circuit designed to implement both the filtering and equalizing functions required in Bell 212A and CCITT V.22 modems. The MT35212A includes both the transmit signal shaping filter and the receive signal separation filter and features on-chip originate/answer mode selection. In addition, half- channel compromise amplitude and group delay equalizers are included. Provision is made for the receive smoothing filter to switch between the Call Progress mode and the normal data transmission mode.

FEATUREs
• Bell 212A and CCITT V.22 compatible
• Usable for Bell 103 and V.22 Bis Applications
• Guard tone notch filters for V.22 Applications
• High and low bandfilters with compromise group delay equalizers and smoothing filters
• Answer/originate operating modes
• Detection of call progress tones
• Choice of clocking frequencies: 2.4576 MHz, 1.2288 MHz, or 153.6 kHz
• Analog loopback test capability
• Two uncommitted operational amplifiers
• Pin compatible with AMI S35212A

APPLICATIONs
• Modem filter/equalizer for 1200 bps full duplex modem implementation
• Detection of tones in the call progress band by selecting filters