CM8870PI DATASHEET PDF

The filter section uses a switched capacitor technique for both high and low group filters and dial tone rejection. This DTMF receiver minimizes external component count by providing an on-chip differential input ampli- fier, clock generator, and a latched three-state interface bus. The on-chip clock generator requires only a low cost TV crystal or ceramic resonator as an external component. All rights reserved.

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It offers a large amount of data sheet, You can free PDF files download. The updated every day, always provide the best quality and speed. Product Description. This DTMF receiver minimizes external component count by providing an on-chip differential input ampli-. The on-chip clock generator requires only a low cost TV. All rights reserved. Tel: Fax: Functional Description. Filter Section. Separation of the low-group and high-group tones is achieved.

The bandwidths of these. The filter section also. Each filter output is followed by a. Signal limiting is performed by high-. These comparators are provided with a. The outputs of the comparators provide full-rail. Decoder Section. A complex averaging algorithm is used to protect against tone. When the detector recognizes the simultaneous presence of. Any subsequent loss of signal. Steering Circuit. Before the registration of a decoded tone pair, the receiver. This check is performed by an.

A logic high on ESt. Providing signal condition is maintained ESt remains high for. GT continues to drive high as long as ESt remains high,. The steering circuit works in reverse to validate the. Thus, as well as rejecting. This capability together with the.

Guard Time Adjustment. In situations which do not require independent selection of. Component values are chosen according to the. For example, a. A typical circuit using this steering configuration is shown in. Figure 1. The timing requirements for most telecommunica-. This may be necessary to meet system specifications which. Guard time adjustment also allows the designer to tailor. Increasing t REC improves talk-off performance, since it reduces. On the.

Design information for guard time adjustment is shown. Input Configuration. V REF which is used to bias the inputs at mid-rail. Provision is made for connection of a feedback resistor to the. In a single-ended configuration, the input pins are connected. Figure 6 shows the. Clock Circuit. The internal clock circuit is completed with the addition of a. OSC3 that can be used to drive clock inputs of other devices. Figure 7.

The filter section uses a switched capacitor technique for both high and low group filters and dial tone rejection. This DTMF receiver minimizes external component count by providing an on-chip differential input ampli- fier, clock generator, and a latched three-state interface bus. The on-chip clock generator requires only a low cost TV crystal or ceramic resonator as an external component. PDF Datasheet ].

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