CS4298 datasheet(47/52 Pages) CIRRUS

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CS4298

DS315PP2

FLTI - 3D Filter Input

A 1000 pF capacitor must be attached between this pin and FLTO if the 3D function is used.

FLTO - 3D Filter Output

A 1000 pF capacitor must be attached between this pin and FLTI if the 3D function is used.

FLT3D - 3D Filter

A 0.01

µF capacitor must be attached from this pin to AGND if the 3D function is used.

8.4

Modem/Telephony

MRX+, MRX- - Modem Line Differential Receive, Inputs

This differential input receive pair connects to a 2- to 4-wire hybrid converter or an integrated

DAA and is used to sample the analog phone line signal. The maximum full scale differential

input is 3.0 Vp-p. These pins may be used in single ended fashion by connecting the input to

MRX+ and AC-grounding the MRX- pin, or by tying one of the two inputs to Vrefout to

provide DC-biasing.

HRX+, HRX- - Handset Differential Receive, Inputs

This differential input receive pair connects to a 2- to 4-wire hybrid converter and is used to

communicate with the local handset. These input pins may also be used to interface to a second

telephone line. The maximum full scale differential input is 3.0 Vp-p. These pins may be used

in single ended fashion by connecting the input to HRX+ and AC-grounding the HRX- pin, or

by tying one of the two inputs to Vrefout to provide DC-biasing.

MTX+, MTX- - Modem Line Differential Transmit, Outputs

This differential transmit output pair connects the a 2- to 4-wire hybrid converter or an

integrated DAA and is used to transmit over the analog phone line. The maximum full scale

differential output is 5.6 Vp-p (MTX+ to MTX-). Each output pin is internally biased at the

Vrefout voltage. These pins may be used in single ended fashion by using one leg of the

differential output pair. The maximum output for each pin is 2.8 Vp-p or 1.0 Vrms.

HTX+, HTX- - Handset Differential Transmit, Outputs

This differential transmit output pair connects the a 2- to 4-wire hybrid converter or an

integrated DAA and is used to transmit over the analog phone line. The maximum full scale

differential output is 5.6 Vp-p (HTX+ to HTX-). Each output pin is internally biased at the

Vrefout voltage. These pins may be used in single ended fashion by using one leg of the

differential output pair. The maximum output for each pin is 2.8 Vp-p or 1.0 Vrms.

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