CS4298 Datasheet, PDF (47/52 Pages) Cirrus Logic – SoundFusion Audio/Modem Codec 97 (AMC 97)

CS4298
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.
DS315PP2
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