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BU8242F

Rohm
Part Number BU8242F
Manufacturer Rohm
Description Cross point mixer
Published Apr 17, 2005
Detailed Description Communication ICs Cross point mixer for telephones BU8241F / BU8241FS / BU8242F / BU8244F The BU8241F, BU8241FS, BU8242...
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BU8242F
BU8242F

Overview
Communication ICs Cross point mixer for telephones BU8241F / BU8241FS / BU8242F / BU8244F The BU8241F, BU8241FS, BU8242F, and BU8244F are ICs developed for use with cordless telephones, and are equipped with switching and mixing functions.
In addition, these ICs are provided with an internal power save function which enables the circuit to be run on line current if the power supply fails, by connecting a switch between the circuit and a new handset, reducing line current consumption.
A series of these ICs is also under development, based on the number of circuits.
FApplications Telephones, telephone answering machines, cordless telephones FFeatures 1) Eight input signals are selected and mixed by a cross-point, and output to eight pins (BU8241F / BU8241FS).
2) A power save mode enables the circuit to run on line current if the power supply fails.
1.
Line current consumption reduced (IDD2 = 580µA) 2.
IN1 ! OUT1 and IN2 ! OUT2 only are on 3) Serial binary data input.
4) Low voltage and current consumption.
266 Communication ICs FBlock diagram BU8241F / BU8241FS / BU8242F / BU8244F 267 Communication ICs BU8241F / BU8241FS / BU8242F / BU8244F FAbsolute maximum ratings (Ta = 25_C) FRecommended operating range (Ta = 25_C) 268 Communication ICs BU8241F / BU8241FS / BU8242F / BU8244F FElectrical characteristics (unless otherwise noted, Ta = 25_C, VDD = 5V) 269 Communication ICs FPin descriptions BU8241F / BU8241FS / BU8242F / BU8244F FInput / output circuits 270 Communication ICs BU8241F / BU8241FS / BU8242F / BU8244F FCircuit operation Sections (1) to (3) below describe operation using the BU8241F and BU8241FS as examples.
(1) Analog signals pass through an input amplifier and are supplied to eight switches.
The analog input signals are turned on and off by the switches and can thus be directed to any desired output amplifier.
Using mixing resistors connected to the outputs of the switches, and feedback resistors, each output amplifier can output a ...


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