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PC1601LRS-AEA-B PC1601LRS-AEA-B PC1601LRSAEAB Datasheet

Functional Description With no key inputs to the device the oscillator is inhibited, the output transistor is pulled OFF and device current con- sumption is reduced to a minimum. Key closures are sensed statically. Any key closure activates the MUTE output, starts the oscillator and sets the high group and low group pro- grammable counters to the appropriate divide ratio. These counters sequence two ratioed-capacitor D/A converters through a series of 28 equal duration steps per sine-wave cycle. The two tones are summed by a mixer amplifier, with pre-emphasis applied to the high group tone. The output is an NPN emitter-follower requiring the addition of an external load resistor to Vss. This resistor facilitates adjustment of the signal current flowing from VDD through the output tran- sistor.
PC1601LRS-AEA-B PC1601LRS-AEA-B PC1601LRSAEAB Price

previous internal status and data are memorized during loading ofthe input registerso thattransmcs- sion continues properly. That feature allows the user to modify transmission level or line monitoring selection during transmission. The transmit chan- nel operatingmode (Modem main or back channel, DTMF) can only be modified when RTS = 1. When RTS = 0, the ATO transmit output is enabled and the preselectedoperating mode is activated.When RTS returns t0 1, Modem or DTMF transmission is
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LTC1840 Device Address		2-Wire Bus Slave Address Bits (B7,B6,B5 = 111)
AO	Al	B4	B3	B2	Bl
L	NC	0	0	0	0
NC	H	0	0	0	1
NC	NC	0	0	1	0
H	NC	0	0	1	1
L	L	0	1	0	0
H	H	0	1	0	1
NC	L	0	1	1	0
H	L	O	1	1	1
L	H	1	0	0	0

Supply voltage range, VCC . . . .. . Input voltage range, VI (see Note l) . . . . . . Voltage range applied to any output in the high-impedance or power-off state, VO (see Note l) .. Output voltage range in the high or low state, VO (see Note l) . . . . Input clamp current, IIK (VI < 0) . . Output clamp current, lOK (VO < 0) ' '''''' Continuous output current, IO ' " ' Continuous current through VCC or GND . . Package thermal impedance, ejA (see Note 2): DBV package . . . . DCK package .... DRL package .... YEP/YZP package . . . . . . . . . . . . Storage temperature range, Tstg .

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