TEA1068

INTEGRATED CIRCUITS DATA SHEET TEA1068 Versatile telephone transmission circuit with dialler interface Product specification Supersedes data of June 1990 File under Integrated Circuits, IC03 1996 Apr 23 Philips Semiconductors Product specification Versatile telephone transmission circuit with dialler interface FEATURES Voltage regulator with adjustable static resistance Provides supply for external circuitry Symmetrical high-impedance inputs (64 kΩ) for dynamic, magnetic or piezoelectric microphones Asymmetrical high-impedance input (32 kΩ) for electret microphone Dual-Tone Multi-Frequency (DTMF) signal input with confidence tone Mute input for pulse or DTMF dialling Power down input for pulse dial or register recall Receiving amplifier for magnetic, dynamic or piezoelectric earpieces QUICK REFERENCE DATA SYMBOL VLN Iline line voltage line current TEA1068 TEA1068T ICC VCC internal supply current supply voltage for peripherals normal operation normal operation power down; input LOW power down; input HIGH Iline = 15 mA; MUTE = HIGH Ip = 1.2 mA Ip = 1.7 mA Gv voltage gain microphone amplifier receiving amplifier ∆Gv Vexch Rexch Tamb line loss compensation gain control range exchange supply voltage exchange feeding bridge resistance range ambient operating temperature 44 17 5.5 24 0.4 −25 − − 5.9 − − 2.8 2.5 3.05 − 10 10 − − − − 0.96 55 PARAMETER CONDITIONS Iline = 15 mA MIN. 4.2 TYP. 4.45 TEA1068 Large gain setting range on microphone and earpiece amplifie...