PCA1070

INTEGRATED CIRCUITS DATA SHEET PCA1070 Multistandard programmable analog CMOS transmission IC Product specification Supersedes data of 1996 Mar 06 File under Integrated Circuits, IC03 1997 Jun 20 Philips Semiconductors Product specification Multistandard programmable analog CMOS transmission IC FEATURES Line interface with: – Voltage regulator with programmable DC voltage drop – Programmable set impedance – Output to control an external switching MOS transistor for pulse dialling – Programmable DC voltage during pulse dialling – Circuitry for short DC settling time Interface to peripheral circuits with: – Supply for microcontroller and DTMF diallers – Input to sense supply voltage of microcontroller and output for reset of microcontroller – I2C-bus (programming of parameters, control of all logic signals) – High impedance DTMF signal input – Input for external oscillator signal with on-chip DC blocking – Power-down via the I2C-bus – Stabilized supply for electret microphone Microphone and DTMF amplifiers: – Low-noise microphone preamplifier suitable for various types of microphones – Symmetrical high impedance microphone preamplifier inputs – Programmable gain for microphone and DTMF channels – Sending mute via the I2C-bus to disable microphone amplifier and enable DTMF amplifier – Sending mute also to be used as privacy switch – Dynamic limiting (speech controlled) to prevent distortion of line signal and sidetone; programmable maximum sending level Receiving ampl...