PCA1070 |
RFQ for PCA1070 Required Field |
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| Product | Manufacturers | Pack | D/C |
| PCA1070 | - | SOP | N/A |
The PCA1070 is a CMOS integrated circuit performing all speech and line interface functions in fully electronic telephone sets. The device requires a minimum of external components. The transmission parameters are programmable via the I2C-bus. This makes the IC adaptable to nearly all worldwide country requirements and to a various range of speech transducers, without changing the (few) external components.
The parameters are stored in the EEPROM of a microcontroller and are loaded into the PCA1070 during the start-up phase of the transmission IC after hook-off. The PCA1070 also allows adaptation to the connected telephone line by reading the line current via the I2C-bus and processing it in the microcontroller.
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 amplifier: Suitable for various types of earpieces (includingpiezo) Programmable gain and hearing protection level Receiving mute via the I2C-bus to disable receiving amplifier and enable DTMF confidence tone On-chip anti-sidetone circuit with programmable sidetone balance Confidence tone in the earpiece during DTMF dialling` Facility to regulate parameters with line current: Value of DC line current (bit code) readable via the I2C-bus Line loss compensation with fully software programmable characteristics (control range, stop current) of microphone/earpiece/DTMF amplifiers Fully software programmable control of sidetone balance and DC voltage |
