TEA1111A is a speech circuit with dialler interface, regulated supply and earpiece volume control
The Philips TEA1111A is a bipolar integrated circuit designed to perform all speech and line interface functions required in fully electronic telephone sets. It handles electronic switching between speech and dialling modes while operating at low DC line voltages down to 1.5 V.
Key features include an internal current consumption of approximately 1.4 mA, a regulated supply voltage (Vpp) of 3.25 V for peripherals such as LCD modules and microcontrollers, and adjustable gain for both microphone and earpiece amplifiers. The device also provides AGC line loss compensation and LED control output for on-hook/off-hook status indication.
| Line voltage operating range (normal) | 3.7 - 4.3 V |
|---|---|
| Regulated supply voltage (Vpp) | 2.95 - 3.6 V |
| Typical microphone amplifier gain | 43.2 - 45.2 dB |
| Typical earpiece amplifier gain | 26.4 - 28.4 dB |
| Volume control range (earpiece) | -14.5 dB |
It is used in line powered telephone sets with LCD modules, cordless telephones, fax machines, and answering machines.
The IC operates at a line voltage down to 1.5 V DC, though performance may be reduced in this low voltage area.
The voltage at pin REG can be increased by connecting a resistor between pins REG and SLPE or decreased by connecting it between pins REG and LN.