TEA1062 Low-Voltage Telephone Transmission Circuit DIP-16 (TEA1062 IC)
The TEA1062 is a high-performance integrated circuit designed specifically for telephone transmission and speech functions. Housed in a 16-pin DIP package, it is a versatile solution that performs all the line interface and speech tasks required for modern electronic telephone sets. It is widely regarded for its ability to operate at very low line voltages (down to 1.6V), making it ideal for systems with long subscriber lines or parallel-connected handsets.
In India, this IC is a staple for repairing corded telephones and designing specialized communication systems like intercoms and headsets. Unlike the TEA1060, the TEA1062 is optimized for high-impedance microphones (such as electrets), providing excellent noise immunity and audio clarity.
Key Features
- Low Voltage Operation: Maintains full functionality at line voltages as low as 1.6V, ensuring reliability in varying network conditions.
- Dialer Interface: Provides a stable, regulated supply voltage to power external pulse or DTMF dialer ICs directly from the line.
- Automatic Gain Control (AGC): Features built-in line-loss compensation, which automatically adjusts microphone and earpiece gain based on the line current.
- Mute Function: Includes a dedicated Mute input to inhibit speech signals during dialing or when privacy is required.
- Side-Tone Circuit: Integrated circuitry allows the user to hear a controlled "confidence tone" of their own voice in the earpiece.
- Symmetrical Inputs: Tuned for electret microphones, offering superior noise rejection and simplified external component requirements.
Specifications
- IC Type: Telephone Transmission / Speech Circuit
- Operating Line Current: 1 mA to 140 mA
- Microphone Gain: 44 dB (Typical, adjustable)
- Earpiece Gain: 20 dB (Typical, adjustable)
- Supply Voltage (VCC): 2.4V to 3.8V
- Package Type: PDIP-16 (Through-Hole)
- Operating Temperature: -25°C to +75°C
Pinout Configuration (16-Pin DIP)
- Pin 1 (LN): Positive Line Terminal
- Pin 2 (GAS1): Transmitting Gain Adjustment 1
- Pin 3 (GAS2): Transmitting Gain Adjustment 2
- Pin 4 (QR): Receiver Output
- Pin 5 (GAR): Receiving Gain Adjustment
- Pin 6 (MIC-): Inverting Microphone Input
- Pin 7 (MIC+): Non-Inverting Microphone Input
- Pin 8 (STAB): Current Stabilizer Connection
- Pin 9 (VEE): Negative Supply (Line Return)
- Pin 10 (IR): Receiving Amplifier Input
- Pin 11 (DTMF): DTMF Signal Input
- Pin 12 (MUTE): Mute Control Input
- Pin 13 (VCC): Regulated Supply Output (for Dialer)
- Pin 14 (REG): Voltage Regulator Decoupling
- Pin 15 (AGC): Automatic Gain Control
- Pin 16 (SLPE): DC Resistance (Slope) Adjustment
