Overview
The MC34119DTB is a low power audio amplifier integrated circuit primarily designed for telephone applications, such as in speakerphones. It is manufactured by Freescale Semiconductor and is available in a TSSOP package. This amplifier is notable for its wide operating supply voltage range, low quiescent supply current, and the ability to drive a variety of speaker loads.
Key Specifications
| Characteristics | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply Voltage | VCC | 2.0 | 16 | Vdc | |
| Maximum Output Current at V01, V02 | ±250 | mA | |||
| Open Loop Gain (Amplifier #1, f<100Hz) | AVOL1 | 80 | dB | ||
| Closed Loop Gain (Amplifier #2, VCC=6.0V, f=1.0kHz, RL=32Ω) | AV2 | -0.35 | 0... +0.35 | dB | |
| Gain Bandwidth Product | GBW | 1.5 | MHz | ||
| Total Harmonic Distortion (f=1.0kHz) | THD | 0.5 | 1.0 | % | |
| Power Supply Current (VCC=3.0V, RL=∞, CD=0V) | ICC | 2.7 | 5.0 | mA | |
| Power-Down Quiescent Current | ICCD | 65 | 100 | µA | |
| Junction Temperature | -55 | +140 | ℃ |
Key Features
- Wide Operating Supply Voltage Range (2.0 V to 16 V), allowing for telephone line powered applications.
- Low Quiescent Supply Current (2.7 mA Typ) suitable for battery-powered applications.
- Chip Disable Input to power down the IC or mute the input signal.
- Low Power-Down Quiescent Current (65 µA Typ).
- Drives a wide range of speaker loads (8.0 Ω and up).
- Output Power exceeds 250 mW with a 32 Ω speaker.
- Low Total Harmonic Distortion (0.5% Typ).
- Gain adjustable from <0 dB to >46 dB for voice band.
- Requires few external components.
Applications
The MC34119DTB is primarily used in telephone applications, such as speakerphones. Its low power consumption and wide operating supply voltage range make it suitable for both line-powered and battery-powered devices. It is also applicable in other low-power audio amplification needs where differential output and adjustable gain are required.
Q & A
- What is the minimum supply voltage for the MC34119DTB?
The minimum supply voltage is 2.0 V.
- What is the typical quiescent supply current of the MC34119DTB?
The typical quiescent supply current is 2.7 mA.
- How does the Chip Disable pin function?
The Chip Disable pin allows the IC to be powered down or muted. A logic '0' (<0.8 V) sets normal operation, while a logic '1' (≥2.0 V) sets the power down mode.
- What is the maximum output power of the MC34119DTB with a 32 Ω speaker?
The output power exceeds 250 mW with a 32 Ω speaker.
- What is the typical total harmonic distortion of the MC34119DTB?
The typical total harmonic distortion is 0.5%.
- What is the gain adjustment range for the MC34119DTB?
The gain is adjustable from <0 dB to >46 dB for voice band.
- What types of packages are available for the MC34119?
The MC34119 is available in standard 8-pin DIP, SOIC, and TSSOP packages.
- What is the maximum junction temperature for the MC34119DTB?
The maximum junction temperature is +140 ℃.
- How does the power supply rejection feature work?
A capacitor at pins FC1 and FC2 can increase power supply rejection and affect turn-on time.
- What is the recommended load impedance for the MC34119DTB?
The recommended load impedance is 8.0 Ω and up.
