Audio Signal Processing
Audio Power Amplifiers
The following are the new power amplifiers specifically designed to meet the requirements of flat and rear-projection TVs for lower profile and higher output power.
- Class-D 20-W ×2-Channel (BTL) Low-Frequency Power Amplifier: TB2924AFG
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- Pout = 7.5 W×2 ch (RL = 8 Ω), or 13 W×2 ch (RL = 4 Ω)@VCC = 12 V
- Pout = 10.5 W×2 ch (RL = 8 Ω), or 19.5 W×2 ch (RL = 4 Ω)@VCC = 15 V
- Efficiency: 88%, Thermal automatic gain control (AGC) prevents output clipping.
Multi-channel master/slave configuration - Characteristic supply voltage ranges: 11 to 18 V(Topr = 0 to 75゜C, RL = 4 Ω)
11 to 20 V(Topr = 0 to 75゜C, RL = 8 Ω) - data sheet: TB2924AFG
- Class-AB MOS-Output 20-W ×2-Channel (BTL) Low-Frequency Power Amplifier: TB2922HQ
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- Pout = 20 W×2 ch(RL = 8 Ω), Pout = 35 W×2 ch(RL = 4 Ω)@VCC = 18 V
- Max Power = 72 W×2 ch(RL = 8 Ω)@VCC = 26 V
- THD = 0.02％(Typ.)
- Standby mode, audio muting, load shorting protection, short-to-supply protection, short-to-ground protection, overvoltage protection, thermal shutdown
- Operating supply voltage ranges: 9 to 26 V(RL = 8 Ω / 6 Ω)
9 to 18 V(RL = 4 Ω) - data sheet: TB2922HQ
Bipolar Transistors for Audio Output
| Package Characteristics |
TO-92MOD | TO-126 |
|---|---|---|
| VCEO = 150 V, IC = 1.5 A | - | 2SC3621 |
| 2SA1408 | ||
| VCEO = 160 V, IC = 0.1 to 0.2 A | 2SC2230×2 | 2SC3963×2 |
| VCEO = 180 V, IC = 0.1 to 0.2 A | 2SC2230A×2 | - |
Digital Audio Optical Modules
TOTX147, TXTX177, TORX147 and TORX177 Audio TOSLINK Series
The TOTX147 and TOTX177 Series are designed for transmitting audio signals, and the TORX147 and TORX177 Series are designed for receiving audio signals. These TOSLINK optical modules are manufactured at Toshiba Semiconductor Thailand (TST). The TOTX147 and TORX147 Series have a supply voltage of 3.3 V, while the TOTX177 and TORX177 Series have a supply voltage of 5 V. All of them offer a data rate of up to 15 Mb/s. All these series are available in three package versions: standard panel-mount, standard panel-mount with shutter, and mini with shutter.