Inside

• 16-bit Analog Interface for DSP Solutions
• Integrated power supply and audio for wireless systems
• TI offers industry's first complete range of 1394 design kits
• Mixed-Signal & Analog CD-based designer's guide
• 400 PDPI linear image sensor with electronic shutter capability
• Optocoupler with feedback for analog signals
• Booming 1 W output with improved fidelity
• TL16PIR552 Dual UART with IrDA and IEEE 1284
• High-Speed Peripheral GeoPort™/AppleTalk™ Transceivers
• Single-Ended to Differential SCSI Converter Chipset
• Wireless and Telecommunications Data Book
• Opto-isolated feedback amplifier in "gull wing" package

Booming 1 W output with improved fidelity

Product Features

• Low Supply Current...3.5 mA Typ @ 5 V (0.6 µA shutdown)
• High DC Power Supply Rejection 75 dB @ 3.3 V
• 70 dB @ 5 VLow Voice Band THD+N @ 1 W ...0.4% Typ
• Specified and characterized at 3.3 V and 5 V
• Upgrade to MC34119, NJM2113, LM386, TDA7052
• Characterized for operation from –20°C to 85°C

The TPA486x family will deliver 1 W of continuous average power into an 8 load from a 5-V supply. The typical supply current, of only 3.5 mA at 5 V, is 50% lower than the nearest competitor which makes these devices an ideal upgrade for battery powered applications. Critical specs of PSRR and THD+N (Total Harmonic Distortion and Noise) have been improved over previous solutions. The AC power supply rejection (PSRR) is

56 dB at 1 kHz, which reduces audible noise in the amplified signal. The device operates with a mere 0.4% of THD+N @ 1 W in the voice band range, enhancing fidelity in cellular, PDA, and game applications. The amplifiers feature a shutdown function for power sensitive applications as well as internal thermal and short circuit protection. During shutdown mode, supply current is 0.6 µA. The TPA4860 also includes headphone interface logic circuitry to facilitate headphone applications.

By taking advantage of the Bridged Tied Load (BTL) configuration, the TPA486x eliminates the large output coupling capacitors and quadruples the available output power as compared to single-ended (SE) solutions such as the LM386 offers. Therefore, the total PCB space required is much smaller than SE configurations of the same output power.

The TPA4860 is available in a 16-pin SOIC package. The TPA4861 is available in an 8-pin SOIC package. Both devices are specified and fully characterized at 3.3 V and 5 V. Both devices are a drop in replacements for the National Semiconductor LM486x.

• TPA4860D
• TPA4861D