AS1706

Overview

The AS1706 is a 1.6W bridged audio power amplifier from the AS1701/AS1706 series, designed for single-supply operation between 2.7V and 5.5V. It delivers 1.6W into a 4Ω load at 1% THD+N with 5V supply, or 0.8W into 8Ω. The device features greater than 65dB PSRR at 217Hz, integrated click-and-pop suppression, and low-power shutdown mode consuming 10nA. It includes over-temperature and over-current protection, operates within -40°C to +85°C, and is housed in an 8-pin MSOP package.

Feature Summary

• Bridge-tied load (BTL) architecture eliminates external output coupling capacitors
• Integrated digital input enables automatic low-power shutdown mode
• Built-in circuitry suppresses audible clicks and pops during power transitions
• Protective mechanisms include thermal overload and short-circuit current limiting

Applications

• Audio front-ends for battery-powered MP3 and CD players
• Mobile phones and PDAs
• Portable DVD players
• Hand-held battery-powered devices

Procurement Notes

Verify the SHDN pin configuration matches your system logic: connect SHDN to VDD for active-low shutdown control specific to the AS1706 model. Confirm the required delivery format (Tube vs. Tape and Reel) aligns with your assembly equipment capabilities. Ensure the operating voltage range of 2.7V to 5.5V is compatible with your power supply design.

Selection Notes

Select the AS1706 when an active-low shutdown signal is required, as opposed to the AS1701 which uses active-high control. This component is suitable for applications needing high power efficiency and minimal external components. Consider the 8-pin MSOP package constraints for thermal management if continuous high-power operation near 1.6W is expected.

Part Context

The AS1706 belongs to the AS1701/AS1706 family of 1.6W audio power amplifiers manufactured by austriamicrosystems AG (now ams-OSRAM). These devices utilize a bridge-tied load configuration to maximize output power from a single supply rail while maintaining high total harmonic distortion performance.

Replacement Considerations

The AS1701 is the primary alternative within the same datasheet, differing only in shutdown logic polarity (Active-High vs. Active-Low). Verify that the system's shutdown control signal polarity matches the replacement part's requirement before substitution.

FAQ

How does the AS1706 differ from the AS1701?

The AS1706 features an active-low shutdown control, requiring the SHDN pin to be connected to VDD to enter shutdown mode. The AS1701 uses active-high shutdown, requiring connection to GND.

What is the purpose of the BIAS pin?

The BIAS pin provides a DC bias bypass connection. It is internally connected to the non-inverting input of one amplifier and should be connected to the non-inverting input of the other amplifier for proper signal biasing and click/pop suppression.