ams announced the AS3435 and AS3415 ANC speaker drivers. The devices will enable a new generation of noise cancellation stereo headsets with zero audible hiss. The AS3415 and AS3435 ANC speaker driver ICs are available for sampling now. The AS3435 feedback ANC IC is priced at $3.90 for 1,000 pieces. The AS3415 feed-forward ANC IC is priced at $3.50 for 1,000 pieces. The AS3435 is in a QFN36 package, and the AS3415 in a QFN32 package, both 5mm x 5mm.
ams AS3435 and AS3415 ANC Speaker Drivers Features
- Feed Forward, Feed Back and Hybrid
- Integrated depletion mode transistors
- Ultra flexible low power EQ circuit
- 10mW @1.5V stereo ANC; <1µA quiescent
- 2x24mW, 0.1% THD+N @ 32 Ω, 1.5V supply
- AS3415 QFN32 [5x5mm] 0.5mm pitch
- AS3435 QFN36 [5x5mm] 0.4mm pitch
- LED driver with selectable driving strength
- Push Button-, Slide switch- or I2C control interface
- OTP production trimming via audio interface
- Monitor mode function
According to ams, the AS3435 and AS3415 are the industry’s first ANC (active noise cancellation) ICs to feature integrated bypass switches. The devices feature ultra-low noise amplifiers with a 900nV input referred noise floor. They are the first ANC speaker drivers to produce no audible high-frequency hiss when paired with low-noise microphones.
The AS3435 and AS3415 feature integrated bypass switches so that the music signal coming from the 3.5mm audio jack may be routed through the ANC chipset without any power source connected to the device. By eliminating the external switch, this feature helps to reduce bill-of-materials cost and the size of the PCB, as well as relieving the designer of the need to accommodate a mechanical switch on the headset’s housing.
The devices’ analog implementation of noise cancellation provides for power consumption often two or three times lower than equivalent digital solutions. The AS3435 and AS3415 has typical power consumption of 10mW at 1.5V in noise cancellation mode, either device can support operation for more than 100 hours from a single AAA battery.