Audio Click-Pop Suppressor

The MAX9890 provides click-and-pop suppression for devices such as CODECs with integrated headphone amplifiers that lack a clickless/popless startup/power-up or shutdown/power-down. The device controls the ramping of the DC bias voltage on the output-coupling capacitors and the application of the audio signal to ensure that no audible transients are present at the headphones. The MAX9890A features a 200ms startup time for use with up to 100µF coupling capacitors. The MAX9890B features a 330ms startup time for use with greater than 100µF coupling capacitors.

The MAX9890 consumes 14µA of supply current and 0.001µA in shutdown, while contributing less than 0.003% THD+N into a 32Ω load. ESD (Human Body Model) protection circuitry on the outputs protect the MAX9890 and devices further up the signal chain from ESD strikes up to ±8kV.

The MAX9890 is available in a miniature (1.5mm x 1.5mm x 0.6mm) 9-bump chip-scale package (UCSP™), as well as an 8-pin TDFN package (3mm x 3mm x 0.8mm), and is specified for operation over the -40°C to +85°C extended temperature range.

Applications

* Cell Phones * High-End Notebook Audio * PDAs * Portable DVD Players * Portable MP3 Players

* 36dB Click-Pop Suppression

* 2.7V to 5.5V Single-Supply Operation

* Clickless/Popless Startup/Power-Up and Shutdown/Power-Down

* 0.001µA Low-Power Shutdown Mode

* THD+N < 0.003% Into 32Ω

* ±8kV ESD Protected Outputs (Human Body Model)

* Requires Only One 0.1µF Capacitor to Complete the Circuit

* Low 14µA Supply Current

* Tiny Packaging

* 9-Bump UCSP (1.5mm x 1.5mm x 0.6mm)

* 8-Pin TDFN (3mm x 3mm x 0.8mm)