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 ✕ 1.5mm ✕ 0.6mm) 9-bump chip-scale package (UCSP™), as well as an 8-pin TDFN package (3mm ✕ 3mm ✕ 0.8mm), and is specified for operation over the -40°C to +85°C extended temperature range.
The MAX9890 is an audio click‑pop suppressor designed for single‑supply devices such as CODECs and headphone amplifiers that lack built‑in transient suppression. It controls the ramp‑up of the DC bias on output‑coupling capacitors and the audio signal to eliminate audible transients during power‑up and power‑down.
The device is offered in a 9‑bump UCSP package (1.5 mm × 1.5 mm × 0.6 mm) and an 8‑pin TDFN package (3 mm × 3 mm × 0.8 mm), operates from 2.7 V to 5.5 V, and provides up to +8 kV ESD protection on its outputs. Detailed electrical characteristics, pin descriptions, and typical operating curves are included.
| Supply Voltage Range | 2.7 V to 5.5 V |
|---|---|
| Supply Current (active) | 14 µA |
| Shutdown Supply Current | 0.001 µA |
| THD+N | < 0.003 % into 32 Ω load |
| ESD Protection (outputs) | +8 kV Human Body Model |
| Startup Time (MAX9890A) | 200 ms |
| Startup Time (MAX9890B) | 330 ms |
| Operating Temperature Range | -40 °C to +85 °C |
| On‑Resistance (RON) at 5.5 V | 0.4 Ω |
| Output Discharge Resistance | 220 kΩ |
| Bandwidth | > 100 kHz |
The device operates from 2.7 V to 5.5 V.
The outputs are protected up to +8 kV under the Human Body Model.