The MAX9867 is an ultra-low power stereo audio codec designed for portable consumer devices such as mobile phones and portable gaming consoles. The device features stereo differential microphone inputs that can be connected to either analog or digital microphones. The single-ended line inputs, with configurable preamplifier, can be sent to the ADC for record or routed directly to the headphone amplifier for playback. An auxiliary ADC path can be used to track any DC voltage. The stereo headphone amplifiers support differential, single-ended, and capacitorless output configurations. Using the capacitorless output configuration, the device can output 10mW into 32Ω headphones. Comprehensive click-and-pop circuitry suppresses audible clicks and pops during volume changes and startup or shutdown. Utilizing Maxim’s proprietary digital circuitry, the device can accept any available 10MHz to 60MHz system clock. This architecture eliminates the need for an external PLL and multiple crystal oscillators. The stereo ADC and DAC paths provide user-configurable voice-band or audioband digital filters. Voiceband filters provide extra attenuation at the GSM packet frequency and greater than 70dB stopband attenuation at fS/2. The MAX9867 operates from a single 1.8V supply, and supports a 1.65V to 3.6V logic level. An I2C 2-wire seri- al interface provides control for volume levels, signal mixing, and general operating modes. The MAX9867 is available in a tiny 2.2mm 24-lead QFN package, suitable for applications with the most minimal space constraints.
The MAX9867 is an ultra‑low‑power stereo audio codec designed for portable consumer devices such as mobile phones, gaming consoles, and wireless headsets. It supports stereo differential microphone inputs, configurable line inputs, and headphone amplifiers with differential, single‑ended, or capacitorless output configurations.
The device operates from a single 1.8 V supply, accepts any master clock between 10 MHz and 60 MHz, and is offered in a 30‑bump 2.2 mm × 2.7 mm WLP package or a 32‑pin 5 mm × 5 mm TQFN‑EP package. Detailed electrical characteristics, absolute maximum ratings, and package information are provided.
| Supply Voltage Range | 1.65 V – 1.95 V |
|---|---|
| I/O Supply Voltage Range | 1.65 V – 3.6 V |
| Playback Power Consumption | 6.7 mW |
| Stereo DAC Dynamic Range | 90 dB |
| Stereo ADC Dynamic Range | 85 dB |
| Supported Master Clock | 10 MHz – 60 MHz |
| Package Options | 30‑bump 2.2 mm × 2.7 mm WLP; 32‑pin 5 mm × 5 mm TQFN‑EP |
| Operating Temperature Range | -40 °C to +85 °C |
The MAX9867 operates from a supply voltage of 1.65 V to 1.95 V.
The codec accepts any master clock between 10 MHz and 60 MHz.
It is offered in a 30‑bump 2.2 mm × 2.7 mm WLP package and a 32‑pin 5 mm × 5 mm TQFN‑EP package.