The MAX9860 is suitable for voice headsets, digital cameras, cell phones, portable recorders, VoIP telephones, and conference phones.
The MAX9860 has two differential microphone inputs with a user-programmable preamplifier and programmable gain amplifier. Automatic gain control with selectable attack/release times and a signal threshold allows maximum dynamic range. A noise gate with a selectable threshold helps quiet the audio channel when no signal is present. This configuration allows the user to select one channel for voice, while the other channel can be converted and processed downstream for echo-noise canceling and background noise.
The programmable digital voice filters offer full attenuation for out-of-band signals, as well as a 5th-order, GSM-compliant digital highpass filter. An elliptical digital filter notches the 217Hz (GSM) frequency for 8 kHz and 16 kHz sample rates. Also, an available digital side-tone mixer provides loopback of the ADC signal (microphones) to the digital-to- analog converter (DAC) output (headphone) in the case of a headset application.
The analog output is a bridge-tied-load (BTL), mono headphone amplifier. The MAX9860 can output 30mW into a 32O earpiece while operating from a single 1.8V power supply.
The MAX9860 includes two serial data interfaces. The ADC and DAC data is transferred over a flexible digital I²S-compatible interface that also supports TDM mode. General mode settings, including volume control, digital filters, and shutdown, are all programmed through a 2-wire, I²C-compatible interface.
The MAX9860 is available in a 4mm x 4mm, 24-pin TQFN package, and is fully specified over the -40°C to +85°C extended temperature range.
Maxim is a US-based manufacturer of linear and mixed-signal integrated circuits.
