Mono Audio Codec eliminates need for external PLL and XOs.
Press Release Summary:
Supplied in 4 x 4 mm package, MAX9860 features dual ADC paths and programmable digital voice filters. Flexible clocking scheme utilizes common system-clock frequencies from 10-60 MHz, and IC offers 2 differential microphone inputs with user-programmable preamplifier and programmable gain amplifier. Configuration lets user select one channel for voice, while other channel can be converted and processed downstream for echo-noise canceling and background noise.
Original Press Release:
Low-Power, Programmable Digital Voice Filters and a Flexible Clocking Scheme that Eliminates PLLs and Crystal Oscillators
Programmable audio codec eliminates the need for external components.
SUNNYVALE, CA-May 12, 2009-Maxim Integrated Products (NASDAQ: MXIM) introduces the MAX9860, a low-power, mono audio codec with dual ADC paths and programmable digital voice filters. The device employs a flexible clocking scheme that utilizes common system-clock frequencies ranging from 10MHz to 60MHz, thereby eliminating the need for an external PLL and multiple crystal oscillators. The MAX9860 is ideal for voice headsets, digital cameras, cell phones, portable recorders, VoIP telephones, and conference phones.
The MAX9860 includes 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 provide 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 8kHz and 16kHz sample rates. Also, an available digital side-tone mixer provides loopback of the ADC signal (microphones) to the 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 32Ã(TM) earpiece while operating from a single 1.8V power supply. This low-voltage operation translates into low power consumption that makes the MAX9860 the ideal choice for battery-powered applications.
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. Pricing starts at $0.93 (10,000-up, FOB USA).
Maxim Integrated Products is a publicly traded company that designs, manufactures, and sells high-performance semiconductor products. The Company reported revenue in excess of $2 billion for fiscal 2008. Maxim was founded over 25 years ago with the mission to deliver innovative analog and mixed-signal engineering solutions that add value to its customers' products. To date, it has developed over 5900 products serving the industrial, communications, consumer, and computing markets. For more information, go to www.maxim-ic.com.
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