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TI debuts multichannel high-performance audio ADCs

12 Mar 2015

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Texas Instruments (TI) has announced a line-up of high-performance audio analogue-to-digital converters (ADCs). The devices in the PCM1865 family support dynamic range as high as 110dB and integrate features typically found in portable audio codecs, while also affording a level of performance previously found only in single-function, professional audio ADCs, stated the company.

Powered by a single 3.3V supply, the PCM1865 audio ADC removes the traditional requirement for a dedicated analogue 5V rail, making smaller, more efficient products possible. Each device in the family claims to solve many system-level design headaches, including hum and ground noise, input-signal level sensitivity and attenuation, all with a single device. This integration is particularly beneficial for end equipment such as PCs; sound bars; audio docks; Bluetooth speakers; video-security systems; and automotive infotainment equipment including after-market head units, amplifiers and active noise-cancellation systems.


According to the company, the PCM1865 family consists of six pin-to-pin compatible devices offering two- and four-channel options, with software- and hardware-controlled variants. Three of the six devices in the PCM1865 family can achieve up to 110dB performance. No other audio ADCs on the market can achieve a performance level of 110dB with a single 3.3V power supply, boasted the company.

With direct, high-voltage 2.1VRMS support, the devices optimise audio quality and allow for a higher SNR. Additionally, the software-controlled devices' automatic clipping-suppression feature helps designers optimise input sensitivity for maximum SNR, TI indicated.

The audio ADCs claim to deliver the same performance as competing solutions while potentially eliminating as many as 20 components. The devices integrate a clock-generating phase-locked loop (PLL), programmable gain amplifier and universal front end, which supports various inputs from low-level microphones to 4.2VRMS differential inputs. Designers can easily configure single-ended and differential inputs to cancel hum and ground noise.

In addition, the integration of TI's patent-pending Energysense technology helps designers meet operating requirements set by the European Union's (EU) Ecodesign Directive. By using the on-chip secondary ADC, designers can easily set both sleep and wake-up thresholds, which can help equipment achieve the energy efficiency levels required in this EU directive. Available in 7.8mm x 4.4mm 30-pin TSSOP packages, the devices are up to 45 per cent smaller than competing devices, added the company. Pricing for the devices ranges from $1.40 to $3.99 in 1,000-unit quantities.

Designers can start developing with the PCM1865 family through easy-to-use evaluation modules (EVMs) including the PCM1865EVM, which can be purchased in the TI store for $149.

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