TI's new multichannel devices simplify audio front-end design while reducing standby power consumption
Texas Instruments (TI) introduced a family of six high-performance audio analog-to-digital converters (ADCs). Featuring a dynamic range as high as 110 dB, the devices in the PCM1865 family integrate features typically found in portable audio codecs, while also giving designers a level of performance previously found only in single-function, professional audio ADCs.
Powered by a single 3.3-V supply, the PCM1865 audio ADC removes the traditional requirement for a dedicated analog 5-V rail, making smaller, more efficient products possible. Each device in the new family solves 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 like personal computers; sound bars; audio docks; Bluetooth® speakers; video-security systems; and automotive infotainment equipment including after-market head units, amplifiers and active noise-cancellation systems.
Key benefits of the PCM1865 family:
- Design flexibility:
The PCM1865 family consists of six pin-to-pin compatible devices offering two- and four-channel options, with software- and hardware-controlled variants.
- High dynamic range:
Three of the six devices in the PCM1865 family can achieve up to 110-dB performance. No other audio ADCs on the market can achieve a performance level of 110 dB with a single 3.3-V power supply.
- Improves signal-to-noise ratio (SNR):
With direct, high-voltage 2.1-VRMS support, the devices optimize audio quality and allow for a higher SNR. Additionally, the software-controlled devices' automatic clipping-suppression feature helps designers optimize input sensitivity for maximum SNR.
- Reduces system complexity:
The new audio ADCs can 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 4.2-VRMS differential inputs. Designers can easily configure single-ended and differential inputs to cancel hum and ground noise.
- Helps meet mandated low-power standby requirements:
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.
- Small size for space-constrained applications:
Available in 7.8-mm by 4.4-mm TSSOP packages, the devices are up to 45 percent smaller than competing devices.
Tools and support to jump-start designs
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 US$149.
Support is available in the TI E2ETM Community Audio Converters forum, where engineers can search for solutions, get help, share knowledge and solve problems with fellow engineers and TI experts.
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| PCM1860 Evaluation Module Board. |
Package, availability and pricing
Each device in the PCM1865 family comes in a 30-pin TSSOP package. Information on individual devices is located below.
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| *Prices listed are for 1,000-unit quantities. |
